Intravascular stent and percutaneous insertion catheter system for the dilation of an arterial stenosis and the prevention of arterial restenosis
First Claim
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1. A stent insertion apparatus comprising:
- an inner core member having distal and proximal ends and a spiral groove formed on its outer surface;
a hollow outer sheath cylinder having distal and proximal ends and having an inner surface slidably mounted around said inner core member and movable relative to said inner core member from a first position covering said spiral groove of said inner core member to a second position exposing the spiral groove of said inner core member, wherein cooperation of the spiral groove of said inner core member with the inner surface of said hollow sheathing cylinder forms a spiral cavity adapted to contain a coil stent when said sheathing cylinder is in said first position; and
,a coil stent held in a radially compressed state within said spiral cavity by exerting a radial outward force on said sheathing cylinder when said sheathing cylinder is in its first position, and is released from said spiral cavity and expandable by its intrinsic mechanical properties to a larger diameter when said sheathing is in its second position without the requirement of relative axial rotation between the inner core member and the outer sheathing cylinder.
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Abstract
This invention is in the field of percutaneous insertion catheters that are used for placing a coil spring stent into a vessel of a living body for the purposes of enhancing luminal dilation, preventing arterial restenosis and preventing vessel blockage resulting from intimal dissection following balloon and other methods of angioplasty. The stent can also be used for the maintaining patency of many different ducts or vessels within a living body.
1059 Citations
6 Claims
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1. A stent insertion apparatus comprising:
- an inner core member having distal and proximal ends and a spiral groove formed on its outer surface;
a hollow outer sheath cylinder having distal and proximal ends and having an inner surface slidably mounted around said inner core member and movable relative to said inner core member from a first position covering said spiral groove of said inner core member to a second position exposing the spiral groove of said inner core member, wherein cooperation of the spiral groove of said inner core member with the inner surface of said hollow sheathing cylinder forms a spiral cavity adapted to contain a coil stent when said sheathing cylinder is in said first position; and
,a coil stent held in a radially compressed state within said spiral cavity by exerting a radial outward force on said sheathing cylinder when said sheathing cylinder is in its first position, and is released from said spiral cavity and expandable by its intrinsic mechanical properties to a larger diameter when said sheathing is in its second position without the requirement of relative axial rotation between the inner core member and the outer sheathing cylinder. - View Dependent Claims (2, 3, 4, 5, 6)
- an inner core member having distal and proximal ends and a spiral groove formed on its outer surface;
Specification