Biphasic cardiac pacer
First Claim
1. A method of detecting evoked response from the heart, comprising the steps of:
- providing a rectangular stimulating pulse;
determining the charge of the stimulation pulse;
thereafter generating a rectangular compensating pulse having an opposite polarity to the stimulating pulse and having an absolute amplitude that is less than the absolute amplitude of the stimulating pulse and having a duration that is continued during the generation of the compensating pulse until the charge of the compensating pulse is equal to the charge of the stimulating pulse; and
thereafter detecting the evoked response using the same electrodes that are used for providing the stimulating and compensating pulses.
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Accused Products
Abstract
A biphasic cardiac pacer is provided having a novel system for detecting the evoked response from the heart after a stimulating pulse is applied. A relatively short, high absolute amplitude stimulating pulse is applied to the heart. Thereafter, a compensating pulse having an absolute amplitude that is smaller than the absolute amplitude of the stimulating pulse, and having a duration that is longer than the duration of the stimulating pulse, is provided. The stimulating pulse and compensating pulse together comprise a biphasic waveform that provides rapid electrode charge neutralization and enhances subsequent capture detection. The biphasic waveform is automatically and dynamically balanced so that the electrical charge of the stimulating pulse portion is equal to the electrical charge of the compensating pulse portion. After the compensating pulse is provided, the evoked response is detected using the same electrodes that are used for providing the stimulating and compensating pulses.
168 Citations
13 Claims
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1. A method of detecting evoked response from the heart, comprising the steps of:
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providing a rectangular stimulating pulse; determining the charge of the stimulation pulse; thereafter generating a rectangular compensating pulse having an opposite polarity to the stimulating pulse and having an absolute amplitude that is less than the absolute amplitude of the stimulating pulse and having a duration that is continued during the generation of the compensating pulse until the charge of the compensating pulse is equal to the charge of the stimulating pulse; and thereafter detecting the evoked response using the same electrodes that are used for providing the stimulating and compensating pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cardiac pacer in which stimulating pulses may be provided to a chamber of the heart via a stimulating electrode connected to the heart, which comprises:
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means for providing a rectangular stimulating pulse to said electrode; means for determining the charge of the stimulation pulse; means for thereafter generating a rectangular compensating pulse to said electrode, said compensating pulse having an opposite polarity to the stimulating pulse and having an absolute amplitude that is less than the absolute amplitude of the stimulating pulse and having a duration that is continued during the generation of the compensating pulse until the charge of the compensating pulse is equal to the charge of the stimulating pulse; and means for thereafter detecting the evoked response using the same electrodes that are used for providing the stimulating and compensating pulses. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification