US5709671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trocar having an improved tip configuration
Assignee: Ethicon Endo Surgery Inc
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Filing: 1995-10-16
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Granted: 1998-01-20
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Expires: 2015-10-16
Abstract
Abstract A safety-shielded trocar having an obturator with a linear cutting edge surface defining a base width substantially less than the diameter of the safety shield is disclosed. When the trocar is inserted through tissue, the tissue dilates from the width of the linear incision to accommodate the size of the safety shield of the trocar, thus making it possible to provide an access opening greater than the incisional width made by the linear cutting edge surface of the obturator. In a preferred embodiment, the safety shield has a shield tip region which is asymmetric to facilitate the dilation of the tissue as the trocar is inserted.
Inventors
- 👤 Randy R. Stephens
- 👤 Steven G. Yapp
- 👤 Salvatore Privitera
- 👤 Richard F. Schwemberger
- 👤 Darrel Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3494; A61B17/3496; A61B17/3417
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
125 words
A trocar for piercing a body wall, said trocar comprising: a) an obturator having a piercing tip with first and second planar surfaces generally parallel to each other, said surfaces converging to a cutting edge surface at a first end of said surfaces, and said surfaces defining a base at an opposite end of said surfaces, said base having a base width; and b) a safety shield encasing said piercing tip, said safety shield retractable from an extended position wherein said shield encloses said cutting edge surface of said piercing tip to a retracted position wherein said cutting edge is exposed through said shield, said shield having a wall defining a shield diameter; wherein said base width is substantially less than said shield wall diameter.
Claim 2
Dependent Claim
125 words
A trocar for piercing a body wall, said trocar comprising: a) an obturator having a piercing tip with first and second planar surfaces generally parallel to each other, said surfaces converging to a cutting edge surface at a first end of said surfaces, and said surfaces defining a base at an opposite end of said surfaces, said base having a base width; and b) a safety shield encasing said piercing tip, said safety shield retractable from an extended position wherein said shield encloses said cutting edge surface of said piercing tip to a retracted position wherein said cutting edge is exposed through said shield, said shield having a wall defining a shield diameter; wherein said base width is substantially less than said shield wall diameter.
Claim 3
Dependent Claim
18 words
The trocar of claim 1 wherein said cutting edge surface is a generally triangular surface having an apex.
Claim 4
Dependent Claim
34 words
The trocar of claim 2 wherein said shield has a body region and a shield tip region extending from said body region, said body and shield tip regions intersecting at a beveled surface line.
Claim 5
Dependent Claim
22 words
The trocar of claim 3 further comprising a cannula sleeve from which said safety shield protrudes, said sleeve having a beveled tip.
Claim 6
Dependent Claim
25 words
The trocar of claim 4 wherein said beveled surface line of said safety shield is generally parallel to said beveled tip of said cannula sleeve.
Claim 7
Dependent Claim
13 words
The trocar of claim 5 wherein said body region has a circular cross-section.
Claim 8
Dependent Claim
14 words
The trocar of claim 6 wherein said shield tip region has a non-circular cross-section.
Claim 9
Dependent Claim
47 words
The trocar of claim 7 wherein said shield tip region has a distal end, and said distal end of said shield tip region has a central aperture and first and second slots thereon for receiving said cutting edge surface of said piercing tip through said safety shield.
Claim 10
Dependent Claim
24 words
The trocar of claim 8 wherein said first and second slots define a first plane parallel to said slots and intersecting said safety shield.
Claim 11
Dependent Claim
24 words
The trocar of claim 9 wherein said first and second slots define a second plane perpendicular to said slots and intersecting said safety shield.
Claim 12
Dependent Claim
30 words
The trocar of claim 10 wherein said shield tip region defines a first tip width parallel to said first plane, and a second tip width parallel to said second plane.
Claim 13
Dependent Claim
27 words
The trocar of claim 11 wherein said first tip width is substantially greater than said second tip width adjacent said distal end of said shield tip region.
Claim 14
Dependent Claim
24 words
The trocar of claim 12 wherein said cross-section of said shield tip region adjacent said distal end of said shield tip region is pear-shaped.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-19 | 2001-07-21 | 2002-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-19 | 2005-07-21 | 2006-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-19 | 2009-07-21 | 2010-01-20 | $7700.00 | Window Closed / Lapsed |