| 摘要 |
An instrument for producing a fistula through a tissue wall of an eye of a patient. The instrument has a housing with a flat blade supported in the housing for penetrating through the tissue wall to form an incised slit in the wall forming a tunnel therein. By rotating the housing and the flat blade a lamellar flap can be formed at the top of the tunnel. The housing contains a second cutting device to remove a large portion of tissue material at the bottom of the tunnel producing an aperture joined to the slit for forming the fistula. The cutting device can be a curved blade having a scoop-shaped cross-section, a punch or an optical fiber capable of transmitting a laser beam. The cutting device is operated while the flat blade remains in the tunnel.
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