Implantable cardiac stimulator with physiologic sensor based on mechanical-electric phase relation
First Claim
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1. A method of controlling the pacing rate of a cardiac pacemaker comprising the steps of:
- a. receiving a sensor signal waveform from a sensor lead of a pacemaker,b. deriving data from the sensor signal waveform, the derived data descriptive of the sensor signal waveform over at least most of a cardiac cycle,c. developing a first order parameter of the sensor signal waveform which defines that cardiac cycle, andd. providing the first order parameter to a microprocessor for control of a pacing signal of the cardiac pacemaker.
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Abstract
A cardiac pacemaker includes circuitry which receives a raw impedance signal from the sensor leads of the pacemaker, derives data from the impedance signal that is descriptive of the impedance signal over an entire (or a large part of the) cardiac cycle, develops first order parameters which define that cycle, and provides these parameters to a microprocessor for control of the pacing signal. These parameters may also be used to determine other information about the functioning of the pacemaker. The present invention may also be applied to the determination of tachycardia of an intrinsically paced heart, as well as other applications.
112 Citations
27 Claims
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1. A method of controlling the pacing rate of a cardiac pacemaker comprising the steps of:
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a. receiving a sensor signal waveform from a sensor lead of a pacemaker, b. deriving data from the sensor signal waveform, the derived data descriptive of the sensor signal waveform over at least most of a cardiac cycle, c. developing a first order parameter of the sensor signal waveform which defines that cardiac cycle, and d. providing the first order parameter to a microprocessor for control of a pacing signal of the cardiac pacemaker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for controlling the pacing rate of a cardiac pacemaker comprising:
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a. means for receiving a sensor signal waveform from a sensor lead of a pacemaker, b. means for deriving data from the sensor signal waveform, the derived data descriptive of the sensor signal waveform over at least most of a cardiac cycle, c. means for developing a first order parameter of the sensor signal waveform which defines that cardiac cycle, and d. means for providing the first order parameter to a microprocessor for control of a pacing signal of the cardiac pacemaker. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A cardiac stimulation apparatus comprising:
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a. a stimulus generator for stimulating a patient'"'"'s heart; b. a sensor adapted to be coupled to the patient'"'"'s heart for sensing a time varying physiologic characteristic of the heart, c. a signal injector for impressing a signal, on the heart which develops the signal detected by the sensor; d. an extractor coupled to the signal injector, the extractor generating a first order parameter of the time varying characteristic of the heart based upon at least most of a cardiac cycle, and e. a microprocessor to receive the first order parameter and activate a pacing pulse from the stimulus generator based on the first order parameter.
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19. A method of controlling the pacing rate of a cardiac pacemaker comprising the steps of:
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a. sensing an impedance of a region of a heart with a sensor lead of a pacemaker, resulting in an impedance signal, b. sampling the impedance signal, resulting in a digitized impedance signal, c. blanking and padding the digitized impedance signal, resulting in a filtered impedance signal, d. synchronous averaging the filtered impedance signal, resulting in a synchronous averaged impedance signal, e. extracting a first order parameter from the synchronous averaged impedance signal, f. providing the first order parameter to a microprocessor for control of a pacing signal of the cardiac pacemaker. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method of controlling the pacing rate of a cardiac pacemaker comprising the steps of:
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a. sensing an impedance of a region of a heart with a sensor lead of a pacemaker, resulting in an impedance signal, b. sampling the impedance signal, resulting in a digitized impedance signal, c. blanking and padding the digitized impedance signal, resulting in a filtered impedance signal, d. synchronous averaging the filtered impedance signal, resulting in a synchronous averaged impedance signal, e. extracting a harmonic of a first order parameter from the synchronous averaged impedance signal, f. providing the harmonic of the first order parameter to a microprocessor for control of a pacing signal of the cardiac pacemaker.
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Specification