Radial keratotomy knife and system using same

Details Radial keratotomy knife and system using same Radial keratotomy knife and system using same

1985-08-29

1988-06-14

Millin, V.

Surgery

Truss

Pad

128305, 351205, A61B 1732, A61F 1732

Patent

active

047504897

ABSTRACT:
A radial keratotomy knife which includes an accurate linear position transducer for digitally displaying the extension of a surgical blade beyond a footplate on the knife. A system is also disclosed for zeroing the blade position relative to the footplate. The system includes a zeroing sleeve having a reflective membrane to reflect light to a detector. The knife is inserted into the sleeve so that the footplate is in contact with the membrane within the system contained within a console. When the blade is advanced to contact the reflective membrane from within the sleeve, the reflected light pattern is altered to establish accurately a zero position of the knife blade relative to the footplate. The knife is then withdrawn from the sleeve and the blade advanced by a micrometer so that the transducer produces a signal relative to the reference level indicating the extension of the blade.

REFERENCES:
patent: 4324044 (1982-04-01), Shahinian, Jr.
patent: 4340059 (1982-07-01), Marinoff
patent: 4406285 (1983-09-01), Vissasenor et al.
patent: 4473076 (1984-09-01), Williams et al.
patent: 4499898 (1985-02-01), Knepshield et al.
patent: 4516575 (1985-05-01), Gerhard et al.
patent: 4546773 (1985-10-01), Kremer et al.
Schaevitz Technical Bulletin 10002D, "LVDT and RVDT Linear and Angular Displacement Transducers", 5/85.
Silicon Detector Corp., "Position Sensors" (Quad Detection Circuitry).
KOI Associates, Model KO 100000-21/Model KO 100000-21 (Diamond Knife).

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