GB1378065A - Heart pacers - Google Patents

Heart pacers

Info

Publication number
GB1378065A
GB1378065A GB5359372A GB5359372A GB1378065A GB 1378065 A GB1378065 A GB 1378065A GB 5359372 A GB5359372 A GB 5359372A GB 5359372 A GB5359372 A GB 5359372A GB 1378065 A GB1378065 A GB 1378065A
Authority
GB
United Kingdom
Prior art keywords
capacitor
heart
voltage
beat
natural
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
GB5359372A
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.)
American Optical Corp
Original Assignee
American Optical Corp
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 American Optical Corp filed Critical American Optical Corp
Publication of GB1378065A publication Critical patent/GB1378065A/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
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential

Landscapes

  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Cardiology (AREA)
  • Engineering & Computer Science (AREA)
  • Physiology (AREA)
  • Biophysics (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Electrotherapy Devices (AREA)

Abstract

1378065 Heart pacemakers AMERICAN OPTICAL CORP 20 Nov 1972 [19 Nov 1971] 53593/72 Heading A5R A demand pacer comprises means for continuously monitoring the heart of a patient to provide a signal indicative of the average natural heart-beat rate of the patient and means responsive to the signal for providing a stimulation impulse to the patient when an interval corresponding to the average natural heart-beat rate is exceeded. A naturallyoccurring heart beat is detected by heart-beat detector 45 which provides an input to rate control 46 through OR-gate 70 and resets the timing circuitry in control 46 with each natural heart beat. Natural heart beats cause multivibrator 40 to provide rectangularly-shaped pulses which are averaged by capacitor 26 and resistor 27. A further capacitor 22 and resistor 23 are connected to capacitor 26 through diode 24. Capacitor 22 is also connected via diode 21 with zener diode 20 the voltage of which is selected to provide a desired minimum frequency of oscillator 41 which controls a stimulating pulse generator 42. Due to the opposed diodes 21, 24 the voltage on capacitor 22 rises to the larger of the voltage on capacitor 26, which is indicative of natural heart-beat rate, and breakdown voltage of zener diode 20. If the heart fails, capacitor 26 discharges through resistor 23. The voltage on capacitor 22 is fed to buffer amplifier, comprising transistor 16 and resistors 17, 18, providing a control voltage for oscillator 41 which comprises resistor 15, capacitor 14, transistor 13 and resistors 10-12. When the voltage on capacitor 14 reaches that established by resistors 10, 11, transistor 13 conducts and capacitor 14 discharges to pulse generator 42 which stimulates the heart. Capacitor 14 is also in parallel with the collector-emitter of transistor 28 which is turned on via OR-gate 70 by natural or stimulated heart beats, so that when a natural heart beat occurs capacitor 14 discharges before the voltage or it reaches the threshold value determined by resistors 10, 11 so that the heart is not stimulated. Pulse generator 42 also provides an input for blanking circuitry 44 to prevent detection of stimulated heart beats by detector 45.
GB5359372A 1971-11-19 1972-11-20 Heart pacers Expired GB1378065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00200710A US3807410A (en) 1971-11-19 1971-11-19 Adaptive demand pacer

Publications (1)

Publication Number Publication Date
GB1378065A true GB1378065A (en) 1974-12-18

Family

ID=22742860

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5359372A Expired GB1378065A (en) 1971-11-19 1972-11-20 Heart pacers

Country Status (6)

Country Link
US (1) US3807410A (en)
JP (1) JPS5532387B2 (en)
DE (1) DE2252312C2 (en)
GB (1) GB1378065A (en)
IT (1) IT966409B (en)
ZA (1) ZA727201B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898995A (en) * 1974-03-25 1975-08-12 James Bernard Dresbach Noncompetitive pacemaker with programmable unijunction transistors
US4059116A (en) * 1974-12-09 1977-11-22 Medtronic, Inc. Synchronous pacemaker with upper rate stabilization and method of use
US3999557A (en) * 1975-07-11 1976-12-28 Medtronic, Inc. Prophylactic pacemaker
US4091817A (en) * 1976-09-27 1978-05-30 American Optical Corporation P-Wave control, R-wave inhibited ventricular stimulation device
US4108148A (en) * 1976-11-03 1978-08-22 Sheldon Thaler Pacer with automatically variable A-V interval
EP0007189B1 (en) * 1978-06-23 1982-06-02 Vitafin N.V. Physiologically adaptive cardiac pacemaker
US4305396A (en) * 1979-04-16 1981-12-15 Vitatron Medical B.V. Rate adaptive pacemaker and method of cardiac pacing
DE3175940D1 (en) * 1981-10-26 1987-04-09 Vitafin Nv Programmable cardiac pacemaker
US4665920A (en) * 1984-11-28 1987-05-19 Minnesota Mining And Manufacturing Company Skeletal tissue stimulator and a low voltage oscillator circuit for use therein
JPS63500845A (en) * 1985-03-27 1988-03-31 シ−メンス−エレマ　アクチエボラク Physiological sensor for automatic pacing interval adjustment of cardiac pacemakers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282802B (en) * 1966-02-09 1968-11-14 Fritz Hellige & Co G M B H Fab Device for electrical stimulation of the heart
US3593718A (en) * 1967-07-13 1971-07-20 Biocybernetics Inc Physiologically controlled cardiac pacer
US3528428A (en) * 1968-04-11 1970-09-15 American Optical Corp Demand pacer
US3554188A (en) * 1969-02-27 1971-01-12 Zenith Radio Corp Heartbeat frequency monitor
US3693626A (en) * 1970-11-02 1972-09-26 Adcole Corp Demand pacer with heart rate memory

Also Published As

Publication number Publication date
US3807410A (en) 1974-04-30
DE2252312C2 (en) 1984-05-17
ZA727201B (en) 1973-06-27
JPS4863588A (en) 1973-09-04
IT966409B (en) 1974-02-11
DE2252312A1 (en) 1973-05-30
JPS5532387B2 (en) 1980-08-25

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee