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Implantable medical device with chemical sensor and related methods

  • US 7,809,441 B2
  • Filed: 05/17/2006
  • Issued: 10/05/2010
  • Est. Priority Date: 05/17/2006
  • Status: Expired due to Fees
First Claim
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1. An implantable medical device comprising:

  • a cardiac rhythm management system comprisingan implantable pulse generator comprisinga power source,circuitry for delivering at least one of cardiac pacing and cardiac shock therapy; and

    an implantable housing configured to encapsulate the circuitry for delivering at least one of cardiac pacing and cardiac shock therapy; and

    a chronically implantable chemical sensor in communication with the pulse generator, the chemical sensor configured to detect an ion concentration in a bodily fluid, the chemical sensor comprising;

    an optical sensing element selective for potassium ion comprising a polymeric matrix permeable to sodium ions, potassium ions, and hydronium ions;

    an optical excitation assembly configured to illuminate the optical sensing element;

    an optical detection assembly configured to receive light from the optical sensing element, andan opaque cover layer disposed over a side of the sensing element.

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