| 摘要 |
<p>An apparatus for introducing a predetermined volume of enzyme solution into the lens of an eye comprising:a) a liquid dispenser connectible to a reservoir of enzyme solution,b) a source of gas,c) a multiport valve having therein at least four ports,d) a cannula, said liquid dispenser, gas source and cannula being each connected to a different valve port, the fourth valve port being an exhaust port, said valve having therein two reversible channels connectible to said ports two by two with the gas source connecting to the exhaust port and the liquid dispenser port connecting to the cannula, the combined volume within said cannula and the valve port connected to the cannula being predetermined to correspond to a single dosage volume of enzyme solution to be introduced into the lens, and the volume of each valve channel being greater than the single dosage volume of enzyme solution to be introduced, whereby enzyme solution may pass from said reservoir through one channel of said valve into the cannula, while gas passes from the gas source through the second channel of said valve to the exhaust port of said valve, then upon complete valve reversal interposing the gas containing second channel in line between enzyme reservoir and cannula, all gas trapped in said second channel by the valve reversal becomes a gaseous separator limiting continuous enzyme solution flow out of the cannula to the single dosage volume already downstream of the gaseous separator, and the source for a gas separator capable of sealing off the track made by cannula penetration into the lens.</p> |
