Connection Stent with Flared Heads for Tissue Anastomosis
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Solution Overview
Problem
Conventional stents face challenges in maintaining sufficient diameter for surgical instrument passage and structural stability, with increased metallic fatigue due to external forces, leading to reduced lifespan and separation issues when connecting heterogeneous tissues.
Innovation Solution
A connection stent with a hollow cylindrical body formed by intersecting wires, featuring upper and lower heads bent at 85° to 90° angles, which form ring-shaped portions to ensure stability and prevent separation, and a manufacturing method using a jig with protruding pins to create zigzag patterns for wire intersection and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flare parts are formed to spread at an obtuse angle to maintain an inosculated state, then separation prevention is improved, but the diameter of the path becomes insufficient for surgical instrument passage
Solution Approach 1:
The stent is divided into functionally distinct segments: a body portion with a larger diameter to accommodate surgical instruments, and flare parts at the ends that spread at obtuse angles to prevent separation. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the stent have different geometric properties optimized for their specific functions. The body portion has a larger diameter for instrument passage, while the flare parts have an expanded configuration with obtuse angle spreading for separation prevention. This local differentiation resolves the contradiction between path diameter and separation prevention.
2Stability of the object's composition
If the stent structure is designed to maintain path diameter against external forces, then structural stability is improved, but metallic fatigue of wires increases reducing lifespan
Solution Approach 1:
The stent employs asymmetric wire intersection structures where wires are configured to intersect at non-uniform angles and positions. This asymmetric design distributes mechanical stresses more evenly across the wire network, reducing peak stress concentrations that would otherwise accelerate metallic fatigue while maintaining overall structural stability.
Solution Approach 2:
The flare parts are designed with curved, rounded geometries rather than sharp angles. This curvature allows for more gradual stress distribution and reduces stress concentration points on the wires, thereby reducing metallic fatigue and extending wire lifespan while maintaining the necessary structural stability.
3Reliability
If the stent is designed for anastomosis purpose with tight contact configuration, then separation prevention is improved, but the diameter sufficient for surgical instrument movement cannot be ensured
Solution Approach 1:
The stent is segmented into a body portion and end flare parts. The body portion maintains a larger diameter to accommodate surgical instruments like endoscopes, while the flare parts at the ends provide the tight contact configuration necessary for anastomosis. This segmentation resolves the contradiction between maintaining path diameter and ensuring anastomosis function.
Solution Approach 2:
Different regions of the stent have different functional properties: the body portion provides a large lumen for instrument passage, while the flare parts provide tight apposition to heterogeneous tissues for anastomosis. This local differentiation of functional qualities allows the stent to simultaneously satisfy both requirements.
Data Source
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AI summary
The present invention relates to a linking stent and to a production method for same, and the invention comprises: a main body which is provided in the shape of a hollow cylinder, and in which a plurality of cells are formed by means of intersection through wires; an upper head which is formed extending from one end of the main body, with a diameter that expands more than the diameter of the main body; and a lower head which is formed extending from the other end of the main body, with a diameter that expands more than the diameter of the main body, characterized in that the upper head and the lower head are provided so as to respectively abut inside two different types of tissue. Consequently, the present invention makes it possible to produce a stent which forms a bypass by linking between two different types of tissue, and which is able to impart minimal axial force and sufficient expansion force to maintain the bypass formed.