| 摘要 |
A configuration wherein the tip portion 1a of the cylindrical body 1, which constitutes the main body of the cannula, is closed with the membrane 2 made of a polymer material having elasticity and flexibility. Preferably, the cylindrical body 1 and the membrane 2 are integrally molded with the same membrane material. Thereby, the fluids in the eyeball are prevented from coming off through the cannula even when an instrument is removed. Also, provided that the cylindrical body 1 is made to have a partially swollen fusiform shape, a curved-tip instrument can be inserted. Also, provided that a projection is provided on the outer face of the cylindrical body, the cannula is prevented from coming off from the eyeball during surgery is prevented.
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