GB826766A - Device for stimulating periodic functions of the body - Google Patents
Device for stimulating periodic functions of the bodyInfo
- Publication number
- GB826766A GB826766A GB3740056A GB3740056A GB826766A GB 826766 A GB826766 A GB 826766A GB 3740056 A GB3740056 A GB 3740056A GB 3740056 A GB3740056 A GB 3740056A GB 826766 A GB826766 A GB 826766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- cut
- contacts
- relay
- tube
- 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
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
826,766. Cardiac stimulators. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Dec. 6, 1957 [Dec. 6, 1956], No. 37400/56. Class 81 (2). [Also in Group XL (c)] A cardiac stimulator comprises electrical impulse generating means, which delivers electrical impulses at predetermined time intervals, and has means for regulating the time intervals and means responsive to an externally applied signal for disabling the impulse delivering means for a predetermined period, the disabling means being arranged on receipt of a further externally applied signal during the period to hold the impulse delivering means disabled during a further period of predetermined duration. As shown, a timing circuit includes a gas tube V2 which has, in addition to the main cathode and anode, a priming anode and a trigger electrode connected across a high-tension supply, in the form of either a battery HTB or a direct current supply from the mains. When main switch S1 is closed, a capacitor C3 charges through resistors R6, R7 and a second capacitor C4 charges through resistors R9, R11. When C3 has charged up to the breakdown potential of the trigger gap, the latter fires and the tube V2 conducts so that the second capacitor C4 discharges through a relay D in the anode circuit of the tube V2 thus momentarily operating contacts dl to disconnect the tube V2 from the high-tension supply. On extinction of the tube V2 contacts dl are again made and the cycle is repeated. The cycle period is primarily controlled by the time constant of the first capacitor C3 which is adjusted to the normal rate of heart beats. A neon tube V3 normally discharges when switch S1 is closed but is extinguished at the same time as tube V2 thus serving as a visual indication of the operation of the timing circuit. Capacitors C8, C9, C10 in an impulse producing circuit are selectively connected in parallel across the high tension supply through a potentiometer R13, On operation of the relay D in the timing circuit, the selected capacitor C8, C9 or C10 is disconnected from the high-tension supply and connected momentarily by contacts d2 to patient electrode terminals OP. The capacitors C8, C9, C10 have different values in the range of 1-4 Áfds. A cut-out circuit having input terminals IP connected to an electrocardiagraph or other heart-responsive means, e.g. a transistor, includes a double triode V1 and is operable only when the high-tension supply is from the mains. The cut-out circuit is arranged to disable the impulse producing and timing circuits for a period of 6 secs. if the heart makes a spontaneous beat. Relays A, B are connected in the cathode circuits of each half VIa, VIb respectively of the double triode which is normally at cut off. When an " R-wave " due to a spontaneous heart beat reaches the grid of the triode part VIa, the relay A is energized and contacts a1 connect a capacitor C2 associated with the grid of the part VIb across the high-tension supply so that the relay B is energized to disconnect contacts b1 in the timing circuit. The time constant C2, R4, R5 is such that contacts b1 are held open for 6 secs. If a second " R-wave " is received in this period, the cut-out circuit operates for a further 6 sees. To prevent the cut-out circuit responding to impulses generated by the impulse producing circuit, contacts d3 in the cut-out circuit are disconnected when the relay D is energized. In cases where spontaneous heart beats tend to occur in step with the stimulator pulses, the stimulator pulse is cut out periodically, a selector being arranged to move one step each time the relay D in the timing circuit is energized. In one position of the selector, reached periodically, a circuit is established through another relay which disconnects contacts in the impulse producing circuits, thus disabling them, and simultaneously closes a contact in the cut-out circuit so that if an " R-wave " due to a spontaneous heart beat is received, the cut-out circuit operates as before to disable the timing and impulse producing circuits for 6 secs. The impulse producing circuit may be arranged so that the polarity of the patient electrodes is reversed periodically.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3740056A GB826766A (en) | 1956-12-06 | 1956-12-06 | Device for stimulating periodic functions of the body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3740056A GB826766A (en) | 1956-12-06 | 1956-12-06 | Device for stimulating periodic functions of the body |
Publications (1)
Publication Number | Publication Date |
---|---|
GB826766A true GB826766A (en) | 1960-01-20 |
Family
ID=10396185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3740056A Expired GB826766A (en) | 1956-12-06 | 1956-12-06 | Device for stimulating periodic functions of the body |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB826766A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3236239A (en) * | 1962-07-17 | 1966-02-22 | American Optical Corp | Defibrillator |
US3345990A (en) * | 1964-06-19 | 1967-10-10 | American Optical Corp | Heart-beat pacing apparatus |
US3389704A (en) * | 1965-12-06 | 1968-06-25 | Zenith Radio Corp | Discharge circuit for a defibrillator |
US3391697A (en) * | 1965-09-20 | 1968-07-09 | Medtronic Inc | Runaway inhibited pacemaker |
US3431912A (en) * | 1966-05-06 | 1969-03-11 | Cordis Corp | Standby cardiac pacer |
US3433228A (en) * | 1966-05-06 | 1969-03-18 | Cordis Corp | Multimode cardiac pacer |
US3460542A (en) * | 1966-02-09 | 1969-08-12 | Hellige & Co Gmbh F | Instrument for electrically stimulating the activity of the heart |
US3478746A (en) * | 1965-05-12 | 1969-11-18 | Medtronic Inc | Cardiac implantable demand pacemaker |
US3518996A (en) * | 1967-04-17 | 1970-07-07 | Eloy Cortina | Muscle stimulator |
US3773049A (en) * | 1970-11-13 | 1973-11-20 | L Rabichev | Apparatus for the treatment of neuropsychic and somatic diseases with heat, light, sound and vhf electromagnetic radiation |
US4030510A (en) * | 1970-03-10 | 1977-06-21 | General Electric Company | Standby heart pacer |
US4203448A (en) * | 1977-08-19 | 1980-05-20 | Biotronik Mess- Und Therapiegerate Gmbh & Co. | Programmably variable voltage multiplier for implanted stimulator |
USRE30750E (en) | 1972-05-15 | 1981-09-29 | Cardiac Resuscitator Corporation | Cardiac resuscitator and monitoring apparatus |
US4321928A (en) * | 1979-09-27 | 1982-03-30 | Siemens Aktiengesellschaft | Heart pacemaker |
-
1956
- 1956-12-06 GB GB3740056A patent/GB826766A/en not_active Expired
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3236239A (en) * | 1962-07-17 | 1966-02-22 | American Optical Corp | Defibrillator |
DE1296283B (en) * | 1964-06-19 | 1974-05-30 | ||
US3345990A (en) * | 1964-06-19 | 1967-10-10 | American Optical Corp | Heart-beat pacing apparatus |
DE1296283C2 (en) * | 1964-06-19 | 1974-05-30 | American Optical Corp., Southbridge, Mass. (V.St.A.) | ARRANGEMENT FOR ACHIEVING A REGULAR HEART RATE |
US3478746A (en) * | 1965-05-12 | 1969-11-18 | Medtronic Inc | Cardiac implantable demand pacemaker |
US3391697A (en) * | 1965-09-20 | 1968-07-09 | Medtronic Inc | Runaway inhibited pacemaker |
US3389704A (en) * | 1965-12-06 | 1968-06-25 | Zenith Radio Corp | Discharge circuit for a defibrillator |
US3460542A (en) * | 1966-02-09 | 1969-08-12 | Hellige & Co Gmbh F | Instrument for electrically stimulating the activity of the heart |
US3431912A (en) * | 1966-05-06 | 1969-03-11 | Cordis Corp | Standby cardiac pacer |
US3433228A (en) * | 1966-05-06 | 1969-03-18 | Cordis Corp | Multimode cardiac pacer |
US3518996A (en) * | 1967-04-17 | 1970-07-07 | Eloy Cortina | Muscle stimulator |
US4030510A (en) * | 1970-03-10 | 1977-06-21 | General Electric Company | Standby heart pacer |
US3773049A (en) * | 1970-11-13 | 1973-11-20 | L Rabichev | Apparatus for the treatment of neuropsychic and somatic diseases with heat, light, sound and vhf electromagnetic radiation |
USRE30750E (en) | 1972-05-15 | 1981-09-29 | Cardiac Resuscitator Corporation | Cardiac resuscitator and monitoring apparatus |
US4203448A (en) * | 1977-08-19 | 1980-05-20 | Biotronik Mess- Und Therapiegerate Gmbh & Co. | Programmably variable voltage multiplier for implanted stimulator |
US4321928A (en) * | 1979-09-27 | 1982-03-30 | Siemens Aktiengesellschaft | Heart pacemaker |
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