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System and method for receiving telemetry data from an implantable medical device

  • US 7,203,545 B2
  • Filed: 04/21/2003
  • Issued: 04/10/2007
  • Est. Priority Date: 01/04/2001
  • Status: Expired due to Term
First Claim
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1. A programmer for a cardiac rhythm management device, the programmer comprising:

  • an antenna adapted to receive a signal transmitted from the cardiac rhythm management device, the signal being a carrier waveform modulated with transmit pulses;

    an analog-to-digital converter, coupled to the antenna, adapted to digitize the received signal;

    one or more notch filters, coupled to the analog-to-digital converter, adapted to remove narrowband noise from the received signal;

    a matched filter coupled to the one or more notch filters, the matched filter adapted to produce an output signal corresponding to a cross-correlation between the received signal and a transmit pulse expected to be generated by the cardiac rhythm management device; and

    a pulse detector, coupled to the matched filter, adapted to detect the transmit pulses by comparing the output signal of the matched filter with a threshold value.

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