Laparoscopic cannula
First Claim
1. A cannula for extension through tissue into a cavity, said cannula comprising:
- a cylindrical sleeve defining a hollow passageway through which a surgical instrument can be directed,said sleeve having (a) a proximal end to be manipulated by a user in directing the sleeve into its operative position through body tissue into a body cavity, (b) a distal end which projects into a cavity with the sleeve in its operative position, and (c) a cylindrical outer surface;
expandable means at the distal end of the sleeve for preventing withdrawal of the sleeve from a tissue with said expandable means in an expanded state,said sleeve having a radial recess,said expandable means being collapsible from its expanded state wherein it projects radially sufficiently to prevent passage through an incision to a collapsed state in which the expandable means projects radially not significantly further than the outer surface of the sleeve so as not to prevent passage of the distal sleeve end into and out of an incision in body tissue;
means for selectively placing said expandable means in the expanded and collapsed states;
a retaining collar having a tapered surface; and
cooperating means on the sleeve and collar for permitting movement of the collar relative to the sleeve towards the sleeve distal end whereby body tissue through which the sleeve is directed can be captured between the tapered collar surface and the expandable means to thereby maintain the sleeve in its operative position.
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Accused Products
Abstract
A laparoscopic cannula is provided having a sleeve defining a hollow passageway through which a surgical instrument can be directed and having a proximal end and a distal end which projects into a cavity with the sleeve in its operative position, expandable structure at the distal end of the sleeve which is selectively expandable and collapsible and which prevents withdrawal of the sleeve in its expanded state, structure for selectively expanding and collapsing the expandable structure, a retaining collar with a tapered surface, and cooperating structure on the sleeve and collar for permitting movement of the collar relative to the sleeve towards the sleeve distal end whereby body tissue through which the sleeve is directed can be captured between the tapered collar surface and expandable structure to maintain the sleeve in its operative position.
555 Citations
21 Claims
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1. A cannula for extension through tissue into a cavity, said cannula comprising:
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a cylindrical sleeve defining a hollow passageway through which a surgical instrument can be directed, said sleeve having (a) a proximal end to be manipulated by a user in directing the sleeve into its operative position through body tissue into a body cavity, (b) a distal end which projects into a cavity with the sleeve in its operative position, and (c) a cylindrical outer surface; expandable means at the distal end of the sleeve for preventing withdrawal of the sleeve from a tissue with said expandable means in an expanded state, said sleeve having a radial recess, said expandable means being collapsible from its expanded state wherein it projects radially sufficiently to prevent passage through an incision to a collapsed state in which the expandable means projects radially not significantly further than the outer surface of the sleeve so as not to prevent passage of the distal sleeve end into and out of an incision in body tissue; means for selectively placing said expandable means in the expanded and collapsed states; a retaining collar having a tapered surface; and cooperating means on the sleeve and collar for permitting movement of the collar relative to the sleeve towards the sleeve distal end whereby body tissue through which the sleeve is directed can be captured between the tapered collar surface and the expandable means to thereby maintain the sleeve in its operative position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A cannula for extension through tissue into a cavity, said cannula comprising:
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a sleeve defining a hollow passageway through which a surgical instrument can be directed; said sleeve having (a) proximal end to be manipulated by a user in directing the sleeve into an operative position through body tissue into a body cavity and (b) a distal end which projects into a cavity with the sleeve in its operative position, said sleeve having first and second joinable parts; means on the second sleeve part for preventing withdrawal of the sleeve from body tissue through which the cannula extends, said preventing means comprises a membrane that is radially expandable from a collapsed state to an expanded state, said sleeve having a recess for reception of the membrane in its collapsed state; and means on the sleeve for cooperating with the preventing means to capture body tissue through which the sleeve extends to thereby maintain the sleeve in its operative position. - View Dependent Claims (17, 18, 19)
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20. A cannula for extension through tissue into a cavity, said cannula comprising:
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a sleeve defining a hollow passageway through which a surgical instrument can be directed, said sleeve having (a) a proximal end to be manipulated by a user in directing the sleeve into an operative position through body tissue into a cavity and (b) a distal end which projects into a cavity with the sleeve in its operative position, said sleeve having first and second joinable parts; means on the second sleeve part for preventing withdrawal of the sleeve from body tissue through which the cannula extends; and means on the sleeve for cooperating with the preventing means to capture body tissue through which the sleeve extends to thereby maintain the sleeve in its operative position, wherein the cooperating and preventing means on the sleeve comprises a slidable collar having a tapered surface for bearing against body tissue and cooperating with the preventing means on the second part to capture body tissue in conjunction therewith. - View Dependent Claims (21)
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Specification