Biocompatible Nerve Conduit with Hydrogel Coating for Tissue Infiltration Control
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Solution Overview
Problem
Current nerve conduits and wraps for peripheral nerve injury treatment face challenges such as poor healing due to swelling, kinking, compression, and lack of mechanical strength, along with inadequate protection against fibrous tissue infiltration, which hinders effective nerve regeneration.
Innovation Solution
Development of biocompatible and bioresorbable nerve conduits with a porous braided structure coated with a hydrogel to control fibrous tissue infiltration, featuring a polymer composition that supports axon growth and adjustable degradation rates, combined with a hydrogel coating to facilitate nutrient exchange while preventing fibrous tissue infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If nerve conduits are made porous to allow nutrient exchange, then oxygen and nutrient diffusion is improved, but fibrous tissue infiltration increases
Solution Approach 1:
The patent applies local quality by creating a hydrogel coating with specific porosity characteristics on the inner surface of the conduit, while the outer surface maintains a different structure. The hydrogel layer has controlled pore sizes that allow nutrient diffusion but block fibrous tissue infiltration, thus differentiating properties between different regions of the same conduit structure.
Solution Approach 2:
The patent uses composite materials by combining a biocompatible polymer base material with a hydrogel coating layer. The polymer provides structural integrity and mechanical strength, while the hydrogel coating provides selective permeability properties. This composite structure allows the conduit to simultaneously achieve mechanical support and controlled nutrient transport while preventing fibrous tissue infiltration.
2Duration of action of stationary object
If degradable polymers are used for nerve conduits, then the conduit breaks down after healing, but mechanical strength and structural integrity are reduced
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the chemical composition, molecular weight, and crosslinking density of the biocompatible polymer and hydrogel materials. These parameter adjustments allow optimization of both the degradation rate and mechanical strength properties, ensuring the conduit maintains adequate strength during the healing period while degrading at an appropriate rate afterward.
3Stability of the object's composition
If the conduit wall is made non-porous to prevent fibrous tissue infiltration, then structural integrity is improved, but nutrient exchange is hindered
Solution Approach 1:
The patent applies segmentation by dividing the conduit wall into distinct functional layers: an outer structural layer that provides mechanical integrity and a inner hydrogel coating layer that enables nutrient exchange while preventing fibrous tissue infiltration. This segmented structure allows each layer to perform its specific function without compromising the other.
4Shape
If braided structure is used for nerve conduits, then kink resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies flexible shells by using a braided construction with flexible polymer fibers that can bend and flex without kinking. The braided pattern creates a flexible yet structurally sound conduit that maintains its shape and prevents kinking while allowing for natural movement and deformation during implantation and healing.
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 solution enhances nerve regeneration by providing mechanical support, preventing fibrous tissue infiltration, and matching the degradation rate with the nerve healing process, leading to improved functional recovery and reduced risk of nerve damage.
Implementation Method 1
the polymer used for constructing the nerve conduit is not only biocompatible, and bioresorbable, but has been found to support axon growth through the adsorption of endogenous proteins
Implementation Method 2
the hydrogel coating material and thickness are selected to control the overall porosity such that nutrients and oxygen can diffuse through said hydrogel coating but the infiltration of fibrous tissue through the coating is prevented
Data Source
AI summary
A biocompatible nerve conduit for nerve re-generation, wherein a porous fiber tube is coated with a bioresorbable hydrogel, with the fibers being formed from a polymer that supports nerve regeneration by preferential adsorption of endogenous proteins and braided with pores in the range from 5 to 200 micrometers using a kink-resistant braiding pattern and the hydro gel coating material and thickness being selected to control the overall porosity, so that nutrients and oxygen can diffuse through said hydrogel coating but the infiltration of fibrous tissue through the coating is prevented.