Method and apparatus for automatic capture verification using polarity discrimination of evoked response
AssigneePacesetter, Inc.
InventorKerry Bradley
Life of this patent
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Abstract
A cardiac stimulation device and method automatically confirm capture by detecting the polarity of a post-stimulation signal. A capture detection circuit is subjected to recharge and block overlap signals applied such than an evoked response signal is characterized by a primarily positive polarity and a polarization signal is characterized by a primarily negative polarity. An amplitude detection feature, such as peak amplitude or signal integral, and its polarity are determined from a post-stimulation signal sensed by the capture detection circuit during a capture detection window. Capture is confirmed when the amplitude detection feature has a positive polarity.
Claims37
A method of automatically verifying capture for use in a cardiac stimulation device, the method comprising:
- delivering a stimulation pulse;
- setting a capture detection window;
- detecting a post-stimulation cardiac signal sensed during the capture detection window;
- identifying a polarity of an amplitude of the post-stimulation cardiac signal;
- confirming capture if the amplitude has a predetermined polarity;
- and
- confirming loss of capture if the amplitude has a different polarity than the predetermined polarity.
A cardiac stimulation device capable of automatically verifying capture, comprising:
- a pulse generator that selectively generates a stimulation pulse for delivery to one or more cardiac chambers;
- a timing circuit, connected to the pulse generator, that sets a capture detection window;
- a sensor that senses post-stimulation cardiac signals during the detection windows;
- a detector that identifies a polarity of an amplitude of the post-stimulation cardiac signals;
- and
- a control circuit that confirms capture if the amplitude has a predetermined polarity, and that confirms loss of capture if the amplitude has a different polarity than the predetermined polarity.
A cardiac stimulation device capable of automatically verifying capture, comprising:
- means for selectively delivering a stimulation pulse to one or more cardiac chambers;
- means for sensing a post-stimulation cardiac signal following delivery of a stimulation pulse;
- means for identifying a polarity of an amplitude of the post-stimulation cardiac signals;
- and
- means for confirming capture if the amplitude has a predetermined polarity, and that confirms loss of capture if the amplitude has a different polarity than the predetermined polarity.
Dependencies are inferred from the claim text.