US2001537A - Stethoscope - Google Patents
Stethoscope Download PDFInfo
- Publication number
- US2001537A US2001537A US2001537DA US2001537A US 2001537 A US2001537 A US 2001537A US 2001537D A US2001537D A US 2001537DA US 2001537 A US2001537 A US 2001537A
- Authority
- US
- United States
- Prior art keywords
- disc
- contact
- microphone
- cylinder
- sounds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 210000003165 Abomasum Anatomy 0.000 description 8
- 235000014676 Phragmites communis Nutrition 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000011810 insulating material Substances 0.000 description 4
- 210000004072 Lung Anatomy 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
- A61B7/04—Electric stethoscopes
Description
y 14, c. A. MASON 2,001,537
STETHOSCOPE v Filed March 3, 1934 Inventor:
bg fiasoc,
His At torneg.
Patented a, is, was
- UNITED STATES PATENT OFFICE signor to General Electric Company, a corporation of New York Application March 3, 1934, Serial No. 713,908
'sciaims.
This invention relates to stethoscopes and has for its object to provide an electrically operated stethoscope which will be much more sensitive than such instruments as are already in use.
This instrument consists in providing means for transmitting sounds from the interior oi the human body, such as the beating oi the heart or the passage 01' air through the lungs, to a microphone -and in providing means for amplifying these sounds to any desired extent.
The accompanying drawing illustrates one method of carrying this invention into eii'ect.
In this form I provide a microphone i which is preferably of the moving iron or reed type. This microphone is mounted in resilient material such as spongy rubber 2 in an iron box 3 for screening purposes. The reed 4 is connected either directly or through a resilient support 5 to a rod 8 which carries at its outer end a. disc I 01' heat insulating material, which conveys the impulses from the body to the microphone by direct contact. This contact disc is protected by a heat insulating cylinder 8 which surrounds it and normally projects a slightly greater distance from the casing oi the instrument than the disc. Heat insulating material is used in preference to metal in order to prevent cold metal coming in contact with the body. The insulating cylinder slides inside a metal cylinder 6 secured to the casing I of the instrument and is normally held in its outermost position by means of springs it. The insulating cylinder may be held against rotation by means of one or more guide pins ii operating in longitudinal grooves or slots iia formed in the cylinder, and these pins may be utilised to limit the outwardmovement o! the cylinder.
The microphone is connected through a switch including a pair of contacts I! and through leads II to an amplifier represented by the rectangle ii, the output oi which may be connected to a telephone or other suitable sound receiving device as indicated by the numeral ll.
n operation the insulating cylinder 0 is pressed W the body or the .patient and slides into the metal cylinder I against the actioii oi the springs ll normally'holdingit in its outermost position. This movement 01' the cylinder ilrst brings the contact disc I into contact with the patient's bodyand the further limited t insures good, contact which will always be substantially the The inward} tortheinsulatingcylinderalsocioses thehlli'otemtaotsliloeatedlnthefllament" circuitottheamplinerllandao'uiablesthe Great Britain March 8, 1938 atre, a loud-speaker may take the place of the 10 head-phones.
,What I claim as new and desire to secure by Letters Patent of the United States, is:
1. In a stethoscopic apparatus, a microphonic device including a movable member, a disc adapt- 16 ed to be pressed into contact with a body thereby to be vibrated by sounds to be transmitted from said body, means to transmit the vibrations of said disc to said movable member, and means to maintain substantially constant the pressure oi said 20 disc against said body. C
2. In a stethoscopic apparatus, a microphonic device having a movable iron member, a disc adapted to be brought into contact with a body thereby to be vibrated by sounds to be tram initted from said body, means to transmit the vibrations of said disc to said movable iron memher, a protecting sleeve surrounding said disc, and a circuit closing means, said sleeve being slidable to uncover said disc and to operate said circult closing means.
3. In a stethoscopic apparatus, a microphonic device having a movable reed, a disc adapted to be pressed into contact with a body therebyto be vibrated by sounds to be transmitted irom said body, means to transmit the vibrations oi said disc to said reed, and a protecting sleeve surrounding said disc, said sleeve being slidable to uncover said disc, and means to limit the sliding movement of said sleeve whereby the pressure oisaiddisconsaidbody issubstantiallyuniform.
4. In a stethoscopic apparatus, a microphone having a movable member, a contact member adapted to be pressed asainst'a body thereby to be vibrated by sounds tobe trammittcd from said body, means to connect said contact member to said movable member, and a protecting member surrounding said contact member and slidable a predetermined distance to uncover said contact'member whereby the pressure of said contact member on said body is substantially uniform.
5. In a stethoscopicapparatus, a microphone. having a movable member, a contact umber as distancewtwardlytromsaidcasinx,andmeans' to limit the travel ,0! said protecting member toward said casing whereby the pressure of said contact member against said body is maintained substantially unitorm when said stethoscopic ap- 5 paratus is applied to said body.
cyan. ARTHUR Mason.
Publications (1)
Publication Number | Publication Date |
---|---|
US2001537A true US2001537A (en) | 1935-05-14 |
Family
ID=3427071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US2001537D Expired - Lifetime US2001537A (en) | Stethoscope |
Country Status (1)
Country | Link |
---|---|
US (1) | US2001537A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419471A (en) * | 1947-04-22 | Amplified stethoscope | ||
US2648328A (en) * | 1950-01-28 | 1953-08-11 | Hathaway Instr Company | Electric blood pressure recording system |
US2989597A (en) * | 1955-06-30 | 1961-06-20 | John A Victoreen | High fidelity sound translating apparatus |
US3187098A (en) * | 1961-03-30 | 1965-06-01 | Bruce Peebles & Co Ltd | Foetal heart-beat detector |
US3541590A (en) * | 1965-06-24 | 1970-11-17 | Manitoba Dev Fund | Physiological pulse meter |
US3868954A (en) * | 1973-02-10 | 1975-03-04 | Ueda Works Co Ltd | Hemadynamometer microphone |
US5602924A (en) * | 1992-12-07 | 1997-02-11 | Theratechnologies Inc. | Electronic stethescope |
US6026170A (en) * | 1995-11-27 | 2000-02-15 | Minnesota Mining And Manufacturing Company | Electronic stethoscope with idealized bell and idealized diaphragm modes |
-
0
- US US2001537D patent/US2001537A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419471A (en) * | 1947-04-22 | Amplified stethoscope | ||
US2648328A (en) * | 1950-01-28 | 1953-08-11 | Hathaway Instr Company | Electric blood pressure recording system |
US2989597A (en) * | 1955-06-30 | 1961-06-20 | John A Victoreen | High fidelity sound translating apparatus |
US3187098A (en) * | 1961-03-30 | 1965-06-01 | Bruce Peebles & Co Ltd | Foetal heart-beat detector |
US3541590A (en) * | 1965-06-24 | 1970-11-17 | Manitoba Dev Fund | Physiological pulse meter |
US3868954A (en) * | 1973-02-10 | 1975-03-04 | Ueda Works Co Ltd | Hemadynamometer microphone |
US5602924A (en) * | 1992-12-07 | 1997-02-11 | Theratechnologies Inc. | Electronic stethescope |
US6026170A (en) * | 1995-11-27 | 2000-02-15 | Minnesota Mining And Manufacturing Company | Electronic stethoscope with idealized bell and idealized diaphragm modes |
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