Surgery – Instruments – Corneal cutter or guide for corneal cutter
Patent
1998-06-30
2000-03-28
Buiz, Michael
Surgery
Instruments
Corneal cutter or guide for corneal cutter
A61B 1700
Patent
active
060425946
ABSTRACT:
An improved positioning assembly for positioning and holding a cornea of an eye during surgery includes a positioning segment, a suction force operably coupled to the positioning segment to temporarily attach it to the eye, and a suction enhancement member. The positioning segment includes a retention plate, having an aperture defined therein to receive the cornea of the eye for engagement with an interior rim disposed in surrounding relation about the aperture, and a flange member extending downwardly from the retention plate in spaced, surrounding relation to the aperture. The positioning segment further includes a vacuum port in fluid flow communication with a point radially exterior of the aperture such that a suction force applied therethrough secures the positioning segment to the eye with the cornea protruding through the aperture. The suction enhancement member preferably includes a resilient material segment structured to engage the positioning segment at a point radially exterior of the aperture, and disposed to define a suction channel between the suction enhancement member and the positioning segment, which channel is in fluid flow communication with the vacuum port. A plurality of suction ports are preferably defined in the segment and in fluid flow communication with the suction channel. When a suction force is applied to the positioning segment, the suction enhancement member effects an improved vacuum seal about the eye and prevents partial or complete occlusion of the suction force.
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patent: 5009660 (1991-04-01), Clapham
patent: 5092863 (1992-03-01), Schanzlin
patent: 5108412 (1992-04-01), Krumeich et al.
patent: 5489299 (1996-02-01), Schachar
patent: 5772675 (1998-06-01), Hellencamp
Buiz Michael
Lewis William W.
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