EP0350291B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved safety trocar
Assignee: Ethicon Inc
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Filing: 1989-07-05
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Granted: 1994-09-14
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Expires: 2009-07-05
Abstract
No abstract record available.
Inventors
- 👤 Jose C. Deniega
- 👤 Stephen Failla
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 04:26
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3494; A61B17/3496; A61B90/00; A61B90/08; A61B2090/0801; A61B2090/08021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A trocar including a trocar tube (10) having a proximal (14) and a distal (12) end, an obturator (24) having a perforating tip (28) and extendable through the tube (10) to perforate tissue at the distal end (12) of the tube (10), said perforating tip (28) having a three-sided pyramidal shape, and containing three cutting edges, and further including a safety shield (32) extendable to shield the tip (28) of the obturator (24), said safety shield (32) exhibiting a rounded distal end (34) with a slot (36) for passage of said obturator tip (28) therethrough, characterized in that said slot (36) is bounded by three distally extending semicircular lobes (134a, b, c) formed on the distal end of said shield (32), such that the proximal ends of said lobes (134a, b, c) oppose each other on either side of said cutting edges while said obturator tip (28) is extended through said slot (36), and said slot (36) generally conforming to the geometry of said obturator tip (28) such that each of said semicircular lobes (134a, b, c) fits against said obturator tip (28) while entering the perforation created by the tip (28) to spread the perforation.
Claim 2
Dependent Claim
15 words
The trocar of claim 1, wherein said rounded distal end (34) is hemispherical in profile.
Claim 3
Dependent Claim
44 words
The trocar of claim 1 or claim 2, wherein each of said lobes (134a, b, c) includes an inner surface (136a, b, c) which contacts a face of said pyramidal obturator tip (28) when said tip (28) is fully extended through said slot (36).
Claim 4
Dependent Claim
25 words
The trocar of any one of claims 1-3, wherein said slot (36) extends radially to the outermost radial cutting edge of said obturator tip (28).
Claim 5
Dependent Claim
95 words
The trocar of any preceding claim, further comprising: a housing (16) located at the proximal end of said trocar tube (10); and resilient means (18) located at the proximal end (14) of said trocar tube (10) and permitting said trocar tube (10) to retract proximally to allow said obturator tip (28) to extend distal to the distal end (12) of said trocar tube (10) when force is exerted against said distal end (12) of said trocar tube (10), and enabling said trocar tube (10) to extend in a distal direction when said force is removed.
Claim 6
Dependent Claim
48 words
The trocar of claim 5, wherein said resilient means (18) comprises a spring (18), said trocar tube (10) includes a proximal flange (14), said housing (16) includes an abutment surface (19), and said spring (18) is mounted for compression between said flange (14) and said abutment surface (19).
References Cited (Backward Citations)
No citation records indexed.
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