| 摘要 |
An impedance feedback electrosurgical system (100) is useful with electrosurgical tools (104) to maintain a substantially constant level of current wihtin the tissue in contact with the tool. The system comprises active and return electrodes (108, 112) associated with an electrosurgical tool (104), an impedance device (116) and a power control unit (118). Energy sufficient to affect tissue is delivered through the active electrode (108) to tissue and to the return electrode (112). The impedance measuring device (116) is in circuit with the return electrodes (112) and measures the impedance of tissue. A signal representative of tissue impedance is communicated from the impedance measuring device (116) to the power control unit (118). The power control unit (118) adjusts the energy applied to tissue to maintain tissue impedance within a pre-selected and desired range.
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