Endovascular stent with locking ring
First Claim
1. A prosthetic device for implantation in a body cavity of a living body, comprising:
- a braided stent formed from a first plurality of resiliently-deformable wires helically wound in a first direction and a second plurality of resiliently-deformable wires helically wound in a second direction opposite said first direction and crossing said first wires, said stent having a first cylindrical body portion with said first and second wires crossing at a base pitch angle, and a first substantially cylindrical end portion where said first and second wires cross at a first end portion pitch angle, wherein,said first end portion pitch angle is substantially greater than said base pitch angle producing greater radial force than that of said body portion.
1 Assignment
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Accused Products
Abstract
A tubular stent is provided with a braided structure having a body portion and an end portion, where the end portion has a higher pitch angle than the body portion, thereby forming a locking ring. If desired, a second locking ring can be provided at a second end portion of the stent. The locking rings may each include an elevated locus of wires which forms a barb. The barb provides additional strength and sharpness to the locking ring when used to anchor the graft within a blood vessel. The stent is preferably coated or lined with a porous bio-compatible material to allow tissue ingrowth. A preferred method of manufacture comprises inserting a braid into a tube having a smaller diameter than the braid, with one or both of the end portions of the braid extending outside the tube, and precipitation hardening the braid in this configuration in order to form a stent having a body portion with a first pitch angle and one or two locking ring portions with a larger pitch angle.
904 Citations
24 Claims
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1. A prosthetic device for implantation in a body cavity of a living body, comprising:
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a braided stent formed from a first plurality of resiliently-deformable wires helically wound in a first direction and a second plurality of resiliently-deformable wires helically wound in a second direction opposite said first direction and crossing said first wires, said stent having a first cylindrical body portion with said first and second wires crossing at a base pitch angle, and a first substantially cylindrical end portion where said first and second wires cross at a first end portion pitch angle, wherein, said first end portion pitch angle is substantially greater than said base pitch angle producing greater radial force than that of said body portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification