Trocar
First Claim
Patent Images
1. A trocar for placement in the lumen of a cannula to facilitate insertion of the cannula through tissue defining a body cavity, the cannula having a distal end,said trocar comprising:
- a handle,an elongate obturator extending from said handle and defining a longitudinal axis, said obturator comprising cutting surfaces for cutting the tissue defining the body cavity,a trigger having portions adapted to project beyond the distal end of the cannula, said trigger having a plurality of tissue cams, each tissue cam comprising an inner surface and an outer, substantially planar surface situated at an angle relative to said longitudinal axis, and a distal end portion that is arcuate about an axis normal to the outer surface,wherein each of said distal end portions has a distal most point,said distal end portions of said tissue cams intersect at edge portions, andsaid distal most points of said distal end portions are spaced distally from said edge portions.
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Abstract
A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through tissue is disclosed. The trocar has an improved trigger/obturator assembly wherein the trigger comprises tissue cam parts each having (a) planar outer surfaces, and (b) an arcuate end portion at the distal end of the trigger including a distal edge surface that is arcuate about an axis normal to the outer surfaces. The arcuate end portions intersect at edge surfaces which are obscured by the arcuate end portions.
105 Citations
17 Claims
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1. A trocar for placement in the lumen of a cannula to facilitate insertion of the cannula through tissue defining a body cavity, the cannula having a distal end,
said trocar comprising: -
a handle, an elongate obturator extending from said handle and defining a longitudinal axis, said obturator comprising cutting surfaces for cutting the tissue defining the body cavity, a trigger having portions adapted to project beyond the distal end of the cannula, said trigger having a plurality of tissue cams, each tissue cam comprising an inner surface and an outer, substantially planar surface situated at an angle relative to said longitudinal axis, and a distal end portion that is arcuate about an axis normal to the outer surface, wherein each of said distal end portions has a distal most point, said distal end portions of said tissue cams intersect at edge portions, and said distal most points of said distal end portions are spaced distally from said edge portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A trocar for placement in the lumen of a cannula to facilitate insertion of the cannula through tissue defining a cavity, the cannula having a distal end,
said trocar comprising: -
a handle, an elongate obturator extending from said handle and defining a longitudinal axis, said obturator comprising cutting surfaces for cutting the tissue defining the body cavity, a protective sleeve having portions adapted to project beyond the distal end of the cannula, said protective sleeve having a plurality of tissue cams, each tissue cam comprising an inner surface and an outer, substantially planar surface situated at an angle relative to said longitudinal axis, and a distal end portion that is arcuate about an axis normal to the outer surface, wherein each of said distal end portions has a distal most point, said distal end portions of said tissue cams intersect at edge portions, and said distal most points of said distal end portions are spaced distally from said edge portions. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A trocar for placement in the lumen of a cannula to facilitate insertion of the cannula through tissue defining a body cavity, the cannula having a distal end,
said trocar comprising: -
a handle, an elongate obturator extending from said handle and defining a longitudinal axis, said obturator comprising cutting surfaces for cutting the tissue defining the body cavity, a protective sleeve having portions adapted to project beyond the distal end of the cannula, said protective sleeve having a plurality of tissue cams, each tissue cam comprising an inner surface and an outer, substantially planar surface situated at an angle relative to said longitudinal axis, and a distal end portion, and wherein each of said distal end portions has a distal most point, said distal end portions of said tissue cams intersect at edge portions, said distal most points of said distal end portions are spaced distally from said edge portions, and each of said distal end portions are arcuate about an axis normal to the outer surface.
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Specification