Controlled outflow sleeve

摘要

Method and apparatus for removing a natural lens from an eye provides for inserting an infusion cannula into an anterior chamber of an eye and establishing fluid communication into a lens capsule from the anterior chamber. A phacoemulsification needle is inserted into the lens capsule for emulsification of a natural lens while introducing irrigation fluid into the anterior chamber and lens capsule through the infusion cannula. Emulsified lens is aspirated through a lumen in the phacoemulsification needle and a sleeve, surrounding the phacoemulsification needle, enables outflow of irrigation fluid in order to maintain intraocular pressure and cool the phacoemulsification needle.