| 摘要 |
A tool ( 1, 31 ) for cutting bone comprises an elongate blade ( 7,37 ) connectable to a generator of longitudinal-mode ultrasonic vibrations. The blade ( 7,37 ) has two lateral cutting edges ( 9,10 ) linked by a rounded distal tip ( 8 ). A series of triangular teeth ( 13 ) extends along each cutting edge ( 9,10 ) and the distal tip ( 8 ). The blade ( 37 ) may taper towards each cutting edge ( 9,10 ) and the distal tip ( 8 ). A variant of the tool ( 21 ) comprises an elongate part-cylindrical blade ( 27 ) connectable to a generator of torsional-mode ultrasonic vibrations. The blade ( 27 ) has a cutting edge at its distal tip ( 28 ) provided with a plurality of triangular teeth ( 23 ). All forms of the tool ( 1, 21, 31 ) are particularly suitable for cutting cancellous bone around an implant to be removed during revision of a joint arthroplasty. |
