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.

Title
Surgical handpiece and flow control system for use therewith
Application Number
05/096,473
Publication Number
3693613
Application Date
December 9, 1970
Publication Date
September 26, 1972
Inventor
Kelman Charles
Assignee
Cavitron Corporation
IPC
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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