A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.2
A61N 1/36 (2006.01) A61N 1/08 (2006.01) A61N 1/365 (2006.01)
Patent
CA 1056017
Abstract of the Disclosure A cautery protection circuit is disclosed for use with a heart pacemaker or generator circuit and comprises circuit elements for preventing those signals induced within the output portion of the heart pacemaker circuit by an electric field established by cautery procedures, from damaging the generator circuit or turning on the generator circuit at an undesired instant in time, whereby, otherwise, a pacemaker pulse signal may be generated to possibly induce fibrillation within the patient's heart. The cautery protection circuit of this invention is particularly adapted for use with a bipolar heart pacemaker and in particular includes a toroidal inductor having first and second inductors coupled to each of the output leads and having a high permativity coupling there- between, whereby when cautery signals are induced in the output leads associated with the patient's heart, the coupled inductors operate in a "common mode" configuration to, in effect, "multiply" or increase the inductance presented thereby to the induced signals, thus significantly limiting the current passed therethrough. The coupled inductors of the toroidal inductor also operate in a "differential mode" wherein a pacemaker pulse as generated by the pacemaker generator circuit is applied thereto in a manner such that the fields induced in the coupling between the first and second inductors is opposing, whereby the inductors provide a low or substantially "0" inductance to the pacemaker pulse and thus, impose substantially no shaping upon the output pulses.
243855
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