Rate-responsive pacemaker with minute volume determination and EMI protection
First Claim
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1. A rate responsive pacemaker comprising:
- a sensor for sensing cardiac activity and generating a corresponding cardiac sense signal;
a pace generator for generating pacing signals in response to a first and a second command signal;
a metabolic demand sensor for sensing a metabolic demand parameter and generating a corresponding metabolic indicated signal;
a noise sensor for generating a noise signal when sensing noise; and
a controller receiving said sensor, metabolic indicated and noise signals and generating said first command responsive to said metabolic indicated signal in absence of noise and said second command independent of said metabolic indicated signal in the presence of noise.
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Abstract
A rate responsive pacemaker includes a noise sensor for sensing noise on the leads. If noise is detected, the pacemaker switches to a mode wherein a metabolic demand parameter is ignored. The noise is preferably detected by using test signals which are also used to measure the metabolic demand parameter.
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Citations
14 Claims
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1. A rate responsive pacemaker comprising:
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a sensor for sensing cardiac activity and generating a corresponding cardiac sense signal; a pace generator for generating pacing signals in response to a first and a second command signal; a metabolic demand sensor for sensing a metabolic demand parameter and generating a corresponding metabolic indicated signal; a noise sensor for generating a noise signal when sensing noise; and a controller receiving said sensor, metabolic indicated and noise signals and generating said first command responsive to said metabolic indicated signal in absence of noise and said second command independent of said metabolic indicated signal in the presence of noise. - View Dependent Claims (2, 3, 4, 5)
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6. A rate response pacemaker comprising:
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a lead extending to a cardiac chamber; a sensor for sensing cardiac activity from said lead and generating a corresponding cardiac sense signal; a pace generator for generating pacing signals in response to a first and a second command signal; a metabolic demand sensor for sensing a metabolic demand parameter and generating a corresponding metabolic indicated signal; a noise sensor for generating a noise signal when sensing noise on said lead; and a controller receiving said sensor, metabolic indicated and noise signals and generating said first command responsive to said metabolic indicated signal in absence of noise and said second command independent of said metabolic indicated signal in the presence of noise. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A pacemaker comprising:
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a sensor for sensing intrinsic activity in a patient'"'"'s heart and generating in response sensed signals; a pace generator for generating pacing pulses in response to commands; a controller receiving said sensed signals and generating in response said commands; and a noise sensor sensing external noise and in response altering the operation of said controller, said noise sensor including a test generator for generating two test pulses of equal magnitude and a test sensor for comparing the responses to said test pulses, said response being indicative of said external noise.
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14. A pacemaker comprising:
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a sensor for sensing intrinsic activity in a patient'"'"'s heart and generating in response sensed signals; a pace generator for generating pacing pulses in response to commands; a controller receiving said sensed signals and generating in response said commands; and a noise sensor sensing external noise and in response altering the operation of said controller, said noise sensor including a test generator for generating a multiphase test pulse, said multiphase test pulse including at least two test portions of equal magnitude but different phases.
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Specification