3D Crossed Polymer Composite for Bone Fixation
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Solution Overview
Problem
Conventional reinforcing methods for organic polymer materials face challenges such as lack of compatibility between materials, reduced strength due to filler dilution, and anisotropy of mechanical properties in crystalline polymer composites, particularly in medical applications where biocompatibility and osteoconductivity are essential.
Innovation Solution
A reinforced composite comprising a mixture of hetero-componential polymers with a crystalline and glass phase at room temperature, formed into micron-sized fibrous layers that are three-dimensionally crossed and entangled, enhancing toughness and flexibility while maintaining osteoconductivity and bio-absorbability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fillers are simply mixed with thermosetting resin without crosslinking or curing, then the production process is simplified, but the strength is totally lowered due to resin dilution and exfoliating at the boundary surface
Solution Approach 1:
The invention changes the chemical parameter by introducing a coupling agent that forms chemical bonds between the resin and filler surfaces. This parameter change transforms the physical mixing process into a chemically bonded composite system, resolving the contradiction between manufacturing simplicity and strength enhancement.
Solution Approach 2:
The coupling agent acts as an intermediary substance between the thermosetting resin and the filler particles. It mediates the interface interaction by forming bonding bridges, preventing resin exfoliation while maintaining production process simplicity.
2Reliability
If a large amount of fillers (more than 33.3 vol %) are mixed to exhibit chemical and physiological properties sufficiently, then the filler continuity is achieved, but certain kinds of properties are remarkably lowered due to resin dilution
Solution Approach 1:
The coupling agent serves as an intermediary that enables high filler content (above 33.3 vol %) to be incorporated while maintaining mechanical strength. It prevents the resin dilution effect by creating strong interfacial bonding, allowing filler continuity for chemical and physiological properties without sacrificing structural integrity.
Solution Approach 2:
The invention creates a composite material system where coupling agents are integrated into the resin-filler matrix. This composite approach allows the simultaneous achievement of filler continuity for bioactivity and mechanical strength through multi-phase material design.
3Strength
If non-biodegradable and non-bioabsorbable fibers (such as PEEK, carbon fiber) are used for reinforcement, then high strength is achieved, but physical stimulation harmful to living body occurs due to fiber fragments
Solution Approach 1:
The invention employs biodegradable and bioabsorbable polymer fibers instead of permanent synthetic fibers. These fibers are designed to degrade over time into harmless byproducts, providing temporary reinforcement strength during the critical healing period while eliminating long-term physical stimulation to living tissues.
Solution Approach 2:
The invention changes the chemical composition parameter of the reinforcing fibers from non-biodegradable synthetic materials to biodegradable natural or semi-synthetic polymers. This parameter change maintains reinforcement functionality while transforming the material's interaction with living tissue from harmful to beneficial.
4Strength
If crystalline polymers are forged to improve strength, then mechanical strength is enhanced, but anisotropy of mechanical properties occurs in the composite
Solution Approach 1:
The invention introduces asymmetry in the fiber arrangement by creating a three-dimensional random network structure. This asymmetric distribution of biodegradable fibers in multiple directions counterbalances the anisotropic effect of crystal orientation, achieving overall isotropic mechanical properties while maintaining enhanced strength.
Solution Approach 2:
The invention transitions from two-dimensional planar fiber reinforcement to three-dimensional spatial network reinforcement. This dimensional change distributes the reinforcing effect uniformly in all directions, compensating for the anisotropy introduced by crystal orientation during forging.
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 composite exhibits improved toughness, extensibility, and resistance to repetitive loading, allowing for precise shaping and reduced production costs, while maintaining bioactive properties suitable for medical bone fixation and joint devices.
Implementation Method 1
a polymer comprising a crystalline phase and glass phase at ordinary temperatures
Data Source
AI summary
The forging-reinforced composite constructed of a plurality of different kinds of materials, which have compatible polymers comprising crystalline and glass phases at room temperature for the matrices, is a composite, wherein, by being forged in a layer-separated state in which each of the different kinds of materials forms micron-sized fibrous layers that crossed and intermingled three-dimensionally with each other and the arrangement of the crystals in the crystalline phases configuring the matrices having a disordered orientation without anisotropy in a variety of directions, the inherent-properties of the material of each layer are complementarily reinforced. A mixed nonwoven fabric wherein microfibers are crossed and intermingled two- or three-dimensionally with each other is manufactured and heated under pressure at or above the melting point of the polymers to manufacture compact blocks wherein the microfibers are welded. Then, the compact blocks are forged at a crystallization temperature.