Biodegradable Composite Implants with Aligned Filaments
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Solution Overview
Problem
Conventional materials for orthopedic implants face challenges such as brittle failure, lack of rigidity, and inadequate biodegradability, which hinder their ability to provide both mechanical strength and gradual degradation necessary for effective bone healing and absorption.
Innovation Solution
Development of composite materials comprising coated fibers with aligned inorganic filaments and a polymeric coating, which are designed to offer high mechanical properties, ductility, and controlled degradation, allowing for the creation of implants that can withstand normal physical activity and gradually absorb into the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid materials are used to provide load-bearing capacity, then mechanical strength is improved, but brittle failure occurs
Solution Approach 1:
The patent employs composite materials consisting of biodegradable polymer matrix combined with reinforcing fillers (such as glass fibers, carbon fibers, or natural fibers) to create a material that exhibits both high mechanical strength and ductile failure characteristics. The composite structure allows the material to achieve the required load-bearing capacity while maintaining energy absorption capabilities during failure, resolving the contradiction between strength and reliable failure mode.
2Reliability
If biodegradable materials are used to enable gradual absorption, then bioabsorbability is improved, but rigidity and load-bearing capacity are reduced
Solution Approach 1:
The patent creates composite materials where biodegradable polymer matrices are reinforced with high-strength fillers to maintain rigidity and load-bearing capacity while preserving bioabsorbability. The composite structure enables the material to provide mechanical support during the healing process and then gradually degrade and be absorbed by the body, resolving the contradiction between bioabsorbability and structural rigidity.
Solution Approach 2:
The patent modifies the degradation rate parameters of the biodegradable polymer matrix through compositional adjustments, allowing the material to maintain structural integrity for the required healing duration and then gradually degrade. This controlled parameter change enables the material to transition from load-bearing to bioabsorbable functionality over time.
3Strength
If metal implants are used to provide high strength, then mechanical strength is improved, but invasive surgery and permanent foreign objects are required
Solution Approach 1:
The patent develops composite implant materials that achieve sufficient mechanical strength for load-bearing applications while being biodegradable and bioabsorbable. This eliminates the need for invasive removal surgery and permanent foreign objects, as the implant naturally degrades and integrates with the bone over time, resolving the contradiction between strength and ease of surgical operation.
4Reliability
If polymeric implants are used to enable bioabsorbability, then bioabsorbability is improved, but load bearing strength is reduced
Solution Approach 1:
The patent creates composite polymeric materials where the biodegradable polymer matrix is reinforced with high-strength fillers to achieve load-bearing capabilities comparable to or exceeding conventional metals. The composite structure enables the material to provide sufficient mechanical strength for implant applications while maintaining bioabsorbability, resolving the contradiction between bioabsorbability and load bearing strength.
Data Source
AI summary
Composite parts (e.g. for implants) comprising fiber bundles including a plurality of aligned inorganic filaments, which are coated or impregnated with a polymer, and a polymeric matrix. The composite is stiff and ductile and preferably biodegradable and/or bioresorbable.