Delivery system for bifurcation stents
Systems for aligning and deploying side branch stents comprise a catheter having a side branch sensor at or near a distal end thereof. Methods comprises rotating and axially transitioning the catheter until the sensor is brought into alignment with an opening to the side branch vessel.
1. A stent delivery system comprising:
a catheter shaft having a stent deployment region near a distal end thereof;
a single guidewire lumen in the stent deployment region;
a stent having a side portion on the stent deployment region of the shaft; and
a side branch sensor on the catheter shaft, wherein the sensor comprises a resilient radiopaque penetrating element which is attached to the catheter shaft, extends under the stent and through the side portion, such that when facing a wall of a main branch vessel, the element remains constrained by the wall of the main branch vessel and when the side portion of the stent is oriented toward an ostium of a side branch vessel, the element resiliently protrudes into the side branch vessel.
2. A stent delivery system as in claim 1 , wherein the stent deployment region comprises a balloon which carries the stent.
3. A stent delivery system as in claim 1 , wherein the single guidewire lumen extends through the balloon which carries the stent.
4. A stent delivery system as in claim 3 , wherein the width of the stent on the balloon does not exceed 1.5 mm.
5. A stent delivery system as in claim 1 , wherein the resilient radiopaque penetrating element is adapted to remain constrained within the main branch vessel and to be released into the side branch vessel when aligned with the side branch vessel ostium.
6. A stent delivery system as in claim 1 , wherein the resilient radiopaque penetrating element is composed of a super elastic or shape memory alloy.
7. A stent delivery system as in claim 1 , wherein the resilient radiopaque penetration element is composed of a resilient polymer.
8. A method for deploying a prosthesis having a side branch portion in a side branch vessel in a main branch vessel, said method comprising:
providing a catheter having a stent deployment region near a distal end thereof, the catheter carrying the prosthesis having the side branch portion on the stent deployment region, wherein the catheter comprises a single guidewire lumen in the stent deployment region;
advancing the catheter in the main branch vessel over a guidewire disposed in the single guidewire lumen, the guidewire extending through the main branch vessel until the side branch portion is proximate the side branch vessel;
rotating and/or axially positioning the catheter while observing the relative position of the side branch portion and the side branch vessel;
deploying the prosthesis after observing the alignment of the side branch portion and the side branch vessel, wherein observing comprises probing a wall of the main branch vessel with a radiopaque probe aligned with the side branch, wherein the probe is a resilient element attached to the catheter, extending under the prosthesis and through the side branch portion such that the element remains constrained within the main branch vessel when facing the wall of the main branch vessel until the element is aligned with the side branch vessel when it resiliently pops-up and enters the side branch vessel as the catheter is rotated and/or axially positioned along the guidewire in the single guidewire lumen, the guidewire extending through the main branch vessel outside of the side branch vessel.
9. A method as in claim 8 , wherein the resilient element is comprised of a super elastic or shape memory alloy.
10. A method as in claim 8 , wherein the resilient element is composed of a resilient polymer.