System of controlling astigmatism during cataract surgery

Details System of controlling astigmatism during cataract surgery System of controlling astigmatism during cataract surgery

1977-06-16

1978-11-28

Truluck, Dalton L.

Surgery

Truss

Perineal

128 2T, 1283355, 356 32, 356397, A61F 0900

Patent

active

041271092

ABSTRACT:
The present invention is a system for controlling astigmatism during cataract surgery in which a microscope, having an eyepiece, a tube and an objective lens and having a magnification power of 100 times, is used which includes a length of suture material which is adapted to close a corneal incision and which is cylindrically shaped. The length of suture material has a plurality of parallel lines, which are spaced equally at very close distances in the range of 5,000 to 20,000 lines per inch and which are disposed orthogonally to the longitudinal axis on the cylindrical surface of said length of suture material. When the strain in the length of suture material is in the range of 0.1 percent to 10.0 percent, a reticule is disposed in the microscope adjacent to the objective lens thereof. The reticule measures optically the strain in the length of suture material by comparing a plurality of parallel lines, which are equally spaced at very close distances in the range of 50 to 200 lines per inch, but at a slightly larger spacing than 100 times the line spacing on the length of suture material, and which are aligned optically with the plurality of parallel lines on the length of suture material so that strain may be optically read from the interference formed by the two pluralities of parallel lines.

REFERENCES:
patent: 2984147 (1961-05-01), Schoepe et al.
patent: 3194236 (1965-07-01), Sullivan
patent: 3840015 (1974-10-01), Gain
patent: 3949755 (1976-04-01), Vauquois

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