Temporary vascular scaffold and scoring device

Abstract

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.

What is claimed is: 
     
         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 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 crossing over and under non-scoring filaments,   wherein each scoring filament has a shape providing a scoring element, and   wherein the plurality of non-scoring filaments are configured to radially support the body lumen after the stent-like structure has been expanded therein.   
     
     
         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 1 , wherein a cross-section of each scoring filament has one or more of a pointed, triangular, or rectangular shape. 
     
     
         9 . 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. 
     
     
         10 . 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. 
     
     
         11 . The medical device of  claim 10 , wherein the expandable element comprises an inflatable balloon. 
     
     
         12 . The medical device of  claim 10 , wherein the expandable element is independently collapsible from the stent-like structure. 
     
     
         13 . The medical device of  claim 10 , wherein the expandable element comprises an outer surface coated with a therapeutic agent or substance. 
     
     
         14 . The medical device of  claim 10 , wherein the expandable element comprises one or more pores for releasing a therapeutic agent or substance. 
     
     
         15 . The medical device of  claim 10 , further comprising a catheter shaft, wherein the expandable element is disposed over the catheter shaft. 
     
     
         16 . The medical device of  claim 15 , further comprising an expandable proximal occluder disposed over the catheter shaft proximal of the expandable element and the stent-like structure. 
     
     
         17 . The medical device of  claim 16 , further comprising an expandable distal occluder. 
     
     
         18 . The medical device of  claim 17 , 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. 
     
     
         19 . The medical device of  claim 18 , wherein the distal occluder is non-inflatable.