Cardiac pacemaker with automatic parameter adjustment
First Claim
1. A cardiac pacemaker comprisinga pulse generator for producing heart-stimulating pulses,means for electrically connecting said pulse generator to a human heart,at least one sensor for sensing a first variable parameter indicative of physiologic change,means responsive to changes in said first parameter indicative of physiologic change for initiating testing of a second variable parameter, andtesting means responsive to said means for initiating testing, said testing means comprisingmeans for stimulating the heart,means for detecting capture, andmeans for varying the magnitude of a stimulating pulse.
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Accused Products
Abstract
A cardiac pacemaker which automatically tests for changes in and adjusts output or other parameters in response to detected changes in environmental or physiologic conditions. One or more passive sensors detect environmental or physiologic conditions which may correlate to stimulation thresholds or other parameters. If a change in such conditions is detected, a test or search is initiated to achieve an energy efficient output, to optimize cardiac output, to improve sensing, etc.
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Citations
48 Claims
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1. A cardiac pacemaker comprising
a pulse generator for producing heart-stimulating pulses, means for electrically connecting said pulse generator to a human heart, at least one sensor for sensing a first variable parameter indicative of physiologic change, means responsive to changes in said first parameter indicative of physiologic change for initiating testing of a second variable parameter, and testing means responsive to said means for initiating testing, said testing means comprising means for stimulating the heart, means for detecting capture, and means for varying the magnitude of a stimulating pulse.
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13. A cardiac pacemaker comprising
a pulse generator for producing heart-stimulating pulses, means for electrically connecting said pulse generator to a human heart, at least one sensor for sensing a first variable parameter indicative of physiologic change, means responsive to changes in said first parameter indicative of physiologic change for initiating testing of a second variable parameter, and testing means responsive to said means for initiating testing, said testing means comprising means for stimulating the heart, means for detecting a T-wave, and means for altering the duration of a refractory period.
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25. A cardiac pacemaker comprising
a pulse generator for producing heart-stimulating pulses, means for electrically connecting said pulse generator to a human heart, at least one sensor for sensing a first variable parameter indicative of physiologic change, means responsive to changes in said first parameter indicative of physiologic change for initiating testing of a second variable parameter, and testing means responsive to said means for initiating testing, said testing means comprising means for measuring the stroke volume, and means for varying magnitude of an A-V delay of a stimulating pulse.
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37. A cardiac pacemaker comprising
a pulse generator for producing heart-stimulating pulses, means for electrically connecting said pulse generator to a human heart, at least one sensor for sensing a first variable parameter indicative of physiologic change, means responsive to changes in said first parameter indicative of physiologic change for initiating testing of a second variable parameter, and testing means responsive to said means for initiating testing, said testing means comprising means for detecting intrinsic cardiac signals, and means for altering amplification gain.
Specification