| 摘要 |
A cable comprises a hollow tube 35 with conductive layers 33 and 37 inside and outside it. The cable can be used for conveying radiofrequency and/or microwave frequency energy to an electrosurgical instrument, and has a bore 15 through which further cables and pipes can be passed, giving a more balanced arrangement. A spindle 81 has conductive parts which make contact with both layers during complete rotation. An alternative cable has a conductive layer 105 on the outside of a dielectric tube 103, and an inner conductor which can rotate relative to these. A conductive portion 117 is mechanically attached to the inner conductor and makes contact with the outer layer during complete rotation. An actuator can be used to rotate the electrosurgical instrument. |
