| 摘要 |
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. |
