Multiple pulse defibrillation for subcutaneous implantable cardiac devices
First Claim
1. A method of delivering a subcutaneous defibrillation therapy, comprising:
- selecting at least a pair of subcutaneous non-intrathoracic electrodes from a plurality of subcutaneous non-intrathoracic electrodes, the pair selected to provide an increased cardiac signal-to-noise ratio relative to other pairs of the plurality of subcutaneous non-intrathoracic electrodes;
sensing a fibrillation event using the selected pair of subcutaneous non-intrathoracic electrodes of the plurality of subcutaneous non-intrathoracic electrodes;
determining a fibrillation cycle length associated with the fibrillation event; and
delivering, using one or more combinations of electrodes of the plurality of subcutaneous non-intrathoracic electrodes, a plurality of defibrillation pulses to treat the fibrillation event, wherein the electrodes of each electrode combination are structurally supported in a fixed relationship such that the electrodes of each respective electrode combination are located extra-thoracically at opposing sides of the heart, and delivery of a latter pulse of the defibrillation pulses subsequent to a former pulse of the defibrillation pulses is separated in time by a first delay associated with the fibrillation cycle length.
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Accused Products
Abstract
Cardiac stimulation methods and systems provide for multiple pulse defibrillation, and involve sensing a fibrillation event, determining a fibrillation cycle length associated with the fibrillation event, and delivering a plurality of defibrillation pulses to treat the fibrillation event. Defibrillation pulses are delivered using a combination of subcutaneous non-intrathoracic electrodes. Delivery of each defibrillation waveform subsequent to a first defibrillation waveform is separated in time by a delay associated with the fibrillation cycle length. Delays between defibrillation waveform delivery may be associated with a percentage of the fibrillation cycle length.
52 Citations
40 Claims
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1. A method of delivering a subcutaneous defibrillation therapy, comprising:
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selecting at least a pair of subcutaneous non-intrathoracic electrodes from a plurality of subcutaneous non-intrathoracic electrodes, the pair selected to provide an increased cardiac signal-to-noise ratio relative to other pairs of the plurality of subcutaneous non-intrathoracic electrodes; sensing a fibrillation event using the selected pair of subcutaneous non-intrathoracic electrodes of the plurality of subcutaneous non-intrathoracic electrodes; determining a fibrillation cycle length associated with the fibrillation event; and delivering, using one or more combinations of electrodes of the plurality of subcutaneous non-intrathoracic electrodes, a plurality of defibrillation pulses to treat the fibrillation event, wherein the electrodes of each electrode combination are structurally supported in a fixed relationship such that the electrodes of each respective electrode combination are located extra-thoracically at opposing sides of the heart, and delivery of a latter pulse of the defibrillation pulses subsequent to a former pulse of the defibrillation pulses is separated in time by a first delay associated with the fibrillation cycle length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 28)
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21. A system for delivering a subcutaneous defibrillation therapy, comprising:
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a housing configured for subcutaneous non-intrathoracic placement relative to a patient'"'"'s heart; detection circuitry provided in the housing, the detection circuitry configured to detect a fibrillation event; energy delivery circuitry provided in the housing; a plurality of combinations of electrodes configured for subcutaneous non-intrathoracic placement relative to the patient'"'"'s heart, the electrodes of each electrode combination coupled to the detection and energy delivery circuitry and structurally supported in a fixed relationship such that the electrodes of each electrode combination are located extra-thoracically at opposing sides of the heart; and a controller provided in the housing and coupled to the detection and energy delivery circuitry, the controller configured to select a pair of subcutaneous non-intrathoracic electrodes from the plurality of electrode combinations based on an increased cardiac signal-to-noise ratio associated with the selected pair of subcutaneous non-intrathoracic electrodes relative to other pairs of the plurality of electrode combinations and to determine a fibrillation cycle length associated with the fibrillation event using the selected pair of subcutaneous non-intrathoracic electrodes, the controller coordinating delivery of a latter defibrillation pulse following a delay relative to delivery of a former defibrillation pulse, the delay defining a percentage of the fibrillation cycle length. - View Dependent Claims (22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A system for delivering a subcutaneous defibrillation therapy, comprising:
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means for selecting a pair of subcutaneous non-intrathoracic electrodes from a plurality of subcutaneous non-intrathoracic electrodes, the pair selected to provide an increased cardiac signal-to-noise ratio relative to other pairs of the plurality of subcutaneous non-intrathoracic electrodes; means for sensing a fibrillation event using the selected pair of subcutaneous non-intrathoracic electrodes of the plurality of subcutaneous non-intrathoracic electrodes; means for determining a fibrillation cycle length associated with the fibrillation event; means for delivering, using a first combination of electrodes of the plurality of subcutaneous non-intrathoracic electrodes, a former defibrillation pulse to treat the fibrillation event; means for delivering, using the first combination or a second combination of electrodes of the plurality of subcutaneous non-intrathoracic electrodes, a latter defibrillation pulse following a delay relative to delivery of the former defibrillation pulse to treat the fibrillation event, the delay associated with a percentage of the fibrillation cycle length; and means for structurally supporting the electrodes of each of the first and the second electrode combinations in a fixed relationship such that the electrodes of each respective electrode combination are located extra-thoracically at opposing sides of the heart.
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Specification