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Extra-cardiovascular cardiac pacing system

  • US 10,080,891 B2
  • Filed: 12/03/2015
  • Issued: 09/25/2018
  • Est. Priority Date: 12/03/2015
  • Status: Active Grant
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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