Process for coupling an angioplasty stent to a corresponding insertion element, and kit thus formed
View Patent ↗A process for setting an angioplasty stent on a corresponding insertion element, such as a delivery catheter, in which the angioplasty stent is subjected to an action of radial contraction. The stent is in a radially contracted state before being placed on the insertion element. Preferably, radial contraction of the stent results in a diameter at least marginally smaller than the diameter of the insertion element, e.g., a balloon catheter. After the stent has been set on the insertion element, in the structure of the stent there remain residual states of constraint which act in the direction of securing the stent in the condition of coupling to the insertion element.
1. A method of loading a stent on a delivery catheter, the delivery catheter having a proximal end and a distal end, the method comprising:
providing a stent having a length, at least a portion of the length of the stent being in a radially contracted position, the stent capable of being dilated from the radially contracted position to a radially expanded position, the stent having a first diameter in the radially contracted position and a second diameter in the radially expanded position, the second diameter being greater than the first diameter; providing the delivery catheter the delivery catheter having a third diameter, the first diameter being smaller than the third diameter;
providing a conical sheath disposed about the proximal end of the delivery catheter;
sliding the stent in the radially contracted position over and past the conical sheath onto the delivery catheter.
2. The method of claim 1 , wherein the first diameter is smaller than the third diameter by at least 5%.
3. The method of claim 1 , wherein the first diameter is smaller than the third diameter by at least 25%.
4. A method of loading a stent on a delivery catheter, the delivery catheter having a proximal end and a distal end, the method comprising:
providing a stent having a length, at least a portion of the length of the stent being in a radially contracted position, the stent capable of being dilated from the radially contracted position to a radially expanded position, the stent having a first diameter in the radially contracted position and a second diameter in the radially expanded position, the second diameter being greater than the first diameter;
providing the delivery catheter;
providing a conical sheath disposed about the distal end of the delivery catheter;
sliding the stent in the radially contracted position over the conical sheath onto the delivery catheter such that the stent is expanded to a delivery position, the stent in the delivery position having a delivery diameter, the delivery diameter being greater than the first diameter and less than the second diameter.
5. The method of claim 4 , wherein the step of providing the conical sheath comprises providing the conical sheath formed from a material having a low coefficient of friction.
6. The method of claim 4 , wherein the step of providing the conical sheath comprises providing the conical sheath formed from a flexible material.
7. The method of claim 4 , wherein the step of providing the conical sheath comprises providing the conical sheath formed from polytetrafluoroethylene.
8. The method of claim 4 , further comprising the step of removing the conical sheath after the stent has been mounted on the delivery catheter.
9. The method of claim 4 wherein, in the step of providing the delivery catheter, the delivery catheter has a third diameter, the first diameter and delivery diameter being smaller than the third diameter.
10. The method of claim 9 , wherein the first diameter is smaller than the third diameter by at least 5%.
11. The method of claim 9 , wherein the first diameter is smaller than the third diameter by at least 25%.
12. The method of claim 9 , wherein, in the step of mounting the stent in the radially contracted position onto the delivery catheter, radial contraction of the delivery catheter occurs.
13. A method of loading a stent on a delivery catheter, the delivery catheter having a proximal end and a distal end, the method comprising:
providing a stent having a length, at least a portion of the length of the stent being in a radially contracted position, the stent capable of being dilated from the radially contracted position to a radially expanded position, the stent having a first diameter in the radially contracted position and a second diameter in the radially expanded position, the second diameter being greater than the first diameter;
providing the delivery catheter;
providing a conical sheath disposed about the proximal end of the delivery catheter;
sliding the stent in the radially contracted position over and past the conical sheath onto the delivery catheter, the stent being maintained in a stationary position while moving the delivery catheter, and wherein radial contraction of the delivery catheter occurs.