Method of stenting with minimal diameter guided delivery systems
Medical devices and methods for delivery or implantation of prostheses within hollow body organs and vessels or other luminal anatomy are disclosed. The subject technologies may be used in the treatment of atherosclerosis in stenting procedures or be used in a variety of other procedures.
1. A method for stenting a body passageway, the method comprising:
locating a distal end of a first guidewire at a site within the body passageway;
feeding a delivery catheter over the first guidewire, said delivery catheter having a catheter body including a lumen, a compressed superelastic stent slidably compressed in the lumen, and means to maintain at least a far end of the stent in an open configuration when the stent is compressed and in said lumen and prior to insertion of the first guidewire in the stent while feeding the delivery catheter over the first guidewire; said means comprising a mandrel extending through at least a portion of the stent;
pushing the mandrel from the lumen of the delivery catheter body by feeding the delivery catheter over the first guidewire; and
deploying the stent by withdrawing the catheter body while the stent position is maintained by a blocker.
2. The method of claim 1 , wherein the site is within a coronary artery selected from the group of small diagonals, PDA, and OM vessels.
3. The method of claim 2 , wherein a diameter at the site is between about 2 mm and about 3 mm.
4. The method of claim 1 , wherein the guidewire has a crossing profile of about 0.014 inches in diameter.
5. The method of claim 1 , wherein the delivery catheter includes an angioplasty balloon and an inflation lumen, the method further comprising dilatating the balloon.
6. The method of claim 1 , wherein the mandrel extends through the length of the catheter body.
7. The method of claim 1 , wherein the mandrel is a second guidewire.
8. The method of claim 1 , wherein the mandrel comprises an extension wire including a distal end adapted to dock with the first guidewire.
9. The method of claim 1 , wherein the blocker comprises an end of an elongate member actuatable from a proximal end of the delivery catheter.
10. The method of claim 9 , wherein the elongate member is tubular and the guidewire remains in the delivery guide lumen during stent delivery.
11. The method of claim 1 , wherein the delivery catheter is fed in an over-the wire fashion.
12. The method of claim 1 , wherein the guidewire has a crossing profile of about 0.010 inches in diameter.
13. The method of claim 1 , wherein said superelastic stent directly contacts the guidewire and is slidable thereover.