PLA-Collagen Scaffold Sterilization for Cartilage Repair
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Solution Overview
Problem
Current biomaterial scaffolds for cartilage repair lack desired biomechanical properties, stability, and purity, and existing methods for preparing scaffolds often lead to significant degradation of materials, which affects their performance and safety.
Innovation Solution
A method for preparing a sterilized scaffold composed of polylactide (PLA) and collagen, involving steps to load collagen onto a PLA fiber mesh, dry, and sterilize the scaffold without causing significant degradation, thereby achieving improved biomechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sterilization methods are used on PLA-collagen scaffolds, then sterility is achieved, but significant degradation of materials occurs
Solution Approach 1:
The patent applies parameter changes by modifying the temperature parameter during sterilization. Instead of using conventional high-temperature sterilization methods that cause material degradation, the patent employs low-temperature sterilization (e.g., sterile filtration, radiation sterilization, or chemical sterilization at controlled temperatures) to achieve sterility while preserving the integrity of PLA and collagen materials. This parameter optimization resolves the contradiction between achieving sterility and preventing material degradation.
2Ease of manufacture
If existing scaffold preparation methods are used, then scaffolds can be manufactured, but desired biomechanical properties and purity are not achieved
Solution Approach 1:
The patent applies preliminary action by performing specific preprocessing steps before final scaffold assembly. This includes pre-sterilizing individual components (PLA fibers, collagen solutions), pre-conditioning the fiber mesh structure, and pre-controlling the loading environment to prevent contamination. These preliminary actions ensure that the final scaffold achieves desired biomechanical properties and purity without requiring complex post-processing, thus resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The patent applies local quality by optimizing different regions and stages of the manufacturing process with specific parameters. For example, controlling collagen concentration and loading conditions in specific zones of the fiber mesh, or applying different treatment conditions to different components at different stages. This localized optimization ensures that each part of the scaffold achieves the required biomechanical properties and purity, resolving the contradiction between simple manufacturing and high manufacturing precision.
3Device complexity
If collagen is loaded onto PLA fiber mesh using conventional methods, then scaffold structure is formed, but material degradation occurs
Solution Approach 1:
The patent applies the intermediary principle by introducing controlled conditions as mediators between the collagen loading process and the final scaffold structure. This includes using buffered solutions to maintain optimal pH during collagen loading, employing cross-linking agents as intermediaries to stabilize collagen-fiber interactions without degrading materials, and controlling ionic strength and temperature during the loading process. These intermediary elements enable proper scaffold structure formation while preventing material 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 method results in a scaffold with enhanced biomechanical properties, stability, and purity, which is safe for medical use and effective in supporting tissue regeneration, particularly for cartilage repair.
Implementation Method 1
a sterilization step has unexpectedly been shown to impart certain biomechanical properties to the scaffold
Implementation Method 2
ii) Drying the PLA-collagen scaffold obtained from step i)
Data Source
AI summary
A method for preparing a sterilized scaffold for medical use, the method comprising the steps of:i) Loading collagen to a fiber mesh containing fibers of polylactide polymer or copolymer (commonly denoted PLA) to obtain a PLA-collagen scaffold,ii) Drying the PLA-collagen scaffold obtained from step i),iii) Sterilizing the PLA-collagen scaffold obtained from the drying step ii) to obtain the sterilized scaffold.The sterilized scaffold obtained has improved biomechanical properties compared with an unsterilized scaffold.