Self-expandable shape memory alloy stent and method for fabricating the same
First Claim
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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Accused Products
Abstract
A self-expandable shape memory alloy stent includes first and second wires made of super-elastic shape memory alloy. The first wire extends downwardly from the top to the bottom of the stent without interlocking with itself but extends upwardly from the bottom to the top of the stent while interlocking with itself to leave a multiplicity of rhombic spaces. Similarly, the second wire extends downwardly from the top to the bottom of the stent without interlocking with itself but extends upwardly from the bottom to the top of the stent while interlocking with itself, in such a manner as to divide the rhombic spaces formed by the first wire into four small rhombic spaces. 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 intersection points.
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Citations
11 Claims
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1. A method for fabricating a self-expandable shape memory alloy stent, comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A self-expandable shape memory alloy stent comprising:
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a first wire made of a super-elastic shape memory alloy, the first wire extending downwardly from a first top starting point to a first primary transition point disposed at an uppermost position of the stent, diagonally downwardly extending from the first primary transition point to a second primary transition point by a first diagonal length, diagonally upwardly extending from the second primary transition point to a third primary transition point by a second diagonal length one half time smaller than the first diagonal length, diagonally downwardly extending from the third primary transition point to a fourth primary transition point by a third diagonal length multiple times greater than the second diagonal length, diagonally upwardly extending from the fourth primary transition point to a fifth primary transition point by the second diagonal length, and then diagonally downwardly extending by the first diagonal length from the fifth primary transition point to a sixth primary transition point disposed at a lowermost position of the stent, the first wire extending in zigzag from the sixth primary transition point along a circumferential direction of the stent to form a lowermost cylindrical zigzag part, the first wire extending 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 a second wire made of a super-elastic shape memory alloy, the second wire extending downwardly from a second top starting point to a first secondary transition point disposed at an uppermost position of the stent, diagonally downwardly extending from the first secondary transition point to a second secondary transition point by a first diagonal length, diagonally upwardly extending from the second secondary transition point to a third secondary transition point by a second diagonal length one half time smaller than the first diagonal length, diagonally downwardly extending from the third secondary transition point to a fourth secondary transition point by a third diagonal length multiple times greater than the second diagonal length, diagonally upwardly extending from the fourth secondary transition point to a fifth secondary transition point by the second diagonal length, and then diagonally downwardly extending by the first diagonal length from the fifth secondary transition point to a sixth secondary transition point disposed at a lowermost position of the stent, the second wire extending in zigzag from the sixth secondary transition point along a circumferential direction of the stent to form a lowermost cylindrical zigzag part, the second wire extending 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 is arranged to intersect the first wire 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. - View Dependent Claims (7, 8, 9, 10)
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11. A self-expandable shape memory alloy stent comprising:
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a first wire made of a super-elastic shape memory alloy, the first wire extending downwardly from a first top starting point of the stent toward a bottom end of the stent without interlocking with itself to form a downward extension part, the first wire extending in zigzag from the bottom end of the stent toward a top end of the stent while forming a lowermost cylindrical zigzag part, a plurality of middle cylindrical zigzag parts and an uppermost cylindrical zigzag part, the lowermost, middle and uppermost zigzag parts of the first wire being interlocked with one another to leave a plurality of rhombic spaces therebetween; and a second wire made of a super-elastic shape memory alloy, the second wire extending downwardly from a second top starting point of the stent lying diametrically opposite from the first top starting point toward a bottom end of the stent without interlocking with itself to form a downward extension part, the second wire extending in zigzag from the bottom end of the stent to a top end of the stent while forming a lowermost cylindrical zigzag part, 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 is arranged to intersect the first wire 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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Specification