Abstract: A tubing replaceable, peristaltic pump includes a base plate and a rotor mounted on the base plate and having peripherally spaced thrust rollers. Pivotally mounted on the base plate on opposite sides of the rotor are a pair of stator members which are swingable about proximate laterally spaced ends thereof between closed and open positions with their inner concave cylindrical faces confronting the rotor being respectively proximate and coaxial with the rotor and remote from the rotor. Hand operated devices are located at the free ends of the stator members and swing the stator members between locked closed positions and open positions. A flexible collapsible tube is entrapped between the rotor and closed stator members and is replaceable when the stator members are in opened position, the tube extending radially outwardly between the stator member laterally spaced front ends. If desired the stator members are reciprocatable towards and away from the rotor.

Abstract: Defective or unwanted tissue is removed such as from the lens of an eye by directing a pulsating high velocity liquid jet onto the defecting tissue to disintegrate the tissue and sucking the liquid entraining the disintegrated tissue from the area adjacent the tissue by a suction conduit. A control system is provided to insure the proper amount of suction. The control system also monitors the suction conduit and in response to a sudden change in pressure resulting from a clogging condition, the sucking action is reversed causing pressure to be forced through the conduit. Salt crystals can be added into the liquid stream of the pulsating liquid to improve the cutting action.

Abstract: Defective or unwanted tissue is removed such as from the lens of an eye by directing a pulsating high velocity liquid jet onto the defecting tissue to disintegrate the tissue and sucking the liquid entraining the disintegrated tissue from the area adjacent the tissue by a suction conduit. A control system is provided to insure the proper amount of suction. The control system also monitors the suction conduit and in response to a sudden change in pressure resulting from a clogging condition, the sucking action is reversed causing pressure to be forced through the conduit. Salt crystals can be added into the liquid stream of the pulsating liquid to improve the cutting action.