Patent US4099529A successfully refreshed from Google Patents.
US4099529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-angle cutter vitrophage
Assignee: Individual
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Filing: 1976-09-20
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Granted: 1978-07-11
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Expires: 1996-09-20
Abstract
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.
Inventors
- 👤 Gholam A. Peyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/00736; A61F9/00763
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
225 words
A surgical instrument for performing intraocular surgery involving the removal of fibrous tissue from within the eye of a patient and having a control handle carrying a small diameter probe for insertion into the eye comprising: an external tube as part of the probe having an external wall and a longitudinal axis and formed with a closed end tip and a generally triangular shaped aperture in its external wall; said triangular aperture being oriented with a base edge tranverse to said longitudinal axis in close proximity to and adjacent said tip and defining a tissue engaging ledge and with an apex of said aperture being remote from said tip said base edge lying in a plane perpendicular to said longitudinal axis; an internal cutting tube coaxial with and telescoped within said external tube having a driven end and a free end with a sharp cutting edge formed on said free end; drive means connected to said driven end for causing controlled longitudinal oscillation of said internal tube within said external tube and operable in its oscillation to carry said cutting edge past said base edge of said aperture; and means defining a sharp shearing edge formed on an inner edge of said aperture base and effective in shearing coaction with said cutting edge of said internal tube to cleanly sever tissue engaged by said ledge.
Claim 2
Dependent Claim
225 words
A surgical instrument for performing intraocular surgery involving the removal of fibrous tissue from within the eye of a patient and having a control handle carrying a small diameter probe for insertion into the eye comprising: an external tube as part of the probe having an external wall and a longitudinal axis and formed with a closed end tip and a generally triangular shaped aperture in its external wall; said triangular aperture being oriented with a base edge tranverse to said longitudinal axis in close proximity to and adjacent said tip and defining a tissue engaging ledge and with an apex of said aperture being remote from said tip said base edge lying in a plane perpendicular to said longitudinal axis; an internal cutting tube coaxial with and telescoped within said external tube having a driven end and a free end with a sharp cutting edge formed on said free end; drive means connected to said driven end for causing controlled longitudinal oscillation of said internal tube within said external tube and operable in its oscillation to carry said cutting edge past said base edge of said aperture; and means defining a sharp shearing edge formed on an inner edge of said aperture base and effective in shearing coaction with said cutting edge of said internal tube to cleanly sever tissue engaged by said ledge.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |