Ophthalmic aspirator-irrigator

Details Ophthalmic aspirator-irrigator Ophthalmic aspirator-irrigator

1986-07-17

1987-11-10

Coven, Edward M.

Surgery

Means for introducing or removing material from body for...

Material introduced into and removed from body through...

604 22, 604 30, A61B 1732

Patent

active

047055006

ABSTRACT:
An ophthalmic aspirator-irrigator system for use during cataract surgery is disclosed. The system frees both hands of the surgeon for the surgical tasks and leaves the automatic operation of the system to a single control input operated by a foot pedal. The pedal controls both the aspiration and ejection functions as well as their respective speeds. The opthalmic aspirator-irrigator system essentially comprises a hand-held device, a control box operable by the foot pedal and a power cord connecting the device with the box. A source of fluid is connected via a tube to the device to effect the irrigation function. The control box includes a power source and a circuit coupled to the source and via the cord to the device. Preferably, the circuit includes a bridge output network controlled by a linear motion slide type potentiometer controlled by the foot pedal. The circuit further includes dual DC amplifiers and a pulse-width modulated gate circuit to operate the device bidirectionally with a smooth, continuous and varibale speed. The foot pedal has two zero control positions: in its off, non-depressed position and in its off position about midway through the pedal's downward travel.

REFERENCES:
patent: 4184510 (1980-01-01), Murry et al.
patent: 4299221 (1981-11-01), Phillips et al.
patent: 4493695 (1985-01-01), Cook
patent: 4516398 (1985-05-01), Wuchinich
patent: 4517977 (1985-05-01), Frost
patent: 4609368 (1980-09-01), Dotson

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