A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
A61N 1/36 (2006.01) A61N 1/368 (2006.01) A61N 1/372 (2006.01)
Patent
CA 2136588
An implantable pulse generator responsive to closure of a remotely actuable switch to operate in one or more triggered magnet modes, wherein intrinsic cardiac activity is continuously sensed. The pulse generator includes a timing mechanism for defining a predetermined triggered magnet mode interval. During triggered magnet mode operation, the pulse generator delivers pacing pulses at the end of each triggered magnet mode interval, provided that no intrinsic cardiac activity is sensed during the interval. Each time a stimulating pulse is delivered, the timing mechanism is reset and restarted to initiate another triggered magnet mode interval. The pulse generator is responsive to the sensing of intrinsic cardiac activity prior to expiration of a triggered magnet mode interval to deliver a non-competitive triggered stimulating pulse and to reset and restart the timing mechanism. In this way, competitive pacing and pacing during the vulnerable phase of a cardiac cycle is avoided. Upon discontinuance of switch closure, the pulse generator resumes operation in its previously programmed mode. Operation of the pulse generator inthe triggered magnet mode does not interfere with other functions, such as threshold margin testing, battery depletion measurement, pace and sense threshold measurement, device interrogation and programming, and the like, normally associated with and performed during conventional magnet mode operation.
Struble Chester
Medtronic Inc.
Smart & Biggar
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