| 摘要 |
A surgical instrument includes an elongated member connected to both a suction device for removing excised tissues and fluids and to a source of pressurized fluid. The member has an inner and outer wall with a hollow lumen extending the length of the member which connects a variably shaped ostium, extending through both walls of the member, to the suction means. The member also has peripheral channels extending the length of the member which connect the fluid source to the ostium through slits in the perimeter of the ostial wall. The slits collectively extend almost the full perimeter of the ostial wall. The slits are preferably designed so that as pressurized fluid is ejected from any point along a slit across the ostium, the fluid will come in contact with an opposing spray of fluid ejected from an opposing point in an opposing slit. The two sprays simultaneously applied across the ostium prevent the tissue from being pushed away by either spray, which in conjunction with a suction force, act to hold the tissue within the ostium as it is cut. Slit-type openings impart superior tissue cutting features compared to the nozzle-type openings of prior art devices because the cutting surface of the spray is elongated. The present invention can utilize a continuous stream from opposing slits, synchronized pulsations from opposing slits, alternating pulsations, or any combination thereof, and the frequency and intensity of the sprays can be varied to optimize tissue removal.
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