3D Printed Biodegradable Implants for Spinal Cord Injury
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Solution Overview
Problem
Current polymeric scaffolds for tissue regeneration, particularly in spinal cord injuries, lack the ability to accurately mimic the irregular shape of injury sites and have low porosity, which hinders axonal growth and regeneration.
Innovation Solution
A method for creating a 3D implant scaffold using a 3D template generated from images of lesion sites, filled with a polymeric precursor solution, and then evaporated to form a scaffold with high porosity and customized geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fabrication methods are used to create polymeric scaffolds, then the manufacturing process is simple, but the scaffold cannot accurately mimic the irregular shape of injury sites and has low porosity
Solution Approach 1:
The patent applies preliminary action by creating a 3D template from MRI images of the injury site before scaffold fabrication. This template serves as a precise guide for subsequent 3D printing, ensuring the scaffold accurately replicates the irregular injury geometry without requiring complex direct fabrication methods
Solution Approach 2:
The patent changes the porosity parameter from traditional low porosity scaffolds to high porosity (>90%) by using a template-based 3D printing approach with polymeric precursors. This parameter change enables both accurate shape replication and enhanced cell growth while maintaining fabrication feasibility
2Reliability
If current polymeric scaffolds with low porosity are used, then the scaffold structure is simple to manufacture, but cell growth and axonal guidance are limited
Solution Approach 1:
The patent directly applies porous materials by designing scaffolds with porosity exceeding 90% through the template-based 3D printing method. The porous structure is created by filling the 3D template with polymeric precursor solution and removing the template, resulting in high porosity that supports cell growth and axonal guidance while maintaining manufacturing simplicity
Solution Approach 2:
The patent uses copying by creating a 3D template from MRI images that replicates the injury site geometry, then using this template to guide scaffold fabrication. This copying approach ensures anatomical accuracy without requiring complex direct manufacturing of irregular shapes
3Manufacturing precision
If traditional scaffolds are used to fill irregular injury cavities, then the scaffold material is simple, but the topographic cues are inaccurate and do not guide regenerating axons effectively
Solution Approach 1:
The patent applies preliminary action by pre-creating a 3D template from MRI images that captures the exact irregular geometry of the injury site. This template is then used to guide the 3D printing process, ensuring accurate topographic replication without requiring complex direct fabrication of irregular shapes
Solution Approach 2:
The patent changes the topographic accuracy parameter by using template-based 3D printing with polymeric precursors that precisely replicate the injury cavity geometry. This approach achieves high manufacturing precision while maintaining fabrication process feasibility through systematic material deposition
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 method produces scaffolds with porosity exceeding 90%, allowing for enhanced cell growth and axonal guidance, effectively supporting neural tissue regeneration by closely mimicking the natural extracellular matrix.
Implementation Method 1
contacting the 3D template with a solution comprising a polymeric precursor, thereby filling a space in the 3D template
Implementation Method 2
evaporating the solution, thereby obtaining an implant scaffold
Data Source
AI summary
Methods for making an implant scaffold, comprising providing a 3D template generated according to an image of a lesion site, contacting the 3D template with a solution comprising a polymeric precursor, and evaporating the solution, thereby obtaining an implant scaffold, are provided. Further, implant scaffolds, comprising a water-soluble template in the form of a 3D geometrical array and a polymeric material are provided.