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Telemetry system for implantable pacer

  • US 4,757,816 A
  • Filed: 01/30/1987
  • Issued: 07/19/1988
  • Est. Priority Date: 01/30/1987
  • Status: Expired due to Term
First Claim
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1. A system for transmitting digital data from an implanted cardiac pacer to an external programming/receiver unit comprising:

  • input means responsive to analog internal signals from an implanted pacer for generating amplified analog signals; and

    variable period pulse generator means responsive to the magnitude of said amplified analog signals for generating output pulse signals in which the pulse-to-pulse time interval is variable and is directly proportional to the magnitude of said amplified analog signals and the signal information is contained within the pulse-to-pulse interval whereby the width of the pulses may be minimal;

    said pulse generator means comprising an input capacitor, an output capacitor, a field effect transistor having its gate coupled to the output capacitor, means forming a voltage divider network from said capacitors with the output frequency of the pulse generator means being directly proportional to the analog signals across the output capacitor.

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