US3990453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cataract surgery
Assignee: Individual
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Filing: 1975-02-28
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Granted: 1976-11-09
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Expires: 1995-02-28
Abstract
Abstract A cutting tip for a rotary motor-driven cutting instrument for cataract surgery consists of a hollow stationary tube and a tubular cutter journaled therein and projecting therefrom, the cutting tip being open at its end and having concentric axially directed arcuate cutting edge portions. An annular passage extends between the concentric tubes, and the stationary tube has an orifice in the side close to the tip. An irrigating fluid is adapted to be discharged through the side opening of the stationary tube, and a suction connection to the internal tube is effective to remove severed tissue through the hollow rotatable internal cutter.
Inventors
- 👤 Nicholas G. Douvas
- 👤 Henry T. Dinkelkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:08
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/00736; A61F9/00763
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
An axially extending cutting tip assembly for fragmenting and coring tissue during cataract surgery comprising in combination with a supporting handle portion and an outer stator tube fixed with relation to the handle portion, an inner rotor tube rotatable about its longitudinal axis within said stator tube and projecting axially through and from a constricted and closely fitted free forward end of said stator tube, said rotor tube having a free projecting end outside the stator tube and having a sharp cutting edge at said projecting end defining a circle perpendicular to the axis of the tube.
Claim 2
Dependent Claim
97 words
An axially extending cutting tip assembly for fragmenting and coring tissue during cataract surgery comprising in combination with a supporting handle portion and an outer stator tube fixed with relation to the handle portion, an inner rotor tube rotatable about its longitudinal axis within said stator tube and projecting axially through and from a constricted and closely fitted free forward end of said stator tube, said rotor tube having a free projecting end outside the stator tube and having a sharp cutting edge at said projecting end defining a circle perpendicular to the axis of the tube.
Claim 3
Dependent Claim
12 words
The cutting tip of claim 1 wherein said cutting edge is continuous.
Claim 4
Dependent Claim
12 words
The cutting tip of claim 1 wherein said cutting edge is discontinuous.
Claim 5
Dependent Claim
22 words
The cutting tip of claim 3 wherein said cutting edge comprises a pair of diametrically opposed arcuate segments separated by axial slots.
Claim 6
Dependent Claim
32 words
The cutting tip of claim 3 wherein said cutting edge comprises a plurality of arcuate segments lying entirely in a plane perpendicular to the axis of rotation and separated by axial serrations.
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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |