Atraumatic Stent Spacer Design for Cyst Wall Protection
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Solution Overview
Problem
Existing stents used for drainage in bodily lumens, such as pancreatic fluid collections, often cause post-acute bleeding due to tissue interaction between the stent's terminal end and the cyst wall as the cyst volume reduces.
Innovation Solution
A stent design featuring a tubular body with integral atraumatic spacer members that extend beyond the end of the tubular body, preventing direct contact between the stent's end and the cyst wall, thereby reducing tissue irritation and bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a stent is used for drainage in bodily lumens, then drainage efficiency is improved, but tissue interaction and bleeding occur due to contact between the stent end and cyst wall
Solution Approach 1:
The patent introduces spacer members as intermediary elements between the stent terminal end and the cyst wall. These spacers extend beyond the stent end to create a physical barrier that prevents direct contact between the stent and tissue, thereby eliminating tissue irritation and bleeding while preserving drainage function through the stent lumen.
2Stability of the object's composition
If the stent terminal end directly contacts the cyst wall, then positioning stability is improved, but post-acute bleeding occurs due to repetitive tissue interaction
Solution Approach 1:
The spacer members serve as mediators that maintain the stent's positioning stability by providing a buffer zone between the stent terminal end and the cyst wall. This intermediary structure prevents repetitive tissue interaction and associated bleeding while allowing the stent to remain securely positioned for drainage.
3Device complexity
If the stent structure is simplified without spacer members, then device complexity is reduced, but tissue damage occurs due to direct stent-cyst wall contact
Solution Approach 1:
The patent segments the stent structure by adding separate spacer members that are distinct from the main stent body. These spacers are disposed around the stent terminal end and extend beyond it to provide protective functionality without significantly complicating the overall device design or manufacturing process.
Data Source
AI summary
A stent includes a tubular body formed of one or more interwoven wires, the tubular body having first and second opposing open ends and a lumen extending therebetween. The stent further includes a first anchor member disposed adjacent the first open end and a second anchor member disposed adjacent the second open end, the first and second anchor members each extending radially outward from the tubular body, the first and second anchor members each having an outer diameter larger than an outer diameter of the tubular body disposed between the first and second anchor members. A plurality of spacer members are disposed around the first open end and extending longitudinally beyond the first open end, wherein when a pulling force is applied to the spacer members, the outer diameter of the tubular body is not reduced.