Endovascular devices and methods
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 an intravascular device having a distal portion, inserting the device into the vascular lumen, positioning the distal portion in the vascular wall to at least partially surround the occlusion, and removing at least a portion of the surrounded occlusion from the lumen.
1. A subintimal device, comprising:
an elongate device body including a proximal shaft portion, a distal coil portion, and an enlarged distal tip;
wherein the distal coil portion is integrally formed with the proximal shaft portion;
wherein a plurality geometric projections are integrally formed with the distal coil portion and extend from a flat base surface of the distal coil portion;
wherein the flat base surface extends between adjacent geometric projections to allow the plurality of geometric projections of adjacent coil windings of the distal coil portion to mate with one another;
wherein each of the plurality geometric projections includes:
first and second opposing straight side surfaces; and
a peak;
wherein the first and second opposing straight side surfaces extend from the flat base surface of the distal coil portion to the peak while converging toward each other;
wherein the peak has a flat surface extending from the first opposing straight side surface to the second opposing straight side surface; and
wherein the flat surface of the peak extends parallel to the flat base surface of the distal coil portion.
2. The subintimal device of claim 1 , wherein the proximal shaft portion includes a tubular member.
3. The subintimal device of claim 1 , wherein the distal coil portion is a single-layer coil.
4. The subintimal device of claim 1 , wherein the flat surface of the peak is juxtaposed with the flat base surface of an adjacent coil winding.
5. The subintimal device of claim 1 , wherein the first and second opposing straight side surfaces are juxtaposed with first and second opposing straight surfaces of an adjacent coil winding.
6. The subintimal device of claim 1 , wherein an outer extent of the distal tip is greater than an outer extent of the distal coil portion and the proximal shaft portion.
7. A subintimal device, comprising:
an elongate device body having a tubular single-layer coil and an enlarged distal tip;
wherein a plurality geometric projections are integrally formed with the tubular single-layer coil and extend from a flat base surface of the tubular single-layer coil;
wherein the flat base surface extends between adjacent geometric projections to allow the plurality of geometric projections of adjacent coil windings of the tubular single-layer coil to mate with one another;
wherein each of the plurality geometric projections includes:
first and second opposing straight side surfaces; and
a peak;
wherein the first and second opposing straight side surfaces extend from the flat base surface of the tubular single-layer coil to the peak while converging toward each other;
wherein the peak has a flat surface extending from the first opposing straight side surface to the second opposing straight side surface; and
wherein the flat surface of the peak extends parallel to the flat base surface of the tubular single-layer coil.
8. The subintimal device of claim 7 , wherein the flat surface of the peak is juxtaposed with the flat base surface of an adjacent coil winding.
9. The subintimal device of claim 7 , wherein the first and second opposing straight side surfaces are juxtaposed with first and second opposing straight surfaces of an adjacent coil winding.
10. The subintimal device of claim 7 , wherein an outer extent of the distal tip is greater than an outer extent of the tubular single-layer coil.
11. The subintimal device of claim 7 , wherein the tubular single-layer coil is formed from a continuous wire.
12. The subintimal device of claim 11 , wherein the continuous wire has been mechanically deformed to form the plurality of geometric projections.
13. A subintimal device, comprising:
an elongate device body including a single-layer coil portion having a plurality of coil windings formed by laser cutting a pattern into a metallic tubular member;
wherein the pattern includes a plurality geometric projections extending from a flat base surface of the single-layer coil portion;
wherein the flat base surface extends between adjacent geometric projections to allow the plurality of geometric projections of adjacent coil windings of the plurality of coil windings to mate with one another;
wherein each of the plurality geometric projections includes:
first and second opposing straight side surfaces; and
a peak;
wherein the first and second opposing straight side surfaces extend from the flat base surface of the single-layer coil portion to the peak while converging toward each other;
wherein the peak has a flat surface extending from the first opposing straight side surface to the second opposing straight side surface;
wherein the flat surface of the peak extends parallel to the flat base surface of the single-layer coil portion; and
wherein the elongate device body includes an enlarged distal tip.
14. The subintimal device of claim 13 , wherein the single-layer coil portion resists diametric expansion or contraction under an applied torsional load.
15. The subintimal device of claim 13 , wherein the elongate device body includes an uncut proximal tubular portion extending a greater length of the elongate device body than the single-layer coil portion.
16. The subintimal device of claim 15 , wherein the uncut proximal tubular portion and the single-layer coil portion are both formed from the same metallic tubular member.
17. The subintimal device of claim 13 , wherein the flat surface of the peak is juxtaposed with the flat base surface.
18. The subintimal device of claim 13 , wherein the first and second opposing straight side surfaces are juxtaposed with first and second opposing straight surfaces of adjacent coil windings.
19. The subintimal device of claim 13 , wherein an outer extent of the enlarged distal tip is greater than an outer extent of the single-layer coil portion.
20. The subintimal device of claim 13 , wherein a width between the first and second opposing straight side surfaces, at the flat base surface of the single-layer coil portion, is greater than a width of the peak of each of the plurality geometric projections.