Patent US5224952A successfully refreshed from Google Patents.
US5224952A
Expired / Lapsed
US
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Safety trocar
Assignee: Ethicon Inc
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Filing: 1992-10-20
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Granted: 1993-07-06
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Expires: 2012-10-20
Abstract
Abstract A safety trocar is provided which includes a spring-loaded shield that shields the cutting tip of the obturator after the obturator penetrates tissue. The distal end of the shield is hemispheric in profile and contains a slot which conforms to the geometry of the cutting tip. The rounded distal end enables the shield to spring forward to shield the cutting tip as soon as the tip perforates the tissue. A valve is located at the proximal end of the trocar tube to seal the end of the tube. The valve is oriented at an acute angle with respect to the longitudinal axis of the trocar tube. The valve is controllable by an external lever which will hold the valve open or permit it to spring shut. An incremental advancement mechanism cooperates with the obturator to permit only incremental advance of the obturator. Instead of using a discrete shield component the shielding function may be provided by spring-loading the trocar tube itself to spring forward and shield the obturator tip after the tip penetrates tissue.
Inventors
- 👤 Jose C. Deniega
- 👤 Stephen J. Failla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:28
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: 8
Claim 1
Independent Claim
171 words
A trocar comprising: a first or obturator handle containing an obturator with a sharpened tip; a second or cannula handle having a proximal end and a distal end comprising: a hollow cannula with a longitudinal path defining a longitudinal axis at said handle distal end, and a tubular chamber aligned with said longitudinal axis located at said handle proximal end, said chamber having a proximal end and a distal end oriented at an angle to said longitudinal axis, and said obturator insertable into said second handle through said chamber, such that said obturator may be guided into said cannula, said chamber having a first sealing member located at its distal end, and said cannula handle further comprising a valve located at the distal end of said chamber, said valve including an annular member, said cannula member oriented in a plane which is angularly displaced from said longitudinal axis, and said annular member attached to spring means, said spring means urging said annular member in sealing engagement with said first sealing member.
Claim 2
Dependent Claim
171 words
A trocar comprising: a first or obturator handle containing an obturator with a sharpened tip; a second or cannula handle having a proximal end and a distal end comprising: a hollow cannula with a longitudinal path defining a longitudinal axis at said handle distal end, and a tubular chamber aligned with said longitudinal axis located at said handle proximal end, said chamber having a proximal end and a distal end oriented at an angle to said longitudinal axis, and said obturator insertable into said second handle through said chamber, such that said obturator may be guided into said cannula, said chamber having a first sealing member located at its distal end, and said cannula handle further comprising a valve located at the distal end of said chamber, said valve including an annular member, said cannula member oriented in a plane which is angularly displaced from said longitudinal axis, and said annular member attached to spring means, said spring means urging said annular member in sealing engagement with said first sealing member.
Claim 3
Dependent Claim
17 words
The trocar of claim 1, wherein said annular member is a flap hingedly mounted to said chamber.
Claim 4
Dependent Claim
22 words
The trocar of claim 1 containing a second sealing member comprising a gasket located on the proximal end of said tubular chamber.
Claim 5
Dependent Claim
43 words
The trocar of claim 1, further comprising a lever located outside said chamber and connected to said annular member, said lever having a first position for maintaining said valve in a open condition, and a second position for allowing said valve to close.
Claim 6
Dependent Claim
10 words
The trocar of claim 1 wherein said angle is acute.
Claim 7
Dependent Claim
21 words
The trocar of claim 1 wherein said second handle further comprises an open area between said cannula and said tubular chamber.
Claim 8
Dependent Claim
26 words
The trocar of claim 3 wherein said annular member further comprises a sealing pad capable of being placed in mating relationship with said first sealing member.
References Cited (Backward Citations)
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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) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |