| 摘要 |
<p>A fluidic flow system is provided for use in irrigation of the anterior chamber of the eye during ultrasonic fragmentation of a cataract therein, The system comprises a handpiece with an ultrasonically vibrated hollow tip and an annular passage around the tip used to introduce fluid for irrigation purposes. The irrigation system comprises a fluid supply bottle at a predetermined height above the eye, and administration set attached to the bottle, and an inflow hose attached to the intake manifold of the handpiece and in fluid communication with the annular passage. The fluid is supplied at a pre-selected pressure of from about 10 to 100 mm Hg and the inflow means has a flow resistivity of from 0.42 to 18.5 mm Hg per ml. per min. The flow of irrigation fluid from the source into the chamber is generally limited to a maximum predetermined rate. A pressure relief valve in fluid communication with the inflow hose is responsive to a predetermined pressure between about 10 and 100 mm Hg in the inflow means for limiting the flow rate of the irrigation fluid more precisely to the predetermined rate.</p> |
