Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1998-11-23
1999-11-09
Fox, John
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137102, F16K 3104
Patent
active
059794941
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.
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Applebaum Peter F.
Painter John A.
Perkins James T.
Bausch & Lomb Surgical, Inc.
Fox John
Kang Grant D.
Vacca Rita D.
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