Trocar having an improved cutting tip configuration
First Claim
1. A surgical trocar comprising:
- a) a proximal handle;
b) a distal cutting tip; and
c) a central shaft extending from said proximal handle to said distal cutting tip, whereinsaid distal cutting tip has a longitudinal axis and a plurality of fins arranged about said longitudinal axis, each of said plurality of fins having first and second non-intersecting sides which are substantially parallel to each other and a distal bevel defining a cutting edge, said first side lying in a plane which substantially includes said longitudinal axis and said cutting edge.
1 Assignment
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Accused Products
Abstract
A surgical trocar has three integral single beveled blades having cutting edges which, when viewed head on, resemble a Y configuration. The distal end of each blade is formed with a leading cutting edge and a single trailing edge which define a single beveled face. The blades are arranged so that their leading edges converge to form a sharp point at the distal end of the trocar with the leading cutting edges extending proximally and radially from the point. The trocar is preferably extruded with three fins which are shifted relative to the longitudinal axis of the extrusion such that at most a first side of each fin lies along a ray from the longitudinal axis of the extrusion. Alternatively, both sides are shifted to one side of the longitudinal axis. The distal end of each fin is then ground to form a single bevel with at least a portion of the cutting edge of the beveled fin lying in a plane which includes the longitudinal axis of the extrusion and being angled proximally. The fins are preferably spaced at 120° intervals from one another about the longitudinal axis of the extrusion. The extrusion is preferably stepped proximal of the cutting edges to form a descending step for stopping the distal movement of a spring biased safety shield. The fins may be ground using the same machine used to grind a pyramidal trocar tip and will result in cutting edges with half the angle of the cutting edges of the pyramidal tip.
229 Citations
32 Claims
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1. A surgical trocar comprising:
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a) a proximal handle; b) a distal cutting tip; and c) a central shaft extending from said proximal handle to said distal cutting tip, wherein said distal cutting tip has a longitudinal axis and a plurality of fins arranged about said longitudinal axis, each of said plurality of fins having first and second non-intersecting sides which are substantially parallel to each other and a distal bevel defining a cutting edge, said first side lying in a plane which substantially includes said longitudinal axis and said cutting edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a surgical trocar having a proximal handle, a central shaft with a distal end, and a distal cutting tip having a longitudinal axis, the improvement comprising:
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said distal cutting tip comprising a plurality of fins, each fin having a first side, a second side, and a distal bevel, said first and second sides being non-intersecting and substantially parallel to each other, and said first side and said distal bevel defining a cutting edge, said first side and said cutting edge lying in a plane which substantially includes the longitudinal axis of said cutting tip. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A surgical trocar comprising:
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a) a proximal handle; b) a distal cutting tip having a longitudinal axis and a plurality of fins arranged about said longitudinal axis, with each of said plurality of fins having first and second non-intersecting sides and a distal bevel defining a cutting edge; and c) a central shaft extending from said proximal handle to said distal cutting tip, wherein said first and second sides of each of said fins lie in planes which do not include said longitudinal axis, and a portion of each said cutting edge lies in a plane which substantially includes said longitudinal axis while another portion of said cutting edge lies in a plane which does not include said longitudinal axis. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A surgical trocar comprising:
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a) a proximal handle; b) a distal cutting tip having a longitudinal axis and a plurality of fins arranged about said longitudinal axis; and c) a central shaft extending from said proximal handle to said distal cutting tip, wherein each of said plurality of fins has first and second non-intersecting sides which are substantially parallel to each other and a distal bevel defining a cutting edge having an angle substantially less than 68°
. - View Dependent Claims (31, 32)
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Specification