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Self-expandable shape memory alloy stent and method for fabricating the same

  • US 20070173927A1
  • Filed: 06/26/2006
  • Published: 07/26/2007
  • Est. Priority Date: 01/26/2006
  • Status: Active Grant
First Claim
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1. A method for fabricating a self-expandable shape memory alloy stent, comprising the steps of:

  • providing a base jig including a cylinder and a plurality of radially outwardly projecting pins, the cylinder having a plurality of circumference dividing lines (a0, a1, a2, a3 . . . and a19) and a plurality of length dividing lines (b0, b1 b2, b3 . . . and b26) defined by equally dividing a circumference W and a length L of the cylinder, the circumference dividing lines intersecting the length dividing lines to form a plurality of wire transition points at their intersections, the projecting pins implanted to the cylinder at the transition points;

    fabricating a primary stent member by extending a first shape memory alloy wire downwardly from a first top starting point to a projecting pin of a first primary transition point disposed at an uppermost position of the cylinder, then diagonally downwardly from the projecting pin of the first primary transition point to a projecting pin of a second primary transition point by a first diagonal length, then diagonally upwardly from the projecting pin of the second primary transition point to a projecting pin of a third primary transition point by a second diagonal length one half time smaller than the first diagonal length, then diagonally downwardly from the projecting pin of the third primary transition point to a projecting pin of a fourth primary transition point by a third diagonal length multiple times greater than the second diagonal length, then diagonally upwardly from the projecting pin of the fourth primary transition point to a projecting pin of a fifth primary transition point by the second diagonal length, and then diagonally downwardly by the first diagonal length from the projecting pin of the fifth primary transition point to a projecting pin of a sixth primary transition point disposed at a lowermost position of the cylinder, extending the first wire in zigzag from the projecting pin of the sixth primary transition point along a circumferential direction of the cylinder to form a lowermost cylindrical zigzag part, extending the first wire upwardly from the lowermost zigzag part in such a manner as to form a plurality of middle cylindrical zigzag parts and an uppermost cylindrical zigzag part, the lowermost, middle and uppermost zigzag parts being interlocked with one another to leave a plurality of rhombic spaces therebetween; and

    fabricating a secondary stent member by extending a second shape memory alloy wire downwardly from a second top starting point to a projecting pin of a first secondary transition point disposed at an uppermost position of the cylinder, then diagonally downwardly from the projecting pin of the first secondary transition point to a projecting pin of a second secondary transition point by a first diagonal length, then diagonally upwardly from the projecting pin of the second secondary transition point to a projecting pin of a third secondary transition point by a second diagonal length one half time smaller than the first diagonal length, then diagonally downwardly from the projecting pin of the third secondary transition point to a projecting pin of a fourth secondary transition point by a third diagonal length multiple times greater than the second diagonal length, then diagonally upwardly from the projecting pin of the fourth secondary transition point to a projecting pin of a fifth secondary transition point by the second diagonal length, and then diagonally downwardly by the first diagonal length from the projecting pin of the fifth secondary transition point to a projecting pin of a sixth secondary transition point disposed at a lowermost position of the cylinder, extending the second wire in zigzag from the projecting pin of the sixth secondary transition point along a circumferential direction of the cylinder to form a lowermost cylindrical zigzag part, extending the second wire upwardly from the lowermost zigzag part in such a manner as to form a plurality of middle cylindrical zigzag parts and an uppermost cylindrical zigzag part, the lowermost, middle and uppermost zigzag parts of the second wire being interlocked with one another to leave a plurality of rhombic spaces therebetween,wherein the second wire of the secondary stent member is arranged to intersect the first wire of the primary stent member at a multiplicity of intersection points and wherein the first wire and the second wire are woven with each other in such a manner that the second wire passes alternately below and above the first wire at the intersection points.

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