US2836255A - Reichardt - Google Patents

Reichardt Download PDF

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Publication number
US2836255A
US2836255A US2836255DA US2836255A US 2836255 A US2836255 A US 2836255A US 2836255D A US2836255D A US 2836255DA US 2836255 A US2836255 A US 2836255A
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United States
Prior art keywords
diaphragm
case
inertia
tubular
tension
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Expired - Lifetime
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English (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

Definitions

  • This invention has as subject a medical acoustic device suitable for sounding the human or animal body, more especially for diagnosis of ailments of the respiratory organs, of the heart, of the larynx, and so on.
  • the device is distinguished from known apparatuses by the high amplification of the intensity of the sounds to be observed and by the complete absence of any background noise produced by the apparatus.
  • the device comprises a case with two diaphragms, the tension of which is adjustable and one of which, plane and disposed at the bottom of the case, together with an element acting by inertia delimits an air chamber, while the other, which is tubular, is connected on the one hand to a passage leading from the air chamber through the inertia element and on the other hand to a tubulure which is fastened on the case and which is connected to the listening tubes of a stethoscope.
  • the case and the inertia element have the form of solids of revolution which have parallel generatrices and which are disposed one inside the other and which enclose between them a second air chamber in which the tubular diaphragm is disposed.
  • the inertia element is held in the case by washers of flexible material so as to be able to execute axial movements produced by the air of the first chamber under the action of the oscillations of the plane diaphragm, which oscillations are produced by the sounds to be observed.
  • the axial movement of the inertia element modify the longitudinal tension of the tubular diaphragm and at the same time create in the second air chamber periodic pressure variations which act transversely on the tubular diaphragm.
  • the case At its lower end, the case is provided with a rim on which there are fastened and joined one of the flexible washers holding the inertia element, the plane diaphragm, and an angle piece curved to correspond with the diameter of the rim of the case and which protects the diaphragm and which, when placed on the body to be sounded, stretches the skin and at the same time insulates the diaphragm from sounds coming from outside.
  • the top of the case is provided with a means having a rotary knob for varying the tension of the tubular diaphragm and, through the medium of the inertia element, for also giving the plane diaphragm the appropriate tension for the sounding.
  • the inertia element is a solid or hollow body, the natural frequency of which is outside the frequencies to be amplified by the listening device.
  • the case 1 in the form of a cone or another solid of revolution, is closed at the bottom by a plane diaphragm 2, the rigidity of which is selected according to the par ticular use for which the device is intended.
  • the case houses an element 3 acting by inertia after the style of a balance weight and which is held in place by washers 4 and 5 which are inserted in circular grooves provided on ice 9 its surface.
  • the element 3, of metal or some other suitable material, may be solid or hollow and must have a natural frequency lying outside the frequencies to be listened to.
  • the outer edge of the washer 4 is fixed to the rim of the case 1.
  • the inertia device and the diaphragm 2 enclose an air chamber 6, which communicates through the passage 7 with the inside of a tubular diaphragm 8.
  • the latter is fixed at its upper end to a tube 9, the threaded part of which passes through the plug 10 and the rotary knob 11 and terminates in a collar 12 on which is fastened the listening tube of a stethoscope (not illustrated in the drawing).
  • the tubular diaphragm 8 may be stretched to a greater or lesser degree by operating the rotary knob 11, thus simultaneously limiting the movability of the element 3, which is resilently held by the washer 4, and thus also influencing the tension of the plane diaphragm 2. Since the washer 5 is perforated, the tubular diaphragm 8 is situated in the air chamber 13, which is delimited by the case 1 and the element 3.
  • Chamber 13 and (c) The chamber which is formed inside the ring 14 between diaphragm 2 and the body under examination.
  • knob 11 will cause simultaneous modification of the tension exerted through tubular diaphragm 8 on the inertia mass 3, and of the ratio of pressure within 13 to pressure 6, 7, 8, 12 hearing tubes to pressure within 14 between 2 and the body of the patient, and that said modification causes the adjustment in question.
  • the cylindrical part is pressed against the skin for the purpose of stretching it and rendering the apparatus solid with the body to be sounded.
  • said cylindrical part is fastened on the rim of the case 1 by an appropriate means, for example by crimping.
  • a palpater may, in accordance with current practice, be fastened to the plane diaphragm 2 to localise the sounds.
  • a medical acoustic device comprising in combination a housing, a plane diaphragm closing the bottom of the housing, an element resiliently supported in said housing above said plane diaphragm and forming a first cham-' ber therebetween, a tubular diaphragm fixed to the top of said element to communicate between the said first chamber and the top of the housing, and a second chamber formed between the said element and the top and side walls of said housing.

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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)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Headphones And Earphones (AREA)
  • Toys (AREA)
US2836255D 1954-12-28 Reichardt Expired - Lifetime US2836255A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE1049046X 1954-12-28

Publications (1)

Publication Number Publication Date
US2836255A true US2836255A (en) 1958-05-27

Family

ID=3892822

Family Applications (1)

Application Number Title Priority Date Filing Date
US2836255D Expired - Lifetime US2836255A (en) 1954-12-28 Reichardt

Country Status (5)

Country Link
US (1) US2836255A (xx)
BE (1) BE534484A (xx)
DE (1) DE1049046B (xx)
FR (1) FR1120278A (xx)
GB (1) GB783945A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022099380A1 (en) * 2020-11-13 2022-05-19 Stylascope Holdings Pty Ltd Stethoscope

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH691757A5 (de) * 1997-05-13 2001-10-15 Artemio Granzotto Stethoskopkopf.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755880A (en) * 1953-08-20 1956-07-24 Acoustic devices

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657354A (xx) * 1900-01-01
US2095247A (en) * 1937-10-12 Stethoscope
GB619640A (xx) * 1900-01-01
US2363686A (en) * 1943-10-29 1944-11-28 Harry F. Olson Acoustic Stethoscope

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755880A (en) * 1953-08-20 1956-07-24 Acoustic devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022099380A1 (en) * 2020-11-13 2022-05-19 Stylascope Holdings Pty Ltd Stethoscope

Also Published As

Publication number Publication date
BE534484A (xx)
FR1120278A (xx)
GB783945A (xx)
DE1049046B (de) 1959-01-22

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