Surgery – Truss – Perineal
Patent
1982-01-04
1984-06-05
Thaler, Michael H.
Surgery
Truss
Perineal
128303R, 128330, 3 13, A61B 1700
Patent
active
044522355
ABSTRACT:
A system for adjusting the curvature of the cornea of the eye involves inserting a plastic split end adjusting ring into the stroma of the cornea by first making a first incision in the cornea above the corneal ring at about the eight millimeter chord, then inserting one end of a metal split end dissecting ring into the incision with the trailing end of the dissecting ring remaining outside the cornea. A connecting link member is inserted through the holes in the ends of the respective dissecting and adjusting rings to releasably join the two rings, the rotational direction of the holding tool is then reversed which "backs out" the dissecting ring and at the same time pulls in behind it the plastic adjusting ring. When the now joined ends of the two rings are rotated back around to the insertion point, the now withdrawn dissecting ring is released from the adjusting ring. A corneascope type image of the corneal topography is displayed on a visual surface and compared to a desired target image. Adjustment is then made in the relative position of the ends of the adjusting ring to change the shape of the cornea to bring the image of the present shape into coincidence with the desired shape whereupon the two ends of the adjusting ring are fixedly joined to maintain the desired shape.
REFERENCES:
patent: 4332039 (1982-06-01), La Fuente
patent: 4346482 (1982-08-01), Tennant et al.
patent: 4346713 (1982-08-01), Malmin
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