GB893939A - Improvements in apparatus for use in stethoscopy - Google Patents

Improvements in apparatus for use in stethoscopy

Info

Publication number
GB893939A
GB893939A GB893939DA GB893939A GB 893939 A GB893939 A GB 893939A GB 893939D A GB893939D A GB 893939DA GB 893939 A GB893939 A GB 893939A
Authority
GB
United Kingdom
Prior art keywords
harmonic
harmonic converter
signals
low
converter
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
Inventor
Derek Howell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Faraday Electronic Instruments Ltd
Original Assignee
Faraday Electronic Instruments Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Faraday Electronic Instruments Ltd filed Critical Faraday Electronic Instruments Ltd
Publication of GB893939A publication Critical patent/GB893939A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/43—Detecting, measuring or recording for evaluating the reproductive systems
    • A61B5/4306—Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
    • A61B5/4343—Pregnancy and labour monitoring, e.g. for labour onset detection
    • A61B5/4362—Assessing foetal parameters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02411—Detecting, measuring or recording pulse rate or heart rate of foetuses
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • Pregnancy & Childbirth (AREA)
  • Gynecology & Obstetrics (AREA)
  • Acoustics & Sound (AREA)
  • Cardiology (AREA)
  • Pediatric Medicine (AREA)
  • Reproductive Health (AREA)
  • Physiology (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

893,939. Stethoscopes. FARADAY ELECTRONIC INSTRUMENTS Ltd. Aug. 31, 1960 [Sept. 4, 1959], No. 30270/59. Class 40 (4). In stethoscopic apparatus including a microphone 1, an amplifier 6 and a sound reproducer 7, the microphone output is connected to a frequency doubler 3 or other harmonic converter. The harmonic signals may pass through a low-pass filter 4 which cuts-out frequency components above 200 cycles per second and acts as a feedback trap. A potentiometer 5 has a slider 5a which may be positioned so that substantially only the output from the harmonic converter is applied to the loud-speaker, or so that the harmonic converter and low-pass filter are substantially by-passed. In intermediate positions of the slider 5a the loudspeaker is fed partly with signals from the harmonic converter and partly with signals by-passing the harmonic converter. The frequency doubler employs crystal diodes in a full-wave or bridge circuit. The stethoscope is for listening to weak low-frequency sounds such as the heart beats of an unborn baby. Specification 798,825 is referred to.
GB893939D 1959-09-04 1959-09-04 Improvements in apparatus for use in stethoscopy Expired GB893939A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB893939T 1959-09-04

Publications (1)

Publication Number Publication Date
GB893939A true GB893939A (en) 1962-04-18

Family

ID=32982833

Family Applications (1)

Application Number Title Priority Date Filing Date
GB893939D Expired GB893939A (en) 1959-09-04 1959-09-04 Improvements in apparatus for use in stethoscopy

Country Status (1)

Country Link
GB (1) GB893939A (en)

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