Needle having optimum grind for reduced insertion force
First Claim
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1. An introducer needle for penetrating a membrane, the needle comprising:
- a solid body portion having a central axis; and
a solid tip portion extending from the solid body portion, the solid tip portion comprising;
a common insertion point that is coincident with the central axis;
a plurality of wedge surfaces extending from the solid body portion and converging toward the common insertion point, each wedge surface forming an intersection with an adjacent wedge surface; and
a plurality of cutting edges formed at the intersections of the wedge surfaces, the cutting edges converging toward the common insertion point;
wherein insertion of the introducer needle into the membrane causes even cutting and separation of the membrane around the introducer needle.
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Accused Products
Abstract
An introducer needle for an infusion set or the like includes a solid tip portion with a plurality of intersecting wedge surfaces that converge toward a common insertion point. Preferably, the common insertion point is coincident with a central axis of the introducer needle. The tip portion also includes a plurality of cutting edges formed at intersections of the wedge surfaces. The cutting edges converge toward the common insertion point so that insertion of the introducer needle into the membrane causes even cutting and separation of the membrane around the introducer needle.
119 Citations
24 Claims
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1. An introducer needle for penetrating a membrane, the needle comprising:
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a solid body portion having a central axis; and
a solid tip portion extending from the solid body portion, the solid tip portion comprising;
a common insertion point that is coincident with the central axis;
a plurality of wedge surfaces extending from the solid body portion and converging toward the common insertion point, each wedge surface forming an intersection with an adjacent wedge surface; and
a plurality of cutting edges formed at the intersections of the wedge surfaces, the cutting edges converging toward the common insertion point;
wherein insertion of the introducer needle into the membrane causes even cutting and separation of the membrane around the introducer needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An infusion set comprising:
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a cannula housing;
a cannula extending from the cannula housing; and
an introducer needle extending through at least a portion of the cannula, the introducer needle comprising;
a solid body portion having a central axis;
a solid tip portion extending from the solid body portion, the solid tip portion comprising;
a common insertion point that is coincident with the central axis;
a plurality of wedge surfaces extending from the solid body portion and converging toward the common insertion point, each wedge surface forming an intersection with an adjacent wedge surface; and
a plurality of cutting edges formed at the intersections of the wedge surfaces, the cutting edges converging toward the common insertion point;
wherein insertion of the introducer needle into the membrane causes even cutting and separation of the membrane around the introducer needle. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification