| 摘要 |
A control system and method for the operation of neurosurgical bipolar electrodes for application to the tissue and bodily fluids of a patient provides a source of high frequency energy connected to bipolar electrodes. Contacting surfaces are on the bipolar electrodes of highly electrically conductive material with resistance per unit area substantially less than the impedance of the tissue and bodily fluids. A current transducer attached to the source of high frequency energy responds to the RMS current applied through the tissue and bodily fluids between the contact surfaces as a measure relative to the instantaneous values of the RMS current. A current transducer attached to the source of high frequency energy responds to the RMS current through a capacitor applied across the contact surfaces to provide a signal correlated to the instantaneous values of the RMS voltage between the contacts and across the tissue and bodily fluids. A control connects to the source of high frequency energy for initially regulating the RMS current applied through the tissue and bodily fluids by the contacting surfaces in response to the impedance until the signal divided by the measure reaches a predetermined value. The control regulates the RMS power applied to the tissue and bodily fluids by the contacting surfaces in accord with the impedance until the signal divided by the measure reaches a predefined value. The control responds to the measure and the signal so that the RMS voltage applied to the impedance being treated between the contacting surfaces is regulated while monitored until a prescribed value is reached. The control regulates the RMS voltage applied to the tissue and bodily fluids by the contacting surfaces in accord with the impedance by changing the RMS voltage to a percentage of that applied until the prescribed value is obtained so that the tissue and bodily fluids being treated are moist but coagulated at the surface and not completely dry and carbonized or turned to eschar. |
