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1. (WO1998048893) MICROPROCESSOR CAPTURE DETECTION CIRCUIT AND METHOD

Pub. No.:    WO/1998/048893    International Application No.:    PCT/US1998/008322
Publication Date: Fri Nov 06 00:59:59 CET 1998 International Filing Date: Sat Apr 25 01:59:59 CEST 1998
IPC: A61N 1/37
Applicants: MEDTRONIC, INC.
Inventors: HEMMING, Michael, T.
PECK, Bradley, C.
BLOW, Brian, A.
MORRISON, Scott, M.
SCHUELKE, Robert, J.
Title: MICROPROCESSOR CAPTURE DETECTION CIRCUIT AND METHOD
Abstract:
The present invention employs software programmable device means such as a microprocessor to discriminate between evoked response signals and post-pace polarization signals sensed by an implantable medical device. The polarity of the positive or negative change in voltage in respect of time (or dv/dt) of the waveform incidient on the lead electrodes is monitored during a short period of time immediately following a paced event. It has been discorvered that the post-pace polarization signal exhibits a relatively constant polarity during the capture detect window, and that the evoked response signal may cause the polarity of post-pace polarization signal to reverse during the capture detect window. The sign of the post-pace polarization polarity, either positive or negative, is determined by the design of the specific output circuitry. The evoked response signal may reverse the polarity of the sensed signal in either case, from positive to negative or from negative to positive, during the time window of interest. In another embodiment of the present invention, and when the magnitude of the post-pace polarization is so great that the evoked response does not reverse the polarity of the waveform, discrimination of the evoked response is achieved by noting an acceleration (or increasing magnitude of dv/dt) in the sensed signal or waveform.