CA2608849A1 - Method and system to control respiration by means of simulated action potential signals - Google Patents
Method and system to control respiration by means of simulated action potential signals Download PDFInfo
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- CA2608849A1 CA2608849A1 CA002608849A CA2608849A CA2608849A1 CA 2608849 A1 CA2608849 A1 CA 2608849A1 CA 002608849 A CA002608849 A CA 002608849A CA 2608849 A CA2608849 A CA 2608849A CA 2608849 A1 CA2608849 A1 CA 2608849A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/3601—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation of respiratory organs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
- A61N1/3606—Implantable neurostimulators for stimulating central or peripheral nerve system adapted for a particular treatment
- A61N1/3611—Respiration control
Abstract
A method to control respiration generally comprising generating and transmitting at least one simulated action potential signal to the body that is recognizable by the respiratory system as modulation signal.
Description
l, ATTORNEY DOCKFT NO: S, 3-006C1P3PCT
Method and System to Control Respiration by Means of Simulated Action Potential Signals s CROSS-REFERENCE TO REI,ATLll APPLiCATIONS
This apptication is a continuation-in-part of U.S. Application No. 11/129,264, filed May 13, 2005, wliich is a continuation-in-part of U.S. Application No.
10/847,738, now U.S. Patent No. 6,937,903, wliich claims the benefit of U.S. Provisional Application No.
60/471,104, tiled May 16, 2003.
i0 FIELD OF TNE PRESENT TNVENTION
The present invention relates generally to ntedical methods and systems for monitorinh and controlling respiration. More particularly, the invention relates to a method and system for controlling respiration by nieans of simulated action potential 1s signals.
BACKGROUND OF TI-11; INVENTION
As is weil lalown in the art, the brain modulates (or controls) respiration via electrical signals (i.e., action potentials or waveform signals), which are transmitted 20 through the nervous system. The nervous system includes two components: the central nervous system, which comprises the brain and the spinal cord, and the peripheral nervous system, which generally comprises groups of nerve cells (i.e., neurons) and peripheral nerves that lie outside the brain and spinal cord. The two systems are anatomically separate, but functionally interconnected.
As indicated, the peripheral nervous system is constructed of nerve cells (or neurons) and glial cells (or glia), which support the neurons. Operative neuron units that carry signals from the brain are referred to as "efferent" nerves. "Afferent"
nerves are those that carry sensor or status information to the brain.
As is known in the art, a typical neuron includes four morphologically defined regions: (i) cell body, (ii) dendrites, (iii) axon ancl (iv) pi-esynaptic ierminals. The cell body (soma) is the metabolic center of the ccll_ The cell body contains the nucleus, I
R7'TORNEY DOCKET No- S 3-006CIP3PCr wliicti stores the genes of the cell, and the rough and smooth endoplasmic reticulunt, which synthesizes the proteins of the cetl.
The cell body typically includes two types of outgrowths (or processes); the ~ dendrites and the axon_ Most neurons have several dendrites; these branch out in tree-like fasliion and serve as the main apparatus for receiving signals froni other nerve cells.
The axon is the main conductinu, unit of the neuron. The axon is capable of conveying electrical signals along distances that range from as short as 0.1 mni to as io long as 2 m. Many axons split into several branches, thereby conveying information to different targets.
Near the end of the axon, the axon is divided into fine branches that malce contact with other neurons. The point of contact is reierred to as a synapse. The cell 1s transmitting a signal is called the presynaptic cell and the cell receiving the signal is referred to as the postsynaptic cell. Specialized swellings on the axon's branches (i.e., presynaptic terminals) serve as the transmitting site in the presynaptic cell.
Most axons terminate near a postsynaptic neuron's dendrites. However, 20 communication can also occur at the cell body or, less often, at the initial segment or terlninal portion of the axon of the postsynaptic cell.
Many nerves and muscles are involved in efficient respiration or breathing.
The most important muscle devoted to respiration is the diaphragm. The diaphragm is a 25 sheet-shaped muscle, which separates the thoracic cavity from the abdominal cavity.
With normal tidal breathing the diaphragm moves about 1 cm. However, in forced breathing, the diaphragm can move up to 10 cm. The left and right phrenic nerves activate diaphragm movement.
Diaphragm contraction and relaxation accounts for approximately 75% volume change in the thorax during normal quiet breathing. Contraction of the diaphragm occurs during inspiration. Expiration occurs when the diaphragm relaxes and recoils to ATTORNEY DOC)CET NO: 03-006CIP3PCT
its resting position. All movements of the diaphragm and related muscles and structures are controlled bv coded electrical signals traveling from the brain.
Details of the respiratory system and related muscle structures are set forth in Co-; Pendina Application No. 10/847,738, which is expressly incorporated by reference herein in its entirety.
The main nerves that are involved in respiration are tl)e ninth and tenth cranial nerves, the phrenic nerve, and the intercostal nerves. The glossopharyngeal nerve tiu (cranial nerve IX) inne,-vates the carotid body and senses CO2 levels in the blood. The vagus nerve (ci-anial nerve X) provides sensory input fi-oni the larynx, pharynx, and thoracic viscera, inctuding the bronchi. The phrenic nerve arises from spinal nerves C3, C4, and C5 and innervates the diaphragm. The intercostal nerves arise from spinal nerves T7-1 I and innervate the intercostal muscles.
The various afferent sensory neuro-fibers provide information as to how the body should be breathing in response to eveltts outside the body proper.
An important respiratory control is activated by the vagus nerve and its preganglionic nerve fibers, which synapse in ganglia. The gangiia are embedded in the bronchi that are also innervated with sympathetic and parasympathetic activity.
It is well documented that the sympathetic nerve division can have no effect on bronchi or it can dilate the lumen (bore) to allow more air to enter during respiration, which is helpful to asthma patients, while the parasympathetic process offers the opposite effect and can constrict the bronchi and increase secretions, which can be harmful to asthma patients.
The electrical signals transmitted along the axon to control respiration, referred to as action potentials, are rapid and transient "all-or-none" nerve impulses.
Action potentials typically have an amplitude of approxiinately 100 rnillivolts (mV) and a duration of approximately I msec. Action potentials are conducted along the axon, without failure or distortion, at rates in the range of approximately 1- 100 meters/sec.
Method and System to Control Respiration by Means of Simulated Action Potential Signals s CROSS-REFERENCE TO REI,ATLll APPLiCATIONS
This apptication is a continuation-in-part of U.S. Application No. 11/129,264, filed May 13, 2005, wliich is a continuation-in-part of U.S. Application No.
10/847,738, now U.S. Patent No. 6,937,903, wliich claims the benefit of U.S. Provisional Application No.
60/471,104, tiled May 16, 2003.
i0 FIELD OF TNE PRESENT TNVENTION
The present invention relates generally to ntedical methods and systems for monitorinh and controlling respiration. More particularly, the invention relates to a method and system for controlling respiration by nieans of simulated action potential 1s signals.
BACKGROUND OF TI-11; INVENTION
As is weil lalown in the art, the brain modulates (or controls) respiration via electrical signals (i.e., action potentials or waveform signals), which are transmitted 20 through the nervous system. The nervous system includes two components: the central nervous system, which comprises the brain and the spinal cord, and the peripheral nervous system, which generally comprises groups of nerve cells (i.e., neurons) and peripheral nerves that lie outside the brain and spinal cord. The two systems are anatomically separate, but functionally interconnected.
As indicated, the peripheral nervous system is constructed of nerve cells (or neurons) and glial cells (or glia), which support the neurons. Operative neuron units that carry signals from the brain are referred to as "efferent" nerves. "Afferent"
nerves are those that carry sensor or status information to the brain.
As is known in the art, a typical neuron includes four morphologically defined regions: (i) cell body, (ii) dendrites, (iii) axon ancl (iv) pi-esynaptic ierminals. The cell body (soma) is the metabolic center of the ccll_ The cell body contains the nucleus, I
R7'TORNEY DOCKET No- S 3-006CIP3PCr wliicti stores the genes of the cell, and the rough and smooth endoplasmic reticulunt, which synthesizes the proteins of the cetl.
The cell body typically includes two types of outgrowths (or processes); the ~ dendrites and the axon_ Most neurons have several dendrites; these branch out in tree-like fasliion and serve as the main apparatus for receiving signals froni other nerve cells.
The axon is the main conductinu, unit of the neuron. The axon is capable of conveying electrical signals along distances that range from as short as 0.1 mni to as io long as 2 m. Many axons split into several branches, thereby conveying information to different targets.
Near the end of the axon, the axon is divided into fine branches that malce contact with other neurons. The point of contact is reierred to as a synapse. The cell 1s transmitting a signal is called the presynaptic cell and the cell receiving the signal is referred to as the postsynaptic cell. Specialized swellings on the axon's branches (i.e., presynaptic terminals) serve as the transmitting site in the presynaptic cell.
Most axons terminate near a postsynaptic neuron's dendrites. However, 20 communication can also occur at the cell body or, less often, at the initial segment or terlninal portion of the axon of the postsynaptic cell.
Many nerves and muscles are involved in efficient respiration or breathing.
The most important muscle devoted to respiration is the diaphragm. The diaphragm is a 25 sheet-shaped muscle, which separates the thoracic cavity from the abdominal cavity.
With normal tidal breathing the diaphragm moves about 1 cm. However, in forced breathing, the diaphragm can move up to 10 cm. The left and right phrenic nerves activate diaphragm movement.
Diaphragm contraction and relaxation accounts for approximately 75% volume change in the thorax during normal quiet breathing. Contraction of the diaphragm occurs during inspiration. Expiration occurs when the diaphragm relaxes and recoils to ATTORNEY DOC)CET NO: 03-006CIP3PCT
its resting position. All movements of the diaphragm and related muscles and structures are controlled bv coded electrical signals traveling from the brain.
Details of the respiratory system and related muscle structures are set forth in Co-; Pendina Application No. 10/847,738, which is expressly incorporated by reference herein in its entirety.
The main nerves that are involved in respiration are tl)e ninth and tenth cranial nerves, the phrenic nerve, and the intercostal nerves. The glossopharyngeal nerve tiu (cranial nerve IX) inne,-vates the carotid body and senses CO2 levels in the blood. The vagus nerve (ci-anial nerve X) provides sensory input fi-oni the larynx, pharynx, and thoracic viscera, inctuding the bronchi. The phrenic nerve arises from spinal nerves C3, C4, and C5 and innervates the diaphragm. The intercostal nerves arise from spinal nerves T7-1 I and innervate the intercostal muscles.
The various afferent sensory neuro-fibers provide information as to how the body should be breathing in response to eveltts outside the body proper.
An important respiratory control is activated by the vagus nerve and its preganglionic nerve fibers, which synapse in ganglia. The gangiia are embedded in the bronchi that are also innervated with sympathetic and parasympathetic activity.
It is well documented that the sympathetic nerve division can have no effect on bronchi or it can dilate the lumen (bore) to allow more air to enter during respiration, which is helpful to asthma patients, while the parasympathetic process offers the opposite effect and can constrict the bronchi and increase secretions, which can be harmful to asthma patients.
The electrical signals transmitted along the axon to control respiration, referred to as action potentials, are rapid and transient "all-or-none" nerve impulses.
Action potentials typically have an amplitude of approxiinately 100 rnillivolts (mV) and a duration of approximately I msec. Action potentials are conducted along the axon, without failure or distortion, at rates in the range of approximately 1- 100 meters/sec.
ATTORNF.Y DOCKET NO: S )3-006CIP3PCT
The anlplitude of the action potential remains constant throughout the axon, since the impulse is continually regenerated as it traverses the axon.
A"neurosignal" is a composite signal that includes many action potentials. The ncurosignal also includes an instruction set for proper organ function. A
respiratory neurosignal would thus include an instruction set for the diaphragm to pcrform an efficient ventilation, including informatiun regarding frequency, initial muscle tension, deoree (or depth) of muscle movement, etc_ to Neurosignals or "neuro-clectrical coded signals" are thus codes that contain complete sets of information for complete organ ftinction. As set forth in Co-Pending Application No. 11/125,480, filed May 9, 2005, once these neurosignals, which are embodied in tiie "simulated action potential signals" referred to herein have been isolated, recorded, standardized and transmitted to a subject (or patient), a generated nerve-specific instruction (i.e., signal(s)) can be employed to control respiration and, hence, treat a multitude of respiratory system disorders. The noted disorders include, but are not limited to, sleep apnea, asthma, excessive mucus production, acute bronchitis and emphysema.
As is known in the art, sleep apnea is generally defined as a temporary cessation of respiration during sleep. Obstructive sleep apnea is the recurrent occlusion of the upper airways of the respiratory system during slcep. Central sleep apnea occurs when the brain fails to send the appropriate signals to the breathing muscles to initiate respirations during sleep. Those afflicted with sleep apnea experience sleep fragmentation and complete or nearly complete cessation of respiration (or ventilation) during sleep with potentially severe degrees of oxyhemoglobin desaturation.
Studies of the mechanism of collapse of the airway suggest that during some stages of sleep, there is a general relaxation of the muscles that stabilize the upper airway segment. This general relaxation of the muscles is believed to be a factor contributing to sleep apnea_ ATTORNEY DOCKET NO: ' 03-006C1P3PCT
Various apparatus, systems and metliods have been developed, which include an apparatus for or step of recording action potentials or coded electrical neurosignals, to control respiration and treat respiratory disorders, such as s)eep apnea. The signals are, liowever, typically suhjectcd to extensive processing and are subsequently employed to i-egulate a"mechanical" device or systein, such as a ventilator. Illustrative are the systerns disclosed in U.S. Pat. Nos. 6,360,740 and 6,651,652.
In U.S. Pat. No. 6,360,740, a systcni and method for providine respiratory assistance is disclosed. The noted method includes the step of recording "breathing signals", which are generated in the respiratory center of a patient. The "breathing signals" are processed and employed to control a muscle stimulation apparatus or ventilator.
In U.S. Pat. No. 6,651,652, a system and method for treating sleep apnea is disclosed. The noted system includes respiration sensor that is adapted to capture neuro-electrical signals and extract the signal components related to respiration.
The signals are similarly processed and employed to control a ventilator.
A major drawback associated with the systems and methods disclosed in the noted patents, as well as most known systems, is that the control signals that are generated and transmitted are "user determined" and "device determinative". The noted "control signals" arc thus not related to or representative of the signals that are generated in the body and, hence, would not be operative in the control or modulation of the respiratory system if transmitted thereto.
It would thus be desirable to provide a method and system for controlling respiration that includes means for generating and transmitting simulated action potential signals to the body that are operative in the control of the respiratory system.
It is therefore an object of the present invention to provide a method and system for controlling respiration that overcomes the drawbacks associated with prior art methods and systems for control ling respiration.
The anlplitude of the action potential remains constant throughout the axon, since the impulse is continually regenerated as it traverses the axon.
A"neurosignal" is a composite signal that includes many action potentials. The ncurosignal also includes an instruction set for proper organ function. A
respiratory neurosignal would thus include an instruction set for the diaphragm to pcrform an efficient ventilation, including informatiun regarding frequency, initial muscle tension, deoree (or depth) of muscle movement, etc_ to Neurosignals or "neuro-clectrical coded signals" are thus codes that contain complete sets of information for complete organ ftinction. As set forth in Co-Pending Application No. 11/125,480, filed May 9, 2005, once these neurosignals, which are embodied in tiie "simulated action potential signals" referred to herein have been isolated, recorded, standardized and transmitted to a subject (or patient), a generated nerve-specific instruction (i.e., signal(s)) can be employed to control respiration and, hence, treat a multitude of respiratory system disorders. The noted disorders include, but are not limited to, sleep apnea, asthma, excessive mucus production, acute bronchitis and emphysema.
As is known in the art, sleep apnea is generally defined as a temporary cessation of respiration during sleep. Obstructive sleep apnea is the recurrent occlusion of the upper airways of the respiratory system during slcep. Central sleep apnea occurs when the brain fails to send the appropriate signals to the breathing muscles to initiate respirations during sleep. Those afflicted with sleep apnea experience sleep fragmentation and complete or nearly complete cessation of respiration (or ventilation) during sleep with potentially severe degrees of oxyhemoglobin desaturation.
Studies of the mechanism of collapse of the airway suggest that during some stages of sleep, there is a general relaxation of the muscles that stabilize the upper airway segment. This general relaxation of the muscles is believed to be a factor contributing to sleep apnea_ ATTORNEY DOCKET NO: ' 03-006C1P3PCT
Various apparatus, systems and metliods have been developed, which include an apparatus for or step of recording action potentials or coded electrical neurosignals, to control respiration and treat respiratory disorders, such as s)eep apnea. The signals are, liowever, typically suhjectcd to extensive processing and are subsequently employed to i-egulate a"mechanical" device or systein, such as a ventilator. Illustrative are the systerns disclosed in U.S. Pat. Nos. 6,360,740 and 6,651,652.
In U.S. Pat. No. 6,360,740, a systcni and method for providine respiratory assistance is disclosed. The noted method includes the step of recording "breathing signals", which are generated in the respiratory center of a patient. The "breathing signals" are processed and employed to control a muscle stimulation apparatus or ventilator.
In U.S. Pat. No. 6,651,652, a system and method for treating sleep apnea is disclosed. The noted system includes respiration sensor that is adapted to capture neuro-electrical signals and extract the signal components related to respiration.
The signals are similarly processed and employed to control a ventilator.
A major drawback associated with the systems and methods disclosed in the noted patents, as well as most known systems, is that the control signals that are generated and transmitted are "user determined" and "device determinative". The noted "control signals" arc thus not related to or representative of the signals that are generated in the body and, hence, would not be operative in the control or modulation of the respiratory system if transmitted thereto.
It would thus be desirable to provide a method and system for controlling respiration that includes means for generating and transmitting simulated action potential signals to the body that are operative in the control of the respiratory system.
It is therefore an object of the present invention to provide a method and system for controlling respiration that overcomes the drawbacks associated with prior art methods and systems for control ling respiration.
ATTORNEI' DOCKET NO: S 3-006C1P3PCT
It is another object of the present invention to provide a method and system for controllin_ respiration that inciudes means for generating and transmitting simulated action potential signals to the body that are operative in thc control of the respiratory system.
It is another object of the invention to provide a method and system for controlling respiration that includes means for generating and transmitting simulated waveform or respiratory signals that substantially correspond to coded waveform signals that are generated in the body and are operative in the control of respiratory system.
It is another object of the invention to provide a metltod and system for controlling respiration that includes means for recording waveform signals that are generated in the body and operative in the control of respiration.
It is aiiottier object of the invention to provide a method and system for controlling respiration that includes processing means adapted to generate a base-line respiratory signal that is representative of at least one coded waveform signal generated in the body from recorded waveform signals.
It is another object of the invention to provide a method and system for controlling respiration that includes processing means adapted to compare recorded respiratory waveform signals to baseline respiratory signals and generate a respiratory signal as a ftinction of the recorded waveform signal.
It is anotlier object of the invention to provide a method and system for controlling respiration that includes monitoring means for detecting respiration abnormalities.
It is another object of the invention to provide a method and system for controlling respiration that includes a sensor to detect whether a subject is experiencing an apneic event.
It is another object of the present invention to provide a method and system for controllin_ respiration that inciudes means for generating and transmitting simulated action potential signals to the body that are operative in thc control of the respiratory system.
It is another object of the invention to provide a method and system for controlling respiration that includes means for generating and transmitting simulated waveform or respiratory signals that substantially correspond to coded waveform signals that are generated in the body and are operative in the control of respiratory system.
It is another object of the invention to provide a metltod and system for controlling respiration that includes means for recording waveform signals that are generated in the body and operative in the control of respiration.
It is aiiottier object of the invention to provide a method and system for controlling respiration that includes processing means adapted to generate a base-line respiratory signal that is representative of at least one coded waveform signal generated in the body from recorded waveform signals.
It is another object of the invention to provide a method and system for controlling respiration that includes processing means adapted to compare recorded respiratory waveform signals to baseline respiratory signals and generate a respiratory signal as a ftinction of the recorded waveform signal.
It is anotlier object of the invention to provide a method and system for controlling respiration that includes monitoring means for detecting respiration abnormalities.
It is another object of the invention to provide a method and system for controlling respiration that includes a sensor to detect whether a subject is experiencing an apneic event.
AT'rORNE1' DOCKE'I' NO: S 13-006CIP3PCT
It is another objeci of the invention to provide a tnethod and system for controlling respii-ation that can be readily etnployed in the treatment of respiratory system disorders, including sleep apnea, asthma, excessive mucus production, acute bronchitis and esnphysema.
SUMMARY OF T]Ir ]NVEVT]ON
In accoi-dance witli the above objects and those that will be mentioned and will become appai-ent below, the method to control respiration generally comprises (i) generating at least a fi!-st simulated action potential signal that is recognizable by the io respiration system as a modulation signal and (ii) transmitting the first simulated action potential signal to the body to control the respiratory system.
In one cinbodiment of the invention, the simulated action potential signal has a first region having a first positive voltage in the range of approximately 100 -1500 mV for a t s first period of time in the range of approximately 100 - 400 }tsec and a second region having a first ncgative voltage in the range of approximately -50 mV to -750 mV for a second period of time in the range of approximately 200-800 psec.
In a preferred embodiment of the invention, the first positive voltage is 20 approximately 800 mV, the first period of time is approximately 200 sec, the first negative voltage is approximately -400 mV and the second period of time is approximately 400 psec.
In one embodiment of the invention, the simulated action potential signal is 25 transmitted to the subject's nervous system. In another embodiment, the simulated action potential signal is transmitted proximate to a target zone on the neck, head or thorax.
In accordance with a further embodiment of the invention, the method for 30 controlling respiration in a subject generally comprises (i) generating at least a first simulated action potential signal that is recoenizable bv the respiratorv system as a tnodulation signal, (ii) monitoring the respiration status of the subject and providing at least one respiratory system status signal in response to an abnormal ftinction of the .iTTORNEY DOCKET NU: S 3-006C1P3PCr respii-atorv system, (iii) transniitting the first simulated action potential signal to the body in response to a respiratory status signal that is indicative of respiratory distress or a respiratory abnorinality.
BRIEF DESCRIF'TION OF THE DRAWINGS
Furiher features and advantages will become apparent from the following and more particular description of the preferred ernbodiments of the invention, as illustrated in the accompanying drawings, and in which like referenced characters generally refer to the same parts or elements throughout the views, and in which:
FIGURES 1A and IB are illustrations of waveform signals captured from the body that are operative in the control of the respiratory system;
FIGURE 2 is a schematic illustration of one embodiment of a respiratory control system, according to the invention;
FIGURE 3 is a schematic illustration of another embodiment of a respiratory control system, according to the invention;
FIGURE 4 is a schematic illustration of yet another embodiment of a respiratory control system, according to the invention;
FIGURES 5A and 5B are illustrations of simulated waveform signals that have been generated by the process means of the invention;
FIGURE 6 is a schematic illustration of an embodiment of a respiratory control system that can be employed in the treatment of sleep apnea, according to the invention;
and FIGURE 7 is a schematic illustration of one embodiment of a simulated action potential signal that has been generated by the proccss means of the invention.
It is another objeci of the invention to provide a tnethod and system for controlling respii-ation that can be readily etnployed in the treatment of respiratory system disorders, including sleep apnea, asthma, excessive mucus production, acute bronchitis and esnphysema.
SUMMARY OF T]Ir ]NVEVT]ON
In accoi-dance witli the above objects and those that will be mentioned and will become appai-ent below, the method to control respiration generally comprises (i) generating at least a fi!-st simulated action potential signal that is recognizable by the io respiration system as a modulation signal and (ii) transmitting the first simulated action potential signal to the body to control the respiratory system.
In one cinbodiment of the invention, the simulated action potential signal has a first region having a first positive voltage in the range of approximately 100 -1500 mV for a t s first period of time in the range of approximately 100 - 400 }tsec and a second region having a first ncgative voltage in the range of approximately -50 mV to -750 mV for a second period of time in the range of approximately 200-800 psec.
In a preferred embodiment of the invention, the first positive voltage is 20 approximately 800 mV, the first period of time is approximately 200 sec, the first negative voltage is approximately -400 mV and the second period of time is approximately 400 psec.
In one embodiment of the invention, the simulated action potential signal is 25 transmitted to the subject's nervous system. In another embodiment, the simulated action potential signal is transmitted proximate to a target zone on the neck, head or thorax.
In accordance with a further embodiment of the invention, the method for 30 controlling respiration in a subject generally comprises (i) generating at least a first simulated action potential signal that is recoenizable bv the respiratorv system as a tnodulation signal, (ii) monitoring the respiration status of the subject and providing at least one respiratory system status signal in response to an abnormal ftinction of the .iTTORNEY DOCKET NU: S 3-006C1P3PCr respii-atorv system, (iii) transniitting the first simulated action potential signal to the body in response to a respiratory status signal that is indicative of respiratory distress or a respiratory abnorinality.
BRIEF DESCRIF'TION OF THE DRAWINGS
Furiher features and advantages will become apparent from the following and more particular description of the preferred ernbodiments of the invention, as illustrated in the accompanying drawings, and in which like referenced characters generally refer to the same parts or elements throughout the views, and in which:
FIGURES 1A and IB are illustrations of waveform signals captured from the body that are operative in the control of the respiratory system;
FIGURE 2 is a schematic illustration of one embodiment of a respiratory control system, according to the invention;
FIGURE 3 is a schematic illustration of another embodiment of a respiratory control system, according to the invention;
FIGURE 4 is a schematic illustration of yet another embodiment of a respiratory control system, according to the invention;
FIGURES 5A and 5B are illustrations of simulated waveform signals that have been generated by the process means of the invention;
FIGURE 6 is a schematic illustration of an embodiment of a respiratory control system that can be employed in the treatment of sleep apnea, according to the invention;
and FIGURE 7 is a schematic illustration of one embodiment of a simulated action potential signal that has been generated by the proccss means of the invention.
ATTORNEY DOCK~T NO: S 13-006CIP3PCT
DE'I'AlI-ED DESCRIPTION OF THE INVENT1ON
Before describing the present inventiori in detail, ii is to be understood that this invention is not limited to particularly exemplified apparatus, systems, structures or methods as such may, of course, vary. Thus, although a mnnber of apparatus, systems and methods similar ol- equivalent to those describcd herein can be used in the practice of the present invention, the preferred niaterials and methods are described lierein.
It is also to he understood that the terminology used lierein is for the purpose of describing particulai- embodirnents of the invention only and is not intended to be limiting.
ro Unless defined otherwise, all technical and scientific tenns used herein have the same meaning as commonly understood by one having otdinary skill in the art to which the invention pertains.
Further, all publications, patents and patent applications cited herein, whether.rupra or infra, are hereby incorporated by reference in their entirety.
Finally, as used in this specification and the appended clainis, the singular fonns "a, "an" and "the" include plural referents unless the content clearly dictates otherwise. Thus, for example, refcrence to "a waveform signal" includes two or more such signals;
reference to "a respiratory disorder" includes two or more such disorders and the like.
Definitions The term "nervous system", as used herein, means and includes the central nervous systein, including the spinal cord, medulla, pons, cerebellum, midbrain, diencephalon and cerebral hemisphere, and the peripheral nervous system, including the neurons and glia.
The terms "waveform" and "waveform signal", as used herein, mean and include a cornposite electrical signal that is generated in the body and carried by neurons in the body, including neurocodes, neurosignals and components and segments thereof.
The term "simulated waveform signal", as used herein, means an clectrical signal or component thereof that substantially corresponds to a "waveform signal".
DE'I'AlI-ED DESCRIPTION OF THE INVENT1ON
Before describing the present inventiori in detail, ii is to be understood that this invention is not limited to particularly exemplified apparatus, systems, structures or methods as such may, of course, vary. Thus, although a mnnber of apparatus, systems and methods similar ol- equivalent to those describcd herein can be used in the practice of the present invention, the preferred niaterials and methods are described lierein.
It is also to he understood that the terminology used lierein is for the purpose of describing particulai- embodirnents of the invention only and is not intended to be limiting.
ro Unless defined otherwise, all technical and scientific tenns used herein have the same meaning as commonly understood by one having otdinary skill in the art to which the invention pertains.
Further, all publications, patents and patent applications cited herein, whether.rupra or infra, are hereby incorporated by reference in their entirety.
Finally, as used in this specification and the appended clainis, the singular fonns "a, "an" and "the" include plural referents unless the content clearly dictates otherwise. Thus, for example, refcrence to "a waveform signal" includes two or more such signals;
reference to "a respiratory disorder" includes two or more such disorders and the like.
Definitions The term "nervous system", as used herein, means and includes the central nervous systein, including the spinal cord, medulla, pons, cerebellum, midbrain, diencephalon and cerebral hemisphere, and the peripheral nervous system, including the neurons and glia.
The terms "waveform" and "waveform signal", as used herein, mean and include a cornposite electrical signal that is generated in the body and carried by neurons in the body, including neurocodes, neurosignals and components and segments thereof.
The term "simulated waveform signal", as used herein, means an clectrical signal or component thereof that substantially corresponds to a "waveform signal".
ATTORNEY DOCKt=:"l NO: S )3-006C1P3PCT
The tcrm "simulated action potential signal", as used herein, means and includes a signal that exhibits positive voltage (or current) for a first period of time and negativc volta~e for a second period of tin)e. The term "simulated action potential signal" thus includes square wave signals, modified square wave signals and frequency modulated i signals.
The term "signal train", as used herein, means a composite signal having a plurality of signals, st.ich as the "simulated action potential" and "simulated waveform" signals defined above.
to Unless stated otherwise, the simulated action potential signals of the invention are designed and adapted to be transmitted continuously or at set intervals to a subject.
The term "respiration", as used herein, lneans the process of breathing.
ts The term "respiratory system", as used herein, means and includes, without limitation, the organs subserving the function of'respiration, including the diaphragm, lungs, nose, throat, larynx, trachea and bronchi, and the nervous system associated therewith.
The term "target zone", as used herein, means and includes, without limitation, a region of the body proximal to a portion of the nervous system whereon the application of electrical signals can induce the desired neural control without the direct application (or conduction) of the signals to a target nerve.
The terms "patient" and "subject", as used herein, mean and include humans and animals.
The term "plexus", as used hcrein, means and includes a branching or tangle of nerve fibers outside the central nervous system.
The term "gang{ion", as used herein, means and includes a group or groups of nerve cell bodies located outside the central nervous system.
ATTORNEY DOCKET NO: S 3-006CiP3PCr The term "sleep apnea", as used herein, means and includes the temporary cessation of respiration oi- a reduction in the respiration rate.
The terms "respiratory system disorder", "respiratory disorder" and "adverse ~ respiratory event", as used herein, mean and include any dysfimction of the respiratory system that iinpedes the normal respiration process. Such dysfunction can be caused by a multitude of known factors and events, including spinal cord injury and severance.
The present invention substantially reduces or eliminates the disadvantages and drawbacks associated with prior art methods and systems for controlling respiration. In onc embodiment of the invention, the method for controlling respiration in a subject generally comprises generating at least one simulated action potential signal that is recognizable by the subject's respiratory system as a modulation signal and transmitting the simulatcd action potential signal to the subject's body. In a preferred embodiment of Is the invention, the simulated action potential signal is transmitted to the subject's nervous system.
As indicated, neuro-electrical signals related to respiration originate in the respiratory center of the medulla oblongata. These signals can be captured or collected from the respiratory center or along the ncrves carrying the signals to the respiratory musculature. The phrenic nerve has, however, proved particularly suitable for capturing the noted signals.
Methods and systems for capturing coded signals from the phrenic nerve(s), and for storing, processing and transmitting neuro-electrical signals (or coded waveform signals) are set forth in Co-Pending Application Nos. 10/000,005, filed November 20, 2001, and Application No. 111125,480 filed, May 9, 2005; which are incorporated by reference herein in their entirety.
Referring first to Figs. 1A and 1B, there are shown exemplar waveform signals that are operative in the efferent operation of the human (and animal) diaphragm;
Fig. lA
showirig three (3) signals l OA, IOB, I OC, having rest periods 12A, 12B
therebetween, and ATTORNEI' DOCKET NO: F 13-006C:iP3PCT
Fig_ 1 B showing an expanded view of signal lOB. "l'he noted signals traverse the phrenic nerve, wliich runs between the cervical spine and the diaphragm.
As will be appi-eciated by orie having ordinary skill in the art, signals IOA, 1013, IOC
will vary as a function of various factors, such as physical exertion, reaction to changes in the environment, etc_ As will also be appreciated by one having skill in the art, the presence. shape and number of pulses of signal segment 14 can similarly vary from rnuscle (or muscle group) signal-to-signal.
As stated above, the noted signals include coded information related to inspiration, such as frequency, initial muscle tension, degree (or depth) of muscle movement, etc.
ln accordance with one embodiment of the invention, neuro-electrical signals generated in the body that are operative in the control of respiration, such as the signals shown in Figs_ 1A and lb, are captured and transmitted to a processor or control module.
Prefei-ably, the control module includes storage means adapted to store the captured signals. In a preferred embodiment, the control module is further adapted to store the components of the captured signals (that are extracted by the processor) in the storage means according to the function performed by the signal components.
According to the invention, the stored signals can subsequently be employed to establish base-line respiration signals. The module can then be programmed to compare "abnormal" respiration signals (and components thereof) captured from a subject and, as discussed below, generate a simulated waveform signal or modified base-line signal for transmission to the subject. Such modification can include, for example, increasing the amplitude of a respiratory signal, increasing the rate of the signals, etc.
According to the invention, the captured neuro-electrical signals are processed by known means and a simulated waveform signal (i.e., simulated neuro-electrical coded signal) that is representative of at least one captured neuro-electrical signal and is operative in the control of respiration (i.e., recognized by the brain or respiratory system i7.
ATTORNIEYDOCKETNO: f 93-006C1P3PCT
as a modulation signal) is generated by the control module. The noted simulated waveform signal is similarly stored in the storage means of the conti-ol module.
ln one embodiment of the invention, to control respiration, the simulated waveform signal is accessed fi-om thc storage means and transmitted to the subject via a transmitter (or probe).
According to the invention, the applied voltage of the simulated waveform signal can be up to 20 volts to allow for voltage loss during the transmission of the signals.
Preferably, current is maintained to less than 2 ainp output.
Direct conduction into the nerves via electrodes connected directly to such nerves prcferably have outputs iess than 3 volts and current less than one tenth of an amp.
Refcrring now to Fig. 2, there is shown a schematic illustration of one embodiment of a respiratory control system 20A of the invention. As illustrated in Fig. 2, the control system 20A includes a control module 22, which is adapted to receive neuro-electrical coded signals or "waveform signals" from a signal sensor (shown in phantom and designated 21) that is in conimunication with a subject, and at least one treatment member 24.
The treatment member 24 is adapted to communicate with the body and receives the simulated waveform signal (or simulated action potential signal, discussed below) from the control module 22. According to the invention, the treatment member 24 can comprise an electrode, antenna, a seismic transducer, or any other suitable form of conduction attachment for transmitting respiratory signals that regulate or operate breathing function in human or animals.
The treatment member 24 can be attached to appropriate nerves or respiratory organ(s) via a surgical process. Such surgery can, for example, be accomplished with "key-hole" entrance in a thoracic-stereo-scope procedure. If necessary. a more expansive thoracotomy approach can be etnployed for niore proper placement of the treatment member 24.
ATTORNEY DOCKET NO: S 13-006CiP3PCT
Further, if necessary, the treatinent member 24 can be inserted into a body cavity, such as the nose oi- tnouth, and can be positioned to pierce the mucinous or other membranes, whereby the member 24 is placed in close proximity to the medulla oblongata and/or pons. The siniulated signals of the invention can then be sent into ; nei-ves that are in close proximity with the brain stem.
As illustrated in FIG. 2, the control module 22 and treatment member 24 can be cntirely separate eleinents, which allow system 20A to be operated reinotely.
According to the invention, the control module 22 can be unique, i.e., tailored to a specific to operation and/or subject, or can comprise a conventional device.
Referring now to Fig 3, there is shown a further embodiment of a control system 20B of the invention. As illustrated in Fig. 3, the system 20B is similar to system 20A
shown in Fig. 2. However, in this embodiinent, the control module 22 and treatment is member 24 are connected.
Referring now to Fig. 4, there is shown yet another embodiment of a control systein 20C'of the invention. As illustrated in Fig. 4, the control system 20C
similarly includes a control module 22 and a treatment member 24. The systein 20C
further 20 includes at least one signal sensor 21.
The system 20C also includes a processing module (or computer) 26. According to the invention, the processing module 26 can be a separate component or can be a sub-system of a control module 22', as shown in phantom.
As indicated above, the processing module (or control module) preferably includes storage means adapted to store the captured rcspiratory signals. In a preferred embodiment, ttie processing module 26 is further adapted to extract and store the components of the captured respiratory signals in the storage means according to the function performed by the signal components.
ATTOtLNEY DOCKET NO: 03-006C1Y3PCT
According to the invention, in onc embodiment of the invention, the method for controlling respiration in a subject includes generating a first simulated wavef'orm signal that is recognizable by the respiratory system as a modulation signal and (6) transmitting the first simulated wavefnrm signal to the body to control the respiratory system.
;
In another embodimcnt of the invention, the method for controlling respiration cOmprises capturing coded waveform signals that are generated in a subject's body and arc operative in the control of respiration, (ii) generating a first simulated waveform signal that is i-ecognizable by the respiratory system as a modulation signal, and (iii) transmitting io the first simulated wavefonn signal to the body.
In one embodiment of the invention, the first siinulated waveform signal includes at least a second simulated waveform signal that stibstantially corresponds to at least one of the captured wavefoi-m signals and is operative in the control of the respiratory system.
In one embodiment of the invention, the first simulated waveform signal is transmitted to the subject's nervous system. In another embodiment, the first simulated waveform signal is transmitted proxiinate to a target zone on the neck, head or thorax.
According to the invention, the simulated waveform signals can be adjusted (or modulated), if necessary, prior to transmission to the subject.
In another embodirnent of the invention, the method to control respiration generally comprises (i) capturing coded waveform signals that are generated in the body and are operative in control of respiration and (ii) storing the captured waveform signals in a storage medium, the storage medium being adapted to store the components of the captured waveform signals according to the function performed by the signal components, (iii) generating a first simulated waveform signal that substantially corresponds to at least one of the captured waveform signals, and (iv) transmitting the first simulated waveform signal to the body to the control the respiratory system.
In another cmbodiment of the invention, the mcthod to control respiration generally coinprises (i) capturing a first pluraliry of waveform signals generated in a first subject's ATTORNEY DOCKET NO: 5 )3-006CIP3PCT
body that are operative in the control of respiration, (ii) generating a base-line respiration wavefonn signal from the first plurality of waveform signals, (iii) capturing a second waveform swnal generated in the first subject's body that is operative in the control of respiration. (iv) comparing the base-line waveform signal to the second waveform si-Inal.
(v) generating a third wavefoi-m signal based on the comparison of the base-line and second waveforlTt signals, and (vi) transmitting the third waveform signal to the body, the third waveform signal being operative in the conti-ol of respiration.
In one embodinient of the invention, tlie fil-st plurality of waveform signals is captut-ed fi-om a plurality of subjects.
Irl one elnbodiment of the invention, the step of transmitting the waveform signals to the subject's body is accomplished by direct conduction or transmission through unbroken skin at a selected appropriate zone on the neck, head, or thorax.
Such zone will approximate a position close to the nerve or nerve plexus onto which the signal is to be imposed.
In an alternate embodiment of the invention, the step of transmitting the wavcform signals to the subject's body is accomplished by direct conduction via attachment of an electrode to the receiving nerve or nerve plexus. This requires a surgical intervention to physically attach the electrode to the selectcd target nerve.
In yet another embodiment of the invention, the step of transmitting a signal to the subject's body is accomplished by transposing the signal into a seismic form.
The seismic signal is then sent into a region of the head, neck, or thorax in a manner that allows the appl-opriate "nerve" to receive and obey the coded instructions of the seismic signal.
Referring now to Figs. 5A and 5B, there are sltown simulated waveform signals 190, 191 that were generated by the apparatus and methods of the invention.
The noted signals are rnerely representative of the simulated waveform signals that can be generated by the apparatus and methods of the invention and should not be interpreted as limiting the scope of the invention in any way.
ATTORNEY DOCKET NO: : )3-006C1P3PCT
Refelring first to Fig. 5A_ there is shown the exemplar phrenic simulated waveform signal 190 showing only the positive lialf of the transmitted signal. The si<nal 190 comprises only two segments, the initial segment 192 and the spike segnient 193.
~ Referring now to Fig. 5B, there is shown the exemplar phrenic simulated waveform si gnal 191 that has been fully modulated at 500 Hz. The signal 191 includes the same two segments, the initial segment 194 and the spike segment 195.
Referring now to Fig. 7. there is shown one embodiinent of a simulated action potential signal 200 of the invention. As discaissed in detail below, the simulated action potential signal 200 has beeri successfully employed to control respiration.
As illustrated in Fig. 7, the simulated action potential signal 200 comprises a modified, substantially square wave signal. According to the invention, the simulated action potential signal 200 includes a positive voltage region 202 having a first positive voltage (Vf) for a first period of time (Ti) and a first negative region 204 having a first negative voltage (VZ) for a second period of time (T2).
Preferably, the first positive voltage (Vf) is in the rangc of approximately, mV, more preferably, in the range of approximately 700 - 900 mV, cven more preferably, approximately 800 mV; the first period of time (TI) is in the range of approximately 100 -400 psec, more preferably, in the range of approximately 150 - 300 sec, even more preferably, approximately 200 sec; the first negative voltage (VZ) is in the range of approximately, -50 mV to -750 mV, more preferably, in the range of approximately -350 mV to -450 mV, even more preferably, approximately -400 mV; the second period of time (T2) is in the range of approximately 200 - 800 sec, more preferably, in the range of approximately 300 - 600 sec, even more preferably, approximately 400 sec.
The simulated action potential signal 200 thus comprises a eontinuous sequence of positive and negative substantially square waves of voltage (or current) or bursts of positive and negative substantially sqt+are waves of voltaae (or current), which preferably exhibits a DC component signal substantially equal to zero.
ATTORIVEY DOCKt:T NO: S 3-006C1P3PCT
1'rcferably, the simulated action potential signal 200 lias a repetition rate in the range of approximately 0.5 - 4 KHz, more preferably, in the rance of approximately 1-2 Kliz.
Even moi-e preferably, the repetition rate is approximately 1.6 Kllz.
In a prefei-red embodiment of the inventirni, the maxiinum amplitude of the simulated action potential signal 200 is approximately 200 mV. As will be appreciated by one having ordinary skill in the art, the effectivc amplitude for the applied voltage is a strong ftinction of several factors, including the electrode employed, the placement of the electrode and the pi-eparation of the nerve.
According to the inveniion, the simulated action potential signals of the invention can be cmployed to construct "signal trains", comprising a plurality of simulated action potential signals. The signal train can comprise a continuous train of simulated action potential signals or can included interposed signals or rest periods, i.e., zero voltage and current, between one or more simulated action potential signals.
The signal train can also comprise substantially similar simulated action potential signals, different simulated action potential signals or a combination thereof. According to the invention, the different simulated action potential signals can have different first positive voltage (V I) and/or first period of time (TI) and/or first negative voltage (V2) and/or second period of time (T2).
In accordance with one embodiment of the invention, the method for controlling respiration in a subject thus includes generating a first simulated action potential signal that is recognizable by the respiratory system as a modulation signal and (ii) transmitting the first simulated action potential signal to the body to control the respiratory systetn.
In one embodiment of the invention, the first simulated action potential signal is ti-ansrnitled to the subject's nervous system. In another embodiment, the first simulated action potential signal is transmitted proximate to a target zone on the neck, head or thorax.
ta .aTTORNEY DOCKET NO: S )3-006C1P3PCT
In accordance witli a furtliel- etnbodiment of the invention, the niethod for controlling respiration in a subject includes generating a first signal train, said signal train including a plurality of simulatcd action potential signals that are recognizable by the respiratory system as modulation signals and (ii) transmitting the first signal train to the ~ body to conu-ol the respiratory system.
According to the invention, the control of respiration can, in sonie instances, require senciing sinlulated waveform and action potential signals into one or more nel-ves, ir~cluding up to five nerves silnultaneously, to control respiration rates and depth of lo inhalation- For exarnple, the corl-ection of asthma or other breathing impairment or disease involves the rhythmic operation of the diaphragm and/or the intercostal muscles to inspire and expire air for the extraction of oxygen and the dumping of waste gaseous compounds, such as carbon dioxide.
15 As is known in the art, opening (dilation) the bronchial tubular network allows for inore air volume to be exchanged and processed for its oxygen content within the lungs.
"f'he dilation process can be controlled by transmission of the signals of the invention. The bronchi can also be closed down to restrict air volume passage into the lungs.
A balance uf controlling nerves for dilation and/or constriction can thus be accomplished through the 20 methods and apparatus of the invention.
Purther, mucus production, if excessive, can fonn mucoid plugs that restrict air volume flow throughout the bronchi. As is known in the art, no mucus is produced by the lung except in the lumen of the bronchi and also in the trachea.
The noted mucus production can, however, be increased or dccreased by transtnission of the signals of the invention. The transmission of the aforementioned signals of the invention can thus balance the quality and quantity of the mucus.
The present invention thus provides methods and apparatus to effectively control respiration rates and strength, along with bronchial tube dilation and mucinous action in the bronchi, by generating and transmitting simulated waveform and actiorl potential signals to the body. Such ability to opcn bronchi will be useful for eniergency roonl ATTOANIE1' DOCICET NO: ' 33-006C1P3PCT
treatment of acute bronchitis or smoke inhalation injuries. Chronic airway obstructive disorders, such as emphysema, can also be addressed.
Acute fire or chemical inlialation injury trcauiient can also be enhanced through the s methods and apparatus of the invention, while using mechanical respiration support.
lnjut-y-mediated mucus secretions also lead to obstruction of the airways and are refractory to ttrgent treatment, posing a life-threatening risk. Edema (swelling) inside the trachea or bronchial tubes tends to limit bore size and cause oxygen starvation. The ability to open bore size is essential or at least desirable during treatment.
to Fui-ttier, the effort of breathing in patients with pneumonia may be eased by tnodulated activation of the phrenic nerve through the methods and apparatus of the invention_ Treatment of numerous other life threatening conditions also revolves around a well functioning i-espiratory system. Therefore, the invention provides the physician with 15 a method to open bronchi and fiiie tune the breathing rate to improve oxygenation of patients. This electronic treatment method (in one embodiment) encompasses the transmission of activating or suppressing simulated action potential signals onto selected nerves to improve respiration. According to the invention, such treatments could be augmented by oxygen administration and the use of respiratory medications, which are 20 presently available.
The methods and apparatus of the invention can also be effectively employed in the treatment of obstructive sleep apnea (or central sleep apnea) and other respiratory ailments. Referring now to Fig. 6, there is shown one embodiment of a respiratory control 25 system 30 that can be employed in the treatment of sleep apnea. As illustrated in Fig. 6, the system 30 includes at least one respiration sensor 32 that is adapted to monitor the respiration status of a subject and transmit at least one signal indicative of the respiratory status.
30 According to the invention, the respiration status (and, hence, a sleep disorder) can be determined by a multitude of factors, including diaphragm movement, respiration rate, levels of 02 and/or CO2 in the blood, muscle tension in the neck, air passage (or lack thereof) in the air passages of the throat or lungs, i.e., ventilation.
Various sensors can AT'rORNEY DOCKET NO: S i3-006CIP3PCT
thus be ernployed within the scope of the invention to detect the noted factors and, hence, the onset of a respiratory disorder.
The system 30 further includes a processor 36, which is adapted to receive the respiratory system status signal(s) from the respiratory sensor 32. The processor 36 is fui-ther adapted to receive coded waveform signals recorded by a respiratory sib ial probe (shown in phantom and designated 34).
In a preferred embodiment of the invention, the processor 36 includes storage t0 rneans for storing the captui-ed, coded waveform signals and respiratory system status signals. The processoi- 36 is further adapted to extract the components of the waveform signals and store the signal components in the storage means.
In a preferred embodiment, the processor 36 is programmed to detect respiratory t s system status signals indicative of respiration abnormalities and/or wavefonn signal components indicative of respiratory system distress and generate at least one simulated waveform signal or simulated action potential signal that is operative in the control of respiration.
20 Referring to Fig. 6, the simulated wavefonn signal or simulated action potential signal is routed to a trans3nitter 38 tttat is adapted to be in communication with the subject's body. The transmitter 38 is adapted to transmit the simulated wavefonn signal or simulated action potential signal to the stibject's body (in a similar manner as described above) to control and, preferably, remedy the detected respiration abnormality.
According to the invention, the simulated waveform signal or si-nulated action potential signal is preferably transmitted to the phrenic nerve to contract the diaphragm, to the hypoglossal nerve to tighten the throat muscles and/or to the vagus nerve to maintain noi-,nal brainwave patterns. A single signal or a plurality of signals can be transmitted in conjunction with one another.
.aTTORNF:Y llOCKFT NO: S )3-006CIP3PCT
Thus, in accordance with a fiirther embodirnent of the invention, the method for controlling >-espiration in a subject generally comprises (i) Cenerating at least a first simulated action potential signal that is recognizable by the respiratory systern as a modulation si -nal, (ii) monitoring the respiration status of the subject and providing at least one respiratory system status signal in response to an abnormal function of the respiratory svstem, (iii) transmitting the simulated action potential signal to the body to control the respiration system in response to a respiration status signal that is indicative of respiratory distress or a respiratory abnormality.
EXAMPLES
The following examples are provided to enable those skilled in the art to more clearly understand and practice the present invention. They should not be considered as limiting the scope of the invention, but met-ely as being illustrated as representative thereof.
is Example 1 Four (4) juvenile swine, ranging in weight from 40 to 80 lbs., were exposed to nebulized inethacholine that was dissolved in saline. Ventilation parameters, arterial oxygen saturation and exhaled carbon dioxide were tnonitored at various concentrations of methacholine.
The vagus nerve of the swine was exposed in the neck. As reflected in Table 1, three signals were employed. Signal I comprised a sinusoidal signal having 500 Hz at 800 tnV. Signal 2 comprised a simulated action potential signal having a 400 psec, 800 mV positive voltage region and a 800 psec, -400 mV negative voltage region.
Signal 3 comprised a simulated action potential signal having a 200 sec, 800 mV
positive voltage region and a 400 sec, -400 mV negative voltage region.
.;'1 I'URNEY DOCICE'r Np: S 13-006CJP3PCT
Table I
,.- -- -- _ Parameter Methacholine Signal 1 Signal 2 Signal 3 lnereased No T:ffect No Effect Decreased Tidal Volnme _ --- ------- ---- - -Decreased Deci-eased Decreased Greatly l.espiration Rate Decreased Inci-eased Decreased Decreased Greatly Inspiratory llccrcased Pi-essure Yes, 20 Yes, Yes, No, no Manual seconds to increased increased adverse cffect d L Ventilation reeover recovery recovery time observed required time Referring to Table l, it can be seen that, upon administration of inetliacholine and transmittal of the noted signals, there was a marked reduction in respiratory rate and effort, which were similar to baseline levels without administration of methacholine.
There was also a marked reduction in oxygen saturation and exhaled CO2.
It was further found that when a simulated action potential signal having a first positive voltage of 800 mV for 200 sec and a first negative voltage of approximately -400 mV for approximately 400 lisec was applied to the swine, a reduction in sensitivity to methacholine of at least a factor of 2, and as much as a factor of 8, was realized.
The example thus reflects that a modified square wave signal can be applied to the vagus nerve to dramatically reduce the physiologic response to drugs that produce asthma symptoms. As will be appreciated by one having ordinary skill in the art, the simulated action potential signals of the invention can thus be effectively employed to mitigate the normal human response to asthma triggers, reduce the severity of asthma attacks and permit delivery of anti-inflammatory medication for better control of asthma symptoms during acute attacks.
Without departing from the spirit and scope of this invention, one of ordinary skill can make various changes and modifications to the invention to adapt it to various usages and conditions. As such, these chanGes and modifications are properly, equitably, and intended to be, within the full range of equivalence of the fallowing claims.
The tcrm "simulated action potential signal", as used herein, means and includes a signal that exhibits positive voltage (or current) for a first period of time and negativc volta~e for a second period of tin)e. The term "simulated action potential signal" thus includes square wave signals, modified square wave signals and frequency modulated i signals.
The term "signal train", as used herein, means a composite signal having a plurality of signals, st.ich as the "simulated action potential" and "simulated waveform" signals defined above.
to Unless stated otherwise, the simulated action potential signals of the invention are designed and adapted to be transmitted continuously or at set intervals to a subject.
The term "respiration", as used herein, lneans the process of breathing.
ts The term "respiratory system", as used herein, means and includes, without limitation, the organs subserving the function of'respiration, including the diaphragm, lungs, nose, throat, larynx, trachea and bronchi, and the nervous system associated therewith.
The term "target zone", as used herein, means and includes, without limitation, a region of the body proximal to a portion of the nervous system whereon the application of electrical signals can induce the desired neural control without the direct application (or conduction) of the signals to a target nerve.
The terms "patient" and "subject", as used herein, mean and include humans and animals.
The term "plexus", as used hcrein, means and includes a branching or tangle of nerve fibers outside the central nervous system.
The term "gang{ion", as used herein, means and includes a group or groups of nerve cell bodies located outside the central nervous system.
ATTORNEY DOCKET NO: S 3-006CiP3PCr The term "sleep apnea", as used herein, means and includes the temporary cessation of respiration oi- a reduction in the respiration rate.
The terms "respiratory system disorder", "respiratory disorder" and "adverse ~ respiratory event", as used herein, mean and include any dysfimction of the respiratory system that iinpedes the normal respiration process. Such dysfunction can be caused by a multitude of known factors and events, including spinal cord injury and severance.
The present invention substantially reduces or eliminates the disadvantages and drawbacks associated with prior art methods and systems for controlling respiration. In onc embodiment of the invention, the method for controlling respiration in a subject generally comprises generating at least one simulated action potential signal that is recognizable by the subject's respiratory system as a modulation signal and transmitting the simulatcd action potential signal to the subject's body. In a preferred embodiment of Is the invention, the simulated action potential signal is transmitted to the subject's nervous system.
As indicated, neuro-electrical signals related to respiration originate in the respiratory center of the medulla oblongata. These signals can be captured or collected from the respiratory center or along the ncrves carrying the signals to the respiratory musculature. The phrenic nerve has, however, proved particularly suitable for capturing the noted signals.
Methods and systems for capturing coded signals from the phrenic nerve(s), and for storing, processing and transmitting neuro-electrical signals (or coded waveform signals) are set forth in Co-Pending Application Nos. 10/000,005, filed November 20, 2001, and Application No. 111125,480 filed, May 9, 2005; which are incorporated by reference herein in their entirety.
Referring first to Figs. 1A and 1B, there are shown exemplar waveform signals that are operative in the efferent operation of the human (and animal) diaphragm;
Fig. lA
showirig three (3) signals l OA, IOB, I OC, having rest periods 12A, 12B
therebetween, and ATTORNEI' DOCKET NO: F 13-006C:iP3PCT
Fig_ 1 B showing an expanded view of signal lOB. "l'he noted signals traverse the phrenic nerve, wliich runs between the cervical spine and the diaphragm.
As will be appi-eciated by orie having ordinary skill in the art, signals IOA, 1013, IOC
will vary as a function of various factors, such as physical exertion, reaction to changes in the environment, etc_ As will also be appreciated by one having skill in the art, the presence. shape and number of pulses of signal segment 14 can similarly vary from rnuscle (or muscle group) signal-to-signal.
As stated above, the noted signals include coded information related to inspiration, such as frequency, initial muscle tension, degree (or depth) of muscle movement, etc.
ln accordance with one embodiment of the invention, neuro-electrical signals generated in the body that are operative in the control of respiration, such as the signals shown in Figs_ 1A and lb, are captured and transmitted to a processor or control module.
Prefei-ably, the control module includes storage means adapted to store the captured signals. In a preferred embodiment, the control module is further adapted to store the components of the captured signals (that are extracted by the processor) in the storage means according to the function performed by the signal components.
According to the invention, the stored signals can subsequently be employed to establish base-line respiration signals. The module can then be programmed to compare "abnormal" respiration signals (and components thereof) captured from a subject and, as discussed below, generate a simulated waveform signal or modified base-line signal for transmission to the subject. Such modification can include, for example, increasing the amplitude of a respiratory signal, increasing the rate of the signals, etc.
According to the invention, the captured neuro-electrical signals are processed by known means and a simulated waveform signal (i.e., simulated neuro-electrical coded signal) that is representative of at least one captured neuro-electrical signal and is operative in the control of respiration (i.e., recognized by the brain or respiratory system i7.
ATTORNIEYDOCKETNO: f 93-006C1P3PCT
as a modulation signal) is generated by the control module. The noted simulated waveform signal is similarly stored in the storage means of the conti-ol module.
ln one embodiment of the invention, to control respiration, the simulated waveform signal is accessed fi-om thc storage means and transmitted to the subject via a transmitter (or probe).
According to the invention, the applied voltage of the simulated waveform signal can be up to 20 volts to allow for voltage loss during the transmission of the signals.
Preferably, current is maintained to less than 2 ainp output.
Direct conduction into the nerves via electrodes connected directly to such nerves prcferably have outputs iess than 3 volts and current less than one tenth of an amp.
Refcrring now to Fig. 2, there is shown a schematic illustration of one embodiment of a respiratory control system 20A of the invention. As illustrated in Fig. 2, the control system 20A includes a control module 22, which is adapted to receive neuro-electrical coded signals or "waveform signals" from a signal sensor (shown in phantom and designated 21) that is in conimunication with a subject, and at least one treatment member 24.
The treatment member 24 is adapted to communicate with the body and receives the simulated waveform signal (or simulated action potential signal, discussed below) from the control module 22. According to the invention, the treatment member 24 can comprise an electrode, antenna, a seismic transducer, or any other suitable form of conduction attachment for transmitting respiratory signals that regulate or operate breathing function in human or animals.
The treatment member 24 can be attached to appropriate nerves or respiratory organ(s) via a surgical process. Such surgery can, for example, be accomplished with "key-hole" entrance in a thoracic-stereo-scope procedure. If necessary. a more expansive thoracotomy approach can be etnployed for niore proper placement of the treatment member 24.
ATTORNEY DOCKET NO: S 13-006CiP3PCT
Further, if necessary, the treatinent member 24 can be inserted into a body cavity, such as the nose oi- tnouth, and can be positioned to pierce the mucinous or other membranes, whereby the member 24 is placed in close proximity to the medulla oblongata and/or pons. The siniulated signals of the invention can then be sent into ; nei-ves that are in close proximity with the brain stem.
As illustrated in FIG. 2, the control module 22 and treatment member 24 can be cntirely separate eleinents, which allow system 20A to be operated reinotely.
According to the invention, the control module 22 can be unique, i.e., tailored to a specific to operation and/or subject, or can comprise a conventional device.
Referring now to Fig 3, there is shown a further embodiment of a control system 20B of the invention. As illustrated in Fig. 3, the system 20B is similar to system 20A
shown in Fig. 2. However, in this embodiinent, the control module 22 and treatment is member 24 are connected.
Referring now to Fig. 4, there is shown yet another embodiment of a control systein 20C'of the invention. As illustrated in Fig. 4, the control system 20C
similarly includes a control module 22 and a treatment member 24. The systein 20C
further 20 includes at least one signal sensor 21.
The system 20C also includes a processing module (or computer) 26. According to the invention, the processing module 26 can be a separate component or can be a sub-system of a control module 22', as shown in phantom.
As indicated above, the processing module (or control module) preferably includes storage means adapted to store the captured rcspiratory signals. In a preferred embodiment, ttie processing module 26 is further adapted to extract and store the components of the captured respiratory signals in the storage means according to the function performed by the signal components.
ATTOtLNEY DOCKET NO: 03-006C1Y3PCT
According to the invention, in onc embodiment of the invention, the method for controlling respiration in a subject includes generating a first simulated wavef'orm signal that is recognizable by the respiratory system as a modulation signal and (6) transmitting the first simulated wavefnrm signal to the body to control the respiratory system.
;
In another embodimcnt of the invention, the method for controlling respiration cOmprises capturing coded waveform signals that are generated in a subject's body and arc operative in the control of respiration, (ii) generating a first simulated waveform signal that is i-ecognizable by the respiratory system as a modulation signal, and (iii) transmitting io the first simulated wavefonn signal to the body.
In one embodiment of the invention, the first siinulated waveform signal includes at least a second simulated waveform signal that stibstantially corresponds to at least one of the captured wavefoi-m signals and is operative in the control of the respiratory system.
In one embodiment of the invention, the first simulated waveform signal is transmitted to the subject's nervous system. In another embodiment, the first simulated waveform signal is transmitted proxiinate to a target zone on the neck, head or thorax.
According to the invention, the simulated waveform signals can be adjusted (or modulated), if necessary, prior to transmission to the subject.
In another embodirnent of the invention, the method to control respiration generally comprises (i) capturing coded waveform signals that are generated in the body and are operative in control of respiration and (ii) storing the captured waveform signals in a storage medium, the storage medium being adapted to store the components of the captured waveform signals according to the function performed by the signal components, (iii) generating a first simulated waveform signal that substantially corresponds to at least one of the captured waveform signals, and (iv) transmitting the first simulated waveform signal to the body to the control the respiratory system.
In another cmbodiment of the invention, the mcthod to control respiration generally coinprises (i) capturing a first pluraliry of waveform signals generated in a first subject's ATTORNEY DOCKET NO: 5 )3-006CIP3PCT
body that are operative in the control of respiration, (ii) generating a base-line respiration wavefonn signal from the first plurality of waveform signals, (iii) capturing a second waveform swnal generated in the first subject's body that is operative in the control of respiration. (iv) comparing the base-line waveform signal to the second waveform si-Inal.
(v) generating a third wavefoi-m signal based on the comparison of the base-line and second waveforlTt signals, and (vi) transmitting the third waveform signal to the body, the third waveform signal being operative in the conti-ol of respiration.
In one embodinient of the invention, tlie fil-st plurality of waveform signals is captut-ed fi-om a plurality of subjects.
Irl one elnbodiment of the invention, the step of transmitting the waveform signals to the subject's body is accomplished by direct conduction or transmission through unbroken skin at a selected appropriate zone on the neck, head, or thorax.
Such zone will approximate a position close to the nerve or nerve plexus onto which the signal is to be imposed.
In an alternate embodiment of the invention, the step of transmitting the wavcform signals to the subject's body is accomplished by direct conduction via attachment of an electrode to the receiving nerve or nerve plexus. This requires a surgical intervention to physically attach the electrode to the selectcd target nerve.
In yet another embodiment of the invention, the step of transmitting a signal to the subject's body is accomplished by transposing the signal into a seismic form.
The seismic signal is then sent into a region of the head, neck, or thorax in a manner that allows the appl-opriate "nerve" to receive and obey the coded instructions of the seismic signal.
Referring now to Figs. 5A and 5B, there are sltown simulated waveform signals 190, 191 that were generated by the apparatus and methods of the invention.
The noted signals are rnerely representative of the simulated waveform signals that can be generated by the apparatus and methods of the invention and should not be interpreted as limiting the scope of the invention in any way.
ATTORNEY DOCKET NO: : )3-006C1P3PCT
Refelring first to Fig. 5A_ there is shown the exemplar phrenic simulated waveform signal 190 showing only the positive lialf of the transmitted signal. The si<nal 190 comprises only two segments, the initial segment 192 and the spike segnient 193.
~ Referring now to Fig. 5B, there is shown the exemplar phrenic simulated waveform si gnal 191 that has been fully modulated at 500 Hz. The signal 191 includes the same two segments, the initial segment 194 and the spike segment 195.
Referring now to Fig. 7. there is shown one embodiinent of a simulated action potential signal 200 of the invention. As discaissed in detail below, the simulated action potential signal 200 has beeri successfully employed to control respiration.
As illustrated in Fig. 7, the simulated action potential signal 200 comprises a modified, substantially square wave signal. According to the invention, the simulated action potential signal 200 includes a positive voltage region 202 having a first positive voltage (Vf) for a first period of time (Ti) and a first negative region 204 having a first negative voltage (VZ) for a second period of time (T2).
Preferably, the first positive voltage (Vf) is in the rangc of approximately, mV, more preferably, in the range of approximately 700 - 900 mV, cven more preferably, approximately 800 mV; the first period of time (TI) is in the range of approximately 100 -400 psec, more preferably, in the range of approximately 150 - 300 sec, even more preferably, approximately 200 sec; the first negative voltage (VZ) is in the range of approximately, -50 mV to -750 mV, more preferably, in the range of approximately -350 mV to -450 mV, even more preferably, approximately -400 mV; the second period of time (T2) is in the range of approximately 200 - 800 sec, more preferably, in the range of approximately 300 - 600 sec, even more preferably, approximately 400 sec.
The simulated action potential signal 200 thus comprises a eontinuous sequence of positive and negative substantially square waves of voltage (or current) or bursts of positive and negative substantially sqt+are waves of voltaae (or current), which preferably exhibits a DC component signal substantially equal to zero.
ATTORIVEY DOCKt:T NO: S 3-006C1P3PCT
1'rcferably, the simulated action potential signal 200 lias a repetition rate in the range of approximately 0.5 - 4 KHz, more preferably, in the rance of approximately 1-2 Kliz.
Even moi-e preferably, the repetition rate is approximately 1.6 Kllz.
In a prefei-red embodiment of the inventirni, the maxiinum amplitude of the simulated action potential signal 200 is approximately 200 mV. As will be appreciated by one having ordinary skill in the art, the effectivc amplitude for the applied voltage is a strong ftinction of several factors, including the electrode employed, the placement of the electrode and the pi-eparation of the nerve.
According to the inveniion, the simulated action potential signals of the invention can be cmployed to construct "signal trains", comprising a plurality of simulated action potential signals. The signal train can comprise a continuous train of simulated action potential signals or can included interposed signals or rest periods, i.e., zero voltage and current, between one or more simulated action potential signals.
The signal train can also comprise substantially similar simulated action potential signals, different simulated action potential signals or a combination thereof. According to the invention, the different simulated action potential signals can have different first positive voltage (V I) and/or first period of time (TI) and/or first negative voltage (V2) and/or second period of time (T2).
In accordance with one embodiment of the invention, the method for controlling respiration in a subject thus includes generating a first simulated action potential signal that is recognizable by the respiratory system as a modulation signal and (ii) transmitting the first simulated action potential signal to the body to control the respiratory systetn.
In one embodiment of the invention, the first simulated action potential signal is ti-ansrnitled to the subject's nervous system. In another embodiment, the first simulated action potential signal is transmitted proximate to a target zone on the neck, head or thorax.
ta .aTTORNEY DOCKET NO: S )3-006C1P3PCT
In accordance witli a furtliel- etnbodiment of the invention, the niethod for controlling respiration in a subject includes generating a first signal train, said signal train including a plurality of simulatcd action potential signals that are recognizable by the respiratory system as modulation signals and (ii) transmitting the first signal train to the ~ body to conu-ol the respiratory system.
According to the invention, the control of respiration can, in sonie instances, require senciing sinlulated waveform and action potential signals into one or more nel-ves, ir~cluding up to five nerves silnultaneously, to control respiration rates and depth of lo inhalation- For exarnple, the corl-ection of asthma or other breathing impairment or disease involves the rhythmic operation of the diaphragm and/or the intercostal muscles to inspire and expire air for the extraction of oxygen and the dumping of waste gaseous compounds, such as carbon dioxide.
15 As is known in the art, opening (dilation) the bronchial tubular network allows for inore air volume to be exchanged and processed for its oxygen content within the lungs.
"f'he dilation process can be controlled by transmission of the signals of the invention. The bronchi can also be closed down to restrict air volume passage into the lungs.
A balance uf controlling nerves for dilation and/or constriction can thus be accomplished through the 20 methods and apparatus of the invention.
Purther, mucus production, if excessive, can fonn mucoid plugs that restrict air volume flow throughout the bronchi. As is known in the art, no mucus is produced by the lung except in the lumen of the bronchi and also in the trachea.
The noted mucus production can, however, be increased or dccreased by transtnission of the signals of the invention. The transmission of the aforementioned signals of the invention can thus balance the quality and quantity of the mucus.
The present invention thus provides methods and apparatus to effectively control respiration rates and strength, along with bronchial tube dilation and mucinous action in the bronchi, by generating and transmitting simulated waveform and actiorl potential signals to the body. Such ability to opcn bronchi will be useful for eniergency roonl ATTOANIE1' DOCICET NO: ' 33-006C1P3PCT
treatment of acute bronchitis or smoke inhalation injuries. Chronic airway obstructive disorders, such as emphysema, can also be addressed.
Acute fire or chemical inlialation injury trcauiient can also be enhanced through the s methods and apparatus of the invention, while using mechanical respiration support.
lnjut-y-mediated mucus secretions also lead to obstruction of the airways and are refractory to ttrgent treatment, posing a life-threatening risk. Edema (swelling) inside the trachea or bronchial tubes tends to limit bore size and cause oxygen starvation. The ability to open bore size is essential or at least desirable during treatment.
to Fui-ttier, the effort of breathing in patients with pneumonia may be eased by tnodulated activation of the phrenic nerve through the methods and apparatus of the invention_ Treatment of numerous other life threatening conditions also revolves around a well functioning i-espiratory system. Therefore, the invention provides the physician with 15 a method to open bronchi and fiiie tune the breathing rate to improve oxygenation of patients. This electronic treatment method (in one embodiment) encompasses the transmission of activating or suppressing simulated action potential signals onto selected nerves to improve respiration. According to the invention, such treatments could be augmented by oxygen administration and the use of respiratory medications, which are 20 presently available.
The methods and apparatus of the invention can also be effectively employed in the treatment of obstructive sleep apnea (or central sleep apnea) and other respiratory ailments. Referring now to Fig. 6, there is shown one embodiment of a respiratory control 25 system 30 that can be employed in the treatment of sleep apnea. As illustrated in Fig. 6, the system 30 includes at least one respiration sensor 32 that is adapted to monitor the respiration status of a subject and transmit at least one signal indicative of the respiratory status.
30 According to the invention, the respiration status (and, hence, a sleep disorder) can be determined by a multitude of factors, including diaphragm movement, respiration rate, levels of 02 and/or CO2 in the blood, muscle tension in the neck, air passage (or lack thereof) in the air passages of the throat or lungs, i.e., ventilation.
Various sensors can AT'rORNEY DOCKET NO: S i3-006CIP3PCT
thus be ernployed within the scope of the invention to detect the noted factors and, hence, the onset of a respiratory disorder.
The system 30 further includes a processor 36, which is adapted to receive the respiratory system status signal(s) from the respiratory sensor 32. The processor 36 is fui-ther adapted to receive coded waveform signals recorded by a respiratory sib ial probe (shown in phantom and designated 34).
In a preferred embodiment of the invention, the processor 36 includes storage t0 rneans for storing the captui-ed, coded waveform signals and respiratory system status signals. The processoi- 36 is further adapted to extract the components of the waveform signals and store the signal components in the storage means.
In a preferred embodiment, the processor 36 is programmed to detect respiratory t s system status signals indicative of respiration abnormalities and/or wavefonn signal components indicative of respiratory system distress and generate at least one simulated waveform signal or simulated action potential signal that is operative in the control of respiration.
20 Referring to Fig. 6, the simulated wavefonn signal or simulated action potential signal is routed to a trans3nitter 38 tttat is adapted to be in communication with the subject's body. The transmitter 38 is adapted to transmit the simulated wavefonn signal or simulated action potential signal to the stibject's body (in a similar manner as described above) to control and, preferably, remedy the detected respiration abnormality.
According to the invention, the simulated waveform signal or si-nulated action potential signal is preferably transmitted to the phrenic nerve to contract the diaphragm, to the hypoglossal nerve to tighten the throat muscles and/or to the vagus nerve to maintain noi-,nal brainwave patterns. A single signal or a plurality of signals can be transmitted in conjunction with one another.
.aTTORNF:Y llOCKFT NO: S )3-006CIP3PCT
Thus, in accordance with a fiirther embodirnent of the invention, the method for controlling >-espiration in a subject generally comprises (i) Cenerating at least a first simulated action potential signal that is recognizable by the respiratory systern as a modulation si -nal, (ii) monitoring the respiration status of the subject and providing at least one respiratory system status signal in response to an abnormal function of the respiratory svstem, (iii) transmitting the simulated action potential signal to the body to control the respiration system in response to a respiration status signal that is indicative of respiratory distress or a respiratory abnormality.
EXAMPLES
The following examples are provided to enable those skilled in the art to more clearly understand and practice the present invention. They should not be considered as limiting the scope of the invention, but met-ely as being illustrated as representative thereof.
is Example 1 Four (4) juvenile swine, ranging in weight from 40 to 80 lbs., were exposed to nebulized inethacholine that was dissolved in saline. Ventilation parameters, arterial oxygen saturation and exhaled carbon dioxide were tnonitored at various concentrations of methacholine.
The vagus nerve of the swine was exposed in the neck. As reflected in Table 1, three signals were employed. Signal I comprised a sinusoidal signal having 500 Hz at 800 tnV. Signal 2 comprised a simulated action potential signal having a 400 psec, 800 mV positive voltage region and a 800 psec, -400 mV negative voltage region.
Signal 3 comprised a simulated action potential signal having a 200 sec, 800 mV
positive voltage region and a 400 sec, -400 mV negative voltage region.
.;'1 I'URNEY DOCICE'r Np: S 13-006CJP3PCT
Table I
,.- -- -- _ Parameter Methacholine Signal 1 Signal 2 Signal 3 lnereased No T:ffect No Effect Decreased Tidal Volnme _ --- ------- ---- - -Decreased Deci-eased Decreased Greatly l.espiration Rate Decreased Inci-eased Decreased Decreased Greatly Inspiratory llccrcased Pi-essure Yes, 20 Yes, Yes, No, no Manual seconds to increased increased adverse cffect d L Ventilation reeover recovery recovery time observed required time Referring to Table l, it can be seen that, upon administration of inetliacholine and transmittal of the noted signals, there was a marked reduction in respiratory rate and effort, which were similar to baseline levels without administration of methacholine.
There was also a marked reduction in oxygen saturation and exhaled CO2.
It was further found that when a simulated action potential signal having a first positive voltage of 800 mV for 200 sec and a first negative voltage of approximately -400 mV for approximately 400 lisec was applied to the swine, a reduction in sensitivity to methacholine of at least a factor of 2, and as much as a factor of 8, was realized.
The example thus reflects that a modified square wave signal can be applied to the vagus nerve to dramatically reduce the physiologic response to drugs that produce asthma symptoms. As will be appreciated by one having ordinary skill in the art, the simulated action potential signals of the invention can thus be effectively employed to mitigate the normal human response to asthma triggers, reduce the severity of asthma attacks and permit delivery of anti-inflammatory medication for better control of asthma symptoms during acute attacks.
Without departing from the spirit and scope of this invention, one of ordinary skill can make various changes and modifications to the invention to adapt it to various usages and conditions. As such, these chanGes and modifications are properly, equitably, and intended to be, within the full range of equivalence of the fallowing claims.
Claims (38)
1. A method for controlling respiration in a subject, comprising the steps of:
generating a first simulated action potential signal that is recognizable by the subject's respiratory system as a modulation signal; and transmitting at least the first simulated action potential signal to the subject's body, whereby control of the subject's respiratory system is effectuated.
generating a first simulated action potential signal that is recognizable by the subject's respiratory system as a modulation signal; and transmitting at least the first simulated action potential signal to the subject's body, whereby control of the subject's respiratory system is effectuated.
2. The method of Claim 1, wherein said first simulated action potential signal includes a positive voltage region having a first positive voltage for a first period of time and a first negative region having a first negative voltage for a second period of time.
3. The method of Claim 2, wherein said first positive voltage is in the range of approximately 100 - 1500 mV.
4. The method of Claim 2, wherein said first positive voltage is in the range of approximately 700 - 900 mV.
5. The method of Claim 2, wherein said first positive voltage is approximately 800 mV.
6. The method of Claim 2, wherein said first period of time is in the range of approximately 100 - 400 µsec.
7. The method of Claim 2, wherein said first period of time is in the range of approximately 150 - 300 µsec.
8. The method of Claim 2, wherein said first period of time is approximately 200 µsec.
9. The method of Claim 2, wherein said first negative voltage is in the range of approximately -50 mV to -750 mV.
10. The method of Claim 2, wherein said first negative voltage is in the range of approximately -350 mV to -450 mV.
11. The method of Claim 2, wherein said first negative voltage is approximately -400 mV.
12. The method of Claim 2, wherein said second period of time is in the range of approximately 200 - 800 µsec.
13. The method of Claim 2, wherein said second period of time is in the range of approximately 300 - 600 µsec.
14. The method of Claim 2, wherein said second period of time is approximately 400 µsec.
15. The method of Claim 1, wherein said simulated action potential signal is transmitted to the subject's nervous system.
16. The method of Claim 1, wherein the subject comprises a human.
17. The method of Claim 1, wherein the subject comprises an animal.
18. A method for controlling respiration, comprising the steps of:
monitoring the respiration status of a subject and providing at least one respiratory system status signal indicative of the status of the subject's respiratory system;
generating a first simulated action potential signal that is recognizable by the subject's respiratory system as a modulation signal; and transmitting said first simulated action potential signal to said subject in response to said respiratory system status signal.
monitoring the respiration status of a subject and providing at least one respiratory system status signal indicative of the status of the subject's respiratory system;
generating a first simulated action potential signal that is recognizable by the subject's respiratory system as a modulation signal; and transmitting said first simulated action potential signal to said subject in response to said respiratory system status signal.
19. The method of Claim 18, wherein said first simulated action potential signal includes a positive voltage region having a first positive voltage for a first period of time and a first negative region having a first negative voltage for a second period of time.
20. The method of Claim 19, wherein said first positive voltage is in the range of approximately 100 - 1500 mV.
21. The method of Claim 19, wherein said first positive voltage is in the range of approximately 700 - 900 mV.
22. The method of Claim 19, wherein said first positive voltage is approximately 800 mV.
23. The method of Claim 19, wherein said first period of time is in the range of approximately 100 - 400 µsec.
24. The method of Claim 19, wherein said first period of time is in the range of approximately 150 - 300 µsec.
25. The method of Claim 19, wherein said first period of time is approximately 200 µsec.
26. The method of Claim 19, wherein said first voltage is in the range of approximately -50 mV to -750 mV.
27. The method of Claim 19, wherein said first negative voltage is in the range of approximately -350 mV to -450 mV.
28. The method of Claim 19, wherein said first negative voltage is approximately -400 mV.
29. The method of Claim 19, wherein said second period of time is in the range of approximately 200 - 800 µsec.
30. The method of Claim 19, wherein said second period of time is in the range of approximately 300 - 600 µsec.
31. The method of Claim 19, wherein said second period of time is approximately 400 µsec.
32. The method of Claim 18, wherein said first simulated action potential signal is transmitted to said subject's nervous system.
33. The method of Claim 18, wherein said first simulated action potential signal is transmitted to a target zone on said subject, said target zone being selected from the neck, head and thorax.
34. The method of Claim 18, wherein said subject comprises a human.
35. The method of Claim 18, wherein said subject comprises an animal.
36. A method for controlling respiration in a subject, comprising the steps of:
generating at least a first waveform signal, said first waveform signal including at least a first simulated action potential signal, said first simulated action potential signal substantially corresponding to at least one waveform signal that is naturally generated in said subject's body; and transmitting said first waveform signal directly to said subject's body, whereby control of said subject's respiratory system is effectuated.
generating at least a first waveform signal, said first waveform signal including at least a first simulated action potential signal, said first simulated action potential signal substantially corresponding to at least one waveform signal that is naturally generated in said subject's body; and transmitting said first waveform signal directly to said subject's body, whereby control of said subject's respiratory system is effectuated.
37. The method of Claim 36, wherein said first waveform signal is transmitted to said subject's nervous system.
38. The method of Claim 36, wherein said first simulated action potential signal substantially corresponds to a waveform signal that is naturally generated in a second subject's body.
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| US11/129,264 US20050261747A1 (en) | 2003-05-16 | 2005-05-13 | Method and system to control respiration by means of neuro-electrical coded signals |
| US11/129,264 | 2005-05-13 | ||
| PCT/US2006/007953 WO2008051177A1 (en) | 2005-05-13 | 2006-03-06 | Controlling respiration by stimulated action potential signals |
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|---|---|
| CA2608849A1 true CA2608849A1 (en) | 2006-11-13 |
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| CA002608849A Abandoned CA2608849A1 (en) | 2005-05-13 | 2006-03-06 | Method and system to control respiration by means of simulated action potential signals |
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| CA002608613A Abandoned CA2608613A1 (en) | 2005-05-13 | 2006-03-06 | Method and system to control respiration by means of simulated neuro-electrical coded signals |
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