System and method for receiving telemetry data from an implantable medical device
First Claim
Patent Images
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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Abstract
A system and method for receiving telemetry data from implantable medical devices such as cardiac pacemakers with improved noise immunity is disclosed. Ambient noise levels and signal strength are monitored and used to adaptively adjust the detection sensitivity of the receiver. Filtering of the received signal is performed to remove both broadband and narrowband noise. Removal of narrowband noise is accomplished with notch filters that are dynamically adjusted in accordance with a detected noise spectrum.
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Citations
12 Claims
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1. A programmer for a cardiac rhythm management device, the programmer comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification