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US 6,556,871 B2Granted
System and method for receiving telemetry data from an implantable medical device
AssigneeCardiac Pacemakers, Inc.
InventorsSteven Schmitt, Fred Schleifer, Joseph E. Bange
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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.
Claims25
A system for receiving data from an implantable medical device, comprising:
- an antenna for receiving an input signal which includes a transmitted signal containing transmit pulses from the implantable device;
- a matched filter for filtering the input signal and producing an output signal which corresponds to a cross-correlation between the input signal and a transmit pulse expected to be generated by the implantable device;
- a noise peak detector for measuring a peak noise value in the input signal;
- a transmitted signal peak detector for measuring a peak transmitted signal value in the input signal;
- circuitry for adjusting a pulse threshold value which computes the pulse threshold value as a value between the measured peak noise value and the measured transmitted signal peak value;
- and,
- a pulse detector for detecting transmit pulses within the input signal by comparing the output signal of the matched filter with the pulse threshold value.
4 more elements
Dependencies are inferred from the claim text.