Extra-cardiovascular cardiac pacing system
First Claim
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1. An extra-cardiovascular medical device, comprising:
- an impedance measurement module configured to measure an impedance of an extra-cardiovascular pacing electrode vector when extra-cardiovascular pacing electrodes are electrically coupled to the medical device;
a therapy delivery module comprising a capacitor array having a plurality of capacitors for producing a pacing pulse; and
a pacing control module coupled to the therapy delivery module and the impedance measurement module and configured to;
control the impedance measurement module to measure the impedance of the extra-cardiovascular pacing electrode vector;
determine a first capacitor configuration based on the measured impedance by determining a capacitance required for the measured impedance to produce an RC time constant that is greater than a time interval threshold and identifying the first capacitor configuration so that the first capacitance is equal to or greater than the determined capacitance, the first capacitor configuration comprising a first combination of the plurality of capacitors having a first capacitance;
control the therapy delivery module to select the first capacitor configuration by selectively enabling the first combination of the plurality of capacitors of the capacitor array; and
control the therapy delivery module to deliver a cardiac pacing pulse by discharging the first capacitor configuration for a predetermined pulse width across the extra-cardiovascular pacing electrode vector.
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Abstract
An extra-cardiovascular medical device is configured to select a capacitor configuration from a capacitor array and deliver a low voltage, pacing pulse by discharging the selected capacitor configuration across an extra-cardiovascular pacing electrode vector. In some examples, the medical device is configured to determine the capacitor configuration based on a measured impedance of the extra-cardiovascular pacing electrode vector.
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Citations
20 Claims
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1. An extra-cardiovascular medical device, comprising:
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an impedance measurement module configured to measure an impedance of an extra-cardiovascular pacing electrode vector when extra-cardiovascular pacing electrodes are electrically coupled to the medical device; a therapy delivery module comprising a capacitor array having a plurality of capacitors for producing a pacing pulse; and a pacing control module coupled to the therapy delivery module and the impedance measurement module and configured to; control the impedance measurement module to measure the impedance of the extra-cardiovascular pacing electrode vector; determine a first capacitor configuration based on the measured impedance by determining a capacitance required for the measured impedance to produce an RC time constant that is greater than a time interval threshold and identifying the first capacitor configuration so that the first capacitance is equal to or greater than the determined capacitance, the first capacitor configuration comprising a first combination of the plurality of capacitors having a first capacitance; control the therapy delivery module to select the first capacitor configuration by selectively enabling the first combination of the plurality of capacitors of the capacitor array; and control the therapy delivery module to deliver a cardiac pacing pulse by discharging the first capacitor configuration for a predetermined pulse width across the extra-cardiovascular pacing electrode vector. - View Dependent Claims (2, 3, 4, 5)
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6. An extra-cardiovascular medical device comprising:
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an impedance measurement module configured to measure an impedance of an extra-cardiovascular pacing electrode vector when extra-cardiovascular pacing electrodes are electrically coupled to the medical device; a therapy delivery module comprising a capacitor array having a plurality of capacitors for producing a pacing pulse; and a pacing control module coupled to the therapy delivery module and the impedance measurement module and configured to; control the impedance measurement module to measure the impedance of the extra-cardiovascular pacing electrode vector; determine a first capacitor configuration based on the measured impedance, the first capacitor configuration comprising a first combination of the plurality of capacitors having a first capacitance; control the therapy delivery module to select the first capacitor configuration by selectively enabling the first combination of the plurality of capacitors of the capacitor array; and control the therapy delivery module to deliver a cardiac pacing pulse by discharging the first capacitor configuration for a predetermined pulse width across the extra-cardiovascular pacing electrode vector, wherein the therapy delivery module is configured to sample the amplitude of the pacing pulse after a first portion of the pulse width; and the pacing control module is further configured to; receive the sampled pacing pulse amplitude from the therapy delivery module; compare the sampled pacing pulse amplitude to a first amplitude threshold; determine a second capacitor configuration in response to the sampled pacing pulse amplitude being less than or equal to the first amplitude threshold; control the therapy delivery module to select the second capacitor configuration by selectively enabling the second combination of the plurality of capacitors of the capacitor array; and control the therapy delivery module to continue delivering the pacing pulse by discharging the second capacitor configuration during a second portion of the pulse width, the second portion after the first portion. - View Dependent Claims (7, 8, 9, 10)
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11. A method performed by an extra-cardiovascular medical device, comprising:
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measuring an impedance of an extra-cardiovascular pacing electrode vector when extra-cardiovascular pacing electrodes are electrically coupled to the medical device; determining by a pacing control module of the medical device a first capacitor configuration based on the measured impedance by determining a capacitance required for the measured impedance to produce an RC time constant that is greater than a time interval threshold and identifying the first capacitor configuration so that the first capacitance is equal to or greater than the determined capacitance, the first capacitor configuration comprising a first combination of a plurality of capacitors of a capacitor array; selecting the first capacitor configuration by selectively enabling the first combination of the plurality of capacitors; and delivering a cardiac pacing pulse by discharging the first capacitor configuration for a predetermined pulse width across the extra-cardiovascular pacing electrode vector. - View Dependent Claims (12, 13, 14, 15)
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16. A method comprising:
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measuring an impedance of an extra-cardiovascular pacing electrode vector when extra-cardiovascular pacing electrodes are electrically coupled to the medical device; determining by a pacing control module of the medical device a first capacitor configuration based on the measured impedance by determining a capacitance required for the measured impedance to produce an RC time constant that is greater than a time interval threshold and identifying the first capacitor configuration so that the first capacitance is equal to or greater than the determined capacitance, the first capacitor configuration comprising a first combination of a plurality of capacitors of a capacitor array; selecting the first capacitor configuration by selectively enabling the first combination of the plurality of capacitors; and delivering a cardiac pacing pulse by discharging the first capacitor configuration for a predetermined pulse width across the extra-cardiovascular pacing electrode vector; sampling the amplitude of the pacing pulse after a first portion of the pulse width; comparing the sampled pacing pulse amplitude to a first amplitude threshold; determining a second capacitor configuration in response to the sampled pacing pulse amplitude being less than or equal to the first amplitude threshold; selecting the second capacitor configuration by selectively enabling the second combination of the plurality of capacitors of the capacitor array; and continuing delivering the pacing pulse by discharging the second capacitor configuration during a second portion of the pulse width, the second portion after the first portion. - View Dependent Claims (17, 18, 19, 20)
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Specification