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AssigneeMedtronic, Inc.
InventorsMichael Todd Hemming, Bradley C. Peck, Brian A. Blow, Scott M. Morrison, Robert John Schuelke
Estimating the term…
A software programmable device means such as a microprocessor discriminates 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 incident on the lead electrodes is monitored during a short period of time immediately following a paced event. It has been discovered 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.
A sense amplifier system including electrical circuits implemented in an implantable pulse generating device to identify and process evoked response signals based on post-pace polarization signals, the sense amplifier system comprising:
A method of detecting an evoked response to delivery of a cardiac stimulating pulse to a patient's heart by an electrode capable of sensing a physiologic electrical signal and delivering stimulating pulses, the electrode being coupled to a hermetically sealed implantable medical device, the method comprising the steps of:
A medical device capable of providing intra-cardiac electrical stimuli to a patient's heart, comprising:
A method of detecting and processing an evoked response to a cardiac stimulating pulse delivered to a patient's heart by an electrode, the method comprising the steps of:
Means for detecting capture in an implantable medical device having at least one means for delivering electrical pulses and sensing a physiologic electrical signal, the capture detecting means comprising:
A medical device capable of providing intra-cardiac electrical stimuli to a patient's heart, comprising:
Dependencies are inferred from the claim text.