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Implantable cardiac stimulator with automatic gain control

  • US 4,903,699 A
  • Filed: 06/07/1988
  • Issued: 02/27/1990
  • Est. Priority Date: 06/07/1988
  • Status: Expired due to Term
First Claim
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1. An implantable cardiac stimulator for detecting cardiac cycles by analyzing electrical signals produced by the heart, comprising:

  • means for detecting electrical signals produced by the heart; and

    amplifier means responsive to the detected signals and having dual signal paths for said detected signals, one of said paths having a feedback loop with means for automatically adjusting the gain of the amplifier means, the other said signal paths enables the determination of a sensing level, said means for automatically controlling the gain including an algorithm controlling gain requiring a ratio of greater than 1 to 1, said algorithm controlling gain requiring sensing of two lows in a row to increase gain and sensing one high to decrease gain whereby the gain and threshold relationships between said dual signal paths maybe altered to produce variable sensing margins.

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