GB501819A - - Google Patents

Info

Publication number
GB501819A
GB501819A GB501819DA GB501819A GB 501819 A GB501819 A GB 501819A GB 501819D A GB501819D A GB 501819DA GB 501819 A GB501819 A GB 501819A
Authority
GB
United Kingdom
Prior art keywords
rubber
crystal
piezo
money
cup
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
Application number
Publication date
Publication of GB501819A publication Critical patent/GB501819A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00—Instruments for auscultation
    • A61B7/02—Stethoscopes

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

501,819. Stethoscopes ; piezo-electric crystal mountings. MONEY, R. W., and MONEY, R. Sept. 6, 1937, No. 24310. [Class 40 (iv)] [Also in Group XL] In an electrical stethoscope, a piezo-electric crystal microphone is provided with a vibration transmittuig-member adapted to be placed directly on the body and is mounted so that it is insulated from airborne sound and from local electrical interference. The crystal 1, which is preferably of Rochelle salt, is secured by three rubber feet to a base member 5 and carries a rod or stylus member 6. A cup 9 having a space in one wall for locating one carrier of the crystal unit-is provided with a disc 10 having a rubber annulus 11 surrounding the member 6. The cup 9 is mounted in a wooden bell 13 by means of a ring 12 and blocks 14 of rubber and the leads 17 are passed through a rubber-bushing 18 and are attached to the wall of an extension 13<SP>1</SP> of the bell 13. A cable 15 connecting the microphone to an amplifier is passed through a rubber ring 16 and the sheathing is connected by a wire 20 to a brass earthing sleeve 19. The oscillations of the crystal at high audio-frequencies are damped by a pad 21 of resilient material such as soft rubber or a cellulose jelly having the consistency of rubber.
GB501819D Expired GB501819A (en)

Publications (1)

Publication Number Publication Date
GB501819A true GB501819A (en) 1900-01-01

Family

ID=1747494

Family Applications (1)

Application Number Title Priority Date Filing Date
GB501819D Expired GB501819A (en)

Country Status (1)

Country Link
GB (1) GB501819A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017897A1 (en) * 1995-11-16 1997-05-22 Meditron A/S Pick-up head for an electronic stethoscope

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017897A1 (en) * 1995-11-16 1997-05-22 Meditron A/S Pick-up head for an electronic stethoscope
AU708442B2 (en) * 1995-11-16 1999-08-05 Meditron As Pick-up head for an electronic stethoscope
EA000641B1 (en) * 1995-11-16 1999-12-29 Медитрон А/С Pick-up head for electronic stethoscope
US6324289B2 (en) 1995-11-16 2001-11-27 Meditron A/S Pick-up head for an electronic stethoscope

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