Medical Stent with Variable Pitch Reinforcement
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Solution Overview
Problem
Existing medical stents are prone to buckling during placement in areas with strong stenosis, which can prevent effective breach of stenosis and require early replacement, and are difficult to recover due to easy crushing of their ends.
Innovation Solution
A medical stent design featuring a resin main body with a reinforcing metal wire spirally embedded between the inner and outer circumferential surfaces, including regions with varying winding pitches to enhance stability and crushability, and locking members for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stent is made with a uniform coil structure, then the stent has consistent rigidity throughout, but stress concentrates at boundaries during placement and buckling occurs
Solution Approach 1:
The stent applies local quality by varying the coil winding pitch along its length. The first region has a first winding pitch, the second region has a second winding pitch different from the first, and the third region has a third winding pitch different from both. This creates zones of different rigidity: higher rigidity in regions needing structural support and lower rigidity in regions designed for crushing and conformability during placement, thereby preventing stress concentration and buckling at boundaries.
2Ease of operation
If the stent ends are made easily crushable for recovery, then the stent can be retrieved through the channel, but the stent buckles during placement and cannot breach strong stenosis
Solution Approach 1:
The stent implements local quality by creating distinct regions with different coil winding pitches. The first region (distal end), second region (middle), and third region (proximad end) each have different winding pitches that create varying rigidity characteristics. This allows specific segments to be optimized for crushing and recovery while maintaining overall structural integrity for successful placement and stenosis breaching.
Data Source
AI summary
A medical stent including: a tubular main body made of resin that extends along an axis; a first locking member including a first fixed end fixed to the distal end side of the main body, and a first free end positioned radially outward of the main body; a second locking member including a second fixed end fixed to the proximal end side of the main body, and a second free end positioned radially outward of the main body; and a spiral reinforcing material made of metal which is embedded between the inner and outer circumferential surfaces of the main body. The reinforcing material includes a first portion spirally wound between the first and second fixed ends, a second portion spirally wound at a pitch greater than that of the first portion, and a third portion spirally wound at a pitch greater than that of the second portion.