Chitosan Nerve Guide for Regeneration Without Donor Surgery
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Solution Overview
Problem
Current methods for treating peripheral nerve injuries, such as autografts and synthetic nerve guides, face challenges including the need for additional surgeries, size mismatches, and complications like fibrosis and chronic nerve compression.
Innovation Solution
A method for manufacturing a chitosan tubular member using a biodegradable sheet that is wrapped around a mandrel and then formed into a tubular shape, which can be used as a nerve guide to support nerve regeneration without the need for harsh chemical treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If donor nerve from patient (autograft) is used to bridge severed nerve ends, then nerve regeneration is supported, but additional surgery is required and function is lost at donor site
Solution Approach 1:
The patent employs a biodegradable chitosan nerve guide that serves as a temporary structure to support nerve regeneration. This disposable device eliminates the need for donor nerve harvesting, as it degrades naturally after fulfilling its guiding function during the regeneration process, thereby avoiding additional surgery and donor site morbidity.
Solution Approach 2:
The patent utilizes chitosan's可调 degradation rate parameter to match the nerve regeneration timeline. By controlling the degradation rate, the nerve guide maintains structural integrity long enough to support regeneration but ultimately disappears without requiring surgical removal, resolving the contradiction between providing reliable support and avoiding additional surgery.
2Reliability
If donor nerve from cadaver (allograft) is used, then size mismatch occurs due to normal variation between individuals
Solution Approach 1:
The patent employs chitosan's可调 degradation rate and mechanical properties parameters to create a nerve guide that can be customized to match the specific size and regeneration requirements of each patient. This eliminates size mismatch issues associated with allografts, as the device can be tailored to the exact dimensions needed while providing reliable regeneration support.
3Length of moving object
If synthetic nerve guides are used, then bridging distances greater than 5 mm is limited, but long-term complications such as fibrosis and chronic nerve compression occur
Solution Approach 1:
The patent utilizes chitosan's biodegradability parameter to create a nerve guide that maintains structural integrity for extended bridging distances but gradually degrades after supporting regeneration. This eliminates long-term complications like fibrosis and chronic compression, as the device naturally disappears after fulfilling its function, while still enabling bridging of distances greater than 5 mm during the regeneration process.
4Duration of action of stationary object
If biodegradable nerve guides are used, then mechanical strength is rapidly lost due to fast degradation, but collapse of conduits and nerve compression risk occur
Solution Approach 1:
The patent employs chitosan's可调 degradation rate parameter to optimize the balance between mechanical strength and degradation time. By controlling this parameter, the nerve guide maintains sufficient mechanical strength to prevent collapse during the critical early regeneration period while gradually degrading at a rate that matches tissue regeneration, avoiding both premature failure and long-term compression.
Solution Approach 2:
The patent may utilize composite chitosan structures or cross-linking to enhance mechanical strength while maintaining biodegradability. This allows the nerve guide to provide adequate structural support during the regeneration process without sacrificing the ability to degrade at a controlled rate, resolving the contradiction between maintaining strength and allowing degradation.
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 chitosan tubular member provides a biocompatible and biodegradable solution for nerve repair, supporting nerve regeneration while avoiding complications associated with existing methods, and can be tailored to dissolve within specific time frames to accommodate clinical requirements.
Implementation Method 1
a method for manufacturing a chitosan tubular member using a biodegradable sheet that is wrapped around a mandrel and then formed into a tubular shape
Data Source
AI summary
Provided is a medical device formed entirely from or formed partially from a polymer, e.g., a polysaccharide such as chitosan. In some embodiments, the medical device may be formed as a tubular member formed from a sheet of a chitosan material. This chitosan tube may be used to wrap around tissue, such as a nerve or tendon to help with the regeneration or healing process of the nerve or tendon, as applicable.