System and method for receiving telemetry data from an implantable medical device
First Claim
Patent Images
1. A system for receiving data from an implantable medical device, the system comprising:
- means for measuring a transmit pulse from the implantable medical device and storing signal samples of the measured transmit pulse in reverse order to generate a time-reversed version of the measured transmit pulse;
means for receiving a subsequent signal transmitted from the implantable medical device, the received subsequent signal being a carrier waveform modulated with transmit pulses, wherein a bandwidth of the modulated carrier of the received transmit pulse includes a range of multiple frequencies;
means for producing a correlation signal by convolution, using the time domain, of the received subsequent signal from the implantable medical device and the time-reversed version of the measured transmit pulse; and
means for detecting the transmit pulses by comparing the correlation signal with a threshold value.
0 Assignments
0 Petitions
Accused Products
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.
30 Citations
20 Claims
-
1. A system for receiving data from an implantable medical device, the system comprising:
-
means for measuring a transmit pulse from the implantable medical device and storing signal samples of the measured transmit pulse in reverse order to generate a time-reversed version of the measured transmit pulse; means for receiving a subsequent signal transmitted from the implantable medical device, the received subsequent signal being a carrier waveform modulated with transmit pulses, wherein a bandwidth of the modulated carrier of the received transmit pulse includes a range of multiple frequencies; means for producing a correlation signal by convolution, using the time domain, of the received subsequent signal from the implantable medical device and the time-reversed version of the measured transmit pulse; and means for detecting the transmit pulses by comparing the correlation signal with a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for receiving data from an implantable medical device, the method comprising:
-
measuring a transmit pulse from the implanted medical device; storing signal samples of the measured transmit pulse in reverse order to generate a time-reversed version of the measured transmit pulse; receiving a subsequent signal from the implantable medical device, the subsequent signal being a carrier waveform modulated with transmit pulses, wherein a bandwidth of the modulated carrier of the received transmit pulse includes a range of multiple frequencies; producing a correlation signal by convolution, using the time domain, of the received subsequent signal and the time-reversed version of the measured transmit pulse; and detecting the transmit pulses by comparing the correlation signal with a threshold value. - View Dependent Claims (17, 18, 19, 20)
-
Specification