Device for retaining a disc obtained from a human cornea

Details Device for retaining a disc obtained from a human cornea Device for retaining a disc obtained from a human cornea

1985-03-15

1989-12-05

Thaler, Michael H.

Surgery

Truss

Pad

128303R, A61B 1732

Patent

active

048845701

ABSTRACT:
Apparatus to retain a disc obtained from a human cornea during a cutting operation to alter the surface of the disc. The apparatus includes a plurality of plunger-like moldings, any one of which can support the corneal disc. The molding is interchangeably supported in a recess provided in a support member. The support surface of the molding is concave or convex with a predetermined curvature and gaspervious openings communicate with an evacuation chamber so that a corneal disc can be sucked against the corneal support surface by a negative pressure. A pressure ring engages the edge of the corneal disc for clamping it between the pressure ring and molding. A guideway for a transversely-movable cutting device ring and molding. The molding can be formed with a number of bores or constructed of porous material. The apparatus is used by selecting a particular molding with a corneal disc-receiving surface that is either convex when minus values are required or concave when plus values are required.

REFERENCES:
patent: 3058471 (1962-10-01), Shape
patent: 3074407 (1963-01-01), Moon et al.
patent: 3129971 (1964-04-01), Kobler
patent: 3139298 (1964-06-01), Grabiel
patent: 4077411 (1978-03-01), Ward
patent: 4236519 (1980-12-01), La Russa et al.
patent: 4526171 (1985-07-01), Schachar
patent: 4660556 (1987-04-01), Swinger et al.

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