Cardiac pacemaker with capture verification
First Claim
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1. An implantable cardiac pacemaker comprising:
- means for generating electrical stimuli to be selectively delivered to a patient'"'"'s heart; and
means for sensing electrical activity of said heart, said sensing means includingat least one amplifier, andmeans for selectively changing the bandpass frequency characteristics of said amplifier during a cardiac cycle to a first predetermined low frequency range for a first period of time after delivery of a stimulus to said heart to detect evoked electrical activity in the heart and to a second predetermined high frequency range for a second period of time to detect intrinsic electrical activity in the heart.
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Abstract
A pacemaker having an electrical stimulation source of known type is provided with a sense amplifier having a switched capacitor circuit which allows switching of the amplifier'"'"'s bandpass frequency characteristic thereby selectively varying the cardiac signal frequencies subject to sensing. The heart'"'"'s electrical activity is detected in a first predetermined low frequency range after to delivery of a stimuli to detect evoked electrical activity and a second predetermined high frequency range to detect intrinsic electrical activity. The magnitude of stimuli is varied response to the detected presence or absence of evoked electrical activity.
91 Citations
32 Claims
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1. An implantable cardiac pacemaker comprising:
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means for generating electrical stimuli to be selectively delivered to a patient'"'"'s heart; and means for sensing electrical activity of said heart, said sensing means including at least one amplifier, and means for selectively changing the bandpass frequency characteristics of said amplifier during a cardiac cycle to a first predetermined low frequency range for a first period of time after delivery of a stimulus to said heart to detect evoked electrical activity in the heart and to a second predetermined high frequency range for a second period of time to detect intrinsic electrical activity in the heart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for adjusting an implantable cardiac pacemaker comprising:
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generating electrical stimuli to be selectively delivered to a patient'"'"'s heart, sensing electrical activity of said heart, amplifying sensed electrical activity, changing bandpass frequency characteristics during a cardiac cycle to a first predetermined low frequency range for a first period of time after delivery of a stimulus to said heart, detecting evoked electrical activity in the heart, and changing bandpass frequency characteristics during said cardiac cycle to a second predetermined high frequency range for a second period of time to detect intrinsic electrical activity in the heart. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification