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METHOD FOR MANUFACTURING A STENT HAVING SUPERIOR BENDING CHARACTERISTICS, AND STENT MANUFACTURED THEREBY

  • US 20130282105A1
  • Filed: 01/10/2012
  • Published: 10/24/2013
  • Est. Priority Date: 01/14/2011
  • Status: Active Grant
First Claim
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1. A method of manufacturing a stent having a superior bending characteristic, in which a basic jig is used in which projecting pins are assembled at all transition points at which circumference dividing lines (a1, a2, a3, . . . , a13) and length dividing lines (b1, b2, b3, . . . , b17) set by equally dividing a circumference (W) and length (L) of a cylinder having the same diameter (Ø

  • ) and length (L) as the stent to be manufactured cross one another, any one of the circumference dividing lines (a1, a2, a3, . . . , a13) of the basic jig is set as an arbitrary reference point (a1), and a wire is bent via the projecting pin of each transition point, travels from an upper portion to a lower portion while being joined crosswise, and forms predetermined cells, the method comprising;

    (a) a downward wire bending process of moving a strand of wire from the reference point (a1) at a four-segment diagonal distance (4 l) in a downward direction, bending and moving the wire at a one-segment diagonal distance (1 l) at an acute angle and a two-segment diagonal distance (2 l) at an obtuse angle from the transition point in a zigzag pattern, forming acute angle bending vertexes and obtuse angle bending vertexes, and repeating this process to move the wire at a predetermined distance in the downward direction;

    (b) a lower head forming process of bending and moving the wire from the transition point located in the downward wire bending process at the one-segment diagonal distance (1 l) at the acute angle again, bending and moving the wire at a four-segment diagonal distance (4 l) at an obtuse angle in a zigzag pattern, and repeating this process to form sexangular bending finishing ends so as to form a lower head having rhombic cells (C1);

    (c) an upward wire bending process of bending and moving the wire from the transition point located in the lower head forming process at the one-segment diagonal distance (1 l) at the acute angle and the two-segment diagonal distance (2 l) at the obtuse angle in the zigzag pattern, forming the acute angle bending vertexes and the obtuse angle bending vertexes, and repeating this process to move the wire at a predetermined distance in an upward direction, whereby the wire is bent and moved upward at the transition point overlapped with the transition point of the downward wire bending process in a crossed state in the upward wire bending process of the wire, thereby forming a middle body in which starry cells (C2) are repetitively formed;

    (d) an upper head forming process of bending and moving the wire from the transition point located in the upward wire bending process at the one-segment diagonal distance (1 l) at the acute angle again, bending and moving the wire at the four-segment diagonal distance (4 l) at the obtuse angle in the zigzag pattern, and repeating this process to form sexangular bending finishing ends so as to form an upper head having the rhombic cells (C1);

    (e) a finishing connecting process of bending and moving the wire from the transition point located in the upward wire bending process at the one-segment diagonal distance (1 l) at the acute angle again, positioning the wire at the two-segment diagonal distance (2 l) at the obtuse angle once, and connecting a portion overlapped with the wire bent and positioned in the downward wire bending process by welding.

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