Bifurcation Stent with Chamfered End and Pivotable Sections
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Solution Overview
Problem
Stents with two sections used at bifurcations of hollow organs often project into the lumen, leading to deposition and clogging, such as in blood vessels, due to conventional design, which can result in kinking and reduced support effectiveness.
Innovation Solution
A stent design featuring a chamfered first central end that adapts to the shape of bifurcations, allowing it to support the hollow organ without projecting into the lumen, combined with pivotable stent sections and a connection system that maintains radial placement force, preventing kinking and deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stent with two stent sections is used at bifurcations, then the stent can support both branches of the hollow organ, but parts of the stent project into the lumen causing deposits and clogging
Solution Approach 1:
The first central end of the first stent section is chamfered at an angle between 10° and 60° relative to the longitudinal axis, creating an asymmetric geometry that allows the stent to adapt to slanted bifurcations without projecting into the lumen. This asymmetric chamfered design enables the stent to follow the contour of the bifurcation while maintaining support functionality.
2Strength
If the stent sections are made rigid to provide high radial placement force, then kinking is prevented, but the stent cannot adapt to slanted bifurcations
Solution Approach 1:
The coupling section is designed to be pivotable, allowing the stent sections to rotate relative to each other about the coupling section. This dynamic capability enables the rigid stent sections to adapt to slanted bifurcations by pivoting into the appropriate orientation, while maintaining high radial placement force through their rigid construction.
3Object-generated harmful factors
If the first central end is chamfered to reduce projection into lumen, then clogging is suppressed, but the structural integrity at the end may be reduced
Solution Approach 1:
The chamfer is applied locally only to the first central end of the first stent section, while the rest of the stent structure maintains its full structural integrity. This localized modification allows the end to adapt to the bifurcation geometry without compromising the overall strength of the stent structure.
Data Source
AI summary
Disclosed is a stent for transluminal implantation in hollow organs, particularly in blood vessels, the ureter, the esophagus, the colon, the duodenum or bile ducts. The stent comprises a first section comprising a substantially tubular first body which extends along a first longitudinal axis and comprises a first lateral end and a first central end; a second section comprising a substantially tubular second body which extends along a second longitudinal axis and comprises a second lateral end and a second central end, wherein the first and second stent sections are connected to each other in the region of the central ends by means of a coupling section, the stent comprising a plurality of cells which are defined by bordering elements formed by the tubular bodies, and wherein the first central end of the first stent section is embodied in a sloping manner.