Pneumatic controls for ophthalmic surgical system

Details Pneumatic controls for ophthalmic surgical system Pneumatic controls for ophthalmic surgical system

1993-09-27

1995-05-23

Fox, John C.

Fluid handling

Systems

With flow control means for branched passages

137883, F16K 1100

Patent

active

054172462

ABSTRACT:
A pneumatic control system for providing pressurized air and vacuum to ophthalmic microsurgical instruments. The pneumatic system is constructed in a drawer assembly to allow it to be readily inserted into or removed from a modularly constructed cabinet of a microsurgical control console. In addition, the pneumatic system improves upon existing pneumatic control systems by providing a third mode of microscissors operation from a single-pneumatic port. The third mode is made possible by a high speed three-way solenoid control valve which provides rapid pulses of air to the pneumatic port. A second improvement involves the use of a pneumatic pressure transducer to monitor pneumatic pressure being supplied to the pneumatic system in order to recognize non-hazardous transient drops in air pressure which can occur under certain normal operating conditions. A third improvement relates to the use of an intraocular pressure accumulator downstream from a final solenoid-operated pinch valve, which reduces fluctuations in air pressure and has other advantages.

REFERENCES:
patent: 4727791 (1988-03-01), Satoh
patent: 5065794 (1991-11-01), Cheung

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