Instruments for use in performing gel injection adjustable kerat

Details Instruments for use in performing gel injection adjustable kerat Instruments for use in performing gel injection adjustable kerat

1994-09-01

1997-03-04

Thaler, Michael H.

Surgery

Instruments

Corneal cutter or guide for corneal cutter

606172, A61B 1700

Patent

active

056074379

ABSTRACT:
The present invention provides a surgical technique and instrument kit that allows for subtle modification of the corneal curvature by interlamellar injection of a synthetic gel at the corneal periphery while sparing the optical zone. The gel viscosity, volume and disposition within the surgical annular track as well as the diameter of the track, width, depth, and location are all parameters in the refractive change obtained. Following ultrasonic pachymetry performed centrally and at a selected wound entrance located about 2.5 to 3.5 mm from the apex, a one millimeter or so wide, about 75-85% corneal thickness depth radial incision is performed with a micrometric diamond knife adjusted to about 86% corneal thickness. Inserted through the partial-depth incision, a corkscrew-like dissector or helicoidal spatula forms a 360.degree. annular track centered about the apex. A transparent gel is manually injected through the incision, filling the annular channel. Using a surgical keratometer mounted to an operation microscope, the final corneal power is adjusted by massaging and removing the gel as necessary during the primary procedure or subsequent procedures, as the GIAK technique is reversible.

REFERENCES:
patent: 2550763 (1951-05-01), Bowder
patent: 2586009 (1952-02-01), Dickey
patent: 2801633 (1957-08-01), Ehrlich
patent: 3789830 (1974-02-01), Malmstrom
patent: 4657011 (1987-04-01), Gaba
patent: 5071421 (1991-12-01), Stahl
patent: 5174279 (1992-12-01), Cobo et al.
patent: 5224950 (1993-07-01), Prywes

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