Electrotherapy method and apparatus for external defibrillation
DC CAFCFirst Claim
1. A method for operating an external defibrillator comprising:
- discharging an energy source across electrodes in electrical contact with the exterior of a patient in a truncated exponential biphasic waveform;
monitoring a patient-dependent electrical parameter during the discharging step; and
controlling duration of the truncated exponential biphasic waveform based on a value of the electrical parameter to be approximately 20.3 mS or less for all values of the electrical parameter.
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Litigations
1 Petition
Accused Products
Abstract
An electrotherapy method and apparatus for delivering a multiphasic waveform from an energy source to a patient. The preferred embodiment of the method comprises the steps of charging the energy source to an initial level; discharging the energy source across the electrodes to deliver electrical energy to the patient in a multiphasic waveform; monitoring a patient-dependent electrical parameter during the discharging step; shaping the waveform of the delivered electrical energy based on a value of the monitored electrical parameter, wherein the relative duration of the phases of the multiphasic waveform is dependent on the value of the monitored electrical parameter. The preferred apparatus comprises an energy source; two electrodes adapted to make electrical contact with a patient; a connecting mechanism forming an electrical circuit with the energy source and the electrodes when the electrodes are attached to a patient; and a controller operating the connecting mechanism to deliver electrical energy from the energy source to the electrodes in a multiphasic waveform the relative phase durations of which are based on an electrical parameter monitored during delivery of the electrical energy. The preferred defibrillator apparatus weighs less than 4 pounds and has a volume less than 150 cubic inches, and most preferably, weighs approximately three pounds or less and has a volume of approximately 141 cu.in.
120 Citations
11 Claims
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1. A method for operating an external defibrillator comprising:
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discharging an energy source across electrodes in electrical contact with the exterior of a patient in a truncated exponential biphasic waveform; monitoring a patient-dependent electrical parameter during the discharging step; and controlling duration of the truncated exponential biphasic waveform based on a value of the electrical parameter to be approximately 20.3 mS or less for all values of the electrical parameter. - View Dependent Claims (2, 3, 4, 5)
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6. An external defibrillator comprising:
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a capacitive energy source sized between 60 and 150 microfarads; two electrodes adapted to make electrical contact with the exterior of a patient; a connecting mechanism forming an electrical circuit with the energy source and the electrodes when the electrodes are attached to a patient; and a controller operating the connecting mechanism to deliver electrical energy from the energy source to the electrodes in a truncated exponential biphasic waveform. - View Dependent Claims (7)
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8. A method of operating an external defibrillator, the method comprising:
discharging a single capacitor across electrodes in a truncated exponential biphasic waveform, the capacitor having a capacitance of between 60 and 150 microfarads. - View Dependent Claims (9)
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10. A method of operating an external defibrillator, the method comprising:
discharging a single capacitor across electrodes in a truncated exponential biphasic waveform delivering less than 155 joules to a patient. - View Dependent Claims (11)
Specification