| 摘要 |
A precision intraocular surgical tool for removal or severing and removal of tissue from the eyeball of a patient includes a first tube of very small diameter having a port near one end, with the port including a tissue-shearing portion and, towards the closed end of the tube, a portion of substantially smaller size than the tissue-shearing portion, and a second tube concentric with the first tube. The first and second tubes fit snugly together, and one of the tubes is slidable with respect to the other. The end of the second tube adjacent to the port has a sharp cutting edge portion, and may also include a second smooth portion. The tool includes a mechanism for drawing tissue into the port for moving one of the tubes so that the sharp cutting edge portion can cross the port and cut tissue sucked into the port or, alternatively, so that the opening in the port can be restricted to the smaller-sized portion for aspirating tissue from the eyeball of a patient without cutting such tissue.
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