| 摘要 |
An electrotherapy apparatus includes a connecting mechanism coupled between an energy source and a pair of electrodes for contacting a patient. A controller coupled to the energy source configures the energy source to provide a selected one of a plurality of energy levels. The controller actuates the connecting mechanism to couple the energy source to the electrodes. A sensor coupled to the controller measures a parameter or parameters related to the energy delivered to the patient through the electrodes. The controller performs an operation using the output received from the sensor. Based upon the operation, the controller actuates the connecting mechanism to decouple the energy source from the electrodes. In an embodiment of the electrotherapy apparatus, the energy source includes a high voltage power supply for charging a capacitor to a selected one of a plurality of initial voltages. The sensor includes a voltage sensor to measure the voltage across the capacitor and a current sensor to measure the current supplied by the capacitor. The connecting mechanism includes electronic switches coupled between the capacitor and the electrodes to permit application of an electrotherapy waveform in either polarity. The controller performs the operation using the measured voltages and currents to control the electronic switches. The operation may include computing the patient impedance, determining a time constant of the voltage or current, determining a quantity of charge delivered to the patient, or determining the time required for the voltage or current to substantially equal a predetermined fraction of the voltage or current.
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