Surgery – Truss – Pad
Patent
1976-11-03
1979-02-20
Kamm, William E.
Surgery
Truss
Pad
A61N 136
Patent
active
041401310
ABSTRACT:
Apparatus for stimulating body tissue and in particular the heart, is disclosed as including a device or circuit responsive to the initiation of stimulation and/or to the failure or pending failure of a component of the stimulating apparatus to provide the patient with a perceivable stimulation to a second, different portion of body tissue. There is disclosed an impedance level detector for sensing the impedance presented between the outputs of the stimulation apparatus to provide a warning signal indicating that the output impedance falls outside a predetermined range. In particular, the impedance level detector output is sensed by a stimulation control logic to apply a first train of pulses at a first rate to an auxiliary electrode for stimulating the second portion of tissue. Further, there is included a voltage level detector for sensing when the power source voltage depletes below a predetermined level, to actuate the stimulation control logic to provide a second train of warning pulses to the auxiliary electrode, at a second, different rate than that of the first train. In this fashion, the patient not only is warned as to the pending failure or failure of a component of his pacemaker, but also is able to identify the failing component.
REFERENCES:
patent: 3253595 (1966-09-01), Murphy, Jr. et al.
patent: 3474353 (1969-10-01), Keller, Jr.
patent: 3523539 (1970-08-01), Lavezzo et al.
patent: 3726285 (1973-04-01), Bowers et al.
patent: 3774619 (1973-11-01), Goldberg
patent: 3783877 (1974-01-01), Bowers
patent: 3920024 (1975-11-01), Bowers
Citron Paul
Dutcher Robert G.
Jirak Thomas L.
Breimayer Joseph F.
Gable R. Lewis
Kamm William E.
Medtronic Inc.
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