CA1129781A - Stethoscope with probe sound pick-up and resonant cavity amplification - Google Patents
Stethoscope with probe sound pick-up and resonant cavity amplificationInfo
- Publication number
- CA1129781A CA1129781A CA354,447A CA354447A CA1129781A CA 1129781 A CA1129781 A CA 1129781A CA 354447 A CA354447 A CA 354447A CA 1129781 A CA1129781 A CA 1129781A
- Authority
- CA
- Canada
- Prior art keywords
- sound
- pick
- head
- diaphragm
- tube
- 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
Links
- 239000000523 sample Substances 0.000 title claims abstract description 34
- 230000003321 amplification Effects 0.000 title claims abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 5
- 210000004072 lung Anatomy 0.000 claims abstract description 3
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 5
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 239000011797 cavity material Substances 0.000 description 29
- 210000005069 ears Anatomy 0.000 description 4
- 230000000994 depressogenic effect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 210000003709 heart valve Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- BALXUFOVQVENIU-KXNXZCPBSA-N pseudoephedrine hydrochloride Chemical compound [H+].[Cl-].CN[C@@H](C)[C@@H](O)C1=CC=CC=C1 BALXUFOVQVENIU-KXNXZCPBSA-N 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
Abstract
IN THE UNITED STATES PATENT AND TRADEMARK OFFICE
STETHOSCOPE WITH PROBE SOUND PICK-UP
AND RESONANT CAVITY AMPLIFICATION
ABSTRACT OF THE DISCLOSURE
A stethoscope having one or more resonant cavities adjusted to amplify sound frequencies of interest, such as those of the heart or lungs of a patient, and including a pick-up head that contacts the patient through a probe.
STETHOSCOPE WITH PROBE SOUND PICK-UP
AND RESONANT CAVITY AMPLIFICATION
ABSTRACT OF THE DISCLOSURE
A stethoscope having one or more resonant cavities adjusted to amplify sound frequencies of interest, such as those of the heart or lungs of a patient, and including a pick-up head that contacts the patient through a probe.
Description
7~
~ACKGR~UND OF THE INVENTION
This invention xelates to stethoscopes and principally to improvements therein for increased amplitude and quality of monitored sounds.
The stethoscope has been a basic tool of medical diagnosis from since the early part of the Nineteenth Century.
The history of the stethoscope has been outlined in a recent article, Scientific American, February, 1979, beginning at page 148. Despite numerous advances in the electronic medical and clinical diagnostic equipment, the stethoscope remains to be a widely used instrument.
It is a principal object of the present invention to provide an improved stethoscope wherein the user can hear patient's sounds of interest with improved clarity and volume.
_UMM~R~ ~F THE INVENTIO~
Broadly speaking the present invention provides a method of monitoring sounds interna~ly generated in a body, such as heart and lung sounds, comprising the steps of: holding a bluntly pointed probe against the outside of the body, whereby it vibrates according to the sound vibrations within the body, generating sound waves in an enclosed air chamber from the vibrating probe through a diaphragm that is attached to the probe, communicating the sound waves to a sound detector, such as a human ear, from the enclosed air chamber, and simultaneously communica-ting the sound waves from the enclosed air chamber to one end of a hollow resonant tube that is open to the atmosphere at its other end, whereby the detected sounds are amplified.
The above method may be carried out by apparatus which includes in a stethoscope having a sound pick-up head and at least sd/CJ~
?~
t ~ t~7 ~ ~
one ear piece that axe c~mlectecl a-t opposite ends of an enclosed sound transmission passage therebetween, the improvement comprising an elong-a-ted resonant cavity oE a given volume connected at one end to the enclosed sound -trc~nsmission passage in the vicinity of the pick-up head and opened to the atmosphere a dis-tance fram the one end, thereby allowing sound waves from the pick-up head to simultaneously pass through both the resonant cavity and the enclosed passage, whexeby the resonant cavity causes sound frequencies within a given resonan-t frequency range dependent upon the cavity distance to be amplified between the pick-up head and the ear piece.
Other advantages and features oE the various aspects of the present invention will become apparent from -the following description of a preferred em~cdiment thereof, which description should be.taken in conjunction with the accompanying drawings.
RIEF DESC.RI~l'ION OF T~E DR~WINGS
Figure 1 shows a stethoscope incorporating the resonant cavity and pick-up head improvements of the present inven-tion;
Figure 2 is a cutaway view of a portion of the stethoscope of Figure 1 taken at section 2-2;
Figures 3A, 3B and 3C shcw three operable positi~ns of an element of the improved stethosoope of Figure 1 as viewed frcm section 3-3 of Figure 2;
Figures 4A and 4B illustrate the operation of another element of the improved stethoscope of Figure 1 taken at section 2-2 thereof;
Figure 5 shows another embodiment of the present inven-tion wherein the reson~nt cavity improvemen-t is incorporated into an existing stethoscope;
~ - 2 -, Figures 6A and 6B illustrate in cross-sectlon the operation of a valve of the embodimen-t of Figure 5;
Figure 7, appearlng on the same sheet as Figure 4A, shows a variation of the embodiment of Figures 5, 6A and 6B; and Figure 8 shows in cross-section yet another embodiment of a pick-up head with resonant cavity according to the present invention.
~' ' .
sd/CS~I -2A-~ 7~
l DES~RIPTION or ~ p~FEnRF~D ~ODIM~,NT
~ACKGR~UND OF THE INVENTION
This invention xelates to stethoscopes and principally to improvements therein for increased amplitude and quality of monitored sounds.
The stethoscope has been a basic tool of medical diagnosis from since the early part of the Nineteenth Century.
The history of the stethoscope has been outlined in a recent article, Scientific American, February, 1979, beginning at page 148. Despite numerous advances in the electronic medical and clinical diagnostic equipment, the stethoscope remains to be a widely used instrument.
It is a principal object of the present invention to provide an improved stethoscope wherein the user can hear patient's sounds of interest with improved clarity and volume.
_UMM~R~ ~F THE INVENTIO~
Broadly speaking the present invention provides a method of monitoring sounds interna~ly generated in a body, such as heart and lung sounds, comprising the steps of: holding a bluntly pointed probe against the outside of the body, whereby it vibrates according to the sound vibrations within the body, generating sound waves in an enclosed air chamber from the vibrating probe through a diaphragm that is attached to the probe, communicating the sound waves to a sound detector, such as a human ear, from the enclosed air chamber, and simultaneously communica-ting the sound waves from the enclosed air chamber to one end of a hollow resonant tube that is open to the atmosphere at its other end, whereby the detected sounds are amplified.
The above method may be carried out by apparatus which includes in a stethoscope having a sound pick-up head and at least sd/CJ~
?~
t ~ t~7 ~ ~
one ear piece that axe c~mlectecl a-t opposite ends of an enclosed sound transmission passage therebetween, the improvement comprising an elong-a-ted resonant cavity oE a given volume connected at one end to the enclosed sound -trc~nsmission passage in the vicinity of the pick-up head and opened to the atmosphere a dis-tance fram the one end, thereby allowing sound waves from the pick-up head to simultaneously pass through both the resonant cavity and the enclosed passage, whexeby the resonant cavity causes sound frequencies within a given resonan-t frequency range dependent upon the cavity distance to be amplified between the pick-up head and the ear piece.
Other advantages and features oE the various aspects of the present invention will become apparent from -the following description of a preferred em~cdiment thereof, which description should be.taken in conjunction with the accompanying drawings.
RIEF DESC.RI~l'ION OF T~E DR~WINGS
Figure 1 shows a stethoscope incorporating the resonant cavity and pick-up head improvements of the present inven-tion;
Figure 2 is a cutaway view of a portion of the stethoscope of Figure 1 taken at section 2-2;
Figures 3A, 3B and 3C shcw three operable positi~ns of an element of the improved stethosoope of Figure 1 as viewed frcm section 3-3 of Figure 2;
Figures 4A and 4B illustrate the operation of another element of the improved stethoscope of Figure 1 taken at section 2-2 thereof;
Figure 5 shows another embodiment of the present inven-tion wherein the reson~nt cavity improvemen-t is incorporated into an existing stethoscope;
~ - 2 -, Figures 6A and 6B illustrate in cross-sectlon the operation of a valve of the embodimen-t of Figure 5;
Figure 7, appearlng on the same sheet as Figure 4A, shows a variation of the embodiment of Figures 5, 6A and 6B; and Figure 8 shows in cross-section yet another embodiment of a pick-up head with resonant cavity according to the present invention.
~' ' .
sd/CS~I -2A-~ 7~
l DES~RIPTION or ~ p~FEnRF~D ~ODIM~,NT
2 Referring initially to Figure 1, the basie elements of ,~
3 the improved stethoscope will be described. A sound piek-up
4 ¦head 11 includes a diaphragm 13 stretehed there aeross with a probe 15 attaehed to its eenter and extending outward of the ,' 6 piek-up head 11 for contacting a patient and being vibrated in ¦accordanee with sounds within the patient. These sounds c,aus,~
8 the diaphragm 13 to vibrate for eo~munieating the sounds through a tube 17 to ear pieees 19 and 21. The tube 17 splits 10 linto two tubes 23 and 25, as in existing stethoseopes, for Il ¦comrnunicating sound to hollow metal conduits 27 and 29, respee-12 tively. Also as in existing stethoscopes, a spring support 13 ¦piece 31 is connected between the metal tubes 27 and 29 for ¦applying pressure of the ear pieces 19 and 21 to the wearer's 16 ears when in use. As in existing stethoscopes, the hollow 17 tubular sound earrying air passage 17 is eomn~unieated with the ear pieees 1~ and 21 without any interruption, bloekage or 18 opening therein outside of the pick-up head 11.
The improved stethoscope of the present invention includes 21 a first resonant cavity 33 and a second resonant cavity 35 whieh ' ¦are seleetively eonneeted to the sound passage 17 on the baek of , 2223 the pick~up head 11, as described hereinaft;er. ~ach of the 24 resonant cavi-ties 33 and 35 is a hollow~tube of differing lengths.', 25 The cavity 33 is a tube which ends and is open to the atmosphere 26 at a posi.tion 37. The tube 35 is longer and ends at a position 27 I39 by opening into the atrnosphere. ~ sheath ~1 eonveniently 28 wraps around all three tubes 17, 33 and 35 to ~3ive an aesthetie appearanee.
30 // , , 31 // , l!
, _ 3 _ . ....... _ _ _ __. _ .. .
~' '' ' ., ' . ~
.
~ J~
~ !
1 The resonant cavi~y tu~es 33 and 35 have a length to 2 maximize amplification of the sound frequencies within two 3 sound frequency ranges of interest. The shorter tube 33 is shown in this embodiment to be in the range of from seven to S nine inches long measured between the point of its connection to 6 the passage 17 and its end 37. This has been found to maximize 7 lung soundsO The tube 35, designed to maximize sounds from the 8 heart of a patient, is preferably made of the length from two 9 to three feet. In both cases, tubing with an inside diameter of approximately 5/32 inch is preferred. However, it will be 11 recognized that other forms and shapes of resonant cavities 12 could be utilized but the tubing does have the advantage of 13 being simple, economical and easily adaptable to exis-ting 14 stethoscope designs.
The use of resonant cavities according to the present 6 invent:ion has a ~urther advant.lge, in addition to accentu..'cing the sounds oE interest, of preventing loud sounds which will 18 annoy or injure the ears of the user while manipulating the 19 pick-up head by hand. These large disturbances create pressure 2l waves which are vented to the atmosphere through the resonant 22 cavity rather than being directed to the ears of the userO
24 // .
25 // . !
. ' ~ 4 _ _ . .. _ __ . .. . .
.. , .. . -- . ~
` ~ d.;~
.' 1.
1 Referring to Figures 2 through ~, the structure of o (/y /`~
2 the pick-up head 11 for this example e~be~Lng the various aspects 3 of the invention will be described. A base member 41 has a 4 circular outer flanqe 43 threadedly attached thereto in a manner to securely hold the outer circumference of a circular diaphragm ', 6 13 thereto. Of course, the diaphragm 13 and flange ~3 do not 7 necessarily have to be circular in shape but this is the most i~
8 convenient to manufacture. 1`
~ The sound waves generated by vibration of the diaphragm 13 within a cavity 45 pass through an aperture 47 located in a 11 wall of the cavity 45 opposite the diaphragm 13. The sound 12 waves are then passed into a rigid tube 49 about which an end 13 of the sound passage flexible tube 17 is tightly force fittedO
14 The sound waves then travel throuc3h the hollow tube 17 to the 15 ear pieces 19 and 21.
16 Upriyht riqid tubcs Sl and 53 are also provided ~or 17 Eorcc ~itting there around o~ the flexible resonant cavity tubes la 33 and 35. The tubes 51 and 53 are selectively connected for 19 sound communication with the aperture 47 through a sliding valve 5' .
20 The valve 55 includes a passage 57 that is selectively positioned.
21 In the position shown in Figure 3A, neither of the -tubes 51 or 22 53 are in sound communication with the aperture 47 or the sound 23 passage 17. When the valve 55 is manually slid to one extreme 2~ position, as shown in Figure 3B, the passage 57 connects the 25 resonant cavity tube 33 with th~ aperture 47 and the sound 26 passage 17. When the valve knob 55 is slid to an opposite 27 extrcme position, as shown in Figure 3C, the valve passage 57 28 -then connects the resonant cavity tube 35 to receive sound waves 29 in air ~rom the aperature ~7 and the sound passage 17. Therefore, 3 either the sound resonant cavity 33 or the sound resonant cavity 31 35, or neither, are selectively connected to the sound passage 17 3 at the rear o~ the sound plck-~p head 11 in order to obtaln the ~.
~ t'~
l desired performance from the stethoscope for a given patient 2 examination 3 The valve 55 is held at one of its three stable positions 4 by a ball detent 61 that is urged upward by a spring 63 captured
8 the diaphragm 13 to vibrate for eo~munieating the sounds through a tube 17 to ear pieees 19 and 21. The tube 17 splits 10 linto two tubes 23 and 25, as in existing stethoseopes, for Il ¦comrnunicating sound to hollow metal conduits 27 and 29, respee-12 tively. Also as in existing stethoscopes, a spring support 13 ¦piece 31 is connected between the metal tubes 27 and 29 for ¦applying pressure of the ear pieces 19 and 21 to the wearer's 16 ears when in use. As in existing stethoscopes, the hollow 17 tubular sound earrying air passage 17 is eomn~unieated with the ear pieees 1~ and 21 without any interruption, bloekage or 18 opening therein outside of the pick-up head 11.
The improved stethoscope of the present invention includes 21 a first resonant cavity 33 and a second resonant cavity 35 whieh ' ¦are seleetively eonneeted to the sound passage 17 on the baek of , 2223 the pick~up head 11, as described hereinaft;er. ~ach of the 24 resonant cavi-ties 33 and 35 is a hollow~tube of differing lengths.', 25 The cavity 33 is a tube which ends and is open to the atmosphere 26 at a posi.tion 37. The tube 35 is longer and ends at a position 27 I39 by opening into the atrnosphere. ~ sheath ~1 eonveniently 28 wraps around all three tubes 17, 33 and 35 to ~3ive an aesthetie appearanee.
30 // , , 31 // , l!
, _ 3 _ . ....... _ _ _ __. _ .. .
~' '' ' ., ' . ~
.
~ J~
~ !
1 The resonant cavi~y tu~es 33 and 35 have a length to 2 maximize amplification of the sound frequencies within two 3 sound frequency ranges of interest. The shorter tube 33 is shown in this embodiment to be in the range of from seven to S nine inches long measured between the point of its connection to 6 the passage 17 and its end 37. This has been found to maximize 7 lung soundsO The tube 35, designed to maximize sounds from the 8 heart of a patient, is preferably made of the length from two 9 to three feet. In both cases, tubing with an inside diameter of approximately 5/32 inch is preferred. However, it will be 11 recognized that other forms and shapes of resonant cavities 12 could be utilized but the tubing does have the advantage of 13 being simple, economical and easily adaptable to exis-ting 14 stethoscope designs.
The use of resonant cavities according to the present 6 invent:ion has a ~urther advant.lge, in addition to accentu..'cing the sounds oE interest, of preventing loud sounds which will 18 annoy or injure the ears of the user while manipulating the 19 pick-up head by hand. These large disturbances create pressure 2l waves which are vented to the atmosphere through the resonant 22 cavity rather than being directed to the ears of the userO
24 // .
25 // . !
. ' ~ 4 _ _ . .. _ __ . .. . .
.. , .. . -- . ~
` ~ d.;~
.' 1.
1 Referring to Figures 2 through ~, the structure of o (/y /`~
2 the pick-up head 11 for this example e~be~Lng the various aspects 3 of the invention will be described. A base member 41 has a 4 circular outer flanqe 43 threadedly attached thereto in a manner to securely hold the outer circumference of a circular diaphragm ', 6 13 thereto. Of course, the diaphragm 13 and flange ~3 do not 7 necessarily have to be circular in shape but this is the most i~
8 convenient to manufacture. 1`
~ The sound waves generated by vibration of the diaphragm 13 within a cavity 45 pass through an aperture 47 located in a 11 wall of the cavity 45 opposite the diaphragm 13. The sound 12 waves are then passed into a rigid tube 49 about which an end 13 of the sound passage flexible tube 17 is tightly force fittedO
14 The sound waves then travel throuc3h the hollow tube 17 to the 15 ear pieces 19 and 21.
16 Upriyht riqid tubcs Sl and 53 are also provided ~or 17 Eorcc ~itting there around o~ the flexible resonant cavity tubes la 33 and 35. The tubes 51 and 53 are selectively connected for 19 sound communication with the aperture 47 through a sliding valve 5' .
20 The valve 55 includes a passage 57 that is selectively positioned.
21 In the position shown in Figure 3A, neither of the -tubes 51 or 22 53 are in sound communication with the aperture 47 or the sound 23 passage 17. When the valve 55 is manually slid to one extreme 2~ position, as shown in Figure 3B, the passage 57 connects the 25 resonant cavity tube 33 with th~ aperture 47 and the sound 26 passage 17. When the valve knob 55 is slid to an opposite 27 extrcme position, as shown in Figure 3C, the valve passage 57 28 -then connects the resonant cavity tube 35 to receive sound waves 29 in air ~rom the aperature ~7 and the sound passage 17. Therefore, 3 either the sound resonant cavity 33 or the sound resonant cavity 31 35, or neither, are selectively connected to the sound passage 17 3 at the rear o~ the sound plck-~p head 11 in order to obtaln the ~.
~ t'~
l desired performance from the stethoscope for a given patient 2 examination 3 The valve 55 is held at one of its three stable positions 4 by a ball detent 61 that is urged upward by a spring 63 captured
5 within the base portion 41 of the sound pick-up head 11 ~ groovej
6 65 is provided along the length of the valve slide 55 and contains4
7 three indentations along this length cooperatively shaped with the
8 ball 61 for it to rest securely therein. The ball 61 is loose, being captured between the spring 63 and the valve slide 55. The 10 three positive valve positions are thereby provided by these three 11 indentations cooperating with the spring loaded ball 61. In 12 construction the valve slide 55 is inserted into the base portion 1 13 41 with the ball 61 pushed down out of the way by compressing the , 14 spring 63. Once so installed, the valve slide 55 cannot be 15 removed.
16 Referring to FicJures ~A and ~B, the operation oE the 17 di~phragm 13 and probe 15 can be better understood. When the 18 head of FicJure ~ is pushed ayainst a patient 67 in a manner ' 19 shown in Figure 4B, the probe 15 and diaphragm 13 are pushed 20 inward of the cavity 45, as clearly illustrated. Sound vibra- i 21 tions within the body 67 are then transmitted to the probe 15 22 which is in ~irm contact with the body and the diaphraym 13 is 23 then caused to vibrate and set up those sound waves within the 24 chamber ~5 which are -then communicated to a resonant cavity, if 25 any, and the ear pieces 19 and 21 as described previously. The 26 probe 15 is as sharp as possible Oll its outer end without being so 27 sharp as to cause discomfort to the patient. It is desired that 28 the probe contac~ be as small a point as possible so that the 29 sound waves at that single point are detected. This is an 30 improvement over a commonly used technique wherein a large area 31 membrane or diaphragm contacts the patient's skin directly.
,,, , . . .
- ( ~ ~?,~7~
I The large area sound pick-up has a disadvantage of integrating 2 the sound over the many points covered without providing a 3 sharp, clear sound as results from use of the probe 15 as 3 4 shown herein.
5 The diaphragm 13 is made to have maximum flexibility 6 in its outer annular ring 69 while an inner circular portion 71 7 to which theprobe 15 is firmly attached is less flexible. This is accomplished by the bends formed in the diaphragm 13 as best
16 Referring to FicJures ~A and ~B, the operation oE the 17 di~phragm 13 and probe 15 can be better understood. When the 18 head of FicJure ~ is pushed ayainst a patient 67 in a manner ' 19 shown in Figure 4B, the probe 15 and diaphragm 13 are pushed 20 inward of the cavity 45, as clearly illustrated. Sound vibra- i 21 tions within the body 67 are then transmitted to the probe 15 22 which is in ~irm contact with the body and the diaphraym 13 is 23 then caused to vibrate and set up those sound waves within the 24 chamber ~5 which are -then communicated to a resonant cavity, if 25 any, and the ear pieces 19 and 21 as described previously. The 26 probe 15 is as sharp as possible Oll its outer end without being so 27 sharp as to cause discomfort to the patient. It is desired that 28 the probe contac~ be as small a point as possible so that the 29 sound waves at that single point are detected. This is an 30 improvement over a commonly used technique wherein a large area 31 membrane or diaphragm contacts the patient's skin directly.
,,, , . . .
- ( ~ ~?,~7~
I The large area sound pick-up has a disadvantage of integrating 2 the sound over the many points covered without providing a 3 sharp, clear sound as results from use of the probe 15 as 3 4 shown herein.
5 The diaphragm 13 is made to have maximum flexibility 6 in its outer annular ring 69 while an inner circular portion 71 7 to which theprobe 15 is firmly attached is less flexible. This is accomplished by the bends formed in the diaphragm 13 as best
9 illustrated in the side cross-sectional view of Figure 4A. The
10 diaphragm 13 and probe 15 are preferahly formed from a single Il piece of sheet metalr Thè result lS that -the entire inner 12 circular portion 71 of the diaphragm 13 vibrates in accordance 13 with the sounds picked up from the patient through the probe 15.
14 This large vibrating area provides initial high volume sound 15 within the chamber 45. Yet, the diaphragm is resilient enough 16 in its outer portion 69 to enable it to urge the probe 15 firmly 1~ against the skin o~ a patient 67 as shown in Figure ~B. The 18 diaphragm 13 is positioned a distance inward of the lip 71 so 19 that, for a given length probe l5 and shape of the diaphragm 13, 20 the probe 15 is firmly held against the patient 67 when in use.
21 The lip 71 also provides a firm seating of the pick-up head 11 22 against the patient 67 which aids in preventing any movement of 23 the head 11 during an examination and reduces the influence of 24 extraneous noises and vibrations in addition to the sound desired~.
to be detected by th~ instru~ent. -26 A plurality of openings 73 and 75 are provided through 27 the flange ~3. These openings prevent a vacuum from forming 28 between the skin of the patient 67 and the diaphragm 13 when 29 the pick-up head is in use. Such a vacuum would be undesirable since it would interfere with free movement of the diaphragm 13 31 in accordance with the sounds picked up from the patient 67.
32 /f L?~
l Referring to Figure 5, another cmbodiment of the presen~
2 ¦ invention is illustratcd wherein a resonant tube and valve are 3 added to an existing stethoscope. A standard pick-up head 81 4 is employed, as are usual ear pieces 19' and 21', connected ;¦
respectively to metal tubes 27' and 29'. (The prime ['~
6 shows the equivalent parts to that of the embodiment of Figure 1) 7 Rather than a simple tube connected between the pick-up head 81 a ¦ and the ear -tubes 27' and 29', as is done with existing stetho-91 scopes, a tube structure 83 according to the present invention 'I is substituted. This structure includes an entrance tube portion ll 85 connected to receive sound vibrations fro~ the pic~-up head 81.
12 ¦ A mechanical valve 87 receives the sound waves through the tube ~31 85 and directs them either into a tube 89 or into both the tube '4I 89 and a resonant cavity tube 91. The tube 89 provides a closed 15¦ sound path to the ear piece tubes 27' and 29'. The tube 91 is 16¦ open to the atmosphcre, being mechanlcally conncctcd to the tube 17 89 for convenience and appearance.
lB ¦ Figures 6A and 6B illustrate in enlarged view operation -19 ¦of the valve 87 of Figure 5. A case 95 has a plunger 97 therein 20 ¦ that is sealed to the inside of the case 95. Both the inside 211 surface of the case 95 and the ou-tside surface of the plunger 97 22 ¦ are preferably cylindrical in shape and of mating si~es within 231 close tolerances~ A spring 99 within the cylin~rical cavity of 2~1 the case 95 urges the plunger 97 away from a plugged end 101 o~
25 the case and aga$nst the other end. A button 103 attached to the 26I plunger 97 extends outward of the other eIld of the case 95 and 27 1 when pushed urges the plunger 97 from a rest position of Figure 28¦ 6A -to an intermediate position of Figure 6B.
32 // - . .
, - 8 - 3 .
' ~ '71;.2 ~
1 The v~lve 87 of Figures 5, 6A and 6B is normally 2¦ positioned in the specific em~odiment being described so that 3 the resonant cavity 91 is connected into the sound transmission 4 passage provided by the tubes 8S and 39. The button 103 of the valve 87 is made just long enough so that when fully depressed, in a manner shown in Figure 6B, the plunger 97 closes off the~
7 resonant cavity sound passage 91 and converts the structure of Figure 5 into a normally operating stethoscope. However, with 9 1 the resonant cavity normally connected with the valve at rest as shown in Figures 5 and 6A, the stethoscope is set to respond with !
14 This large vibrating area provides initial high volume sound 15 within the chamber 45. Yet, the diaphragm is resilient enough 16 in its outer portion 69 to enable it to urge the probe 15 firmly 1~ against the skin o~ a patient 67 as shown in Figure ~B. The 18 diaphragm 13 is positioned a distance inward of the lip 71 so 19 that, for a given length probe l5 and shape of the diaphragm 13, 20 the probe 15 is firmly held against the patient 67 when in use.
21 The lip 71 also provides a firm seating of the pick-up head 11 22 against the patient 67 which aids in preventing any movement of 23 the head 11 during an examination and reduces the influence of 24 extraneous noises and vibrations in addition to the sound desired~.
to be detected by th~ instru~ent. -26 A plurality of openings 73 and 75 are provided through 27 the flange ~3. These openings prevent a vacuum from forming 28 between the skin of the patient 67 and the diaphragm 13 when 29 the pick-up head is in use. Such a vacuum would be undesirable since it would interfere with free movement of the diaphragm 13 31 in accordance with the sounds picked up from the patient 67.
32 /f L?~
l Referring to Figure 5, another cmbodiment of the presen~
2 ¦ invention is illustratcd wherein a resonant tube and valve are 3 added to an existing stethoscope. A standard pick-up head 81 4 is employed, as are usual ear pieces 19' and 21', connected ;¦
respectively to metal tubes 27' and 29'. (The prime ['~
6 shows the equivalent parts to that of the embodiment of Figure 1) 7 Rather than a simple tube connected between the pick-up head 81 a ¦ and the ear -tubes 27' and 29', as is done with existing stetho-91 scopes, a tube structure 83 according to the present invention 'I is substituted. This structure includes an entrance tube portion ll 85 connected to receive sound vibrations fro~ the pic~-up head 81.
12 ¦ A mechanical valve 87 receives the sound waves through the tube ~31 85 and directs them either into a tube 89 or into both the tube '4I 89 and a resonant cavity tube 91. The tube 89 provides a closed 15¦ sound path to the ear piece tubes 27' and 29'. The tube 91 is 16¦ open to the atmosphcre, being mechanlcally conncctcd to the tube 17 89 for convenience and appearance.
lB ¦ Figures 6A and 6B illustrate in enlarged view operation -19 ¦of the valve 87 of Figure 5. A case 95 has a plunger 97 therein 20 ¦ that is sealed to the inside of the case 95. Both the inside 211 surface of the case 95 and the ou-tside surface of the plunger 97 22 ¦ are preferably cylindrical in shape and of mating si~es within 231 close tolerances~ A spring 99 within the cylin~rical cavity of 2~1 the case 95 urges the plunger 97 away from a plugged end 101 o~
25 the case and aga$nst the other end. A button 103 attached to the 26I plunger 97 extends outward of the other eIld of the case 95 and 27 1 when pushed urges the plunger 97 from a rest position of Figure 28¦ 6A -to an intermediate position of Figure 6B.
32 // - . .
, - 8 - 3 .
' ~ '71;.2 ~
1 The v~lve 87 of Figures 5, 6A and 6B is normally 2¦ positioned in the specific em~odiment being described so that 3 the resonant cavity 91 is connected into the sound transmission 4 passage provided by the tubes 8S and 39. The button 103 of the valve 87 is made just long enough so that when fully depressed, in a manner shown in Figure 6B, the plunger 97 closes off the~
7 resonant cavity sound passage 91 and converts the structure of Figure 5 into a normally operating stethoscope. However, with 9 1 the resonant cavity normally connected with the valve at rest as shown in Figures 5 and 6A, the stethoscope is set to respond with !
11 ~ the loudest sounds possible. Also, with the resonant chamber
12 tube 91 normally connected, any bumping or otherAnoise caused
13 by handling of the pick-u~ 81 as it is moved to and from a
14 patient are prevented from reaching the ears of the user by .-venting them to the atmosphere through the oper~ resonant tube 91.
._ Rather than the pick-up head 81 of the standard 17 commercial variety, the improved pick~up head 11, as descr.ibed 18 with respect to Figures 1, ~A and 4B, (but without the valve . structure) can be substituted in the embodiment of Figures 5, 2 6~ and 6B. Such a combination provides the advantages of 21 both the resonant tubes and the probe sound pick-up in a ..si.ngle 22 structure. It may be of some advantage to users of the improved 2 stethoscope of the present invention to have.the valve 2 structure (if one is used) removed from the pick-up head a few.inches along the sound transmission tubeO
26 It has also been discovered as part of the prese.nt .
2 invention that the.connection of both resonant tubes 33 and 35 2 to the sound chamber 45 ~Figure l) results in an instrument 2 that allows the user to clearly and loudly hear high frequencies 3 associated with an improperly operating heart valve of a pa-tient.
31 Presently, only electronic instruments are capable of allo~ing 3 a doctor to listen to these sounds. To make possible thi.s .
.. , ' , ' , .
7~.?$
added feature, the valve of~the.Figure 1-4 embodiment can pe ? modiied (not shown) to pexmit both of the .tubes 33 andj 35 ~Q
3 be connected in addition .to the operator choices provided by 4 the valve as shown.
Such a valve structure is illustrated in Figure 7O
6 The valve 87' is designed to be substituted for the valve 37 of 'i 7 the embodiment of Figure 5, 6A and 6B. A second resonant tube 90 is selectively connectable to the sound path 85' by manual 9 operation of a second plunger 98 through an outwardly extending 10¦ pushbutton lOOo The two pushbuttons 103' and 100 are con- . ;
11 veniently located on opposite sides of the valve case 95' so the 12 ¦operator can depress one or both with fingers on a single hand.
13 When neither button is depressed, both resonant tubes 9L' and 90 14 are operably connected into the sound transmission path 85'.
._ Rather than the pick-up head 81 of the standard 17 commercial variety, the improved pick~up head 11, as descr.ibed 18 with respect to Figures 1, ~A and 4B, (but without the valve . structure) can be substituted in the embodiment of Figures 5, 2 6~ and 6B. Such a combination provides the advantages of 21 both the resonant tubes and the probe sound pick-up in a ..si.ngle 22 structure. It may be of some advantage to users of the improved 2 stethoscope of the present invention to have.the valve 2 structure (if one is used) removed from the pick-up head a few.inches along the sound transmission tubeO
26 It has also been discovered as part of the prese.nt .
2 invention that the.connection of both resonant tubes 33 and 35 2 to the sound chamber 45 ~Figure l) results in an instrument 2 that allows the user to clearly and loudly hear high frequencies 3 associated with an improperly operating heart valve of a pa-tient.
31 Presently, only electronic instruments are capable of allo~ing 3 a doctor to listen to these sounds. To make possible thi.s .
.. , ' , ' , .
7~.?$
added feature, the valve of~the.Figure 1-4 embodiment can pe ? modiied (not shown) to pexmit both of the .tubes 33 andj 35 ~Q
3 be connected in addition .to the operator choices provided by 4 the valve as shown.
Such a valve structure is illustrated in Figure 7O
6 The valve 87' is designed to be substituted for the valve 37 of 'i 7 the embodiment of Figure 5, 6A and 6B. A second resonant tube 90 is selectively connectable to the sound path 85' by manual 9 operation of a second plunger 98 through an outwardly extending 10¦ pushbutton lOOo The two pushbuttons 103' and 100 are con- . ;
11 veniently located on opposite sides of the valve case 95' so the 12 ¦operator can depress one or both with fingers on a single hand.
13 When neither button is depressed, both resonant tubes 9L' and 90 14 are operably connected into the sound transmission path 85'.
15 When the button 100 only is depressed, the tube 90 is cut-off and
16 only the tube 91' is connected. When the button 103' only is
17 ¦dcpressed, the tube 91' is cut-off and only the tube 90 is
18 connected. ~Ihen both buttons 100 and 103' are depress~d at the
19 ¦same time, the sound.passes.straight through rom the tube 85'
20 ¦to the tube 89' without either resonant tubes being connected.
21 ¦ The tubes 91 and 91' of the Figure 5-7 embodiment ?2 correspond in length to the larger resonant tube 35 of the .
23 Figure 1 embodiment. The tube 90 of Figure 7 is open ended .
24 and of the shorter length of the tube 33 of Figure 1.
25 // ; .
26 1~ - . .
278 // -:
29 // . .
30 // .
. - 10 -.
r7 ~
l~ Referring to Figure 8, a variation of the embodiment 2 of Figures 1 through 4 is illustrated. The diaphragm 13' and 3 probe 15' have the same structure, as does the cap 71' and the 4 air vent 73'. A different shaped pick-up case 107 is provided, however, in order to make room for a coiledAresonant tube 109 6 that is placed thereinO One end of the tube 109 opens into the t, 7 cavity 41' in which the sound waves are generated by vibration B o the membrane 13'. An opposite end 111 of the coiled tube 109 9 is open. The rigid tube 49' is also connected to the chamber 45' ~
and communicates the sound generated therein through a tube 113 t 11 to normal ear pieces (not shown in Figure 8). The embodiment of 12 Figure 8 shows a pick-up head which can replace the pick-up head ¦ of a standard stethoscope without havin~ to change anything else. R
14 No valve is shown in the embodiment of Figure 8 to selectively close off the resonant tube 109 but one could easily be added.
16 ¦ Also, a second resonant tube could be provided within a somewhat 17 larger pick-up head case 107, iE desired, and a valve could be 18 ¦ provided for selectively connecting one chamber or the other 19 ¦ with the sound transmission passage of the stethoscope.
2 ¦ Although the various aspects of the present invention 1 ¦ have been described with respect to specific structural e~amples 23 ¦ of stethoscopes emboding such inventions, it will be understood 24 I that e~uivalent various structures are possible and that the ¦ invention protected is within the full scope of the appended 26 claims. -2a 29 .
. '', , '. .' ' ' ~
F ~
. .
' ',. . .. .
. , ~
23 Figure 1 embodiment. The tube 90 of Figure 7 is open ended .
24 and of the shorter length of the tube 33 of Figure 1.
25 // ; .
26 1~ - . .
278 // -:
29 // . .
30 // .
. - 10 -.
r7 ~
l~ Referring to Figure 8, a variation of the embodiment 2 of Figures 1 through 4 is illustrated. The diaphragm 13' and 3 probe 15' have the same structure, as does the cap 71' and the 4 air vent 73'. A different shaped pick-up case 107 is provided, however, in order to make room for a coiledAresonant tube 109 6 that is placed thereinO One end of the tube 109 opens into the t, 7 cavity 41' in which the sound waves are generated by vibration B o the membrane 13'. An opposite end 111 of the coiled tube 109 9 is open. The rigid tube 49' is also connected to the chamber 45' ~
and communicates the sound generated therein through a tube 113 t 11 to normal ear pieces (not shown in Figure 8). The embodiment of 12 Figure 8 shows a pick-up head which can replace the pick-up head ¦ of a standard stethoscope without havin~ to change anything else. R
14 No valve is shown in the embodiment of Figure 8 to selectively close off the resonant tube 109 but one could easily be added.
16 ¦ Also, a second resonant tube could be provided within a somewhat 17 larger pick-up head case 107, iE desired, and a valve could be 18 ¦ provided for selectively connecting one chamber or the other 19 ¦ with the sound transmission passage of the stethoscope.
2 ¦ Although the various aspects of the present invention 1 ¦ have been described with respect to specific structural e~amples 23 ¦ of stethoscopes emboding such inventions, it will be understood 24 I that e~uivalent various structures are possible and that the ¦ invention protected is within the full scope of the appended 26 claims. -2a 29 .
. '', , '. .' ' ' ~
F ~
. .
' ',. . .. .
. , ~
Claims (24)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a stethoscope having a sound pick-up head and at least one ear piece that are connected at opposite ends of an enclosed sound transmission passage therebetween,the improvement comprising an elongated resonant cavity of a given volume connected at one end to said enclosed sound transmission passage in the vicinity of said pick-up head and opened to the atmosphere a distance from said one end, thereby allowing sound waves from said pick-up head to simultaneously pass through both the resonant cavity and the enclosed passage, whereby said resonant cavity causes sound frequencies within a given resonant frequency range dependent upon said cavity distance, to be amplified between the pick-up head and said ear piece.
2. The improved stethoscope according to claim 1 wherein said enclosed passage includes a length of hollow tube and further wherein said resonant cavity includes a second length of hollow tube that is open to the atmosphere at its free end.
3. The improved stethoscope according to claim 1 which add-itionally comprises a valve manually operable to selectively open or close the connection of said resonant cavity with said sound transmission passage.
4. The improved stethoscope according to claim 3 wherein said valve is formed as part of said pick-up head as a unitary structure.
5. The improved stethoscope according to claim 3 wherein said valve is positioned in the path of said enclosed sound transmission passage as an element physically separate from the pick-up head but connected therewith through a portion of said sound passage.
6. The improved stethoscope according to either of Claims 3 or 5 wherein said valve comprises a structure biased to normally connect the resonant cavity to the sound transmission passage until manually operated to close off the resonant cavity.
7. The improved stethoscope according to Claim 1 wherein said resonant cavity comprises a tube open at one end and connected at another end to said sound transmission passage, said tube being coiled within said pick-up head.
8. The stethoscope according to Claim 1 wherein the improvement additionally comprises a second elongated resonant cavity having a volume significantly different than that of said resonant cavity, said second resonant cavity also being connected at one end to the enclosed sound transmission passage in the vicinity of said pick-up head, and being opened to the atmosphere at its other end, said improvement further comprising a valve connected to said sound passage in a manner to permit selective connection of either said cavity or said second cavity to said sound passage, whereby said second resonant cavity causes sound frequencies within a second given resonant frequency range to be amplified and said valve permits selection of said given or said second frequency range for amplification.
9. The stethoscope according to Claim 8 wherein each of the resonant cavities include different lengths of tubing as major components thereof, whereby the length of tubing for one resonant cavity can be designed to maximize amplification for heart sounds and the other for lung sounds.
10. The improved stethoscope according to Claim 8 wherein said valve is mounted on a back surface of said sound pick-up, said valve being manually operable to connect one or the other or neither of the resonant cavities to said sound transmission passage.
11. The improved stethoscope according to Claim 8 wherein said valve is further characterized by permitting simultaneous connection of both said elongated resonant cavities to the enclosed sound transmission passage, whereby yet another frequency range is amplified that is higher than those of either of said elongated resonant cavities when connected alone. .
12. The improved stethoscope according to Claim 11 wherein said valve comprises separately operable valves that independently control whether each of the two elongated resonant cavities is opened or closed to the enclosed sound transmission passage, each of said separately operable valves being resiliently urged to an open position.
13. The stethoscope according to Claim 1 which addition-ally includes an improved pick-up head which comprises:
a cup-like structure opening outward in a lip and having an opposite generally closed surface with an opening that connects into said sound transmission passage, a diaphragm attached within said cup-like structure a given distance from its said lip, a probe having a length greater than said given distance connected as part of said diaphragm and extending outward of said cup-like structure, whereby a body to be monitored is contacted by said probe and cup-like structure lip and sound vibrations are generated within said enclosed passage according to sound vibrations within the monitored body, said probe being brought to a blunt point of small dimensions, whereby sound is picked-up from a body at substantially a point thereon, thereby making the sound pick-up clear and without interference from independent sound vibrations existing in other points of the body, and an air passage through said cup-like structure in a location between the connection of the diaphragm and the outer lip, thereby to permit the diaphragm to move freely without air pressure impedance.
a cup-like structure opening outward in a lip and having an opposite generally closed surface with an opening that connects into said sound transmission passage, a diaphragm attached within said cup-like structure a given distance from its said lip, a probe having a length greater than said given distance connected as part of said diaphragm and extending outward of said cup-like structure, whereby a body to be monitored is contacted by said probe and cup-like structure lip and sound vibrations are generated within said enclosed passage according to sound vibrations within the monitored body, said probe being brought to a blunt point of small dimensions, whereby sound is picked-up from a body at substantially a point thereon, thereby making the sound pick-up clear and without interference from independent sound vibrations existing in other points of the body, and an air passage through said cup-like structure in a location between the connection of the diaphragm and the outer lip, thereby to permit the diaphragm to move freely without air pressure impedance.
14. The improved stethoscope according to Claim 13 wherein said diaphragm is circular in shape and attached around its circumference to an inside surface of said cup-like structure, said diaphragm being flexible for a portion around its outside adjacent its circumference, an adjoining center portion of said diaphragm being rigid and attached to said probe.
15. In a stethoscope having a sound pick-up head and at least one ear piece that are connected at opposite ends of a hollow air sound transmission passage, an improved sound pick-up head comprising:
a shell having first and second openings, said first opening being much larger than said second opening, means connecting said second opening to said sound transmission passage, a resilient diaphragm extending across said first opening and held at its edges to said shell, a probe of a given length firmly attached to said diaphragm in a middle portion thereof and shaped into a blunt point to be pushed against a patient's skin, thereby to pick up sound from a body at substantially a point thereon, a positioning stop attached as part of said shell and extending in the direction of said probe a distance from said diaphragm that is less than said given length of the probe, thereby to limit the force of the point applied to the patient through the resiliency of the diaphragm and provide a firm surface for stabilizing the head against the patient, and at least one air passage provided through said shell on the probe side of said diaphragm, thereby to permit the diaphragm to move freely without air pressure impedance when the stops are held against a patient's skin.
a shell having first and second openings, said first opening being much larger than said second opening, means connecting said second opening to said sound transmission passage, a resilient diaphragm extending across said first opening and held at its edges to said shell, a probe of a given length firmly attached to said diaphragm in a middle portion thereof and shaped into a blunt point to be pushed against a patient's skin, thereby to pick up sound from a body at substantially a point thereon, a positioning stop attached as part of said shell and extending in the direction of said probe a distance from said diaphragm that is less than said given length of the probe, thereby to limit the force of the point applied to the patient through the resiliency of the diaphragm and provide a firm surface for stabilizing the head against the patient, and at least one air passage provided through said shell on the probe side of said diaphragm, thereby to permit the diaphragm to move freely without air pressure impedance when the stops are held against a patient's skin.
16. The improved stethoscope according to Claim 15 wherein the portion of said diaphragm immediately surrounding said probe is rigid and further wherein a portion of said diaphragm surrounding said rigid portion and connecting with said shell is flexible.
17. The improved stethoscope according to Claim 15 wherein said pick-up head additionally comprises a valve attached to an outside surface of said shell, said valve constructed to selectively connect either of a first or second outlet port to said second shell opening.
18. The improved stethoscope according to Claim 17 which additionally comprises first and second segments of hollow tubing of significantly different lengths, one end of one length of tubing being connected to said first port and one end of the second length of tubing being connected to said second port, the opposite ends of each of said first and second lengths of tubing being open to the atmosphere.
19. A method of monitoring sounds internally generated in a body, such as heart and lung sounds, comprising the steps of:
holding a bluntly pointed probe against the outside of said body, whereby it vibrates according to the sound vibrations within said body, generating sound waves in an enclosed air chamber from the vibrating probe through a diaphragm that is attached to the probe, communicating said sound waves to a sound detector, such as a human ear, from the enclosed air chamber, and simultaneously communicating said sound waves from the enclosed air chamber to one end of a hollow resonant tube that is open to the atmosphere at its other end, whereby the detected sounds are amplified.
holding a bluntly pointed probe against the outside of said body, whereby it vibrates according to the sound vibrations within said body, generating sound waves in an enclosed air chamber from the vibrating probe through a diaphragm that is attached to the probe, communicating said sound waves to a sound detector, such as a human ear, from the enclosed air chamber, and simultaneously communicating said sound waves from the enclosed air chamber to one end of a hollow resonant tube that is open to the atmosphere at its other end, whereby the detected sounds are amplified.
20. For a stethoscope having a sound pick-up head, at least one ear piece and a flexible tube for carrying sound from the pick-up head to said at least one ear piece, the improvement comprising:
a valve connected into said tube at a position near the pick-up head for controllably connecting a port thereto in response to manual actuation, and a second length of tubing with one end connected to said port and another end open, thereby to provide a resonant chamber that is selectively connected with the sound carrying tube.
a valve connected into said tube at a position near the pick-up head for controllably connecting a port thereto in response to manual actuation, and a second length of tubing with one end connected to said port and another end open, thereby to provide a resonant chamber that is selectively connected with the sound carrying tube.
21. The stethoscope improvement according to Claim 20 wherein said valve is biased to normally provide for sound connection between said sound carrying tube and said second tube, and includes means responsive to manual actuation to close off said second length of tube at its connection with said sound carrying tube.
22. For a stethoscope having a sound pick-up head, at least one ear piece and a flexible tube for carrying sound from the pick-up head to said at least one ear piece, the improvement comprising:
a valve connected into said tube at a position near the pick-up head or controllably connecting either of two ports or both thereto in response to manual actuation a second length of flexible tube with one end connected to one of said ports and another end open, a third length of flexible tube with one end connected to the other of said ports and another end open, said second length of tube being significantly longer than said third length of tube.
a valve connected into said tube at a position near the pick-up head or controllably connecting either of two ports or both thereto in response to manual actuation a second length of flexible tube with one end connected to one of said ports and another end open, a third length of flexible tube with one end connected to the other of said ports and another end open, said second length of tube being significantly longer than said third length of tube.
23. In a stethoscope having a sound pick-up head and at least one ear piece that are connected at opposite ends of an enclosed sound transmission passage therebetween, the improvement comprising mechanical means including an open-ended cavity of a given volume connected to said enclosed sound transmission passage adjacent said pick-up head in a manner that sound from the pick-up head simultaneously travels to the ear piece and said cavity, thereby amplifying at said ear piece a given frequency range of sounds detected at said pick-up head, said given frequency range being dependent upon the volume of said cavity, said volume being selected to maximize the amplitude of sounds made by a certain function of the body that are in a defineable frequency range, such as those of the heart or lungs.
24. A method of monitoring sounds internally generated in a biological body, such as heart and lung sounds, comprising the steps of:
providing a structure of a resilient diaphragm held across a circular opening but recessed a distance into said opening from a circular edge, said diaphragm carrying a probe attached to its center and shape into a blunt point extending beyond said opening edge, holding said structure against a biological body with said circular edge contacting skin of the body and with the probe point indenting the skin and causing the diaphragm to be pushed further into the circular opening, providing an air passage through the structure forming the circular opening at a location between the circular edge and the diaphragm, thereby to permit the diaphragm to move freely without air pressure impedance when the circular edge is held firmly against the skin, and communicating the sound vibrations from a side of the diaphragm opposite the probe to a sound detector such as an ear, whereby sound is detected from a substantial point of said biological body with the result of the sound being clear without interference from independent sounds existing at other points of the body.
providing a structure of a resilient diaphragm held across a circular opening but recessed a distance into said opening from a circular edge, said diaphragm carrying a probe attached to its center and shape into a blunt point extending beyond said opening edge, holding said structure against a biological body with said circular edge contacting skin of the body and with the probe point indenting the skin and causing the diaphragm to be pushed further into the circular opening, providing an air passage through the structure forming the circular opening at a location between the circular edge and the diaphragm, thereby to permit the diaphragm to move freely without air pressure impedance when the circular edge is held firmly against the skin, and communicating the sound vibrations from a side of the diaphragm opposite the probe to a sound detector such as an ear, whereby sound is detected from a substantial point of said biological body with the result of the sound being clear without interference from independent sounds existing at other points of the body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/053,924 US4270627A (en) | 1979-07-02 | 1979-07-02 | Stethoscope with probe sound pick-up and resonant cavity amplification |
| US053,924 | 1987-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1129781A true CA1129781A (en) | 1982-08-17 |
Family
ID=21987484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA354,447A Expired CA1129781A (en) | 1979-07-02 | 1980-06-20 | Stethoscope with probe sound pick-up and resonant cavity amplification |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4270627A (en) |
| JP (1) | JPS5611043A (en) |
| KR (1) | KR840002084B1 (en) |
| CA (1) | CA1129781A (en) |
| DE (1) | DE3024949A1 (en) |
| GB (1) | GB2051584B (en) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4387784A (en) * | 1981-10-06 | 1983-06-14 | Hill Raymond R | Stethoscope with improved resonant cavity amplification |
| US4440258A (en) * | 1982-05-12 | 1984-04-03 | Minnesota Mining & Manufacturing Company | Tunable stethoscope |
| US4763753A (en) * | 1984-07-05 | 1988-08-16 | Etymotic Research, Inc. | Insert earphones for audiometry |
| US4633971A (en) * | 1985-11-06 | 1987-01-06 | Minnesota Mining And Manufacturing Company | Stethoscope with high frequency filter |
| US5120051A (en) * | 1988-01-11 | 1992-06-09 | Greenberg S Elliot | Arm exercise device |
| US4903794A (en) * | 1988-03-23 | 1990-02-27 | Klippert Don H | Acoustical amplifying stethoscope |
| JPH02172449A (en) * | 1988-12-13 | 1990-07-04 | Min Jyan Shui | Structure of highly analyzable chest piece for stethoscope |
| DK163400C (en) * | 1989-05-29 | 1992-07-13 | Brueel & Kjaer As | PROBE MICROPHONE |
| US5111904A (en) * | 1989-06-02 | 1992-05-12 | Minnesota Mining And Manufacturing Company | Molded article having elastomeric mold member used therewith |
| US5389747A (en) * | 1993-08-16 | 1995-02-14 | Mohrin; Carl M. | Stethoscope |
| US5530212A (en) * | 1995-05-12 | 1996-06-25 | Baffoni; Frank A. | Multiple phase stethoscope |
| ATE241316T1 (en) * | 1995-07-21 | 2003-06-15 | Stethtech Corp | ELECTRONIC STETHOSCOPE |
| US6002777A (en) * | 1995-07-21 | 1999-12-14 | Stethtech Corporation | Electronic stethoscope |
| FR2738141B1 (en) * | 1995-08-29 | 1998-01-02 | Boussignac Georges | BIAURICULAR STETHOSCOPE WITH ENVIRONMENTAL LISTENING |
| US5952618A (en) * | 1996-07-11 | 1999-09-14 | Deslauriers; Richard J. | Acoustic conduit for use with a stethoscope |
| US6028942A (en) * | 1997-02-20 | 2000-02-22 | Greenberger; Hal P. | Stethoscope with reduced susceptibility to interference from ambient noise |
| US6119806A (en) * | 1997-06-24 | 2000-09-19 | Baffoni; Frank A. | Multiple phase acoustic systems |
| DE10244310C1 (en) * | 2002-09-23 | 2003-12-18 | Hoffmann Air Cargo Equipment G | Air freight netting, of synthetic filament cables, has a woven center section and structured edge strips with edge loops, to be secured to the pallet fasteners |
| US20060283656A1 (en) * | 2005-06-17 | 2006-12-21 | Tung-Yi Lin | Bell side structure for stethoscope head |
| US7998091B2 (en) | 2005-11-23 | 2011-08-16 | 3M Innovative Properties Company | Weighted bioacoustic sensor and method of using same |
| US8024974B2 (en) | 2005-11-23 | 2011-09-27 | 3M Innovative Properties Company | Cantilevered bioacoustic sensor and method using same |
| US8396228B2 (en) * | 2008-02-27 | 2013-03-12 | Stethoscope Technologies, Inc. | Floating ballast mass active stethoscope or sound pickup device |
| CN104146727A (en) * | 2014-08-27 | 2014-11-19 | 苏州承乐电子科技有限公司 | Resonance type two-sided stethoscope |
| CN107518914A (en) * | 2017-08-22 | 2017-12-29 | 丁向峰 | Stethoscope |
| US11596378B2 (en) * | 2017-10-22 | 2023-03-07 | Shangzhi Medical Techology (Hangzhou) Co., Ltd. | Device and method for detecting physiological sound |
| US11890131B2 (en) | 2017-10-22 | 2024-02-06 | Shanzhi Medical Technology (hangzhou) Co., Ltd. | Device and method for detecting physiological sound |
| WO2019134146A1 (en) * | 2018-01-05 | 2019-07-11 | 深圳市沃特沃德股份有限公司 | Voice collection device and home appliance |
| CN108514428A (en) * | 2018-04-12 | 2018-09-11 | 清华大学 | Gurgling sound harvester |
| CN112882002A (en) * | 2021-01-19 | 2021-06-01 | 北京世纪之星应用技术研究中心 | Pickup and aircraft detection system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2513827A (en) * | 1950-07-04 | Stethoscope with valved sound | ||
| US2158764A (en) * | 1939-05-16 | Stethoscope | ||
| US3179204A (en) * | 1965-04-20 | Acoustic stethoscope | ||
| US3157246A (en) * | 1964-11-17 | Diaphragm mounting for stethoscope | ||
| US2363686A (en) * | 1943-10-29 | 1944-11-28 | Harry F. Olson | Acoustic Stethoscope |
-
1979
- 1979-07-02 US US06/053,924 patent/US4270627A/en not_active Expired - Lifetime
-
1980
- 1980-06-20 CA CA354,447A patent/CA1129781A/en not_active Expired
- 1980-07-01 GB GB8021557A patent/GB2051584B/en not_active Expired
- 1980-07-02 KR KR1019800002621A patent/KR840002084B1/en active
- 1980-07-02 JP JP8929580A patent/JPS5611043A/en active Pending
- 1980-07-02 DE DE19803024949 patent/DE3024949A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| KR840002084B1 (en) | 1984-11-14 |
| US4270627A (en) | 1981-06-02 |
| KR830003201A (en) | 1983-06-18 |
| JPS5611043A (en) | 1981-02-04 |
| GB2051584A (en) | 1981-01-21 |
| GB2051584B (en) | 1983-10-19 |
| DE3024949A1 (en) | 1981-01-22 |
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