Wide-angle cutter vitrophage

Details Wide-angle cutter vitrophage Wide-angle cutter vitrophage

1976-09-20

1978-07-11

Michell, Robert W.

Surgery

Truss

Pad

30247, 128276, A61B 1732

Patent

active

040995291

ABSTRACT:
An improved vitrectomy instrument having a small diameter cutting probe comprising coaxial inner and outer tubes. The outer tube is formed with a triangular cutting aperture with the base of the triangle forming a step or ledge adjacent to the tip of the probe and transverse to the axis of the tube. The sides of the triangular aperture are tapered in cylindrical section along the side of the outer tube. The inner tube is adapted to oscillate longitudinally within the outer tube and the end of the inner tube forms a shearing edge with the base of the aperture. The base or ledge functions as a hook to catch the edges of semi-solid membranes to be severed.

REFERENCES:
patent: 3776238 (1973-12-01), Peyman et al.
patent: 3815604 (1974-06-01), O'Malley et al.
patent: 3884238 (1975-05-01), O'Malley et al.
patent: 3902498 (1975-09-01), Niederer
patent: 3995619 (1976-12-01), Glatzer

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