Surgery – Truss – Pad
Patent
1975-01-14
1976-10-12
Kamm, William E.
Surgery
Truss
Pad
A61N 136
Patent
active
039851427
ABSTRACT:
A heart pacer providing heart stimulating electrical impulses in the absence of naturally occurring heartbeats, together with means to prevent inhibition of the electrical impulse in the presence of electrical interference signals of either physiological or nonphysiological origin. Logic functions are incorporated to detect the presence of any sensed signal occurring after a first predetermined time but earlier than a second predetermined time, both measured from the preceding detected signal which may be either a natural heartbeat, a stimulating electrical impulse, or an interference signal. The first predetermined time interval is greater than the time duration of the electrical manifestations of a single heartbeat while the second predetermined time interval is less than the interval between two natural heartbeats. Sensed signals are delayed before triggering the demand function. Upon detection of one or more signals after the first time interval but prior to the end of the second, a latch is activated to disable the inhibit function before that function can be triggered by the interference signal. The latch is held active until deactivated after a predetermined time period or until the next heart stimulating impulse is delivered.
REFERENCES:
patent: 3171892 (1965-03-01), Pantle
patent: 3431912 (1969-03-01), Keller, Jr.
patent: 3661157 (1972-05-01), Fyson et al.
patent: 3759266 (1973-09-01), Lee
Kamm William E.
Telectronics Pty. Limited
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