Nerve Conduit with Expanded End Portions for Insertion
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Solution Overview
Problem
Current nerve conduits face challenges in facilitating the proper insertion and fixation of nerve ends due to their dimensional limitations and continuous cylindrical shape, which can lead to nerve damage and improper adhesive application, resulting in suboptimal repair of nerve lesions.
Innovation Solution
A nerve conduit design with an elongate body featuring a central portion and end portions with a larger cross-sectional area than the inner cavity, allowing for easier nerve end insertion and adhesive application, while maintaining structural stability and guiding neurogenesis, and incorporating features like grooves and surface irregularities to enhance mechanical properties and nerve growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous cylindrical shape is used for the nerve conduit, then structural stability is maintained, but insertion of nerve ends becomes difficult and may cause nerve damage
Solution Approach 1:
The nerve conduit is divided into a first portion with a first cross-sectional area and a second portion with a second cross-sectional area. The first portion has a larger opening area to facilitate nerve end insertion, while the second portion has a smaller area to maintain structural stability and guide neurogenesis. This segmentation allows the conduit to serve multiple functions in different regions.
Solution Approach 2:
Different portions of the nerve conduit are given different geometric properties. The first portion has a larger cross-sectional area optimized for insertion ease, while the second portion has a smaller cross-sectional area optimized for structural support and guiding nerve growth. Each local region is optimized for its specific function.
2Ease of operation
If the opening cross-sectional area is increased to facilitate nerve end insertion, then ease of insertion is improved, but structural stability of the conduit is reduced
Solution Approach 1:
The conduit is segmented into two portions with different cross-sectional areas. The first portion has a larger opening for easy insertion, while the second portion maintains a smaller area for structural stability. This segmentation resolves the contradiction by distributing different functional requirements to different regions of the same structure.
Solution Approach 2:
The first portion is designed with larger cross-sectional area properties optimized for insertion, while the second portion is designed with smaller cross-sectional area properties optimized for structural stability. Each local region has quality tailored to its specific functional requirement.
3Ease of operation
If a larger opening area is provided, then adhesive application is facilitated, but adhesive may leak into the inner lumen causing harmful effects
Solution Approach 1:
The conduit is divided into a first portion for adhesive application and a second portion for protecting against leakage. The first portion's larger area facilitates adhesive application, while the second portion's smaller area acts as a barrier to prevent adhesive from entering the inner lumen, thus protecting the nerve tissue.
Solution Approach 2:
The first portion has geometric properties optimized for adhesive application accessibility, while the second portion has geometric properties that restrict adhesive flow into the lumen. Each region's local quality addresses the specific operational requirement or protection need of that region.
Data Source
AI summary
Nerve conduits support the repair of nerve lesions by facilitating proper insertion and/or fixation of nerve ends into the nerve conduit. A nerve conduit includes an elongate body with a central portion defining an inner cavity and end portions defining a respective opening to the inner cavity and arranged adjacent to the central portion and at longitudinally opposing ends of the elongate body. A cross-sectional area of at least one opening is larger than the cross-sectional area of the inner cavity of the central portion. A use and a method of treating a nerve lesion using such nerve conduits is also disclosed.