Patent US4574802A successfully refreshed from Google Patents.
US4574802A
Expired / Lapsed
US
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Surgical instrument for cutting tissue, in particular cartilage
Assignee: EWALD HENSLER
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Filing: 1984-02-01
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Granted: 1986-03-11
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Expires: 2004-02-01
Abstract
Abstract In a surgical instrument for cutting tissue and having a jaw part that comprises a stationary, U-shaped curette and a cutting part which is secured on a rotating rod rotatably supported in a tube carrying the curette, the rotating rod is according to the invention supported rotatably at both sides of the cutting part on the legs of the curette. As a result, it is possible to exert strong cutting forces without impairing the geometry of the cutting edges as a consequence of deformation of the rotating rod.
Inventors
- 👤 Reinhold Straub
- 👤 Eugen Eberhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:33
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/28; A61B17/29; A61B17/16; A61B17/1604; A61B17/1606; A61B17/1608
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A surgical instrument for cutting tissue, in particular cartilage, having a jaw part comprising a stationary U-shaped curette, which is secured to a tube connected to a handle part, its U legs being oriented toward the axis of the tube, and a cutting part movable into an open inner face of the curette, the cutting part being secured on a rotating rod that is disposed coaxially in the tube and is rotatable; the improvement including a sleeve and wherein said rotating rod protrudes axially beyond said cutting part and is supported in said sleeve, which is in axial alignment with the tube and is provided on that leg of the U of the curette remote from the tube.
Claim 2
Dependent Claim
118 words
A surgical instrument for cutting tissue, in particular cartilage, having a jaw part comprising a stationary U-shaped curette, which is secured to a tube connected to a handle part, its U legs being oriented toward the axis of the tube, and a cutting part movable into an open inner face of the curette, the cutting part being secured on a rotating rod that is disposed coaxially in the tube and is rotatable; the improvement including a sleeve and wherein said rotating rod protrudes axially beyond said cutting part and is supported in said sleeve, which is in axial alignment with the tube and is provided on that leg of the U of the curette remote from the tube.
Claim 3
Dependent Claim
22 words
An improved surgical instrument as defined by claim 1, wherein said curette is open between ends of legs of said U-shaped curette.
Claim 4
Dependent Claim
26 words
An improved surgical instrument as defined by claim 1, wherein said cutting part is curved in concave fashion from its cutting edge toward its center point.
Claim 5
Dependent Claim
26 words
An improved surgical instrument as defined by claim 1, wherein said cutting part is curved in concave fashion from its cutting edge toward its center point.
References Cited (Backward Citations)
US4499899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |