CONTROL OF EXTERNALLY INDUCED CURRENT IN AN IMPLANTABLE PULSE GENERATOR

摘要

The present invention takes teh form of a current limiting apparatus and method for limiting current flow, induced whin thelevel of an external signal is greater than an external signal threshold signal level, in a conductive loop formed by a medical device implanted within living orgaism having electrically excitable tissue. The system includes an implantable pulse generator (IPG) system having a housing, sa signal generator disposed int he housing that generates an electrical signal, and at least one lead extending from the housing to convey electrical signal to the patient. To limit the induced current flow, the IPG includes current limiting componentry, an imedance increasing element, and/or alternating curretn blocking elements. These components provide an alternating current impedance path to the electrical ground from a lead coupled to the capacitive element. Also disclosed are techniques for reducing the effective surface area of the current inducing loop caused bz the IPG system.