| 摘要 |
<p>This invention is a trocar consisting of a trocar (17) in a central opening in a cannula. The cannula is provided with at least one separate passage (23) running parallel to the central passage. The separate passage (23) is connected to a source of cleansing fluid and a pumping means for pumping fluid through the separate passage. The separate passage terminates in an orifice (22) near the distal end of the central opening of the cannula. In operation, when the cannula is used to provide access for a laparoscope or other viewing instrument, the end of the viewing instrument may become clouded with moisture and other debris. In this case, the end of the viewing instrument may be withdrawn into the distal end of the cannula adjacent the fluid orifices. The pumping means is actuated and cleansing fluid is forced over the end of the instrument cleaning away the obstructing matter without removing the instrument from the cannula. Drying air can also be supplied to the instrument, either through the same or different separate passage. The orifice can provide a concentrated stream or a diffuse spray and can be configured to discharge the fluid with a rearward component.</p> |
