| 摘要 |
A surgical instrument comprises a hollow tube ( 18 ) having a cutting window ( 16 ) at the distal end portion. An inner tube ( 15 ) is disposed within the tube ( 18 ) and is mounted for rotation about its longitudinal axis. A cutting tool ( 17 ) is located at the distal end of the tube ( 15 ), and is positioned adjacent to the cutting window ( 16 ). An outer tube ( 14 ) is provided over the tube ( 18 ). A motor ( 5 ) is provided for rotating the inner tube ( 15 ), and saline is fed to the cutting window ( 16 ) via a passageway ( 25 ) between the tubes ( 15 ) and ( 18 ). The inner tube ( 15 ) has a central lumen ( 24 ) through which tissue cut by the cutting tool ( 17 ) is removed under the action of a source of suction ( 12 ). The outer surface of the tube 18 is covered with an electrically insulating layer ( 22 ) and coagulating RF signals are supplied between the tube ( 18 ) and the outer tube ( 14 ) so as to coagulate tissue at the cutting window ( 16 ). Additional apertures ( 40, 42; 43, 45 ) in the outer tube ( 14 ) and the insulating layer ( 22 ) are aligned such that a portion of the hollow tube ( 18 ) is exposed other than in the area of the cutting window ( 16 ).
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