Automatic cardiac capture restoration and threshold-seeking method and apparatus
First Claim
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1. A cardiac pacemaker capable of automatically seeking stimulation signal thresholds to increase power efficiency comprising:
- capture detection means for detecting capture of a heart;
amplitude seeking means coupled to said capture detection means for seeking amplitude thresholds of said stimulation signals; and
pulse width seeking means coupled to said capture detection means for seeking pulse width thresholds of said stimulation signals;
wherein said pulse width seeking means comprises means for, in response to a loss-of-capture condition detected by said capture detection means, increasing said pulse width to a maximum programmed level for a predetermined timeout period, and for seeking lower pulse width thresholds when capture is maintained after the expiration of said predetermined timeout period.
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Abstract
An automatic capture restoration and threshold-seeking method and apparatus for use with a cardiac pacemaker derives control signals for restoring cardiac capture from a cardiac pressure sensor. The pressure sensor also provides input control signals for a threshold-seeking apparatus. Both pulse width and amplitude thresholds can be changed contemporaneously during both capture restoration and threshold seeking.
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4 Claims
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1. A cardiac pacemaker capable of automatically seeking stimulation signal thresholds to increase power efficiency comprising:
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capture detection means for detecting capture of a heart; amplitude seeking means coupled to said capture detection means for seeking amplitude thresholds of said stimulation signals; and pulse width seeking means coupled to said capture detection means for seeking pulse width thresholds of said stimulation signals; wherein said pulse width seeking means comprises means for, in response to a loss-of-capture condition detected by said capture detection means, increasing said pulse width to a maximum programmed level for a predetermined timeout period, and for seeking lower pulse width thresholds when capture is maintained after the expiration of said predetermined timeout period. - View Dependent Claims (2)
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3. A cardiac pacemaker capable of automatically seeking stimulation signal thresholds to increase power efficiency comprising:
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capture detection means for detecting capture of a heart; amplitude seeking means coupled to said capture detection means for seeking amplitude thresholds of said stimulation signals; and pulse width seeking means coupled to said capture detection means for seeking pulse width thresholds of said stimulation signals; wherein said amplitude seeking means comprises means for, in response to a loss-of-capture condition detected by said capture detection means, increasing said amplitude to a maximum programmed level for a predetermined timeout period, and for seeking lower amplitude thresholds when capture is maintained after the expiration of said predetermined timeout period. - View Dependent Claims (4)
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Specification