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Filtering of a physiologic signal in a medical device

  • US 8,047,999 B2
  • Filed: 10/31/2008
  • Issued: 11/01/2011
  • Est. Priority Date: 09/19/2008
  • Status: Active Grant
First Claim
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1. A system for filtering a pressure signal in a medical device, comprising:

  • a sensor terminal sensing the pressure signal;

    an electrode terminal receiving cardiac electrical signals;

    a microprocessor that determines a heart rate based on the received cardiac electrical signals; and

    a signal filtering system that digitizes the sensed pressure signal and that filters the digitized pressure signal using a filter having a heart-rate dependent frequency response, wherein the filter comprises;

    a first filter portion having a first frequency response corresponding to a heart rate that is greater than a heart rate threshold; and

    a second filter portion having a second frequency response different from the first frequency response, the second frequency response corresponding to a heart rate that is less than the heart-rate threshold, andwherein the microprocessor derives a respiration signal based on the filtered pressure signal, and determines a respiration parameter based on the derived respiration signal.

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