Rotating balloon expandable sheath bifurcation delivery
View Patent ↗A medical device comprises a balloon catheter shaft having a catheter balloon. An outer balloon or sheath is disposed about the catheter balloon and is freely rotatable about the catheter balloon.
1. A medical device comprising:
a balloon catheter shaft having a catheter balloon, the catheter balloon having a length, a sheath disposed about the catheter balloon, the sheath being substantially freely rotatable about the catheter balloon, no portion of the sheath being more than about 5 centimeters proximal to a most proximal portion of the balloon;
a stent having a side opening defined in a sidewall of the stent between proximal and distal ends of the stent, the stent extending around at least a portion of the sheath; and
a guidewire extending through a portion of the sheath and the stent side opening.
2. The medical device of claim 1 , wherein the balloon catheter shaft defines a first guide wire lumen, and the sheath at least partially defines a second guide wire lumen.
3. The medical device of claim 2 , wherein the guidewire extends through the second guidewire lumen.
4. The medical device of claim 3 , wherein the stent is constructed and arranged for use in a bifurcation.
5. The medical device of claim 3 , wherein the stent is at least partially self-expanding.
6. The medical device of claim 3 , wherein the stent is at least partially constructed of a shape memory material.
7. The medical device of claim 2 , wherein a rotating collar is positioned about the second wire lumen and the balloon catheter shaft.
8. The medical device of claim 7 , wherein a first longitudinal lock is positioned about the second wire lumen and proximal to the rotating collar, and a second longitudinal lock is positioned about the balloon catheter shaft and distal to the rotating collar such that the longitudinal position of the sheath and collar is maintained.
9. The medical device of claim 1 , wherein the sheath is at least partially constructed of a shape memory material.
10. The medical device of claim 1 , wherein the sheath is constructed of at least one homogeneous layer.
11. The medical device of claim 10 , wherein the sheath comprises an inner surface, at least a portion of the inner surface having a lower frictional interface than an adjacent portion.
12. The medical device of claim 10 , wherein the sheath is constructed with a soft durometer polymer.
13. The medical device of claim 10 , wherein the sheath is constructed of a polymer with a durometer hardness of less than about 55D.
14. The medical device of claim 1 , wherein the sheath is at least partially constructed of multiple layers.
15. The medical device of claim 14 , wherein at least one of the layers is constructed of a first material having different properties from a second material found in at least one other layer.
16. The medical device of claim 14 , wherein an inner layer of the sheath is in contact with the balloon, the inner layer constructed of at least one low friction material.
17. The medical device of claim 16 , the low friction material is selected from the group consisting of PTFE, HDPE, or any combination thereof.
18. The medical device of claim 14 , wherein there is an outer layer of a soft durometer polymer suitable for securing a stent to the sheath.
19. The medical device of claim 1 , wherein the sheath has an expanded state when the balloon is in an expanded condition and an unexpanded state when the balloon is in an unexpanded condition.
20. The medical device of claim 19 , wherein the sheath rotates substantially freely about the balloon when the sheath is in both the unexpanded state and the expanded state.
21. The medical device of claim 1 , further comprising at least one safety tether.
22. The medical device of claim 21 , wherein the at least one safety tether is a pullwire, the pullwire being positioned external of at least one of the guide wire lumens.
23. The medical device of claim 21 , wherein the at least one safety tether is a pullwire, the pullwire being disposed in at least one of the guide wire lumens.
24. The medical device of claim 1 wherein the length of the sheath is no greater than 2 centimeters longer than the length of the balloon.
25. A catheter assembly, comprising:
a main catheter shaft;
a balloon positioned at a distal end of the main catheter shaft;
a sheath extending around at least a portion of the balloon, the sheath being rotatable relative to the balloon; and
a tether member coupled to the sheath for axial positioning of the sheath relative to the balloon, the tether member extending proximally from the sheath.
26. The catheter assembly of claim 25 , wherein the tether is a pullwire.
27. The catheter assembly of claim 25 , further comprising a stent extending around at least a portion of the sheath, the stent including at least one side opening defined in a sidewall of the stent between proximal and distal ends of the stent.
28. The catheter assembly of claim 27 , further comprising a first guidewire lumen extending through the balloon, and a second guidewire lumen extending between the balloon and the stent.
29. The catheter assembly of claim 28 further comprising a first guidewire that extends through the first guidewire lumen, and a second guidewire that extends through the second guidewire lumen and the at least one side opening of the stent.
30. The catheter assembly of claim 27 , wherein the tether member is positioned within at least one of the first and second guidewire lumens.
31. The catheter assembly of claim 25 , wherein the tether member is connected directly to the sheath.