| 摘要 |
An electrosurgical instrument is provided for the treatment of tissue, the instrument comprising an instrument shaft (10) having a longitudinal axis, and an electrode assembly at one end of the shaft. The electrode assembly comprises first and second active electrodes (11), (14) and at least one return electrode (25), the electrodes being electrically insulated one from another by means of one or more insulation members (12). The first and second active electrodes (11, 14) each have an exposed surface for treating tissue, the exposed surface (19) of the first active electrode being such as to treat tissue disposed laterally of the longitudinal axis at a first radial position with respect to the instrument shaft, The exposed surface (15) of the second active electrode is such as to treat tissue disposed laterally of the longitudinal axis at a second radial position with respect to the instrument shaft. The instrument has a first set of connections by which the first active electrode (11) can be placed in circuit with the return electrode (25), and a second set of connections by which the second active electrode (14) can be placed in circuit with the return electrode (25). |
