Adjustable length cannula and trocar
First Claim
1. An adjustable length cannula for insertion through a body cavity wall, the adjustable length cannula having a distal end adapted for insertion through a body cavity wall and an oppositely disposed proximal end, the adjustable length cannula, comprising:
- a body member, said body member having a surface adapted for abutting a patient'"'"'s skin;
a cannula member telescopically disposed with respect to the body member;
wherein the body member and the cannula member define an interengaging adjustment structure that allows an overall longitudinal length of the adjustable length cannula to be changed; and
wherein at least a portion of said adjustment structure lie distal to said surface.
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Accused Products
Abstract
An adjustable length cannula which may be longitudinally extended or retracted in order to accommodate a range of body cavity wall thicknesses. The cannula includes an annular flange which abuts the skin surface to provide lateral stability to the inserted cannula and to prevent the associated trocar from being inserted too far into the body cavity. A low external profile of the cannula further contributes to its lateral stability. An adjustable length trocar for use with one embodiment of the adjustable length cannula is also disclosed.
429 Citations
24 Claims
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1. An adjustable length cannula for insertion through a body cavity wall, the adjustable length cannula having a distal end adapted for insertion through a body cavity wall and an oppositely disposed proximal end, the adjustable length cannula, comprising:
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a body member, said body member having a surface adapted for abutting a patient'"'"'s skin; a cannula member telescopically disposed with respect to the body member; wherein the body member and the cannula member define an interengaging adjustment structure that allows an overall longitudinal length of the adjustable length cannula to be changed; and wherein at least a portion of said adjustment structure lie distal to said surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An adjustable length cannula for insertion through a body cavity wall, comprising:
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a body member; a cannula member telescopically disposed with respect to the body member; a clamp member adjustably engaged with the body member and including an annular flange; wherein the annular flange abuts a skin surface when the adjustable length cannula is inserted through the body cavity wall; wherein the telescopic disposition of the body member and the cannula member allows an overall longitudinal length of the adjustable length cannula to be changed; an adjustable length trocar extending through the body member and the cannula member; wherein the adjustable length trocar further comprises; a longitudinal shaft; a handle at a proximal end of the shaft; a pointed tip at a distal end of the shaft; an upper trocar housing rotatably coupled to the longitudinal shaft and having third incremental spacing members thereon; and a lower trocar housing engaged with a proximal end of the body member and having fourth incremental spacing members thereon, the third and fourth incremental spacing members being interengaged in order to allow the shaft to telescope within the body member and the cannula member.
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15. An adjustable length cannula for insertion through a body cavity wall, comprising:
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a body member; a cannula member telescopically disposed with respect to the body member; a clamp member adjustably engaged with the body member and including an annular flange; wherein the annular flange abuts a skin surface when the adjustable length cannula is inserted through the body cavity wall; wherein the telescopic disposition of the body member and the cannula member allows an overall longitudinal length of the adjustable length cannula to be changed; an adjustable length trocar extending through the body member and the cannula member; wherein the adjustable length trocar further comprises; a longitudinal shaft; a handle at a proximal end of the shaft; a pointed tip at a distal end of the shaft, wherein the pointed tip has a threaded surface; an upper trocar housing rotatably coupled to the longitudinal shaft and having third incremental spacing members thereon; and a lower trocar housing engaged with a proximal end of the body member and having fourth incremental spacing members thereon, the third and fourth incremental spacing members being interengaged in order to allow the shaft to telescope within the body member and the cannula member.
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16. An adjustable length cannula for insertion through a body cavity wall, comprising:
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a body member; a cannula member telescopically disposed with respect to the body member; wherein the telescopic disposition of the body member and the cannula member allows an overall longitudinal length of the adjustable length cannula to be changed; wherein at least a portion of the telescopically disposed portions of the cannula member and the body member lie below a skin surface when the adjustable length cannula is inserted through the body cavity wall; at least one notch formed in the cannula member; and a trocar having at least one extension operable to engage the at least one cannula member notch and to impart a torquing force to the cannula member when the trocar is rotated, wherein the trocar includes a threaded distal end.
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17. An adjustable length cannula for insertion through a body cavity wall, said adjustable length cannula having a distal end adapted for insertion through a body cavity wall and an oppositely disposed proximal end, said adjustable length cannula comprising:
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a body member; a cannula member telescopically disposed with respect to the body member; a clamp member adjustably engaged with the body member and including a flange; wherein the flange abuts a skin surface when the distal end of the adjustable length cannula is inserted through a body cavity wall; wherein the body member and the cannula member interengage to form a longitudinal adjuster that allows an overall longitudinal length of the adjustable length cannula to be changed; and wherein at least a portion of the longitudinal adjuster lie distal to the flange. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification