Endovascular devices and methods for exploiting intramural space
Devices and methods for the treatment of chronic total occlusions are provided. One disclosed embodiment comprises a method of facilitating treatment via a vascular wall defining a vascular lumen containing an occlusion therein. The method includes providing a first intravascular device having a distal portion with a concave side, inserting the first device into the vascular lumen, positioning the distal portion in the vascular wall, and orienting the concave side of the distal portion toward the vascular lumen.
1. A method of facilitating vascular treatment via a vascular wall defining a vascular lumen having an occlusion disposed therein, the method comprising:
providing an intravascular device having a distal intramural portion;
inserting the intramural portion into the vascular lumen;
passing the intramural portion from the vascular lumen into the vascular wall proximal of the occlusion;
moving the intramural portion within the vascular wall in a longitudinal direction;
moving the intramural portion within the vascular wall in a circumferential direction such that the intramural portion has a concave side facing the vascular lumen;
providing a re-entry device having a tissue penetrating tip;
orienting the tip as a function of the concave side of the intramural portion such that the tip is pointed toward the vascular lumen;
causing the tip to penetrate tissue to pass from within the vascular wall to within the vascular lumen; and
passing the intramural portion from the vascular wall into the vascular lumen distal of the occlusion such that the intravascular device extends from the vascular lumen proximal of the occlusion, transmurally adjacent the occlusion, to the vascular lumen distal of the occlusion.
2. The method of claim 1 , wherein the intramural portion of the intravascular device includes an deployable element.
3. The method of claim 2 , wherein the deployable element is expandable from a collapsed configuration to a deployed configuration.
4. The method of claim 3 , wherein the deployable element is constrained within an actuatable sheath while in the collapsed configuration.
5. The method of claim 4 , wherein the actuatable sheath is retracted from the deployable element to permit the deployable element to expand to the deployed configuration.
6. The method of claim 2 , further comprising:
expanding the deployable element in first and second opposite directions in the vascular wall.
7. The method of claim 2 , wherein the deployable element is an expandable lattice structure.
8. The method of claim 7 , wherein the expandable lattice structure is formed of nickel titanium.
9. The method of claim 1 , further comprising:
retracting a sheath proximally relative to the intramural portion after passing the intramural portion from the vascular lumen into the vascular wall proximal of the occlusion.
10. The method of claim 9 , further comprising:
expanding a deployable element on the intramural portion in the vascular wall upon retracting the sheath proximally.
11. The method of claim 10 , wherein the deployable element is expanded in first and second opposite directions in the vascular wall.