Degradable Implant Composites for Load-Bearing Ductile Failure
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Solution Overview
Problem
Conventional materials for medical implants face challenges in balancing load-bearing capacity, biodegradability, and failure mode, with many exhibiting brittle failure or requiring invasive surgeries for removal, while biodegradable materials lack the necessary rigidity and strength for load-bearing applications.
Innovation Solution
A composite material comprising a degradable polymeric matrix with dispersed fibers and fillers, designed to maintain mechanical strength and degrade in a controlled manner, ensuring ductile failure and promoting tissue ingrowth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid materials are used to achieve load-bearing capacity, then strength is improved, but brittle failure occurs
Solution Approach 1:
The patent employs composite materials consisting of a degradable polymer matrix combined with reinforcement fibers (such as polyethylene terephthalate, polypropylene, or natural fibers) to achieve both load-bearing capacity and ductile failure. The fiber reinforcement prevents brittle failure while maintaining the degradable nature of the composite structure.
Solution Approach 2:
The patent modifies the mechanical properties and degradation rate parameters of the polymer matrix through composition selection and processing conditions. By adjusting parameters such as polymer molecular weight, crystallinity, and fiber-to-matrix ratio, the material achieves optimal balance between strength, ductility, and controlled degradation.
2Duration of action of stationary object
If biodegradable materials are used to achieve material degradation, then biodegradability is improved, but rigidity is reduced
Solution Approach 1:
The patent uses composite construction where degradable polymer matrices are reinforced with high-strength fibers to maintain rigidity while preserving biodegradability. The fiber network provides structural support that compensates for the reduced rigidity of pure biodegradable polymers.
Solution Approach 2:
The composite structure segments the load-bearing function across multiple fibers distributed within the polymer matrix, allowing the material to maintain structural integrity during degradation while preserving the biodegradable characteristics of the matrix material.
3Strength
If conventional materials are used to achieve load-bearing capacity, then strength is improved, but invasive removal is required
Solution Approach 1:
The patent employs degradable composite materials designed to be temporarily implanted and then automatically degraded and absorbed by the body. This eliminates the need for invasive removal surgery, as the material safely degrades in place after serving its load-bearing function during tissue healing.
Solution Approach 2:
The degradable composite material serves itself by automatically degrading and being absorbed by the body's biological processes. The material performs its structural function and then self-destructs through controlled degradation, eliminating the need for external intervention or surgical removal.
4Duration of action of stationary object
If biodegradable materials are used to achieve controlled degradation, then biodegradability is improved, but mechanical strength is reduced
Solution Approach 1:
The patent combines degradable polymer matrices with reinforcement fibers to create a composite that maintains mechanical strength throughout the useful life. The fiber reinforcement ensures that even as the polymer degrades, the composite structure retains sufficient strength to fulfill its structural function.
Solution Approach 2:
The composite structure is designed with pre-established fiber networks and matrix compositions that ensure adequate mechanical strength from the outset. The fiber reinforcement is built-in during manufacturing to maintain strength throughout the material's service life and degradation period.
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 material provides enhanced mechanical properties, ductile failure mode, and controlled degradation, supporting load-bearing functions without invasive removal, promoting tissue healing and integration.
Implementation Method 1
a degradable polymeric matrix material... configured to be degradable according to a predetermined degradation profile
Data Source
AI summary
An elongated composite for an implant comprising: one or more composite elements includes a core region including a plurality of fibrous bundles, (which are preferably braided, woven, bound, interlaced and/or interlocked by bias fiber elements) wherein the core region of the composite elements includes a polymerizable material or polymeric material which fills gaps between the fibrous bundles, (preferably wherein the each of the one or more composite elements has a second region including a polymeric covering formed of a polymerizable material or a polymeric material); and a covering over the one or more composite elements, preferably wherein the covering provides one or more functional features to the composite.