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Cardiac pacer having active notch filter system

  • US 4,436,093 A
  • Filed: 09/28/1982
  • Issued: 03/13/1984
  • Est. Priority Date: 11/04/1980
  • Status: Expired due to Fees
First Claim
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1. In a cardiac pacer of the type responsive to an applied cardiac sense signal which includes a desired signal component and a power line-induced interference component, a sense amplifier comprising:

  • means comprising a plurality of selectable sample-and-hold channels for independently sampling the instantaneous amplitude of said cardiac signal;

    sampling means for sequentially and repeatedly selecting said channels whereby each channel is selected for an equal period of time over a complete selecting cycle; and

    signal summation means for combining the outputs of said channels to derive an output signal including said desired signal component;

    said channels being selected at a frequency of nf, where n is a whole integer and f is the frequency of the power line component, whereby said interference component is attenuated from said output signal.

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