Patent ID: 7920917

Claim:
An external defibrillator that is configured to provide a defibrillation shock through a plurality of electrodes attached to a patient, comprising: a connection port configured to be coupled to the plurality of electrodes; an energy storage device coupled to the connection port; and a controller coupled to the energy storage device, the controller configured to: measure a physical parameter of the patient at a first time instant (t 1 ); determine a charge for the energy storage device that is at least partially based on the physical parameter at a second time instant (t 2 ) that occurs after the first time instant (t 1 ); complete a physiology analysis of the patient at a sixth time instant (t 6 ) that occurs after the second time instant (t 2 ); determine a rate for charging the energy storage device to substantially achieve the charge after a fifth time instant (t 5 ) and before a seventh time instant (t 7 ), the fifth time instant (t 5 ) occurring after the second time instant (t 2 ) and before the sixth time instant (t 6 ), the seventh time instant (t 7 ) occurring after the sixth time instant(t 6 ); and begin to charge the energy storage device at the rate at a third time instant (t 3 ) that occurs after the second time instant (t 2 ) and before the fifth time instant (t 5 ).