Self adjusting optimal waveforms
AssigneePacesetter, Inc.
InventorsSteve Hofstadter, Mark W. Kroll
Life of this patent
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Abstract
An exemplary method includes detecting fibrillation, measuring impedance of a defibrillation circuit that includes myocardial tissue, determining one or more defibrillation shock parameters based at least in part on the impedance, delivering a defibrillation shock using the one or more defibrillation shock parameters and, if the shock was unsuccessful, adjusting a membrane time constant and determining one or more new defibrillation shock parameters based at least in part on the adjusted membrane time constant. Various other exemplary methods are disclosed as well as various exemplary devices, systems, etc.
Claims13
An implantable apparatus for implanting in a patient, said apparatus comprising:
- a power source;
- one or more capacitors chargeable by the power source;
- an electrode-bearing implantable lead connectable to the one or more capacitors;
- and
- control logic configured to detect fibrillation, to decide whether the patient has ischemia, to determine one or more defibrillation shock parameters based at least in part on a membrane time constant which is based on whether the patient has ischemia, and to call for delivery of a defibrillation shock using the lead and the one or more defibrillation shock parameters.
An implantable apparatus for implanting in a patient, said apparatus comprising:
- a power source;
- one or more capacitors chargeable by the power source;
- an electrode-bearing lead connectable to the one or more capacitors;
- a circuit to measure impedance via the electrode-bearing lead;
- and
- control logic configured to detect fibrillation, to decide whether the patient has cardiac ischemia, to select a defibrillation shock duration based at least in part on the deciding, to deliver a defibrillation shock using the lead and the selected defibrillation shock duration, to decide whether the shock was unsuccessful and, if the shock was unsuccessful, to adjust the defibrillation shock duration and to deliver another defibrillation shock using the adjusted defibrillation shock duration.
An implantable apparatus for implanting in a patient, said apparatus comprising:
- a power source;
- one or more capacitors chargeable by the power source;
- an electrode-bearing lead connectable to the one or more capacitors;
- and
- control logic configured to detect fibrillation, to commence delivery of a defibrillation shock using the lead, to decide whether the patient has ischemia, to determine one or more defibrillation shock parameters based at least in part on a membrane time constant which is based on whether the patient has ischemia and to adjust one or more defibrillation shock parameters during delivery of a defibrillation shock.
Dependencies are inferred from the claim text.