Bending-Resistant Nerve Catheter with Layered Polymer Structure
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Solution Overview
Problem
Current nerve catheters lack mechanical strength and bending resistance, leading to compression and distortion during joint flexion, which hampers nerve growth and can cause secondary damage, and existing solutions like autografts and allografts have limitations such as tissue adhesions and muscle atrophy.
Innovation Solution
A triple-layered nerve catheter composed of an inner layer with a smooth or oriented microchannel structure, a middle layer with fibers at crossing angles for flexibility and mechanical support, and an outer layer with randomly distributed fibers to prevent tissue infiltration, made from biodegradable polymers like PLA and collagen, designed to withstand muscle compression and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural materials such as collagen are used for nerve catheters, then biocompatibility is improved, but mechanical strength is insufficient and lumen volume reduces under muscle compression
Solution Approach 1:
The patent employs composite materials combining natural biodegradable polymers (collagen, gelatin, silk fibroin) with synthetic biodegradable polymers (PLA, PCL, PLGA) to create a nerve catheter that achieves both biocompatibility and mechanical strength. The natural polymer layers provide biocompatibility and degradation properties, while the synthetic polymer layers provide structural support and resistance to compression, resolving the contradiction between softness and mechanical strength
2Ease of operation
If the catheter is made flexible for nerve growth, then ease of implantation is improved, but bending resistance deteriorates causing compression during joint flexion
Solution Approach 1:
The nerve catheter is segmented into multiple functional layers, each with specific properties. The inner layer provides smooth surface for nerve gliding, the middle layer provides structural support with higher polymer content for bending resistance, and the outer layer provides protection. This segmentation allows the catheter to be flexible enough for implantation while maintaining bending resistance during joint flexion
Solution Approach 2:
Different layers of the catheter have different local qualities: the inner layer has high flexibility and smooth surface for nerve contact, the middle layer has enhanced mechanical strength and bending resistance, and the outer layer has protective properties. This local differentiation allows the catheter to exhibit flexibility where needed while maintaining bending resistance in structural layers
3Ease of manufacture
If the catheter structure is simplified for ease of manufacture, then manufacturing complexity is reduced, but bending resistance and nerve repair performance deteriorate
Solution Approach 1:
The patent controls the degradation rates and mechanical properties by adjusting parameters such as polymer composition ratios, layer thicknesses, and fiber diameters. The electrostatic spinning parameters (voltage, flow rate, distance) are optimized to produce fibers with specific properties that provide bending resistance while maintaining manufacturability through a standardized multi-layer fabrication process
Data Source
AI summary
Disclosed is a bending-resistant nerve catheter and a preparation method and application thereof, and relates to the technical field of tissue engineering materials. The catheter of the present application includes an inner layer, a middle layer and an outer layer, and each layer uses raw materials of biodegradable polymers; among them, the inner layer includes a smooth surface inner layer, an oriented microchannel inner layer or a fibrous inner layer, the middle layer is a fibrous middle layer with crossing angles, the middle layer is prepared by entangling micron fibers with a certain angular arrangement, and the outer layer is made of randomly entangled polymer fibers and is tightly bonded to the middle layer.