EP0531756A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cam guided corneal trephine
Assignee: Wyeth Holdings LLC
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Filing: 1992-08-18
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Granted: —
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Expires: 2012-08-18
Abstract
Abstract A cam guided corneal trephine for selectively cutting a portion of an eye is provided herein. The cam-guided corneal trephine comprises a base, a coarse adjusting ring, interchangeable annular ring, interchangeable annular cams operatively supported by the adjusting ring, the annular cams having various inner round diameters or other than round dimensions, and a roller cage assembly adapted to be disposed and rotated within the annular cam, the roller cage assembly having a blade mounting means disposed therein for providing a continuous cut of the corneal tissue corresponding to the inner shape of the selected cam upon rotation of the roller cage assembly.
Inventors
- 👤 David M. Lieberman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:47
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/013
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
An ophthalmic device having a cutting blade for cutting a selected portion of the eye, comprising: base means; means to conform and secure the ophthalmic device to the eye; an interchangeable cam means operatively connected to said base and having a cam surface for determining the shape of the cut of the eye; a roller cage means having a generally annular roller cage with a plurality of rollers positioned about the periphery of said roller cage, the roller cage means being positioned within said cam means whereby upon rotation of said roller cage said rollers contact and follow the contour of said cam surface; and blade mounting means including the cutting blade positioned on said roller cage for rotational movement therewith to provide a cut of a selected portion of the eye following a path related to the cam surface.
Claim 2
Dependent Claim
140 words
An ophthalmic device having a cutting blade for cutting a selected portion of the eye, comprising: base means; means to conform and secure the ophthalmic device to the eye; an interchangeable cam means operatively connected to said base and having a cam surface for determining the shape of the cut of the eye; a roller cage means having a generally annular roller cage with a plurality of rollers positioned about the periphery of said roller cage, the roller cage means being positioned within said cam means whereby upon rotation of said roller cage said rollers contact and follow the contour of said cam surface; and blade mounting means including the cutting blade positioned on said roller cage for rotational movement therewith to provide a cut of a selected portion of the eye following a path related to the cam surface.
Claim 3
Dependent Claim
44 words
An ophthalmic device according to Claim 1 wherein said blade mounting means comprises a differential thread mechanism such that upon rotation of the roller cage means the cutting blade continuously advances a predetermined distance towards the eye per revolution of said roller cage means.
Claim 4
Dependent Claim
42 words
An ophthalmic device according to Claim 2 further comprising an adjustment ring received within the base for providing a predetermined gross adjustment of the cutting blade with respect to the surface of the eye, the adjustment ring supporting the interchangeable cam means.
Claim 5
Dependent Claim
94 words
An ophthalmic device according to Claim 3 wherein said roller cage means includes three rollers positioned about and extending beyond the periphery of said roller cage, two of said rollers being biased radially outward from said roller cage and said third roller having the blade mounting means extending axially through its center such that upon rotation of said roller cage said rollers contact and follow the contour of said cam surface and the cutting blade of said blade mounting means provides a cut of the eye defined by the shape of the cam surface.
Claim 6
Dependent Claim
36 words
An ophthalmic device according to Claim 4 wherein said cam surface defines a generally circular shape such that upon rotation of the roller cage means the cutting blade cuts a generally circular portion of the eye.
Claim 7
Dependent Claim
36 words
An ophthalmic device according to Claim 4 wherein said cam surface defines a generally oval shape such that upon rotation of the roller cage means the cutting blade cuts a generally oval portion of the eye.
Claim 8
Dependent Claim
27 words
An ophthalmic device according to Claim 3 wherein the coarse adjustment ring allows up to 6 mm of movement of the cutting blade relative to the eye.
Claim 9
Dependent Claim
32 words
An ophthalmic device according to Claim 4 wherein said differential thread mechanism provides for a 0.1 mm advancement of the cutting blade toward the eye per revolution of said roller cage means.
Claim 10
Dependent Claim
61 words
An ophthalmic device according to Claim 1 wherein said base means comprises a generally annular upper surface and said device further includes an outer cone-shaped structure connected at the top thereof to said base means and at the bottom thereof to annular suction means adapted to be placed on said eye and substantially fixed thereto by means of suction applied thereto.
Claim 11
Dependent Claim
35 words
An ophthalmic device according to Claim 9 further comprising a part of finger grips connected to and disposed on opposite sides of said base, said finger grips being angled upwardly with respect to said base.
References Cited (Backward Citations)
No citation records indexed.
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