Device for stimulating periodic functions of the body

摘要: 826,766. Cardiac stimulators. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Dec. 6, 1957 [Dec. 1956], No. 37400/56. Class 81 (2). [Also in Group XL (c)] A cardiac stimulator comprises electrical impulse generating means, which delivers impulses at predetermined time intervals, and has means for regulating the intervals responsive to an externally applied signal disabling delivering a period, being arranged on receipt of further during period hold disabled duration. As shown, timing circuit includes gas tube V2 has, addition main cathode anode, priming anode trigger electrode connected across high-tension supply, form either battery HTB or direct current supply from mains. When switch S1 is closed, capacitor C3 charges through resistors R6, R7 second C4 R9, R11. charged up breakdown potential gap, latter fires conducts so that discharges relay D thus momentarily operating contacts dl disconnect supply. On extinction are again made cycle repeated. The primarily controlled by constant first adjusted normal rate heart beats. neon V3 normally when closed but extinguished same as serving visual indication operation circuit. Capacitors C8, C9, C10 producing selectively parallel high tension potentiometer R13, circuit, selected C9 disconnected d2 patient terminals OP. capacitors have different values range 1-4 Afds. cut-out having input IP electrocardiagraph other heart-responsive e.g. transistor, double triode V1 operable only disable circuits 6 secs. if makes spontaneous beat. Relays A, B each half VIa, VIb respectively cut off. " R-wave due beat reaches grid part energized a1 connect C2 associated with b1 C2, R4, R5 such held open If received this operates sees. To prevent responding generated d3 energized. In cases where beats tend occur step pulses, pulse out periodically, selector move one position selector, reached established another disconnects circuits, them, simultaneously closes contact received, before may be polarity electrodes reversed periodically.