US3595228A - Flow line break alarm device - Google Patents

Flow line break alarm device Download PDF

Info

Publication number
US3595228A
US3595228A US779529A US3595228DA US3595228A US 3595228 A US3595228 A US 3595228A US 779529 A US779529 A US 779529A US 3595228D A US3595228D A US 3595228DA US 3595228 A US3595228 A US 3595228A
Authority
US
United States
Prior art keywords
coupling portions
electric
contacts
alarm device
alarm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US779529A
Inventor
Robert C Simon
Michael W Heron
Robert E Swanson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3595228A publication Critical patent/US3595228A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0051Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes with alarm devices
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means

Definitions

  • This invention relates to alarm devices and, more particularly, to electric alarm devices suitable for use with therapeutic apparatus, such as, the coupling portions of a respirator flow line and tracheostomy tube assembly for indicating a break therebetween.
  • respirator hose and tube employed in a tracheostomy which continuously delivers a negative and positive oxygen pressure. While some types of alarm devices for detecting breaks in airflow lines have theretofore been provided such as pressure responsive devices they have not proved entirely satisfactory for all applications.
  • an object of this invention is to provide a simplified, reliable, lightweight, safe and easy to use electric alarm device.
  • Another object of this invention is to provide an electric alarm device which is extremely sensitive and is readily conformable for use with various types of therapeutic apparatus.
  • a further object of this invention is to provide an electric alarm device suitable for use in the presence of oxygen without danger of sparking for the purpose of alerting hospital personnel when there is a break in the coupling between a respirator flow line and a tracheostomy tube attached to a patient.
  • FIG. 1 is a perspective view of an alarm device embodying features of the present invention attached to line coupling portions between a respirator supply line and a plastic tracheostomy tube shown partially retracted from the trachea of a patient, the coupling portions being shown in a separated position;
  • FIG. 2 is a perspective view of the alarm device shown in FIG. I attached to coupling portions between a respirator supply line and'metal tracheostomy tube with the coupling portions shown in an interfitting connected position and the tracheostomy tube inserted into the trachea ofa patient; and
  • FIG. 3 is an electric circuit diagram of an alarm circuit which is preferably contained in the portable box shown in FIGS. 1 and 2.
  • FIG. 1 a typical airflow system for tracheostomy usage wherein a respirator supply represented at 3 has a flexible hose outlet or line 4 which is adapted to be detachably coupled to a tracheostomy tube 6, the latter being normally attached to the neck ofa patient P with one end inserted into the trachea designated at T.
  • a flange member 8 is disposed on the tracheostomy tube and in normal use is tied around the back of the patients neck to secure the tracheostomy tube 6 in fully inserted position.
  • the respirator supply 3 may be one of a variety of known oxygen sources of the inspirator-expirator type capable of alternately producing a positive and negative pressure in the output line for inspiration and expiration.
  • a releasable connection or coupling is provided between the supply hose 4 and the intake end of the tracheostomy tube 6 to permit repeated cleaning and care of the trachea of the patient.
  • This coupling requires ease of separation, and a typical form is a friction-fitting type coupling as shown comprising an elbow-shaped female portion 11 at the discharge end of the supply hose 4 and a male portion 12 at the intake end of the tracheostomy tube which interconnect or interfit to form a detachable coupling.
  • the tracheostomy tube 6 and associated flange 8 may be conventionally formed either of an electrically nonconductive or insulative material, usually plastic, as depicted in FIG. 1; or they are often composed of an electrically conductive material, such as, metal as depicted in FIG. 2, and the tube and flange are designated by numerals l5 and 16, respectively.
  • the female coupling portions 11 in both forms are preferably composed of an insulative material, such as, a plastic with the male coupling end 17 of the metal tracheostomy tube 15 also being of a conductive metal forming an extension of the tracheostomy tube.
  • the electric alarm or signal apparatus devised for the airflow tracheostomy systems described broadly is capable of sensing a leak or break in the airflow line to the tracheostomy tube, and more specifically a separation in the friction-fitting coupling portions, and of activating an alarm element which can be heard by hospital personnel at a point remote from the patient.
  • the sensing portion or sensor arrangement of the alarm device associated with the tracheostomy tube of FIG. 1 includes an electric contact 19, herein referred to as the first electric contact, supported on the female coupling portion 11; and another electric contact, referred to as the second electric contact, is supported on the male coupling portion 12.
  • the first and second contacts engage one another when the coupling portions are physically connected and are movable to an electrically disconnected position when the coupling portions are separated.
  • Contacts 19 and 20 may be disposed on the coupling portions in a number of ways to effect the desired electric connection and disconnection therebetween.
  • a preferred arrangement for the first contact 19 in FIG. 1 and 2 is to utilize an insulated wire wound in a plurality of turns to define a helical coil designated 21 in surrounding relation to one end of the female coupling portion 11, the end loop or turn having its insulation removed so as to be bare or exposed.
  • the second electric contact 20 for the form of FIG.
  • helical coil 1 may be noninsulated wired wound in a plurality of turns or loops defining a helical coil designated 22 of approximately the same diameter as coil 21 in surrounding relation to the male coupling portion 12, the end loop of the wire adjacent the exposed end loop forming the contact 19 being similarly exposed.
  • the helical coil members on the coupling portions are aligned so as to compress or bias the contacts 19 and 20 together when the coupling portions are connected.
  • the first contact 19 is electrically connected to the electric alarm actuating circuitry contained in a portable box 23 shown in FIGS. 1 and 2 by means of an electric lead preferably a coaxial cable 24, having an alligator-type clip 25 mounted at its extended end.
  • an electric lead preferably a coaxial cable 24, having an alligator-type clip 25 mounted at its extended end.
  • the other end of coil 21 is secured to the alligator-type clip 25, for instance, by soldering.
  • the alligatortype clip 25 is clamped to the female joint portion 11 to hold the coil 21 and cable 24 in a proper position.
  • the second contact 20 for the plastic tracheostomy tube 6 is electrically connected through coil 22 to a skin electrode 27 which may be attached and grounded to the body of the patient as by tape 28.
  • a second contact designated 29 need only be a piece of electrically conductive material mounted on the outer surface of the intake end of the male joint portion 17 which will engage the bared wire or contact element 19 when the coupling portions are connected.
  • the end surface of the metal male joint portion 17 could also define the second electric contact.
  • the metal tracheostomy tube suitably contacts the patients body to perform the same function as the skin electrode 27 shown in the arrangement ofFlG. l.
  • the box 23 or container for the electric alarm actuating circuitry and alarm element may be of a variety of configurations but for the instant tracheostomy application it is important that it be ofa lightweight metal such as aluminum.
  • the top of the box serves as a combined panel and support for an on-off switch 3], a reset button 32 and a speaker 33, described more fully hereinafter in connection with the circuit diagram of FIG. 3.
  • the electric alarm-actuating circuitry shown in FIG. 3 may be generally characterized as a relaxation oscillator type pulsing circuit which comprises a low voltage DC power source illustrated as two batteries 35 and 36 connected in series having the on-off switch 31 connected therein.
  • a series circuit is connected across the power source including resistors 37 and 38, a negative resistance element shown in the form of a neon lamp 39, a capacitor 41 connected between one electrode of the lamp and a variable tap on load resistor 42.
  • Capacitor 46 is connected between the other electrode of the lamp and one end terminal designated 44 of the load resistor 42, the other end terminal being designated 45, and a capacitor 47 is connected to the lamp electrode common to resistor 38.
  • One end of the inner solid cylindrical conductor of the coaxial cable 24 has its outer conductor connected to the common ground or zero potential portion of the circuit. As shown in FIG. 3 the alligator clip is connected to the other end of the inner conductor of cable 24 and through contacts 19 and to the patients body, through the skin electrode 27 shown in FIG. 3, or alternately to the metal tracheostomy tube 15 of FIG. 2.
  • the alarm element 48 is connected in a series circuit including the cathode and anode of an electronic solid state switch element 49, preferably a silicon-controlled rectifier, and a reset switch 32, and which circuit is connected across battery 36 and on-off switch 31.
  • the gate and cathode elements of the SCR 49 are connected across load resistor 42, and specifically terminal 44 is connected to the anode through switch 32 and terminal 45 to the gate.
  • a preselected positive firing voltage applied between the gate and cathode elements will cause the SCR 49 to conduct between the cathode and anode thereby applying the voltage of battery 36 to the alarm element 48.
  • An alarm element 48 which is suitable for the circuit above described is a Mallory Tone-Alert, manufactured by P. R. Mallory and Company, lnc. of Indianapolis, lnd., having a speaker 33 for transmitting the sound to hospital personnel. However. it is understood that a variety of warning devices such as a relay, light for bell may be used.
  • the contacts 19 and 20 are closed to establish an essentially zero or ground reference potential at capacitor 46.
  • negative pulses are formed across load resistor 42 at its tap by the charging and discharging of capacitor 41
  • positive pulses are formed across load resistor 42 by the charging and discharging of capacitor 41 which in effect add algebraically to form an instantaneous voltage between the gate and anode of the SCR.
  • An adjustment of the tap on resistor 42 regulates this voltage level.
  • the circuit resistor 42 is set with nothing connected in series with capacitor 45, i.e., when the contacts are open. Under this condition pairing of the positive and negative pulses is just great enough to fire the SCR.
  • the oscillator circuit is sufficiently altered to hold the SCR off.
  • the SCR fires it will continue to conduct until the current flow in the cathode is momentarily broken.
  • Reset switch 32 is used to perform the function after firing. With the use of low voltage DC batteries a typical circuit of this type will draw on the order of 20 microamperes when the SCR is not conducting and 9 to 14 microamperes when fired. A positive voltage of 0.8 volt or slightly more across resistor 42 fires the SCR.
  • the single coaxial type cable 24 connected to one contact is preferred for simplicity of attachment but it is understood that a second cable connected to the other contact and grounded to the box could be used in place of the body electrode or metal tracheostomy tube ground. Further the present device using electric pulses to indicate a line break is suitable for wireless transmission wherein such pulses may be modulated and transmitted as radio waves to a distant receiving station.
  • An alarm device for signaling a line separation comprising interfitting male and female line coupling portions in the fiow line between a tracheostomy tube and a respirator hose,
  • sensing means including first and second electric contacts arranged for support on said male and female linecoupling portions and being aligned for electric connection with each other when the coupling portions are joined for disconnection when the coupling portions are separated,
  • An alarm device as set forth in claim 1 further including a coaxial cable arranged to clamp on one of said coupling portions to connect one of said electric contacts to said electric circuit means.
  • At least one of said electric contacts is an exposed wire loop at one end of a coil of insulated wire slidably mounted on one of said coupling portions.
  • one of said coupling portions is formed of an insulative material and said associated contact is an end loop of a coil of wire wound on said coupling portion.
  • tracheostomy tube and associated coupling portion is formed of an electrically conductive material and having means forming one of said contacts for connecting the circuit means to the body of the patient.
  • said electric circuit means includes a relaxation oscillator circuit for simultaneously generating pulses of an opposite polarity which are applied across the electrodes of an electronic switch element in the circuit of the alarm element for triggering said switch element when the contacts are separated.
  • oscillator circuit includes a negative resistance element and capacitors connected thereto and interconnected with a load resistor across which said pulses are formed.
  • An electric alarm device for signaling a line separation comprising male and female line-coupling portions in the flow line between a tracheostomy tube and a respirator hose,
  • an electric contact arranged for support on each of said coupling portions to be engageable with each other when said coupling portions are joined and disengaged when said coupling portions are separated, and
  • electronic circuit means including an audible alarm element and electric power source for the alarm element and means connected to one of said contact elements to al ternately connect the power source to the alarm element when the contacts are in engagement and disconnect the power source from the alarm element when the contacts are separated.
  • An alarm device for signaling a line separation comprising interfitting male and female line coupling portions in the flow line between a tracheostomy tube and a respirator hose,

Abstract

A portable alarm device is attached to interfitting coupling portions in a therapeutic apparatus, such as, the metal or plastic coupling portions between a respirator hose and tracheostomy tube, the device including normally engaging electric contacts on the coupling portions which separate with the coupling portions to sense a break. One contact is connected to the patient''s body, the other contact connected to a low-power electric pulse generating circuit for triggering an electric switch, the latter being adapted to activate the alarm element when the contacts disconnect to alert hospital personnel.

Description

United States Patent Robert C. Simon 3159 Vaughn St.. Aurora, Colo. 80010: Michael W. Heron, 182 S. Humboldt, Denver, Colo. 80209: Robert E. Swanson, 4725 l'lighline Place, Denver, Colo. 80222 Appl. No. 779,529
Filed Nov. 27, 1968 Patented July 27, 1971 inventors F LOW LINE BREAK ALARM DEVICE 12 Claims, 3 Drawing Figs.
U.S.Cl l28/145.S
340/256, 340/421, 285/93 Int. Cl A62b 9/04 Field oiSearch 128/1455,
[56] References Cited UNlTED STATES PATENTS 693,092 2/1902 Weitz 285/93 3,297,889 1/1967 Breskend..... 310/8.1 3,425,050 1/1969 Tellerman 340/256 3,444,547 5/1969 Surek 340/280 Primary Examiner Richard A. Gaudet Assistant ExaminerG. F. Dunne Attorney-John E. Reilly ABSTRACT: A portable alarm device is attached to interfitting coupling portions in a therapeutic apparatus, such as, the metal or plastic coupling portions between a respirator hose and tracheostomy tube, the device including normally engaging electric contacts on the coupling portions which separate with the coupling portions to sense a break. One contact is connected to the patients body, the other contact connected to a low-power electric pulse generating circuit for triggering an electric switch, the latter being adapted to activate the alarm element when the contacts disconnect to alert hospitalpersonnel.
PATENTED JUL2 7 1971 lfi-lVlif'fl lk's ROBERT C. SIMON MICHAEL W. HERON ROBERT E. SWANSON A r TOR/VF FLOW LINE BREAK ALARM DEVICE This invention relates to alarm devices and, more particularly, to electric alarm devices suitable for use with therapeutic apparatus, such as, the coupling portions of a respirator flow line and tracheostomy tube assembly for indicating a break therebetween.
A variety of types of flow lines are presently in use as an integral part of commercially available therapeutic apparatus. In many instances, particularly when treatment with such apparatus is carried out over extended periods of time, it is not practical to have an attendant present at all times; yet it is readily apparent that a failure in therapeutic apparatus such as an undetected break in an oxygen line may be seriously harmful or even fatal to the patient.
One typical example is the respirator hose and tube employed in a tracheostomy which continuously delivers a negative and positive oxygen pressure. While some types of alarm devices for detecting breaks in airflow lines have theretofore been provided such as pressure responsive devices they have not proved entirely satisfactory for all applications.
Accordingly an object of this invention is to provide a simplified, reliable, lightweight, safe and easy to use electric alarm device.
Another object of this invention is to provide an electric alarm device which is extremely sensitive and is readily conformable for use with various types of therapeutic apparatus.
A further object of this invention is to provide an electric alarm device suitable for use in the presence of oxygen without danger of sparking for the purpose of alerting hospital personnel when there is a break in the coupling between a respirator flow line and a tracheostomy tube attached to a patient.
It is a still further object of this invention to provide a portable alarm device which is easily transportable to the point of use and is readily attachable to releasable flow line couplings of the type utilized between a respirator supply hose and tracheostomy tube inserted into the trachea of a patient.
Other objects, advantages and capabilities of the present invention will become more apparent from a consideration of the following description when taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a perspective view of an alarm device embodying features of the present invention attached to line coupling portions between a respirator supply line and a plastic tracheostomy tube shown partially retracted from the trachea of a patient, the coupling portions being shown in a separated position;
FIG. 2 is a perspective view of the alarm device shown in FIG. I attached to coupling portions between a respirator supply line and'metal tracheostomy tube with the coupling portions shown in an interfitting connected position and the tracheostomy tube inserted into the trachea ofa patient; and
FIG. 3 is an electric circuit diagram of an alarm circuit which is preferably contained in the portable box shown in FIGS. 1 and 2.
Referring now to the drawings, there is shown by way of illustrative example in FIG. 1 a typical airflow system for tracheostomy usage wherein a respirator supply represented at 3 has a flexible hose outlet or line 4 which is adapted to be detachably coupled to a tracheostomy tube 6, the latter being normally attached to the neck ofa patient P with one end inserted into the trachea designated at T. Although the tracheostomy tube 6 is shown partially retracted in FIG. I, a flange member 8 is disposed on the tracheostomy tube and in normal use is tied around the back of the patients neck to secure the tracheostomy tube 6 in fully inserted position. The respirator supply 3 may be one of a variety of known oxygen sources of the inspirator-expirator type capable of alternately producing a positive and negative pressure in the output line for inspiration and expiration.
A releasable connection or coupling is provided between the supply hose 4 and the intake end of the tracheostomy tube 6 to permit repeated cleaning and care of the trachea of the patient. This coupling requires ease of separation, and a typical form is a friction-fitting type coupling as shown comprising an elbow-shaped female portion 11 at the discharge end of the supply hose 4 and a male portion 12 at the intake end of the tracheostomy tube which interconnect or interfit to form a detachable coupling.
The tracheostomy tube 6 and associated flange 8 may be conventionally formed either of an electrically nonconductive or insulative material, usually plastic, as depicted in FIG. 1; or they are often composed of an electrically conductive material, such as, metal as depicted in FIG. 2, and the tube and flange are designated by numerals l5 and 16, respectively. The female coupling portions 11 in both forms are preferably composed of an insulative material, such as, a plastic with the male coupling end 17 of the metal tracheostomy tube 15 also being of a conductive metal forming an extension of the tracheostomy tube.
In accordance with the present invention, the electric alarm or signal apparatus devised for the airflow tracheostomy systems described broadly is capable of sensing a leak or break in the airflow line to the tracheostomy tube, and more specifically a separation in the friction-fitting coupling portions, and of activating an alarm element which can be heard by hospital personnel at a point remote from the patient. To this end, the sensing portion or sensor arrangement of the alarm device associated with the tracheostomy tube of FIG. 1 includes an electric contact 19, herein referred to as the first electric contact, supported on the female coupling portion 11; and another electric contact, referred to as the second electric contact, is supported on the male coupling portion 12. Essentially, the first and second contacts engage one another when the coupling portions are physically connected and are movable to an electrically disconnected position when the coupling portions are separated.
Contacts 19 and 20 may be disposed on the coupling portions in a number of ways to effect the desired electric connection and disconnection therebetween. For convenience of assembly onto the coupling portions presently in use on the tracheostomy tube and respirator hose and for effecting a good electric connection between contacts, a preferred arrangement for the first contact 19 in FIG. 1 and 2 is to utilize an insulated wire wound in a plurality of turns to define a helical coil designated 21 in surrounding relation to one end of the female coupling portion 11, the end loop or turn having its insulation removed so as to be bare or exposed. The second electric contact 20 for the form of FIG. 1 may be noninsulated wired wound in a plurality of turns or loops defining a helical coil designated 22 of approximately the same diameter as coil 21 in surrounding relation to the male coupling portion 12, the end loop of the wire adjacent the exposed end loop forming the contact 19 being similarly exposed. The helical coil members on the coupling portions are aligned so as to compress or bias the contacts 19 and 20 together when the coupling portions are connected.
The first contact 19 is electrically connected to the electric alarm actuating circuitry contained in a portable box 23 shown in FIGS. 1 and 2 by means of an electric lead preferably a coaxial cable 24, having an alligator-type clip 25 mounted at its extended end. In the preferred coil arrangement shown, the other end of coil 21 is secured to the alligator-type clip 25, for instance, by soldering. In the assembly shown the alligatortype clip 25 is clamped to the female joint portion 11 to hold the coil 21 and cable 24 in a proper position.
The second contact 20 for the plastic tracheostomy tube 6 is electrically connected through coil 22 to a skin electrode 27 which may be attached and grounded to the body of the patient as by tape 28. When the metal type tracheostomy tube 15 of FIG. 2 is employed a second contact designated 29 need only be a piece of electrically conductive material mounted on the outer surface of the intake end of the male joint portion 17 which will engage the bared wire or contact element 19 when the coupling portions are connected. The end surface of the metal male joint portion 17 could also define the second electric contact. The metal tracheostomy tube suitably contacts the patients body to perform the same function as the skin electrode 27 shown in the arrangement ofFlG. l.
The box 23 or container for the electric alarm actuating circuitry and alarm element may be of a variety of configurations but for the instant tracheostomy application it is important that it be ofa lightweight metal such as aluminum. The top of the box serves as a combined panel and support for an on-off switch 3], a reset button 32 and a speaker 33, described more fully hereinafter in connection with the circuit diagram of FIG. 3.
The electric alarm-actuating circuitry shown in FIG. 3 may be generally characterized as a relaxation oscillator type pulsing circuit which comprises a low voltage DC power source illustrated as two batteries 35 and 36 connected in series having the on-off switch 31 connected therein. A series circuit is connected across the power source including resistors 37 and 38, a negative resistance element shown in the form of a neon lamp 39, a capacitor 41 connected between one electrode of the lamp and a variable tap on load resistor 42. Capacitor 46 is connected between the other electrode of the lamp and one end terminal designated 44 of the load resistor 42, the other end terminal being designated 45, and a capacitor 47 is connected to the lamp electrode common to resistor 38. One end of the inner solid cylindrical conductor of the coaxial cable 24 has its outer conductor connected to the common ground or zero potential portion of the circuit. As shown in FIG. 3 the alligator clip is connected to the other end of the inner conductor of cable 24 and through contacts 19 and to the patients body, through the skin electrode 27 shown in FIG. 3, or alternately to the metal tracheostomy tube 15 of FIG. 2.
The alarm element 48 is connected in a series circuit including the cathode and anode of an electronic solid state switch element 49, preferably a silicon-controlled rectifier, and a reset switch 32, and which circuit is connected across battery 36 and on-off switch 31. The gate and cathode elements of the SCR 49 are connected across load resistor 42, and specifically terminal 44 is connected to the anode through switch 32 and terminal 45 to the gate. A preselected positive firing voltage applied between the gate and cathode elements will cause the SCR 49 to conduct between the cathode and anode thereby applying the voltage of battery 36 to the alarm element 48. An alarm element 48 which is suitable for the circuit above described is a Mallory Tone-Alert, manufactured by P. R. Mallory and Company, lnc. of Indianapolis, lnd., having a speaker 33 for transmitting the sound to hospital personnel. However. it is understood that a variety of warning devices such as a relay, light for bell may be used.
In sequence of operation with the circuit elements connected as shown, the contacts 19 and 20 are closed to establish an essentially zero or ground reference potential at capacitor 46. With the battery polarity as illustrated, negative pulses are formed across load resistor 42 at its tap by the charging and discharging of capacitor 41, and positive pulses are formed across load resistor 42 by the charging and discharging of capacitor 41 which in effect add algebraically to form an instantaneous voltage between the gate and anode of the SCR. An adjustment of the tap on resistor 42 regulates this voltage level. When the contacts open, the electrical connection to ground or zero potential for the relaxation oscillator circuit is removed and results in a sufficient change in the sum ofthe positive and negative pulses to fire the SCR 49.
Initially the circuit resistor 42 is set with nothing connected in series with capacitor 45, i.e., when the contacts are open. Under this condition pairing of the positive and negative pulses is just great enough to fire the SCR. When additional capacitors of the cable 24 are added to the circuit, the oscillator circuit is sufficiently altered to hold the SCR off. When the SCR fires it will continue to conduct until the current flow in the cathode is momentarily broken. Reset switch 32 is used to perform the function after firing. With the use of low voltage DC batteries a typical circuit of this type will draw on the order of 20 microamperes when the SCR is not conducting and 9 to 14 microamperes when fired. A positive voltage of 0.8 volt or slightly more across resistor 42 fires the SCR.
The single coaxial type cable 24 connected to one contact is preferred for simplicity of attachment but it is understood that a second cable connected to the other contact and grounded to the box could be used in place of the body electrode or metal tracheostomy tube ground. Further the present device using electric pulses to indicate a line break is suitable for wireless transmission wherein such pulses may be modulated and transmitted as radio waves to a distant receiving station.
While the present invention has been described with reference to particular structure there is no intent to limit the spirit and scope of the present invention to such structure except as defined by the appended claims.
We claim:
1. An alarm device for signaling a line separation comprising interfitting male and female line coupling portions in the fiow line between a tracheostomy tube and a respirator hose,
sensing means including first and second electric contacts arranged for support on said male and female linecoupling portions and being aligned for electric connection with each other when the coupling portions are joined for disconnection when the coupling portions are separated,
an alarm element, and
electric circuit means coupled to said alarm element and responsive to the disconnection of said contacts for actuating said alarm element.
2. An alarm device as set forth in claim 1 wherein one of electric contacts is connected to an electrode and includes means for attachment to the body of a patient to ground said circuit means to said patient when said contacts are closed.
3. An alarm device as set forth in claim 1 further including a coaxial cable arranged to clamp on one of said coupling portions to connect one of said electric contacts to said electric circuit means.
4. An alarm device as set forth in claim 1 wherein at least one of said electric contacts is an exposed wire loop at one end of a coil of insulated wire slidably mounted on one of said coupling portions.
5. An alarm device as set forth in claim 1 wherein one of said coupling portions is formed of an insulative material and said associated contact is an end loop of a coil of wire wound on said coupling portion.
6. An alarm device as set forth in claim 5 wherein said coil of wire is connected to a skin electrode including means for fastening to the body ofa patient.
7. An alarm device as set forth in claim 1 wherein the tracheostomy tube and associated coupling portion is formed of an electrically conductive material and having means forming one of said contacts for connecting the circuit means to the body of the patient.
8. An alarm device as set forth in claim 1 wherein said electric circuit means includes a relaxation oscillator circuit for simultaneously generating pulses of an opposite polarity which are applied across the electrodes of an electronic switch element in the circuit of the alarm element for triggering said switch element when the contacts are separated.
9. An alarm device as set forth in claim 8 wherein said electronic switch element is a silicon controlled rectifier.
10. An alarm device as set forth in claim 8 wherein said oscillator circuit includes a negative resistance element and capacitors connected thereto and interconnected with a load resistor across which said pulses are formed.
11. An electric alarm device for signaling a line separation, comprising male and female line-coupling portions in the flow line between a tracheostomy tube and a respirator hose,
an electric contact arranged for support on each of said coupling portions to be engageable with each other when said coupling portions are joined and disengaged when said coupling portions are separated, and
electronic circuit means including an audible alarm element and electric power source for the alarm element and means connected to one of said contact elements to al ternately connect the power source to the alarm element when the contacts are in engagement and disconnect the power source from the alarm element when the contacts are separated.
12. An alarm device for signaling a line separation comprising interfitting male and female line coupling portions in the flow line between a tracheostomy tube and a respirator hose,
an electric contact arranged for slidable movement on each of the coupling portions to be electrically connected with

Claims (12)

1. An alarm device for signaling a line separation comprising interfitting male and female line coupling portions in the flow line between a tracheostomy tube and a respirator hose, sensing means including first and second electric contacts arranged for support on said male and female line-coupling portions and being aligned for electric connection with each other when the coupling portions are joined for disconnection when the coupling portions are separated, an alarm element, and electric circuit means coupled to said alarm element and responsive to the disconnection of said contacts for actuating said alarm element.
2. An alarm device as set forth in claim 1 wherein one of electric contacts is connected to an electrode and includes means for attachment to the body of a patient to ground said circuit means to said patient when said contacts are closed.
3. An alarm device as set forth in claim 1 further including a coaxial cable arranged to clamp on one of said coUpling portions to connect one of said electric contacts to said electric circuit means.
4. An alarm device as set forth in claim 1 wherein at least one of said electric contacts is an exposed wire loop at one end of a coil of insulated wire slidably mounted on one of said coupling portions.
5. An alarm device as set forth in claim 1 wherein one of said coupling portions is formed of an insulative material and said associated contact is an end loop of a coil of wire wound on said coupling portion.
6. An alarm device as set forth in claim 5 wherein said coil of wire is connected to a skin electrode including means for fastening to the body of a patient.
7. An alarm device as set forth in claim 1 wherein the tracheostomy tube and associated coupling portion is formed of an electrically conductive material and having means forming one of said contacts for connecting the circuit means to the body of the patient.
8. An alarm device as set forth in claim 1 wherein said electric circuit means includes a relaxation oscillator circuit for simultaneously generating pulses of an opposite polarity which are applied across the electrodes of an electronic switch element in the circuit of the alarm element for triggering said switch element when the contacts are separated.
9. An alarm device as set forth in claim 8 wherein said electronic switch element is a silicon controlled rectifier.
10. An alarm device as set forth in claim 8 wherein said oscillator circuit includes a negative resistance element and capacitors connected thereto and interconnected with a load resistor across which said pulses are formed.
11. An electric alarm device for signaling a line separation, comprising male and female line-coupling portions in the flow line between a tracheostomy tube and a respirator hose, an electric contact arranged for support on each of said coupling portions to be engageable with each other when said coupling portions are joined and disengaged when said coupling portions are separated, and electronic circuit means including an audible alarm element and electric power source for the alarm element and means connected to one of said contact elements to alternately connect the power source to the alarm element when the contacts are in engagement and disconnect the power source from the alarm element when the contacts are separated.
12. An alarm device for signaling a line separation comprising interfitting male and female line coupling portions in the flow line between a tracheostomy tube and a respirator hose, an electric contact arranged for slidable movement on each of the coupling portions to be electrically connected with each other when the coupling portions are connected and to be disconnected when the coupling portions are separated, a first electric circuit including a power supply, an audible alarm element and a low voltage electronic switch arranged to turn on the alarm element when triggered, and a second electric circuit connected to one of said contacts and the electronic switch having means for generating a plurality of electric pulses which sufficiently change in amplitude when said contacts separate to trigger said switch for activating said alarm element.
US779529A 1968-11-27 1968-11-27 Flow line break alarm device Expired - Lifetime US3595228A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77952968A 1968-11-27 1968-11-27

Publications (1)

Publication Number Publication Date
US3595228A true US3595228A (en) 1971-07-27

Family

ID=25116735

Family Applications (1)

Application Number Title Priority Date Filing Date
US779529A Expired - Lifetime US3595228A (en) 1968-11-27 1968-11-27 Flow line break alarm device

Country Status (1)

Country Link
US (1) US3595228A (en)

Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952739A (en) * 1974-10-21 1976-04-27 Airco, Inc. Fail safe system for a patient triggered respirator
US4023073A (en) * 1975-12-08 1977-05-10 Graco Inc. Open circuit detector
DE3302321A1 (en) * 1982-11-13 1984-05-17 Drägerwerk AG, 2400 Lübeck MONITORING DEVICE FOR MEDICAL DEVICES
US5134248A (en) * 1990-08-15 1992-07-28 Advanced Temperature Devices, Inc. Thin film flexible electrical connector
US5320092A (en) * 1991-08-05 1994-06-14 Ryder Steven L Fluid delivery apparatus with alarm
WO1994022516A1 (en) * 1993-04-02 1994-10-13 Josef Klimm Device for monitoring at least one connection in a medical tubing system
EP0661071A1 (en) * 1993-12-01 1995-07-05 Resmed Limited Device for continuous positive airway pressure breathing (CPAP)
US5492110A (en) * 1994-12-23 1996-02-20 Golden West Communications Switched alert circuit for fireman's breathing system
US5517983A (en) * 1992-12-09 1996-05-21 Puritan Bennett Corporation Compliance meter for respiratory therapy
EP0742027A2 (en) * 1995-05-12 1996-11-13 Instrumentarium Oy Arrangement for leak testing taking place in connection with a ventilator
US5881717A (en) * 1997-03-14 1999-03-16 Nellcor Puritan Bennett Incorporated System and method for adjustable disconnection sensitivity for disconnection and occlusion detection in a patient ventilator
US5970975A (en) * 1991-11-01 1999-10-26 Respironics, Inc. Sleep apnea treatment apparatus
US6029665A (en) * 1993-11-05 2000-02-29 Resmed Limited Determination of patency of airway
US6029660A (en) * 1996-12-12 2000-02-29 Resmed Limited Substance delivery apparatus
US6091973A (en) * 1995-04-11 2000-07-18 Resmed Limited Monitoring the occurrence of apneic and hypopneic arousals
US6152129A (en) * 1996-08-14 2000-11-28 Resmed Limited Determination of leak and respiratory airflow
US6155986A (en) * 1995-06-08 2000-12-05 Resmed Limited Monitoring of oro-nasal respiration
US6161877A (en) * 1999-05-25 2000-12-19 Applied Materials, Inc. Conduit interlock assembly
US6182657B1 (en) 1995-09-18 2001-02-06 Resmed Limited Pressure control in CPAP treatment or assisted respiration
US6213119B1 (en) 1995-10-23 2001-04-10 Resmed Limited Inspiratory duration in CPAP or assisted respiration treatment
US6226165B1 (en) 1999-04-14 2001-05-01 Dell Usa, L.P. System and method for securing a computer system
US6237592B1 (en) 1995-07-03 2001-05-29 Resmed Limited Auto-calibration of pressure transducer offset
US6253764B1 (en) 1996-05-08 2001-07-03 Resmed, Ltd. Control of delivery pressure in CPAP treatment or assisted respiration
US6269811B1 (en) 1998-11-13 2001-08-07 Respironics, Inc. Pressure support system with a primary and a secondary gas flow and a method of using same
US6332463B1 (en) 1995-09-15 2001-12-25 Resmed Limited Flow estimation and compensation of flow-induced pressure swings in CPAP treatment and assisted respiration
US6367474B1 (en) 1997-11-07 2002-04-09 Resmed Limited Administration of CPAP treatment pressure in presence of APNEA
US6386196B1 (en) * 2000-03-13 2002-05-14 Steven E. Culton Warning device for oxygen delivery system failure
US6397841B1 (en) 1997-06-18 2002-06-04 Resmed Limited Apparatus for supplying breathable gas
US20020124848A1 (en) * 1987-06-26 2002-09-12 Sullivan Colin Edward Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US6532957B2 (en) 1996-09-23 2003-03-18 Resmed Limited Assisted ventilation to match patient respiratory need
US6629527B1 (en) 1991-10-17 2003-10-07 Respironics, Inc. Sleep apnea treatment apparatus
US6635021B1 (en) 1987-06-26 2003-10-21 Resmed Limited Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US20030213490A1 (en) * 2002-05-20 2003-11-20 Sim Italia S.R.L. Apparatus for controlling the dispensing of medical gases, particularly for assisting respiration
US6679432B1 (en) * 2002-08-08 2004-01-20 Arizant Healthcare Inc. Audible indication of disconnection between a convective device and an air hose in a convective warming system
US20040016433A1 (en) * 1991-11-01 2004-01-29 Respironics, Inc. Sleep apnea treatment apparatus
US20040123866A1 (en) * 1993-11-05 2004-07-01 Michael Berthon-Jones Determination of patency of the airway
US20060086357A1 (en) * 2004-10-25 2006-04-27 Soliman Ihab S Patient circuit disconnect system for a ventilator and method of detecting patient circuit disconnect
US7109731B2 (en) 1996-08-08 2006-09-19 Cascade Microtech, Inc. Membrane probing system with local contact scrub
US20070000491A1 (en) * 2002-08-29 2007-01-04 Philippe Chalvignac Breathing assistance device with serveral secure repirator modes and associated method
US20070173099A1 (en) * 2002-06-25 2007-07-26 Resmed Limited Method and apparatus for control of appliance coupler retention and withdrawal forces
US7403025B2 (en) 2000-02-25 2008-07-22 Cascade Microtech, Inc. Membrane probing system
US7492175B2 (en) 2001-08-21 2009-02-17 Cascade Microtech, Inc. Membrane probing system
US7514944B2 (en) 2004-07-07 2009-04-07 Cascade Microtech, Inc. Probe head having a membrane suspended probe
US7533462B2 (en) 1999-06-04 2009-05-19 Cascade Microtech, Inc. Method of constructing a membrane probe
US7681312B2 (en) 1998-07-14 2010-03-23 Cascade Microtech, Inc. Membrane probing system
US20100078024A1 (en) * 2008-09-30 2010-04-01 Nellcor Puritan Bennett Llc Breathing assistance system with multiple pressure sensors
US7888957B2 (en) 2008-10-06 2011-02-15 Cascade Microtech, Inc. Probing apparatus with impedance optimized interface
US8322339B2 (en) 2006-09-01 2012-12-04 Nellcor Puritan Bennett Llc Method and system of detecting faults in a breathing assistance device
US8410806B2 (en) 2008-11-21 2013-04-02 Cascade Microtech, Inc. Replaceable coupon for a probing apparatus
US20130239960A1 (en) * 2011-09-12 2013-09-19 Resmed Limited Modularized respiratory treatment apparatus
US20140014095A1 (en) * 2012-07-11 2014-01-16 Nellcor Puritan Bennett Llc Tracheal tube with inner cannula indication system
US8844537B1 (en) 2010-10-13 2014-09-30 Michael T. Abramson System and method for alleviating sleep apnea
US20150040896A1 (en) * 2012-03-06 2015-02-12 Koninklijke Philips N.V. Patient interface having illuminated portion
US20150306323A1 (en) * 2014-03-11 2015-10-29 Edrine Pineda Buenafe System For Alarm-Monitoring Patients On Continuous Free Flow Oxygen Delivery Via T-Piece On Closed Tracheal Suction System
US9592353B2 (en) * 2015-04-30 2017-03-14 Sanjay K Roy Adaptor/tubing with alarm(s)
US9773393B2 (en) 2015-10-07 2017-09-26 Michael D. Velez Flow alarm
US9788583B1 (en) 2016-06-20 2017-10-17 Innovations Unlimited, LLC Medical tube safety device
WO2018064471A1 (en) * 2016-09-29 2018-04-05 The Regents Of The University Of California Tracheotomy tube-based monitoring systems and methods
USD887549S1 (en) 2018-09-10 2020-06-16 Masino Corporation Cap for a flow alarm device
USD887548S1 (en) 2018-09-10 2020-06-16 Masimo Corporation Flow alarm device housing
US11890413B2 (en) 2019-11-14 2024-02-06 Innovations Unlimited, LLC Trachcollar safety alarm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693092A (en) * 1901-07-19 1902-02-11 Franklin K Young Electric hose-signal system.
US3297889A (en) * 1964-01-15 1967-01-10 Breskend Sam Clock driver
US3425050A (en) * 1965-10-12 1969-01-28 Continental Instr Corp Theft-preventing alarm device
US3444547A (en) * 1965-10-08 1969-05-13 Gefco Mfg Corp Anti-shoplifting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693092A (en) * 1901-07-19 1902-02-11 Franklin K Young Electric hose-signal system.
US3297889A (en) * 1964-01-15 1967-01-10 Breskend Sam Clock driver
US3444547A (en) * 1965-10-08 1969-05-13 Gefco Mfg Corp Anti-shoplifting device
US3425050A (en) * 1965-10-12 1969-01-28 Continental Instr Corp Theft-preventing alarm device

Cited By (124)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952739A (en) * 1974-10-21 1976-04-27 Airco, Inc. Fail safe system for a patient triggered respirator
US4023073A (en) * 1975-12-08 1977-05-10 Graco Inc. Open circuit detector
DE3302321A1 (en) * 1982-11-13 1984-05-17 Drägerwerk AG, 2400 Lübeck MONITORING DEVICE FOR MEDICAL DEVICES
US20020124848A1 (en) * 1987-06-26 2002-09-12 Sullivan Colin Edward Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US20070051371A1 (en) * 1987-06-26 2007-03-08 Sullivan Colin E Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US7141021B2 (en) 1987-06-26 2006-11-28 Resmed Limited Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US6635021B1 (en) 1987-06-26 2003-10-21 Resmed Limited Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US20050283089A1 (en) * 1987-06-26 2005-12-22 Colin Sullivan Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US7004908B2 (en) 1987-06-26 2006-02-28 Resmed Limited Method and apparatus useful in the diagnosis of obstructive sleep apnea of a patient
US5134248A (en) * 1990-08-15 1992-07-28 Advanced Temperature Devices, Inc. Thin film flexible electrical connector
US5320092A (en) * 1991-08-05 1994-06-14 Ryder Steven L Fluid delivery apparatus with alarm
US6629527B1 (en) 1991-10-17 2003-10-07 Respironics, Inc. Sleep apnea treatment apparatus
US5970975A (en) * 1991-11-01 1999-10-26 Respironics, Inc. Sleep apnea treatment apparatus
US7013892B2 (en) 1991-11-01 2006-03-21 Ric Investments, Llc Sleep apnea treatment apparatus
US7770578B2 (en) 1991-11-01 2010-08-10 Ric Investments, Llc Sleep apnea treatment apparatus
US20060118112A1 (en) * 1991-11-01 2006-06-08 Ric Investments, Llc Sleep apnea treatment apparatus
US20040016433A1 (en) * 1991-11-01 2004-01-29 Respironics, Inc. Sleep apnea treatment apparatus
US5715812A (en) * 1992-12-09 1998-02-10 Nellcor Puritan Bennett Compliance meter for respiratory therapy
US5517983A (en) * 1992-12-09 1996-05-21 Puritan Bennett Corporation Compliance meter for respiratory therapy
US5626129A (en) * 1993-04-02 1997-05-06 Josef Klimm Device for monitoring at least one connection in a medical tubing system
WO1994022516A1 (en) * 1993-04-02 1994-10-13 Josef Klimm Device for monitoring at least one connection in a medical tubing system
US7730886B2 (en) 1993-11-05 2010-06-08 Resmed Limited Determination of patency of the airway
US6029665A (en) * 1993-11-05 2000-02-29 Resmed Limited Determination of patency of airway
US20040123866A1 (en) * 1993-11-05 2004-07-01 Michael Berthon-Jones Determination of patency of the airway
US8381722B2 (en) 1993-11-05 2013-02-26 Resmed Limited Distinguishing between closed and open airway apneas and treating patients accordingly
US20080163873A1 (en) * 1993-11-05 2008-07-10 Michael Berthon-Jones Determination of patency of the airway
US20110011402A1 (en) * 1993-11-05 2011-01-20 Michael Berthon-Jones Distinguishing between closed and open airway apneas and treating patients accordingly
US8360060B2 (en) 1993-11-05 2013-01-29 Resmed Limited Distinguishing between closed and open airway apneas and treating patients accordingly
US7320320B2 (en) 1993-11-05 2008-01-22 Resmed Limited Determination of patency of the airway
US8752547B2 (en) 1993-11-05 2014-06-17 Resmed Limited Distinguishing between closed and open airway apneas and treating patients accordingly
US6138675A (en) * 1993-11-05 2000-10-31 Resmed Ltd. Determination of the occurrence of an apnea
US20100242965A1 (en) * 1993-11-05 2010-09-30 Michael Berthon-Jones Distinguishing between closed and open airway apneas and treating patients accordingly
US6240921B1 (en) 1993-12-01 2001-06-05 Resmed, Ltd. Automated stop/start control in the administration of CPAP treatment
EP0661071A1 (en) * 1993-12-01 1995-07-05 Resmed Limited Device for continuous positive airway pressure breathing (CPAP)
US5492110A (en) * 1994-12-23 1996-02-20 Golden West Communications Switched alert circuit for fireman's breathing system
US6091973A (en) * 1995-04-11 2000-07-18 Resmed Limited Monitoring the occurrence of apneic and hypopneic arousals
US6363270B1 (en) 1995-04-11 2002-03-26 Resmed Limited Monitoring the occurrence of apneic and hypopneic arousals
US5661231A (en) * 1995-05-12 1997-08-26 Instrumentarium Oy Arrangement for leak testing place in connection with a ventilator
EP0742027A3 (en) * 1995-05-12 1997-03-26 Instrumentarium Oy Arrangement for leak testing taking place in connection with a ventilator
EP0742027A2 (en) * 1995-05-12 1996-11-13 Instrumentarium Oy Arrangement for leak testing taking place in connection with a ventilator
US6155986A (en) * 1995-06-08 2000-12-05 Resmed Limited Monitoring of oro-nasal respiration
US6237592B1 (en) 1995-07-03 2001-05-29 Resmed Limited Auto-calibration of pressure transducer offset
US6332463B1 (en) 1995-09-15 2001-12-25 Resmed Limited Flow estimation and compensation of flow-induced pressure swings in CPAP treatment and assisted respiration
US6526974B1 (en) 1995-09-18 2003-03-04 John William Ernest Brydon Pressure control in CPAP treatment or assisted respiration
US6182657B1 (en) 1995-09-18 2001-02-06 Resmed Limited Pressure control in CPAP treatment or assisted respiration
US6213119B1 (en) 1995-10-23 2001-04-10 Resmed Limited Inspiratory duration in CPAP or assisted respiration treatment
US6253764B1 (en) 1996-05-08 2001-07-03 Resmed, Ltd. Control of delivery pressure in CPAP treatment or assisted respiration
US7109731B2 (en) 1996-08-08 2006-09-19 Cascade Microtech, Inc. Membrane probing system with local contact scrub
US7893704B2 (en) 1996-08-08 2011-02-22 Cascade Microtech, Inc. Membrane probing structure with laterally scrubbing contacts
US7541821B2 (en) 1996-08-08 2009-06-02 Cascade Microtech, Inc. Membrane probing system with local contact scrub
US6279569B1 (en) 1996-08-14 2001-08-28 Resmed Limited Determination of leak and respiratory airflow
US6152129A (en) * 1996-08-14 2000-11-28 Resmed Limited Determination of leak and respiratory airflow
US6532957B2 (en) 1996-09-23 2003-03-18 Resmed Limited Assisted ventilation to match patient respiratory need
US7644713B2 (en) 1996-09-23 2010-01-12 Resmed Limited Method and apparatus for determining instantaneous leak during ventilatory assistance
US8051853B2 (en) 1996-09-23 2011-11-08 Resmed Limited Method and apparatus for providing ventilatory assistance
US8733351B2 (en) 1996-09-23 2014-05-27 Resmed Limited Method and apparatus for providing ventilatory assistance
US6810876B2 (en) 1996-09-23 2004-11-02 Resmed Ltd. Assisted ventilation to match patient respiratory need
US9974911B2 (en) 1996-09-23 2018-05-22 Resmed Limited Method and apparatus for providing ventilatory assistance
US6688307B2 (en) 1996-09-23 2004-02-10 Resmed Limited Methods and apparatus for determining instantaneous elastic recoil and assistance pressure during ventilatory support
US6029660A (en) * 1996-12-12 2000-02-29 Resmed Limited Substance delivery apparatus
USRE39225E1 (en) * 1997-03-14 2006-08-08 Nellcor Puritan Bennett Incorporated System and method for adjustable disconnection sensitivity for disconnection and occlusion detection in a patient ventilator
US5881717A (en) * 1997-03-14 1999-03-16 Nellcor Puritan Bennett Incorporated System and method for adjustable disconnection sensitivity for disconnection and occlusion detection in a patient ventilator
US6668824B1 (en) 1997-03-14 2003-12-30 Nellcor Puritan Bennett Incorporated System and method for adjustable disconnection sensitivity for disconnection and occlusion detection in a patient ventilator
US6397841B1 (en) 1997-06-18 2002-06-04 Resmed Limited Apparatus for supplying breathable gas
US6367474B1 (en) 1997-11-07 2002-04-09 Resmed Limited Administration of CPAP treatment pressure in presence of APNEA
US9526855B2 (en) 1997-11-07 2016-12-27 Resmed Limited Administration of CPAP treatment pressure in presence of apnea
US8684000B2 (en) 1997-11-07 2014-04-01 Resmed Limited Administration of CPAP treatment pressure in presence of apnea
US8451017B2 (en) 1998-07-14 2013-05-28 Cascade Microtech, Inc. Membrane probing method using improved contact
US7681312B2 (en) 1998-07-14 2010-03-23 Cascade Microtech, Inc. Membrane probing system
US6269811B1 (en) 1998-11-13 2001-08-07 Respironics, Inc. Pressure support system with a primary and a secondary gas flow and a method of using same
US6226165B1 (en) 1999-04-14 2001-05-01 Dell Usa, L.P. System and method for securing a computer system
US6161877A (en) * 1999-05-25 2000-12-19 Applied Materials, Inc. Conduit interlock assembly
US7533462B2 (en) 1999-06-04 2009-05-19 Cascade Microtech, Inc. Method of constructing a membrane probe
US20080252316A1 (en) * 2000-02-25 2008-10-16 Cascade Microtech, Inc. Membrane probing system
US7403025B2 (en) 2000-02-25 2008-07-22 Cascade Microtech, Inc. Membrane probing system
US6386196B1 (en) * 2000-03-13 2002-05-14 Steven E. Culton Warning device for oxygen delivery system failure
US7492175B2 (en) 2001-08-21 2009-02-17 Cascade Microtech, Inc. Membrane probing system
US20030213490A1 (en) * 2002-05-20 2003-11-20 Sim Italia S.R.L. Apparatus for controlling the dispensing of medical gases, particularly for assisting respiration
US20070173099A1 (en) * 2002-06-25 2007-07-26 Resmed Limited Method and apparatus for control of appliance coupler retention and withdrawal forces
US6679432B1 (en) * 2002-08-08 2004-01-20 Arizant Healthcare Inc. Audible indication of disconnection between a convective device and an air hose in a convective warming system
US8978649B2 (en) 2002-08-29 2015-03-17 Resmed Paris Sas Breathing assistance device with several secure respirator modes and associated method
US20070000491A1 (en) * 2002-08-29 2007-01-04 Philippe Chalvignac Breathing assistance device with serveral secure repirator modes and associated method
US8381725B2 (en) 2002-08-29 2013-02-26 Resmed Paris Breathing assistance device with several secure respirator modes and associated method
US20110139153A1 (en) * 2002-08-29 2011-06-16 Resmed Paris Breathing assistance device with several secure respirator modes and associated method
US7891353B2 (en) * 2002-08-29 2011-02-22 Resmed Paris Breathing assistance device with several secure respirator modes and associated method
US7514944B2 (en) 2004-07-07 2009-04-07 Cascade Microtech, Inc. Probe head having a membrane suspended probe
US7984712B2 (en) * 2004-10-25 2011-07-26 Bird Products Corporation Patient circuit disconnect system for a ventilator and method of detecting patient circuit disconnect
US20060086357A1 (en) * 2004-10-25 2006-04-27 Soliman Ihab S Patient circuit disconnect system for a ventilator and method of detecting patient circuit disconnect
US8322339B2 (en) 2006-09-01 2012-12-04 Nellcor Puritan Bennett Llc Method and system of detecting faults in a breathing assistance device
US9649458B2 (en) 2008-09-30 2017-05-16 Covidien Lp Breathing assistance system with multiple pressure sensors
US20100078024A1 (en) * 2008-09-30 2010-04-01 Nellcor Puritan Bennett Llc Breathing assistance system with multiple pressure sensors
US8302602B2 (en) 2008-09-30 2012-11-06 Nellcor Puritan Bennett Llc Breathing assistance system with multiple pressure sensors
US7888957B2 (en) 2008-10-06 2011-02-15 Cascade Microtech, Inc. Probing apparatus with impedance optimized interface
US9429638B2 (en) 2008-11-21 2016-08-30 Cascade Microtech, Inc. Method of replacing an existing contact of a wafer probing assembly
US8410806B2 (en) 2008-11-21 2013-04-02 Cascade Microtech, Inc. Replaceable coupon for a probing apparatus
US10267848B2 (en) 2008-11-21 2019-04-23 Formfactor Beaverton, Inc. Method of electrically contacting a bond pad of a device under test with a probe
US8844537B1 (en) 2010-10-13 2014-09-30 Michael T. Abramson System and method for alleviating sleep apnea
US9763767B2 (en) 2010-10-13 2017-09-19 Michael T. Abramson System and method for alleviating sleep apnea
US11612712B2 (en) 2011-09-12 2023-03-28 ResMed Pty Ltd Modularized respiratory treatment apparatus
US9302066B2 (en) * 2011-09-12 2016-04-05 Resmed Limited Modularized respiratory treatment apparatus
US20160158478A1 (en) * 2011-09-12 2016-06-09 Resmed Limited Modularized respiratory treatment apparatus
US10596341B2 (en) * 2011-09-12 2020-03-24 ResMed Pty Ltd Modularized respiratory treatment apparatus
US20130239960A1 (en) * 2011-09-12 2013-09-19 Resmed Limited Modularized respiratory treatment apparatus
US10195379B2 (en) * 2012-03-06 2019-02-05 Koninklijke Philips N.V. Patient interface having illuminated portion
US20150040896A1 (en) * 2012-03-06 2015-02-12 Koninklijke Philips N.V. Patient interface having illuminated portion
US20140014095A1 (en) * 2012-07-11 2014-01-16 Nellcor Puritan Bennett Llc Tracheal tube with inner cannula indication system
US10953173B2 (en) * 2014-03-11 2021-03-23 Oscar Bellosillo System for alarm-monitoring patients on continuous free flow oxygen delivery via T-piece on closed tracheal suction system
US20190134327A1 (en) * 2014-03-11 2019-05-09 Edrine Pineda Buenafe System For Alarm-Monitoring Patients On Continuous Free Flow Oxygen Delivery Via T-Piece On Closed Tracheal Suction System
US20150306323A1 (en) * 2014-03-11 2015-10-29 Edrine Pineda Buenafe System For Alarm-Monitoring Patients On Continuous Free Flow Oxygen Delivery Via T-Piece On Closed Tracheal Suction System
US10039891B2 (en) * 2014-03-11 2018-08-07 Edrine Pineda Buenafe System for alarm-monitoring patients on continuous free flow oxygen delivery via T-piece on closed tracheal suction system
US9592353B2 (en) * 2015-04-30 2017-03-14 Sanjay K Roy Adaptor/tubing with alarm(s)
US10741040B2 (en) * 2015-10-07 2020-08-11 Michael D. Velez Flow alarm
US9773393B2 (en) 2015-10-07 2017-09-26 Michael D. Velez Flow alarm
US20190213859A1 (en) * 2015-10-07 2019-07-11 Michael D. Velez Flow alarm
US10573150B2 (en) * 2015-10-07 2020-02-25 Michael D. Velez Flow alarm
US9788583B1 (en) 2016-06-20 2017-10-17 Innovations Unlimited, LLC Medical tube safety device
WO2018064471A1 (en) * 2016-09-29 2018-04-05 The Regents Of The University Of California Tracheotomy tube-based monitoring systems and methods
US20190232004A1 (en) * 2016-09-29 2019-08-01 The Regents Of The University Of California Tracheotomy Tube-Based Monitoring Systems And Methods
US11690966B2 (en) * 2016-09-29 2023-07-04 The Regents Of The University Of California Tracheotomy tube-based monitoring systems and methods
USD887548S1 (en) 2018-09-10 2020-06-16 Masimo Corporation Flow alarm device housing
USD887549S1 (en) 2018-09-10 2020-06-16 Masino Corporation Cap for a flow alarm device
USD908213S1 (en) 2018-09-10 2021-01-19 Masimo Corporation Wingnut for a flow alarm device
USD917046S1 (en) 2018-09-10 2021-04-20 Masimo Corporation Cap for a flow alarm device
US11890413B2 (en) 2019-11-14 2024-02-06 Innovations Unlimited, LLC Trachcollar safety alarm

Similar Documents

Publication Publication Date Title
US3595228A (en) Flow line break alarm device
US3508235A (en) Combined diaper fastener and signalling device
US4895160A (en) Apparatus for measuring the life functions of a human being, particularly an infant
US3996922A (en) Flexible force responsive transducer
US3939360A (en) Liquid level sensor and electrode assembly therefor
US5626129A (en) Device for monitoring at least one connection in a medical tubing system
US3812861A (en) Disposable electrode
US4558309A (en) Ground tether continuity monitor
US3760794A (en) Respiration monitoring apparatus and method
JP4162813B2 (en) Iontophoresis device
US3706008A (en) Body current activated circuit breaker
GB1288125A (en)
ATE263598T1 (en) DEVICE FOR ELECTROTHERAPY
US3832993A (en) Blood detecting device
US6924740B2 (en) Electrical resistance monitoring device
GB1042846A (en) A pressure monitor for use with artificial breathing apparatus
EP0483150B1 (en) Acupuncture locating device
US3895367A (en) Gas indicator with semiconductive gas sensor
US3468302A (en) Skin resistance reaction time testing apparatus
US3678491A (en) Instrument power-disconnect alarm
CN208014113U (en) A kind of induction-type high-voltage electric alarm circuit
CN1095578A (en) Sleep stifling auto-alarm first-aid device
US5434561A (en) Remote audio/visual alarm apparatus
CN201239378Y (en) Intelligent transfusion apparatus with alarm
JPS58183143A (en) Respiration monitor