Patent ID: 7860565

Claim:
A defibrillator adapted to selectively provide defibrillation pulses in a defibrillation mode and pacing pulses in a pacing mode, comprising: patient electrodes; a power source for providing power; an energy delivery system coupled to the power source and the electrodes, having; a controllable charging circuit coupled to the power source and configured to generate electrical energy and current pulses, and a capacitance storage circuit coupled to the charging circuit, for storing the electrical energy and for filtering the current pulses, the energy delivery system configured to generate electrical energy, store the electrical energy in the storage circuit, and couple the stored electrical energy to the patient electrodes to deliver the defibrillation pulses in the defibrillation mode, and further configured to generate current pulses and couple the current pulses to the patient electrodes via the storage circuit to deliver the current pulses as pacing pulses in the pacing mode; and a controller coupled to the energy delivery system, having a measuring circuit responsive to pacing pulses delivered during the pacing mode for producing a pacing control signal, including sensing resistors and a switch coupled in parallel between the capacitance storage circuit and the patient electrodes; and a control circuit responsive to the pacing control signal and coupled to the charging circuit to control the charging circuit to produce a pacing current in the pacing mode, wherein the controller closes the measuring circuit switch to bypass the sensing resistors during the defibrillation mode.