Method and device for determining placement of keratotomy incisi

Details Method and device for determining placement of keratotomy incisi Method and device for determining placement of keratotomy incisi

1995-05-02

1997-03-18

Buiz, Michael Powell

Surgery

Instruments

Corneal cutter or guide for corneal cutter

606170, 606172, A61F 900

Patent

active

056118058

ABSTRACT:
A keratotomy incision is formed in a cornea by manipulating an RK knife so that its blade extends a preselected depth into a point on the cornea. Sufficient force is applied by a surgeon's fingers to the knife to advance its blade in a preselected direction. Advancement of the blade is halted when resistance of the cornea against the blade exceeds a certain level. In one embodiment, a plurality of such incisions are formed in a predetermined pattern until a final incision is made wherein resistance of the cornea against the leading edge of the blade exceeds the particular level at the starting point for that final incision. The blade then is withdrawn from the cornea, whereby the plurality of incisions reduce strain in collagen fibrils of the cornea so as to correct a refractive error associated with such strain.

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"Introduction to Biomechanics of the Cornea" by Kurt A. Buzard, MD, FACS, Retractive & Corneal Surgery, vol. 8, Mar./Apr. 1992, pp. 127-138.

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