Implantable cardiac stimulation device having automatic sensitivity control and method
AssigneePacesetter, Inc.
InventorsGabriel A. Mouchawar, James D. Causey III, Kelly H. McClure, J. Christopher Moulder, Paul A. Levine
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Abstract
An implantable cardiac stimulation device and method provides reliable sensing of cardiac events to support cardiac pacing or fibrillation detection. The device comprises a sensing circuit that senses the cardiac events in accordance with a plurality of threshold characterizing parameters. A parameter control adjusts the threshold parameters responsive to the rate of the sensed cardiac events in a manner which precludes positive feedback to prevent continued oversensing, undersensing, or noise sensing.
Claims53
An implantable cardiac stimulation device comprising:
- a sensing circuit that senses cardiac activity of a heart under control of a plurality of sensing parameters;
- a pulse generator that applies electrical energy to the heart;
- and
- a processor that is connected to the sensing circuit and that is operative to adjust at least one of the sensing parameters based on an amplitude value and rate of sensed cardiac events of the sensed cardiac activity.
An implantable cardiac stimulation device comprising:
- sensing means for sensing cardiac activity of a heart in accordance with a plurality of sensing parameters;
- and
- control means for adjusting at least one of the sensing parameters based on an amplitude and rate of sensed cardiac events of the sensed cardiac activity.
In an implantable cardiac stimulation device, a method of adjusting sensing parameters used in sensing cardiac events of a heart, the method comprising:
- sensing cardiac events of the heart using a set of sensing parameters;
- determining an amplitude value and rate of the sensed cardiac events;
- and
- adjusting the sensing parameters based upon the amplitude value and rate of the sensed cardiac events.
A sensing system that senses cardiac events for use in an implantable cardiac stimulation device, the system comprising:
- a sensing circuit that senses cardiac events of a heart using a plurality of sensing parameters;
- and
- a processor that adjusts at least one of the sensing parameters in response to an amplitude value and rate of the sensed cardiac events.
Dependencies are inferred from the claim text.