| 摘要 |
A cannula (10) is provided having a tube (11) and an enlarged rib (13) or hub (12). The hub is attached to the proximal end of the tube so that the distal end of the tube may be inserted into an incision up to the hub. The hub acts as a stop to prevent the entire cannula from entering the incision. The distal end of the tube contains a biased flap (20) that seals the distal end of the tube while still allowing a surgical instrument to be inserted into the incision through the tube, for example during ophthalmic surgery. |
