| 摘要 |
An electrosurgical instrument has coaxial inner and outer tubular members (1,2) made of a conductive material to form a coaxial transmitting line. The inner member (1) is preferably dimensioned to receive a laparoscopic tool with the working elements of the tool projecting beyond a distal end (1D) of the inner member (1). Alternatively, the inner member (1) may, itself, incorporate a working element at its distal end. The outer member (2) is connected to the inner member (1) at a distance from the distal end (1D) of the later, and a radio frequency (r.f.) feed (4) is connected to the inner member (1) distally of the connection (7) between the inner and outer members. Between the connections there is an r.f. isolating structure formed by or associated with the inner member (1) to present a series impedance between the connections (4,7) at an operating frequency of the instrument.
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