GB1273835A - Improvements in and relating to cardiac apparatus - Google Patents

Improvements in and relating to cardiac apparatus

Info

Publication number
GB1273835A
GB1273835A GB59251/69A GB5925169A GB1273835A GB 1273835 A GB1273835 A GB 1273835A GB 59251/69 A GB59251/69 A GB 59251/69A GB 5925169 A GB5925169 A GB 5925169A GB 1273835 A GB1273835 A GB 1273835A
Authority
GB
United Kingdom
Prior art keywords
reverse charging
cardiac
capacitors
preventing
diodes
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
GB59251/69A
Inventor
Joseph Spencer
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.)
Cardiac Recorders Ltd
Original Assignee
Cardiac Recorders 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 Cardiac Recorders Ltd filed Critical Cardiac Recorders Ltd
Priority to GB59251/69A priority Critical patent/GB1273835A/en
Publication of GB1273835A publication Critical patent/GB1273835A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3904—External heart defibrillators [EHD]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3906—Heart defibrillators characterised by the form of the shockwave
    • A61N1/3912—Output circuitry therefor, e.g. switches

Abstract

1,273,835. Defibrillators. CARDIAC RECORDERS Ltd. 19 April, 1971 [4 Dec., 1969], No. 59251/69. Heading A5R. A cardiac defibrillator comprises an electrolytic capacitor 1, an inductor 3 and a discharge switch 4 connected in series with the patients chest 7 by means of contacts 5, 6, and means of preventing the reverse charging of the capacitor which would otherwise occur when the switch 4 is closed due to the oscillatory current in the L.C. circuit formed. As shown, a plurality of capacitors 1 may be used, with diodes 2 as a means of preventing reverse charging. Alternatively in Fig. 4, not shown, Zener diodes (10) are used to prevent reverse charging, the Zener diodes also serving as a safety device to limit the voltage to which the capacitors are charged.
GB59251/69A 1969-12-04 1969-12-04 Improvements in and relating to cardiac apparatus Expired GB1273835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB59251/69A GB1273835A (en) 1969-12-04 1969-12-04 Improvements in and relating to cardiac apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB59251/69A GB1273835A (en) 1969-12-04 1969-12-04 Improvements in and relating to cardiac apparatus

Publications (1)

Publication Number Publication Date
GB1273835A true GB1273835A (en) 1972-05-10

Family

ID=10483385

Family Applications (1)

Application Number Title Priority Date Filing Date
GB59251/69A Expired GB1273835A (en) 1969-12-04 1969-12-04 Improvements in and relating to cardiac apparatus

Country Status (1)

Country Link
GB (1) GB1273835A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees