3693613 is referenced by 270 patents and cites 6 patents.

A flow control system is used in conjunction with a surgical handpiece for the removal of unwanted material in a very small enclosed operative site in which it is very critical to maintain a pressure within a certain range, such as in the surgical operation of the removal of a cataract lens from the human eye. The system includes an irrigation subsystem comprising a source of treatment fluid, such as an artificial aqueous solution, at a preselected constant pressure for supplying said fluid to the enclosed operative site via the handpiece. A suspension of the treatment fluid, including any unwanted material, is removed from the operative site by an aspiration subsystem. The aspiration subsystem comprises a pump used to remove the suspension and to overcome the friction and other losses throughout the entire fluid system, a flow transducer for measuring the rate of flow, and a vent valve to reduce the flow in the aspiration subsystem when necessary to assist in maintaining a relatively constant pressure within the operative site. An electronic flow control receives signals from the flow transducer and reacts to certain changes in flow signals by sending a signal to the venting valve.

Surgical handpiece and flow control system for use therewith
Application Number
Publication Number
Application Date
December 9, 1970
Publication Date
September 26, 1972
Kelman Charles
Cavitron Corporation
G05d 11/02
A61b 17/00
A61h 01/00
A61M 01/00
A61B 17/00
A61B 17/32
A61F 09/07
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