US3712409A - Stethoscope - Google Patents

Stethoscope Download PDF

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Publication number
US3712409A
US3712409A US00222798A US3712409DA US3712409A US 3712409 A US3712409 A US 3712409A US 00222798 A US00222798 A US 00222798A US 3712409D A US3712409D A US 3712409DA US 3712409 A US3712409 A US 3712409A
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United States
Prior art keywords
stethoscope
pin
cavities
cavity
diaphragm
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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
US00222798A
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English (en)
Inventor
I Kizakisz
V Horvath
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Medicor Muvek
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Medicor Muvek
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Publication date
Application filed by Medicor Muvek filed Critical Medicor Muvek
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Publication of US3712409A publication Critical patent/US3712409A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00—Instruments for auscultation
    • A61B7/02—Stethoscopes
    • A61B7/026—Stethoscopes comprising more than one sound collector

Definitions

  • ABSTRACT In a stethoscope of the type having a body with a pair of opposite cavities one of which is covered by a diaphragm, a switching pin is provided at right angle to the stethoscope axis which cooperates with a pair of coupling-out stubs. Both the stethoscope body and the switching pin are provided with passages through which one or the other of the cavities will be connected with the pair of coupling-out stubs.
  • sounds or noises of higher frequency can be observed without absorption by deep sounds if the cavity with the diaphragm is placed on the observation surface since, then, deep sounds or noises of lower frequency are filtered out by the diaphragm. 1n the other position of the switching pin, the uncovered cavity of the body communicates with the pair of coupling-out stubs in which case sounds or noises of lower frequency (bass) can be observed. Obviously, in this case no filtering is necessary because deep sounds or noises absorb those of higher frequencies.
  • This invention relates to stethoscopes or sensors which are used for observing sounds or noises of the heart, the lungs and the veins and which transmit such sounds or noises from an observed portion of a patients body into a yieldable tube and, there through, into the ear of an observer.
  • the known stethoscopes are suitable for observing of sound of noises within a relatively narrow range only such as the heart or the lungs or the veins and, therefore, their use is limited to the medical treatment of the respective part of the body.
  • the known suggestion is based on the acoustic phenomenon of high frequency sounds being suppressed by low frequency ones. Therefore, one of the concave surfaces or cavities of a stethoscope is-according to the known suggestioncovered by a diaphragm the purpose of which is an amplified transmission of higher frequencies-higher sounds-without distortion.
  • the diaphragm can be selected so as to filter out low frequency sounds.
  • the other concave surface or cavity is open and is destined to transmit low frequency-deeper-sounds where the danger of absorption of high frequency sounds is of no significance any more.
  • single lead-outs which, at the same time, serve for switching over means.
  • the single lead-outs have then been complemented by flexible Y-tubes by means of which the vibrations coupled out of the stethoscope have been subdivided and lead into the ears of an observer separately.
  • a deficiency of such expedient however, consists in the obligatory use of a Y-tube because it means a considerable, resistance against propagation of vibrations whereby stethoscope sensitivity has significantly' been decreased.
  • the main object of the present invention is to obviate the aforesaid deficiencies and the provision of a stethoscope which has, besides'double lead-outs, a pair of cavities and, thus, a required sensitivity in the whole frequency range of observation.
  • the basic idea of the invention is that such stethoscopes may be obtained if separate component parts are provided for couplingout and controlling respectively, in contrast to the known devices of a similar destination, as described above.
  • a switching pin for alternately connecting the coupling-out stubs with the cavities is employed.
  • the stethoscope comprises, in a manner known per se, a shield in addition to its body. It has been found that both the pair of stubs and a hole guiding the switching pin can be provided for without intermingling with one another.
  • the invention is concerned with a stethoscope comprising, in a manner known per se, a body, an open cavity in said body, a hollow shield forming an extension of the-body in a direction opposite to said open cavity, a diaphragm closing the cavity in said shield, and an axial hole connecting both cavities through said body.
  • the body comprises a pair of couplingout stubs and a switching pin at right angle to its axis, both coupling-out stubs being connected through the switching pin with said axial hole while the switching pin is provided with passages for connecting said cavities alternately with one of the coupling-out stubs in extreme positions of the switching pin.
  • the coupling-out stubs and the switching pin in the body of the stethoscope without particular machining difficulties and in consideration of strength characteristics.
  • the pair of coupling-out stubs may have a twin tube connected directly to them through which vibrations caused by sounds or noises picked up by the stethoscope will be transmitted to their destination place without any attenuation due to subdivision.
  • FIG. 1 is a side elevational view partly in section.
  • FIGS. la and 1b show each a detail on a relatively larger scale.
  • FIG. 2 illustrates a sectional view taken along the line II-Il of FIG. 1.
  • FIG. 3 represents a longitudinal sectional view of a detail.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3.
  • FIG. 5 represents a cross-sectional view taken along the line V--V of FIG. 3.
  • FIGS. 6 to 9 are cross-sectional views showing various operational positions.
  • reference numeral 10 designates the body of a stethoscope according to the invention comprising an open cavity 12.
  • a hollow shield 14 is provided which forms an extension of body 10 and the cavity of which is referred to by reference character 16.
  • the cavity 16 in shield 14 is closed by a diaphragm 18. Both cavities l2 and 16 are connected with one another through the body 10 by a hole 22 arranged in axial direction 20.
  • the body 10 comprises, at right angle to its axis 20, and in radial direction, a pair of coupling-out stubs 24 and 26, and a switching pin 28.
  • the axes of the couplingout stubs 24 and 26 as well as of the switching pin 28 are referred to by reference numerals 30, 32 and 34, respectively.
  • Both coupling-out stubs 24 and 26 are connected through the switching pin 28 with an axial bore 22 while the switching pin 28 comprises passages which connect the cavities l2 and 16 alternately with one of the coupling-out stubs 24 and 26 as will be described hereinafter in closer details.
  • the switching pin 28 is provided with a pair of radial blind holes 36 and 38 which open in mutually opposite directions as will the right and blind hole 38 opens to the left as regards the' drawing.
  • Both blind holes 36 and 38 are, in addition, mutually spaced along the axis 34 of switching pin 28. Moreover, they are connected with one another by means of an axial groove 40 which opens towards the coupling-out stubs 24 and 26, as goes forth particularly from FIG. 2. It will be seen that the blind holes 36 and 38 are confined by simple cylindrical surfaces which open into the groove 40 and may be easily machined in the switching pin 28.
  • the switching pin 28 is guided in a hole 42 which is formed in the body of the stethoscope between the cavities 12 and 16.
  • the switching pin 28 may be displaced in the hole 42 between a pair of extreme positions each of which is illustrated in FIGS. 6 and 7 or 8 and 9, respectively.
  • displacements of the switching pin 28 between the aforesaid-extreme positions will preferably be braked since, otherwise, the switching pin 28 may glide from one extreme position into the other one unintentionally.
  • suchbraking is warranted by loading the switching pin 28 by a ball 46 accommodated in a blind hole 44 and biased by a spring 48 so that the ball 46 engages an axial nest 50 which is provided at the opposite side of the switching pin 28 as regards the axial groove 40 as goesforth particularly from FIG. 3. 1
  • assembly holes 52 and 54 between the nest 50 and the blind holes 36 and 38, respectively, illustrated particularly in FIGS. 4 and 5.
  • the assembly holes 52 and 54 permit to push back the spring loaded ball 46 into blind hole 44 in the body 10 whereupon the switching pin'28 may be removed from its hole 42.
  • the switching pin 28 is pushed into hole 42 and is displaced inwardly while the ball 46 is pushed back against biasing spring 48, the ball 46 will gradually jump into nest 50 whereby the switching pin 28 is, in addition to being braked, also secured against falling out.
  • the blind hole 44 which accommodates the spring 48 biasing the ball 46 is coaxially arranged with one of the coupling-out stubs 24 and 26, more particularly, in the instant case with the axis 32 of the coupling-out stub 26.
  • Such arrangement permits that the hole for receiving the coupling-out stub 28 and the hole 44 for receiving the ball 46 may be manufactured by employing one and the same setting for both operations.
  • the coupling-out stubs 24 and 26 are fixed in the body 10 by means of tight fit. This most simple connection is permitted by the essentially radial arrangement according to the invention of the coupling-out stubs, displacement of which may be dispensed with for the purpose of switching over performed now by the switching pin 28. Nevertheless, the coupling-out stubs 24 and 26 might be fixed, e.g., by means of threaded connection as well if necessary.
  • the shield 14 comprising the cavity 16 is of circular shape and the cavity 16 itself has a spherical surface.
  • the diaphragm 18 covering the cavity 16' of the shield 14 is held down by a ring 56 threadedly engaging shield 14.
  • the open cavity 12 has a yieldable funnel 58 connected to it which forms with its inner surface an extension of the cavity 12. According to test results, such stethoscope results in excellent acoustic conditions. At the same time, it permits to employ recent manufacturing methods (cold working) without cutting operations.
  • the yieldable funnel 58 is connected with a peripheral groove 60 of the body 10 and is supported by cylindrical surfaces 62 and 64 at both sides of groove 60, and by a shoulder 66 of the body 10. Such details are illustrated in FIG. In on a relatively larger scale.
  • the advantage of such arrangement consists in the simple geometrical form of the fixing surfaces and their easy manufacturing ability due to such forms.
  • the diaphragm 18 closing the cavity 16 of the shield 14 and its support surface 14a have a ring 68 of circular cross-section inserted between them the details of which are shownin FIG. 1b on a relatively larger scale.
  • the diaphragm 18 is constantly tightened thereby.
  • a further advantage consists in improving the acoustic conditions of the device as has been proved by test results.
  • the ring 68 of circular cross-sectional area will protrudefrom the support surface 14a even in assembled position since, thereby, also the diaphragm 18 will protrude from the front surface of the ring 56 so that'it can be placed along its whole surface on a patients body the advantage of which is obvious.
  • the diaphragm 18 is provided with a bent down brim 18a.
  • the coupling-out stubs 24 and 26 may have a yieldable twin pipe 70 connected to them the bifurcated extremities of which are pushed each on one coupling-out stub 24 and 26 as shown in FIG. 2.
  • the yieldable twin pipe 70 serves for considerably decreasing the resistance against acoustic waves whereby the sensitivity of the stethoscope becomes significantly increased. From a manufacturing point of view, the pipe does not entail any difficulties while its yieldability is big enough not to impede medical examination.
  • the stethoscope is placed with its cavity 16 covered by the diaphragm 18 on the patients body while the switching pin 28 is displaced into its position shown in FIGS. 1 and 2 where the blind hole 38 occupies its position in the axis 20 of the stethoscope. Then, the cavity 16 is connected through hole 22, blind hole 38 and groove 40 with the coupling-out stubs 26 so that sound vibrations picked up by the diaphragm 18 will be transmitted into twin tube 70.
  • FIGS. 6 and 7 switching pin 28 and holes 36, 38 and 40 in the body 10 are illustrated on a relatively larger scale.
  • the stethoscope is placed on the patients body with its open cavity 12 without diaphragm.
  • switching pin 28 is axially displaced in the direction of arrow 74 (upwards in FIG. 1)
  • twin pipe 70 is connected to the whereby blind hole 36 coincides with axis which means that cavity 12 is connected with the couplingout stubs 24 and 26 through hole 22, blind hole 36 and groove 40.
  • blind hole 36 coincides with axis which means that cavity 12 is connected with the couplingout stubs 24 and 26 through hole 22, blind hole 36 and groove 40.
  • FIGS. 8 and 9 Such position is illustrated in FIGS. 8 and 9.
  • Ring 68 may be replaced in a similar manner.
  • the switching pin 28 If the switching pin 28 has to be removed from the stethoscope, it is caused to occupy its position shown in FIG. 2 where the ball 46 is pushed by means of a needle-like instrument through the coupling-out stub 26, groove 40, blind hole 38 and hole 54 (FIG. 5) against spring 48 into blind hole 44. Then, a slight axial dis placement (downwards in FIG. 2 which is the direction of arrow 76 opposite to the direction of arrow 74) already prevents that removal of switching pin 28 be locked by the ball 46 which would engage nest 50.
  • a replacement of funnel 58 may be obtained by means of simple deformation in a manner known per se.
  • a stethoscope comprising a body having a pair of cavities therein that open outwardly in opposite directions, one of said cavities being covered by a diaphragm, there being an axial hole through said body interconnecting said cavities, means on said body for connecting stethoscope tubing to said body in a direction transverse to said hole, a switching pin mounted for sliding movement lengthwise of itself in said body, said pin having passage means therein such that in one position of said pin one of said cavities communicates through said hole and through said passage means with said connecting means, while in another position of said pin the other of said cavities communicates through said hole and through said passage means with said connecting means.
  • said passage means including a pair of radially extending blind holes in said pin that are spaced apart lengthwise of said pin and that open through said pin in opposite directions for selective communication with one of said cavities depending on the position of said pin, and a groove extending lengthwise of said pin and interconnecting said blind holes and opening toward said connecting means.
  • a stethoscope as claimed in claim 2 said pin having a second groove therein opposite and parallel to the first-mentioned groove, and a spring-biased ball disposed in said second groove to brake the sliding movement of said pin.
  • a stethoscope as claimed in claim 3 there being assembly holes extending between said blind holes and said second groove.
  • a stethoscope as claimed in claim 3 the biasing spring of said ball being disposed in a blind hole in said body, said blind hole being coaxial with said connecting ii f li stethoscope as claimed in claim 1, said connecting means comprising a short nozzle force-fitted in said body.
  • a stethoscope as claimed in claim 1 said cavities being part spherical, a ring screw-threadedly connected to the margins of said one cavity releasably to secure said diaphragm thereon, the other cavity being rimmed with an annular yieldable member which forms an extension of the side walls of said other cavity.
  • annular yieldable member having an internal flange that is releasably retained in an annular outwardly opening groove in said body surrounding said other cavity, said yieldable member engaging cylindrical surfaces at both sides of said groove and engaging an annular abutment shoulder on said body.
  • a stethoscope as claimed in claim 1 and a flexible tube releasably connected to said connecting means.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
US00222798A 1971-02-10 1972-02-02 Stethoscope Expired - Lifetime US3712409A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HUME1320A HU163008B (ja) 1971-02-10 1971-02-10

Publications (1)

Publication Number Publication Date
US3712409A true US3712409A (en) 1973-01-23

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ID=10999236

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Application Number Title Priority Date Filing Date
US00222798A Expired - Lifetime US3712409A (en) 1971-02-10 1972-02-02 Stethoscope

Country Status (17)

Country Link
US (1) US3712409A (ja)
AT (1) AT318795B (ja)
BE (1) BE779190A (ja)
BR (1) BR7200730D0 (ja)
CA (1) CA952825A (ja)
CH (1) CH536106A (ja)
CS (1) CS152984B2 (ja)
DD (1) DD95647A5 (ja)
DE (1) DE2204730A1 (ja)
FR (1) FR2126786A5 (ja)
GB (1) GB1372461A (ja)
HU (1) HU163008B (ja)
IT (1) IT948070B (ja)
NL (1) NL7201456A (ja)
RO (1) RO63467A (ja)
SU (1) SU431656A3 (ja)
YU (1) YU34353B (ja)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951230A (en) * 1974-10-03 1976-04-20 Minnesota Mining And Manufacturing Company Multi-sound chamber stethoscope
WO1986004803A1 (en) * 1985-02-21 1986-08-28 Wilhelm Haselmeier Gmbh & Co. Double-hose stethoscope
US4669572A (en) * 1985-05-03 1987-06-02 Firma Kirchner & Wilhelm Stethoscope
US4928786A (en) * 1989-04-20 1990-05-29 Allen Derek R Self-sealing dual stethoscope head
US5498841A (en) * 1995-03-10 1996-03-12 Allen Derek R Dual acoustical passage stethoscope
USD742356S1 (en) * 2013-06-25 2015-11-03 Google Inc. Headphone assembly
USD743370S1 (en) * 2013-06-25 2015-11-17 Google Inc. Headphone assembly
US9241209B2 (en) 2013-06-25 2016-01-19 Google Inc. Headphones with adaptable fit
USD844586S1 (en) 2017-08-04 2019-04-02 Google Llc Audio assembly
USD867326S1 (en) 2017-07-21 2019-11-19 Google Llc Wireless earbuds
USD879075S1 (en) 2018-07-11 2020-03-24 Google Llc Earbud stand assembly
USD890696S1 (en) 2017-07-21 2020-07-21 Google Llc Earbud charging case
USD896781S1 (en) 2017-08-04 2020-09-22 Google Llc Audio assembly
CN111973215A (zh) * 2019-05-21 2020-11-24 无锡市凯顺医疗器械制造有限公司 多音频听诊器听头及配合结构及听取多音频的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH026010U (ja) * 1988-06-28 1990-01-16
GB2268405A (en) * 1992-07-07 1994-01-12 Robert Parnell Mandeville A stethoscope accessory

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035656A (en) * 1962-05-22 Stethoscope
US3223195A (en) * 1965-12-14 Stethoscope with convertible receiver
US3275099A (en) * 1966-09-27 Stethoscope ear tube mounting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035656A (en) * 1962-05-22 Stethoscope
US3223195A (en) * 1965-12-14 Stethoscope with convertible receiver
US3275099A (en) * 1966-09-27 Stethoscope ear tube mounting

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951230A (en) * 1974-10-03 1976-04-20 Minnesota Mining And Manufacturing Company Multi-sound chamber stethoscope
WO1986004803A1 (en) * 1985-02-21 1986-08-28 Wilhelm Haselmeier Gmbh & Co. Double-hose stethoscope
US4823906A (en) * 1985-02-21 1989-04-25 Wilhelm Haselmeier Gmbh & Co. Stethoscope having a body contact piece provided with two alternatively employed auscultation heads
US4669572A (en) * 1985-05-03 1987-06-02 Firma Kirchner & Wilhelm Stethoscope
US4928786A (en) * 1989-04-20 1990-05-29 Allen Derek R Self-sealing dual stethoscope head
US5498841A (en) * 1995-03-10 1996-03-12 Allen Derek R Dual acoustical passage stethoscope
US9241209B2 (en) 2013-06-25 2016-01-19 Google Inc. Headphones with adaptable fit
USD742355S1 (en) * 2013-06-25 2015-11-03 Google Inc. Headphone assembly
USD743370S1 (en) * 2013-06-25 2015-11-17 Google Inc. Headphone assembly
USD743932S1 (en) * 2013-06-25 2015-11-24 Google Inc. Headphone assembly
USD742356S1 (en) * 2013-06-25 2015-11-03 Google Inc. Headphone assembly
US10194229B2 (en) 2013-06-25 2019-01-29 Google Llc Headphones with adaptable fit
US10506321B2 (en) 2013-06-25 2019-12-10 Google Llc Headphones with adaptable fit
USD867326S1 (en) 2017-07-21 2019-11-19 Google Llc Wireless earbuds
USD890696S1 (en) 2017-07-21 2020-07-21 Google Llc Earbud charging case
USD844586S1 (en) 2017-08-04 2019-04-02 Google Llc Audio assembly
USD894152S1 (en) 2017-08-04 2020-08-25 Google Llc Audio assembly
USD896781S1 (en) 2017-08-04 2020-09-22 Google Llc Audio assembly
USD921610S1 (en) 2017-08-04 2021-06-08 Google Llc Audio assembly
USD879075S1 (en) 2018-07-11 2020-03-24 Google Llc Earbud stand assembly
CN111973215A (zh) * 2019-05-21 2020-11-24 无锡市凯顺医疗器械制造有限公司 多音频听诊器听头及配合结构及听取多音频的方法
CN111973215B (zh) * 2019-05-21 2023-08-22 无锡市凯顺医疗器械制造有限公司 多音频听诊器听头及配合结构及听取多音频的方法

Also Published As

Publication number Publication date
IT948070B (it) 1973-05-30
DD95647A5 (ja) 1973-02-12
BE779190A (fr) 1972-05-30
CH536106A (de) 1973-04-30
BR7200730D0 (pt) 1973-11-01
CA952825A (en) 1974-08-13
FR2126786A5 (ja) 1972-10-06
RO63467A (fr) 1978-08-15
DE2204730A1 (de) 1972-08-17
YU34353B (en) 1979-07-10
AT318795B (de) 1974-11-11
CS152984B2 (ja) 1974-02-22
HU163008B (ja) 1973-05-28
NL7201456A (ja) 1972-08-14
SU431656A3 (ja) 1974-06-05
GB1372461A (en) 1974-10-30
YU29972A (en) 1978-12-31

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