A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.2
A61N 1/36 (2006.01) A61N 1/37 (2006.01) A61N 1/08 (2006.01)
Patent
CA 1101934
ABSTRACT OF THE DISCLOSURE Apparatus for stimulating body tissue is disclosed as including a circuit responsive to the initiation of stimulation, 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. An impedance level detector senses the impedance between the outputs of the stimulation apparatus to provide a warning signal indicating that the output impedance falls outside a predetermined range. 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. A voltage level detector senses 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. The patient is warned as to the pending failure or failure of a component of his pacemaker and is able to identify the failing component. Also provided is decoder logic comprising a switch actuatable by a magnet that may be manipu- lated exterior of the patient's body to turn off the warning stimulation and/or to reset or reinitialize the operation of the stimulation control logic, so that the stimulation control logic is conditioned to receive further warning signals from either the voltage level detector and/or the impedance level de- tector.
290039
Citron Paul
Dutcher Robert G.
Jirak Thomas L.
Medtronic Inc.
Smart & Biggar
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