Stent with self-expanding end sections
AssigneeCordis Corporation
InventorsSean Salmon, Dieter Stockel, Robert E. Fischell, Tim A. Fischell, David R. Fischell
Life of this patent
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Abstract
The present invention is a hybrid stent that is defined as having a central section that is balloon expandable and end sections that are self-expanding. The entire stent is mounted on a balloon of a balloon angioplasty catheter. One way to retain the self-expanding portion of the stent onto a balloon onto which it has been nested is to place a cylindrical elastomer tube around each of the self-expanding end sections of the stent. Another way to retain the hybrid stent onto a stent delivery system is to use a conventional sheath that is pulled back to initiate stent deployment
Claims44
A system for maintaining the patency of a vessel of the human body, the system comprising:
- a flexible guide wire;
- a balloon angioplasty catheter having a lumen through which the guide wire can be slideably moved and also having a distal section where an inflatable balloon is located, the balloon having a length L4 of its cylindrical central section when the balloon is inflated to a pressure of approximately 10 atmospheres;
- and,
- a pre-deployed hybrid stent mounted onto the balloon of the balloon angioplasty catheter, the stent having a deployed length L5 wherein, L5>L4, the stent also having a central section that is balloon expandable and end sections that are self-expanding.
A method for placing a self-expanding stent within a stenosis of a vessel of a human body, the method comprising the following steps:
- a) mounting a hybrid stent having self-expanding end sections onto a balloon located at a distal section of a balloon angioplasty catheter, the self-expanding end sections being formed from a shape-memory metal having a transition temperature that is less than 37 degrees Centigrade, the stent having a length L5 that is greater than the length L4 of the cylindrical central section of the balloon when inflated to a pressure of 10 atmospheres;
- b) inserting the stent mounted onto the balloon angioplasty catheter into a stenosis within a vessel of the human body;
- c) injecting contrast medium into the balloon to a pressure of at least 6 atmospheres;
- d) deflating the balloon;
- and
- e) removing the balloon angioplasty catheter from the human body.
A system for maintaining the patency of a vessel of the human body, the system comprising:
- a flexible guide wire;
- a balloon angioplasty catheter having a lumen through which the guide wire can be slideably moved and also having a distal section where an inflatable balloon is located, the balloon having a length L4 of its cylindrical central section when the balloon is inflated to a pressure of approximately 10 atmospheres;
- and,
- a pre-deployed, hybrid metal stent crimped onto the inflatable balloon, the stent having a deployed length L5 and also having end sections formed from a shape memory metal having a transition temperature above which it seeks its preset state which is the state when the stent has its nominal deployed diameter, the transition temperature being less than 37 degrees Centigrade.
A system for maintaining the patency of a vessel of the human body, the system comprising:
- a flexible guide wire;
- a balloon angioplasty catheter having a lumen through which the guide wire can be slideably moved and also having a distal section where an inflatable balloon is located,
- a pre-deployed, hybrid metal stent placed onto the inflatable balloon, the stent having end sections formed from a shape-memory metal having a transition temperature above which it seeks its preset state which is the state when the stent has its nominal deployed diameter, the transition temperature being less than 37 degrees Centigrade, the stent also having a central section that is balloon expandable at the temperature of a human body.
A hybrid stent for placement within a vessel of a human body, the stent having end sections that are self-expanding and a central section that is formed from a conventional metal and has a stent design that is balloon expandable and not self-expanding.
A hybrid stent adapted for implantation into a vessel of a human body, the hybrid stent being formed from two pieces, the first piece being a self-expanding stent having a central section and two end sections, and a second piece being a balloon expandable stent that is shorter in length than the self-expanding stent, the self-expanding stent extending for the entire length of the hybrid stent, the second piece being co-axially placed at the center of the self-expanding stent, the balloon expandable stent being adapted to constrain expansion of the central section of the self-expanding stent.
Dependencies are inferred from the claim text.