Patent US4490136A successfully refreshed from Google Patents.
US4490136A
Expired / Lapsed
US
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Trocar
Assignee: METEVE A CORP OF SWEDEN AB
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Filing: 1982-09-28
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Granted: 1984-12-25
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Expires: 2002-09-28
Abstract
Abstract A surgical trocar comprising a flattened oblong unit having at the front end an angled sharpened cutting edge, and at the rear end a device for removably attaching a tube for drainage or other purposes. The trocar's cutting edge produces fissure-shaped skin incisions which heal more easily than circular wounds, and the trocar's flattened shape reduces the risk of slippage and attendant damages to the patient and/or surgeon's hand from such slippage.
Inventors
- 👤 Fred V. G. Ekbladh
- 👤 Hans Tillander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:57
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3415; A61B17/3417; A61M; A61M25/00; A61M25/01; A61M25/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
175 words
An improved trocar for making a fissure-shaped incision in skin and bringing a tube through said skin and adjacent tissue with reduced risk of slippage in or cuts to the hands of a surgeon using said trocar, comprising: a flattened oblong unit having a front end provided with a front edge arranged at an angle to the longitudinal axis of the unit to form an oblique point, a rear end provided with means for attaching a tube thereto, and two substantially flat opposed elongate surfaces intermediate said ends to be grasped by said surgeon, said unit having a width equal to about one-half of the circumference of said tube, and said front edge provided with at least one facet that extends from said point rearwardly along said edge to form a sharpened cutting edge and enables said cutting edge to split said skin in the fissure direction, whereby use of said edge produces a fissure-shaped incision, and whereby the flattened shape of said unit enables the trocar to be used with reduced risk of slippage.
Claim 2
Dependent Claim
175 words
An improved trocar for making a fissure-shaped incision in skin and bringing a tube through said skin and adjacent tissue with reduced risk of slippage in or cuts to the hands of a surgeon using said trocar, comprising: a flattened oblong unit having a front end provided with a front edge arranged at an angle to the longitudinal axis of the unit to form an oblique point, a rear end provided with means for attaching a tube thereto, and two substantially flat opposed elongate surfaces intermediate said ends to be grasped by said surgeon, said unit having a width equal to about one-half of the circumference of said tube, and said front edge provided with at least one facet that extends from said point rearwardly along said edge to form a sharpened cutting edge and enables said cutting edge to split said skin in the fissure direction, whereby use of said edge produces a fissure-shaped incision, and whereby the flattened shape of said unit enables the trocar to be used with reduced risk of slippage.
Claim 3
Dependent Claim
20 words
The trocar according to claim 1, wherein said oblong unit is bent substantially at the middle to a predetermined angle.
Claim 4
Dependent Claim
14 words
The trocar according to claim 2, wherein said predetermined angle is about twenty degrees.
Claim 5
Dependent Claim
53 words
The trocar according to claim 1 wherein said means includes an enlargement means that increases in thickness in a rearwardly direction for widening said incision in a lateral direction, thereby conforming the shape of incision substantially to that of the tube, and protecting the tube from involuntary removal during use of said trocar.
Claim 6
Dependent Claim
37 words
The trocar according to claim 4 wherein said facet extends rearwardly from said point along only about two-thirds of said front edge such that said sharpened cutting edge extends along only about two-thirds of said front edge.
Claim 7
Dependent Claim
25 words
The trocar according to claim 1 wherein said oblique point of said front edge is asymmetrically positioned far to one side of said flattened unit.
References Cited (Backward Citations)
SU161460A1
Cited
US1333745A
Cited
US1600884A
Cited
US3115138A
Cited
US3602218A
Cited
US3861393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |