Surgery – Truss – Pad
Patent
1977-03-04
1978-12-12
Kamm, William E.
Surgery
Truss
Pad
A61N 136
Patent
active
041291336
ABSTRACT:
A heart pacemaker for generating a heart stimulation signal in the apparent absence of any heart stimulation signal during a given duration of time, includes an interference detecting device for sensing intracardiac voltage signals which generate, respectively, first and second signals.
A retriggerable monostable first multivibrator is responsive to a trigger signal, so as to determine a first period of time, and, a second multivibrator is coupled to the first multivibrator, so as to operate for initiating a second period of time; the appearance of the second signals inhibits the heart stimulation signal; the first signal is generated in response to the sensing of one of the intracardiac voltage signals, and the second signals are generated whenever one of the intracardiac voltage signals is not succeeded by another voltage signal during the predetermined first period of time.
A generating device coupled to the detecting means may be operated for generating the heart stimulation signal at the completion of the occurrence of one of the second signals and may be operated to have the second period of time interrupted in response to the occurrence of a further one of the second signals.
REFERENCES:
patent: 3949759 (1976-04-01), Brownlee et al.
patent: 3972334 (1976-08-01), Wickham
patent: 3985142 (1976-10-01), Wickham
patent: 4023121 (1977-05-01), Alley
patent: 4043347 (1977-08-01), Renirie
DE Bakker Jacques
Irnich Werner
Kamm William E.
Marmorek Ernest F.
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