Temporary vascular scaffold and scoring device
Devices and methods for treating a target site in a body lumen are provided. A medical device includes a stent-like structure including a plurality of scoring and non-scoring filaments interwoven with one another. Generally, the stent-like structure will have more non-scoring filaments than scoring filaments to provide greater structural support and to focus the scoring forces on only a few select areas. The stent-like structure is expanded within the target site to score the target site and to provide temporary structural support while the target site is infused with a therapeutic agent. Such therapeutic agent infusion occurs with the use of a drug eluting or drug coated balloon disposed within the stent-like structure or by occluding the target site and introducing a drug into the occluded target site to sit for a period of time.
1. A medical device for treating a target site in a body lumen, the medical device comprising:
a stent-like structure comprising a plurality of scoring filaments and a plurality of scoring filaments and a plurality of non-scoring filaments interwoven with one another such that the plurality of scoring filaments cross over and under the plurality of non-scoring filaments, each scoring filament and non-scoring filament extending continuously over a full length of the stent-like structure,
wherein the stent-like structure comprises more non-scoring filaments crossing over and under scoring filaments than scoring filaments cross over and under non-scoring filaments,
wherein each scoring filament has a shape providing a scoring element,
wherein the plurality of non-scoring filaments are configured to radially support the body lumen after the stent-like structure has been expanded therein, and
wherein the shape of each scoring filament provides a plurality of notches, each notch receiving an individual non-scoring filament as the non-scoring filament crosses over the scoring filament.
2. The medical device of claim 1 , wherein the stent-like structure comprises a tubular mesh braid.
3. The medical device of claim 1 , wherein the stent-like structure has an expanded configuration and a collapsed configuration, and wherein the stent-like structure in the expanded configuration is collapsible into the collapsed configuration.
4. The medical device of claim 3 , wherein the stent-like structure in the expandable configuration is collapsible into the collapsed configuration by axially shortening the stent-like structure.
5. The medical device of claim 1 , wherein one or more of the plurality of scoring filaments or the plurality of non-scoring filaments are non-axial.
6. The medical device of claim 5 , wherein one or more of the plurality of scoring filaments or the plurality of non-scoring filaments are helically wound over a longitudinal axis of the stent-like structure.
7. The medical device of claim 6 , wherein one or more of the plurality of scoring filaments or the plurality of non-scoring filaments are helically wound in the same direction.
8. The medical device of claim 5 , wherein the plurality of scoring filaments are helically wound over a longitudinal axis of the stent-like structure.
9. The medical device of claim 8 , wherein the plurality of scoring filaments are helically wound in the same direction.
10. The medical device of claim 1 , wherein a cross-section of each scoring filament has one or more of a pointed, triangular, or rectangular shape.
11. The medical device of claim 1 , wherein a cross-section of each non-scoring filament has one or more of a flat, rounded, rectangular, or cylindrical shape.
12. The medical device of claim 1 , further comprising an expandable element, wherein the stent-like structure is disposed over the expandable element, and wherein the expandable element is expandable to urge the stent-like structure radially outward against an inner wall of the body lumen.
13. The medical device of claim 12 , wherein the expandable element comprises an inflatable balloon.
14. The medical device of claim 12 , wherein the expandable element is independently collapsible from the stent-like structure.
15. The medical device of claim 12 , wherein the expandable element comprises an outer surface coated with a therapeutic agent or substance.
16. The medical device of claim 12 , wherein the expandable element comprises one or more pores for releasing a therapeutic agent or substance.
17. The medical device of claim 12 , further comprising a catheter shaft, wherein the expandable element is disposed over the catheter shaft.
18. The medical device of claim 17 , further comprising an expandable proximal occluder disposed over the catheter shaft proximal of the expandable element and the stent-like structure.
19. The medical device of claim 17 , further comprising an expandable distal occluder.
20. The medical device of claim 19 , wherein the distal occluder is advancable through an inner lumen of the catheter shaft to be positioned distal of the expandable element and the stent-like structure.
21. The medical device of claim 19 , wherein the distal occluder is non-inflatable.
22. The medical device of claim 1 , wherein the full length of the stent-like structure extends from a proximal end of the stent-like structure to a distal end of the stent-like structure.
23. The medical device of claim 1 , wherein the full length of an individual scoring filament extends from a proximal end of the stent-like structure to a distal end of the stent-like structure.
24. A medical device for treating a target site in a body lumen, the medical device comprising:
a stent-like structure comprising a plurality of scoring filaments and a plurality of non-scoring filaments interwoven with one another, each scoring filament and non-scoring filament extending continuously over a full length of the stent-like structure,
wherein each scoring filament has a shape providing a scoring element, and
wherein the shape of each scoring filament provides a plurality of notches, each notch defined by an indentation in the scoring element, and each individual non-scoring filament being received in and slidable over a corresponding individual notch as the stent-like structure expands or contracts.
25. The medical device of claim 24 , wherein the stent-like structure comprises a tubular mesh braid.
26. The medical device of claim 24 , wherein the plurality of non-scoring filaments are configured to radially support the body lumen after the stent-like structure has been expanded therein.
27. The medical device of claim 24 , wherein the stent-like structure has an expanded configuration and a collapsed configuration, and wherein the stent-like structure in the expanded configuration is collapsible into the collapsed configuration.
28. The medical device of claim 27 , wherein the stent-like structure in the expandable configuration is collapsible into the collapsed configuration by axially shortening the stent-like structure.
29. The medical device of claim 24 , wherein one or more of the plurality of scoring filaments or the plurality of non-scoring filaments are non-axial.
30. The medical device of claim 29 , wherein one or more of the plurality of scoring filaments or the plurality of non-scoring filaments are helically wound over a longitudinal axis of the stent-like structure.
31. The medical device of claim 30 , wherein one or more of the plurality of scoring filaments or the plurality of non-scoring filaments are helically wound in the same direction.
32. The medical device of claim 24 , wherein a cross-section of each scoring filament has one or more of a pointed, triangular, or rectangular shape.
33. The medical device of claim 24 , wherein a cross-section of each non-scoring filament has one or more of a flat, rounded, rectangular, or cylindrical shape.
34. The medical device of claim 24 , further comprising an expandable element, wherein the stent-like structure is disposed over the expandable element, and wherein the expandable element is expandable to urge the stent-like structure radially outward against an inner wall of the body lumen.
35. The medical device of claim 24 , wherein the plurality of scoring filaments and the plurality of non-scoring filaments are interwoven with one another such that the plurality of scoring filaments cross over and under the plurality of non-scoring filaments.