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Lead electrode for use in an MRI-safe implantable medical device

  • US 8,989,840 B2
  • Filed: 03/02/2005
  • Issued: 03/24/2015
  • Est. Priority Date: 03/30/2004
  • Status: Active Grant
First Claim
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1. An implantable medical system, comprising:

  • an implantable medical device having a stimulator output point;

    an impedance adjusting circuit comprising at least a matching resistor electrically coupled to the stimulator output point;

    a conductive lead having a proximal end electrically coupled at least to said matching resistor and having a distal end, the impedance adjusting circuit having an impedance that causes the impedance looking into said stimulator output point to be substantially matched to the characteristic impedance of said lead so that a voltage present across the matching resistor is at a maximum; and

    at least one distal therapy electrode proximate the distal end of said lead.

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