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US5855566A Expired / Lapsed US ⏱️ 0.0 years remaining

Trocar assembly

Assignee: Conmed Corp
•
Filing: 1995-06-01
•
Granted: 1999-01-05
•
Expires: 2015-06-01
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Abstract

Abstract A trocar for use in surgical procedures including a cannula for maintaining a sealed working channel in a body wall and an obturator which creates the working channel through the body wall while protecting patients and medical personnel from harm is disclosed. A cannula converter which can be employed with the trocar to enable a surgeon to use surgical instruments having a smaller outer diameter than the inner diameter of the cannula without deflating a body cavity is further disclosed. A site stabilizer which can be used with the trocar to prevent the cannula from being inadvertently withdrawn from the body cavity during a surgical procedure is also disclosed.

Inventors

  • 👤 David A. Dunlap
  • 👤 Douglas J. Medema
  • 👤 Hugh Melling
  • 👤 Jeffrey W. Zerfas

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 14:40
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3417; A61B17/3462; A61B17/3494; A61B17/3496; A61B17/3474; A61B2017/348; A61B2017/3482; A61B2017/349; A61B2017/3492; A61B90/00; A61B90/08; A61B2090/0807; A61B2090/0811

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 138 words
A site stabilizer for preventing inadvertent withdrawal of a trocar cannula from a body wall comprising: a stem defining a channel for receiving the trocar cannula and having external threads for engaging the body wall; a head connected to the stem, the head having a top portion and a bottom portion, the top portion and bottom portion each defining an opening aligned with the channel of the stem for receiving the trocar cannula, the bottom portion including a camming structure; a handle slidably disposed at least partially within the head and operatively engaging the camming structure; and a gripping device disposed adjacent the handle, the gripping device translating between a release position for receiving and releasing the trocar cannula and a grip position for securing and gripping the trocar cannula as the handle moves along the camming structure.
Claim 2
Dependent Claim 138 words
A site stabilizer for preventing inadvertent withdrawal of a trocar cannula from a body wall comprising: a stem defining a channel for receiving the trocar cannula and having external threads for engaging the body wall; a head connected to the stem, the head having a top portion and a bottom portion, the top portion and bottom portion each defining an opening aligned with the channel of the stem for receiving the trocar cannula, the bottom portion including a camming structure; a handle slidably disposed at least partially within the head and operatively engaging the camming structure; and a gripping device disposed adjacent the handle, the gripping device translating between a release position for receiving and releasing the trocar cannula and a grip position for securing and gripping the trocar cannula as the handle moves along the camming structure.
Claim 3
Dependent Claim 13 words
A site stabilizer as defined in claim 1 wherein the stem is cylindrical.
Claim 4
Dependent Claim 33 words
A site stabilizer as defined in claim 1 wherein the bottom portion of the head defines a recessed area aligned with the channel of the stem, the recessed area containing an O-ring seal.
Claim 5
Dependent Claim 39 words
A site stabilizer as defined in claim 1 wherein the top portion of the head includes a camming structure aligned with the camming structure of the bottom portion of the head to define bounded channels for guiding the handle.
Claim 6
Dependent Claim 19 words
A site stabilizer as defined in claim 1 wherein the camming structure comprises ramps radially disposed about the channel.
Claim 7
Dependent Claim 26 words
A site stabilizer as defined in claim 5 wherein the handle includes radially disposed projections for operatively engaging the radially disposed ramps of the camming structure.
Claim 8
Dependent Claim 110 words
A site stabilizer as defined in claim 1 wherein the gripping device further comprises an annular ring having a plurality of radially disposed inwardly directed projections, the inwardly directed projections being translatable from a first position wherein the projections are disposed at a first angle from the annular ring to define a first inner diameter for receiving the trocar cannula when the gripping device is in the release position and a second position wherein the projections are disposed at a second angle to define a second inner diameter which is smaller than the first inner diameter for gripping the trocar cannula when the gripping device is in the grip position.

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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) 2002-01-04 2002-07-06 2003-01-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2006-01-04 2006-07-06 2007-01-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2010-01-04 2010-07-06 2011-01-05 $7700.00 Window Closed / Lapsed

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