Reduced Wire Profile Stent Design for Tissue Perforation Prevention
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Solution Overview
Problem
Conventional stents with rigid flanges or flares can cause tissue perforation during peristalsis, leading to painful complications and potential death due to excessive radial force on the vessel wall.
Innovation Solution
A stent design with reduced wire profiles, achieved through electropolishing or other profile reduction methods, which decreases the diameter of specific portions to reduce radial force and flexibility, thereby minimizing tissue trauma while maintaining adequate radial force for patency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If flanges or flares are made rigid to prevent stent migration, then stent stability is improved, but tissue damage occurs due to excessive radial force
Solution Approach 1:
The stent incorporates different wire profiles at different locations: a larger wire profile in the central portion for radial strength and patency maintenance, and a reduced wire profile at the ends for flexibility and reduced tissue trauma. This local differentiation allows the stent to simultaneously achieve stability through radial force while minimizing harmful effects on surrounding tissue.
Solution Approach 2:
The stent is divided into distinct segments with different structural properties: a central tube portion with larger wire profile and end portions with reduced wire profile. This segmentation allows each portion to perform its specific function - the central portion provides structural support and radial force, while the end portions provide flexibility and adaptability to tissue movement, resolving the contradiction between stability and tissue damage.
2Object-affected harmful factors
If wire diameter is reduced to decrease radial force, then tissue trauma is minimized, but stent strength is compromised
Solution Approach 1:
Different wire profiles are applied to different portions of the stent based on local requirements. The reduced wire profile at the ends minimizes tissue trauma where flexibility is needed, while the larger wire profile in the central portion maintains stent strength for patency. This localized property assignment resolves the contradiction between reducing tissue trauma and maintaining overall stent strength.
Solution Approach 2:
The wire profile parameter (diameter) is changed along the length of the stent to optimize performance. By varying the wire diameter from larger in the center to smaller at the ends, the stent achieves both sufficient strength for maintaining patency and reduced trauma to surrounding tissues, resolving the contradiction between these two requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The reduced wire profile stent design decreases the incidence of tissue perforation and hyperplasia by adapting to the tissue environment, ensuring effective vessel patency without causing damage, and can be tailored to exert appropriate radial force.
Implementation Method 1
achieved through electropolishing or other profile reduction methods
Data Source
Figure 1
Figure 1A~1D
Figure 2
AI summary
Methods and apparatuses of stents with likely reduced rates of tissue perforation are provided. Some embodiments include reducing the profile of a portion (100a, 100b) of the stent (100) using a wire profile reduction electropolishing bath and/or other wire profile reduction means.