Surgery – Instruments – Cutting – puncturing or piercing
Patent
1993-02-12
1995-02-21
Lewis, Ralph A.
Surgery
Instruments
Cutting, puncturing or piercing
606166, 30162, 30151, A61B 1732
Patent
active
053911776
ABSTRACT:
An ophthalmic lance includes a retractable blade and a sheath, the retractable blade can only be exposed when a button is pressed down. The blade is attached to a spring loaded stem so that when the button is released, the blade is automatically retracted back into the sheath. Pressure on the button at the end of the stem or on the locking pin causes the blade to be exposed. As soon as that pressure is released the blade is automatically retracted back up into the sheath. The sheath has an H-shaped cutout in which a locking pin fits in and can slide about. The locking pin is coupled to the stem. The H-shaped cutout has a short-leg, a long-leg and a cross-bar so that when the locking pin is inside of the short-leg, the blade is in the locked position and when the locking pin is inside of the long-leg, the stem can be depressed and the blade exposed. To switch back and forth between the locked and the unlocked positions the stem must be rotated relative to the sheath so that the locking pin travels between the short-leg and the long-leg through the cross-bar of the H-shaped cutout.
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