Cardiac rhythm management system with time-dependent frequency response
AssigneeCardiac Pacemakers, Inc.
InventorJay A. Warren
Life of this patent
Estimating the term…
Abstract
A cardiac rhythm management system includes a time-dependent frequency response for sensed heart signals. A change in the frequency response of a sensing circuit is triggered by a sensed or evoked event to make it less sensitive to the detection of a subsequent event for a period of time. For example, a passband bandwidth is reduced, then increased during the time period triggered by the event. For even more event-triggered selectivity, a gain is reduced, then increased during the time period triggered by the event. This provides better discrimination between particular events included in a heart signal so that appropriate therapy can be delivered to the patient based such events.
Claims36
A cardiac rhythm management system, including a sensing circuit for sensing a heart signal, the sensing circuit having a frequency response that is time-dependent during a first time period initiated by one of an evoked or an intrinsic event of the heart signal.
A cardiac rhythm management system, including:
- an electronics unit including:
- a therapy circuit;
- a sensing circuit for sensing a heart signal of a heart;
- and
- a bandpass filter, included in the sensing circuit, the filter having a frequency response that is time-dependent during a first time period initiated by one of an evoked or an intrinsic event of the heart signal;
- and
- a leadwire, coupled to the electronics unit;
- and
- a programmer, remote from and communicatively coupled to the electronics unit, the programmer including a parameter controlling one of:
- (a) the frequency response of the bandpass filter, and (b) the duration of the first time period.
A method including:
- receiving, from a heart, a heart signal that includes an intrinsic event;
- filtering the heart signal to attenuate frequencies outside a frequency range having a first frequency range value;
- detecting the event;
- and
- adjusting the frequency range from the first frequency range value to a second frequency range value in response to the detection of the event.
A method including:
- receiving, from a heart, a heart signal that includes an intrinsic event;
- providing, to the heart, a stimulation for obtaining an evoked event;
- filtering the heart signal to attenuate frequencies outside a frequency range having a first frequency range value;
- detecting the intrinsic event;
- narrowing the frequency range from the first frequency range value to a second frequency range value in response to (a) the detection of the intrinsic event, and (b) the providing the stimulation;
- and
- widening the frequency range from the second frequency range value such that the frequency range approaches the first frequency range value after a first time period from (a) the detection of the intrinsic event and (b) the providing the stimulation.
Dependencies are inferred from the claim text.