| 摘要 |
Disclosed is an instrument useful for effecting aspiration and irrigation during ophthalmic surgery. The disclosed embodiment comprises two, telescopically disposed cannulae and a connector which couples the two cannuli and forms fluid-tight seals with each. Each cannula consists of a rigid, small-diameter tube and a Luer hub (or "mount") coaxial therewith. The tube of the inner cannula is telescopically disposed within the outer cannula, the diameters of the cannulae being such that a passage is defined therebetween. The connector is of one-piece, rigid construction and includes a generally cylindrical body having a first nipple extending axially from one of its ends and a second nipple extending radially from one side. The first nipple is frictionally engaged within and forms a fluid-tight seal with the hub of the outer cannula. A cavity extends from the end of the first nipple through the body of the connector and terminates at the end of the body remote from the nipple. The tube of the inner cannula extends through the cavity and the hub and tube of the outer cannula. A portion of the connector body defining the mentioned cavity forms a fluid-tight seal with the exterior of the tube of the inner cannula. A passage extends from the cavity in the connector to the tip of the second nipple. The second nipple is coupled to a tubing via which irrigating fluid can be supplied to the instrument. In use, irrigating fluid is transmitted via the passage through the second nipple to the cavity and thence through the passage defined between the inner and outer cannulae. The hub of the inner cannula is connected to a syringe by which a vacuum can be applied to the passage defined by the inner cannula to effect aspiration of fluid from the surgical site through the inner cannula.
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