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Transthoracic protection circuit for implantable medical devices

  • US 9,539,435 B2
  • Filed: 04/24/2015
  • Issued: 01/10/2017
  • Est. Priority Date: 09/08/2014
  • Status: Active Grant
First Claim
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1. An implantable medical device for delivery of electrical stimulation therapy to a patient, comprising:

  • a first tissue interface electrode configured for delivery of the therapy to the patient;

    a second tissue interface electrode configured for delivery of the therapy to the patient; and

    a low power therapy delivery circuit, including;

    a first electrode terminal coupled to the first tissue interface electrode;

    a second electrode terminal coupled to the second tissue interface electrode;

    a transthoracic protection circuit portion having;

    a first segment coupled to the first electrode terminal and a second segment coupled to the second electrode terminal;

    an unprotected circuit portion of the low power therapy delivery circuit being coupled to the transthoracic protection circuit portion; and

    a reference potential corresponding to a ground potential, wherein the first and second segments of the transthoracic protection circuit portion are coupled to the reference potential in a parallel configuration, and wherein a first impedance of the first segment approximates a second impedance of the second segment.

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