Method and apparatus for cardiac event signal sensing
AssigneeMedtronic, Inc.
InventorsRonson Lok YONG, Michael L. HUDZIAK
Life of this patent
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Abstract
A medical device is configured to sense a cardiac signal and, without rectifying the cardiac signal, apply a first cardiac event sensing threshold amplitude having a first polarity to the cardiac signal. In response to the cardiac signal crossing the first sensing threshold amplitude, the medical device may apply to the cardiac signal a second sensing threshold amplitude that has a second polarity opposite the first polarity. The medical device may determine when a requirement relating to the second sensing threshold amplitude is met by the first cardiac signal for use in confirming a sensed cardiac event signal.
Claims22
A medical device comprising:
- a therapy delivery circuit configured to deliver a therapy;
- sensing circuitry configured to:
- sense a first cardiac signal;
- without rectification of the first cardiac signal, apply a first sensing threshold amplitude having a first polarity to the first cardiac signal;
- in response to the first cardiac signal crossing the first sensing threshold amplitude, apply a second sensing threshold amplitude to the first cardiac signal, the second sensing threshold amplitude having a second polarity opposite the first polarity;
- determine when a requirement relating to the second sensing threshold amplitude is met by the first cardiac signal;
- and
- confirm a sensed first cardiac event signal corresponding to a depolarization of a first heart chamber in response to at least the first cardiac signal crossing the first sensing threshold amplitude and meeting the requirement relating to the second sensing threshold amplitude;
- and
- control circuitry configured to:
- start a first timing control interval in response to the confirmed sensed first cardiac event signal;
- and
- control at least one of the sensing circuitry or the therapy delivery circuit according to the first timing control interval.
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A method comprising:
- sensing a first cardiac signal;
- without rectifying the first cardiac signal, applying a first sensing threshold amplitude having a first polarity to the first cardiac signal;
- in response to the first cardiac signal crossing the first sensing threshold amplitude, applying a second sensing threshold amplitude to the first cardiac signal, the second sensing threshold amplitude having a second polarity opposite the first polarity;
- determining when a requirement relating to the second sensing threshold amplitude is met by the first cardiac signal;
- confirming a sensed first cardiac event signal corresponding to a depolarization of a first heart chamber in response to at least the first cardiac signal crossing the first threshold amplitude and meeting the requirement relating to the second sensing threshold amplitude;
- starting a first timing control interval in response to the confirmed sensed first cardiac event signal;
- and
- controlling at least one of sensing of the first cardiac signal or delivery of a therapy according to the first timing control interval.
Dependencies are inferred from the claim text.