Patent ID: 9643009
Date: 2017-05-09
CPC Classifications: A61N

Claim:
1. An implantable medical system, comprising: an implantable medical device; an impedance matching element coupled to an output of the implantable medical device; a comparator having a first input, a second input, and an output, said first input coupled to said impedance matching element, and wherein said comparator generates a signal from the output that is related to a voltage across said impedance matching element; a processor having a first input coupled to the output of said comparator, a first output coupled to the second input of said comparator, and having a second output; a variable impedance circuit coupled to said impedance matching element and to the second output of said processor, wherein said processor adjusts an impedance of said variable impedance circuit in response to the signal from the output of said comparator; a conductive lead having a proximal end electrically coupled to said implantable medical device and having a distal end, an impedance of a combination of the output of the implantable medical device, the impedance matching element, and the variable impedance circuit being substantially matched to a characteristic impedance of said lead by operation of the comparator, processor, and variable impedance circuit; and at least one distal therapy electrode proximate the distal end of said lead.