GB1008027A - Improvements in or relating to cardiophone arrangements - Google Patents

Improvements in or relating to cardiophone arrangements

Info

Publication number
GB1008027A
GB1008027A GB3147063A GB3147063A GB1008027A GB 1008027 A GB1008027 A GB 1008027A GB 3147063 A GB3147063 A GB 3147063A GB 3147063 A GB3147063 A GB 3147063A GB 1008027 A GB1008027 A GB 1008027A
Authority
GB
United Kingdom
Prior art keywords
frequency
microphone
sound wave
frequency modulated
cylinder
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
GB3147063A
Inventor
Wilfred Linden Mortley
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.)
BAE Systems Electronics Ltd
Original Assignee
BAE Systems Electronics 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 BAE Systems Electronics Ltd filed Critical BAE Systems Electronics Ltd
Priority to GB3147063A priority Critical patent/GB1008027A/en
Publication of GB1008027A publication Critical patent/GB1008027A/en
Application status is Expired legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/43Detecting, measuring or recording for evaluating the reproductive systems
    • A61B5/4306Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
    • A61B5/4343Pregnancy and labour monitoring, e.g. for labour onset detection
    • A61B5/4362Assessing foetal parameters
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/0002Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/02Detecting, 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
    • A61B5/024Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02411Detecting, measuring or recording pulse rate or heart rate of foetuses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00Instruments for auscultation
    • A61B7/02Stethoscopes
    • A61B7/04Electric stethoscopes

Abstract

1,008,027. Stethoscopes; microphones; radio signalling. MARCONI CO. Ltd. July 30, 1964 [Aug. 9, 1963], No. 31470/63. Headings H4J and H4L. In a cardiophone the output from a microphone is translated into a frequency modulated carrier signal and this signal is translated into a correspondingly frequency modulated sound wave having its mid-frequency in a sensitive part of the spectrum of human hearing. A capacitor microphone 3 (Fig. 1), designed to pick up foetal heart-beat sounds in the range 5 to 50 c/s. forms part of a frequency determining resonant circuit 2 which, together with a transistor 1, acts as a generator with a mid-frequency of between 800 and 1,200 c/s. Frequency modulated oscillations produced by variations of the amplitude of response of the microphone 3 are fed to a unit 4 including low power amplifying and radio transmitting apparatus. A capacity or loop aerials may be used. An apparatus 7 recovers the frequency modulated wave and applies it to a loud-speaker or headphones 8. The frequency modulated carrier signal and the frequency modulated sound wave may be of the same or different frequency. The mid-frequency of the sound wave may be adjusted by a heterodyne circuit. The radio link may be replaced by a flexible connector. Alternatively, the microphone, generator and sound reproducer may be a single unit adapted to be placed on a patient. Where the apparatus is in two parts the transmitting link may be a supersonic sound wave channel or an audible sound wave channel. Risk of " howling " is reduced by the arrangement and may be further reduced by filtering. Microphone.-An inertia controlled capacitor microphone is used and includes a fixed electrode plate 32 (Fig. 2) and a movable electrode 36. The electrode 36 is secured on a heavy cylinder 37 supported in a cylindrical casing 31 by springs 38. The resonance frequency of the cylinder 37 with its springs 38 is a few cycles per second and is critically damped by air flow friction between the cylinder 37 and casing 31. Alternatively, electrical or mechanical damping may be used. Eddy current damping may be obtained by making the cylinder 37, or part of of it, in the form of a magnet the field of which penetrates the outer cylinder 31, A stem 33, insulation 34 and a collar 35 form a socket to receive a plug (not shown).
GB3147063A 1963-08-09 1963-08-09 Improvements in or relating to cardiophone arrangements Expired GB1008027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3147063A GB1008027A (en) 1963-08-09 1963-08-09 Improvements in or relating to cardiophone arrangements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3147063A GB1008027A (en) 1963-08-09 1963-08-09 Improvements in or relating to cardiophone arrangements
SE9672/64A SE320760B (en) 1963-08-09 1964-08-10

Publications (1)

Publication Number Publication Date
GB1008027A true GB1008027A (en) 1965-10-22

Family

ID=10323572

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3147063A Expired GB1008027A (en) 1963-08-09 1963-08-09 Improvements in or relating to cardiophone arrangements

Country Status (2)

Country Link
GB (1) GB1008027A (en)
SE (1) SE320760B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565058A (en) * 1967-10-04 1971-02-23 Peter B Mansfield Monitoring apparatus with audio output frequency responsive to ekg signal amplitude
US3774594A (en) * 1972-01-06 1973-11-27 Pioneer Medical Systems Inc Apparatus for telemetering of ekg signals from mobile stations
US3830227A (en) * 1966-05-17 1974-08-20 H Green Hand-held cardiac sound tone diagnostic device and method
US4121573A (en) * 1973-10-04 1978-10-24 Goebel Fixture Co. Wireless cardiac monitoring system and electrode-transmitter therefor
US4178916A (en) * 1977-09-26 1979-12-18 Mcnamara Elger W Diabetic insulin alarm system
FR2452911A1 (en) * 1979-04-04 1980-10-31 Svedman Paul Patient's lung and heart function monitoring device - has several sound scanners which can be applied applicable to patient's skin, and amplified central receiver with connections
US4248241A (en) * 1979-08-17 1981-02-03 Tacchi Ernest J Patient monitoring apparatus
FR2768323A1 (en) * 1997-09-18 1999-03-19 Berrehail Mohammed System for transmitting cardiac and respiratory noise from a patient to a remote observer
CN104887240A (en) * 2015-06-19 2015-09-09 传世未来(北京)信息科技有限公司 Method and device for monitoring heart sound signal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE463065B (en) * 1989-02-06 1990-10-01 Hoek Instr Ab Microphone Foer absorption of body sounds
FI98981C (en) * 1994-10-28 1997-09-25 Tommi Sakari Lukkarinen A hand-held recorder audio visual stethoscope

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3830227A (en) * 1966-05-17 1974-08-20 H Green Hand-held cardiac sound tone diagnostic device and method
US3565058A (en) * 1967-10-04 1971-02-23 Peter B Mansfield Monitoring apparatus with audio output frequency responsive to ekg signal amplitude
US3774594A (en) * 1972-01-06 1973-11-27 Pioneer Medical Systems Inc Apparatus for telemetering of ekg signals from mobile stations
US4121573A (en) * 1973-10-04 1978-10-24 Goebel Fixture Co. Wireless cardiac monitoring system and electrode-transmitter therefor
US4178916A (en) * 1977-09-26 1979-12-18 Mcnamara Elger W Diabetic insulin alarm system
FR2452911A1 (en) * 1979-04-04 1980-10-31 Svedman Paul Patient's lung and heart function monitoring device - has several sound scanners which can be applied applicable to patient's skin, and amplified central receiver with connections
US4248241A (en) * 1979-08-17 1981-02-03 Tacchi Ernest J Patient monitoring apparatus
FR2768323A1 (en) * 1997-09-18 1999-03-19 Berrehail Mohammed System for transmitting cardiac and respiratory noise from a patient to a remote observer
CN104887240A (en) * 2015-06-19 2015-09-09 传世未来(北京)信息科技有限公司 Method and device for monitoring heart sound signal

Also Published As

Publication number Publication date
SE320760B (en) 1970-02-16

Similar Documents

Publication Publication Date Title
US3592967A (en) Ultrasonic detector
US3134861A (en) Transducer support apparatus
US3218607A (en) Underwater telephone
EP0092822B1 (en) Ear microphone
US5528697A (en) Integrated vibrating and sound producing device
JP3174324B2 (en) Ultrasonic bone conduction hearing aids and hearing aid method
DE69233156T2 (en) Improved hearing aid
US3952158A (en) Ear protection and hearing device
US3182129A (en) Clark etal electronic stethoscope
US4504703A (en) Electro-acoustic transducer
EP0385713A2 (en) Noise reducing receiver device
US5119072A (en) Apparatus for monitoring child activity
US2535063A (en) Communicating system
US3457375A (en) Hearing aid mechanisms that are largely impervious to the leakage of sound energy at audio frequencies
US5751827A (en) Piezoelectric speaker
US3882285A (en) Implantable hearing aid and method of improving hearing
US5867582A (en) Headphone
US2485405A (en) Dipole microphone
DK176339B1 (en) Hearing aid with induction coil and method for reducing magnetic noise fields
US4239945A (en) Sealed headphone
US4109116A (en) Hearing aid receiver with plural transducers
US3944756A (en) Electret microphone
US5953414A (en) Piezo-electric speaker capsule for telephone handset
US3123678A (en) Prent
US4025734A (en) Ambient noise shielded ear transceiver