Resorbable Composite Bone Implant with Phase Transition
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Solution Overview
Problem
Current osteosynthesis devices face challenges in ease of implantation, mechanical properties, and biological acceptance, particularly in treating fragility fractures and metaphyseal fractures, with a need for improved handling and recovery times.
Innovation Solution
A biocompatible, resorbable composite comprising osteoconductive particles like beta-tricalcium phosphate dispersed in a porous polycaprolactone matrix, which transitions between a pliable and rigid state without chemical reactions, allowing for flexible implantation and integration with bone tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the composite is made rigid to provide structural support, then mechanical strength is improved, but ease of implantation deteriorates
Solution Approach 1:
The composite undergoes a temperature-dependent parameter change, transitioning from a pliable state at elevated temperatures (enabling easy implantation and shaping) to a rigid state at body temperature (providing structural support). This parameter change resolves the contradiction by allowing the material to exhibit different mechanical properties at different stages of the implantation process.
Solution Approach 2:
The composite exhibits dynamic mechanical behavior, being pliable during implantation and rigid during function. This dynamic property allows the material to adapt its state based on the operational requirements, providing ease of handling when needed and structural support when required.
2Reliability
If the composite is made fully resorbable to improve biological acceptance, then biological acceptance is improved, but mechanical strength deteriorates
Solution Approach 1:
The composite combines resorbable polymer matrix (providing biocompatibility and resorbability) with dispersed inorganic particles (providing mechanical strength and osteoconductivity). This composite structure allows both materials to contribute their advantageous properties, resolving the contradiction between biological acceptance and mechanical strength.
Solution Approach 2:
Different regions of the composite have different properties: the polymer matrix provides biocompatibility and resorbability, while the inorganic particles provide mechanical strength and osteoconductivity. This local differentiation of properties allows the composite to simultaneously achieve both biological acceptance and adequate mechanical strength.
3Ease of operation
If the composite is made pliable for ease of implantation, then ease of implantation is improved, but mechanical strength deteriorates
Solution Approach 1:
The composite uses temperature as a parameter to control its mechanical state, being pliable at implantation temperature and rigid at body temperature. This parameter change allows the material to sequentially provide ease of implantation followed by structural support, resolving the contradiction between these two requirements.
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 provides enhanced mechanical strength, facilitates bone growth, and is fully resorbed within a year, offering improved handling and recovery times while maintaining structural integrity during implantation and integration.
Implementation Method 1
the composite is in a substantially pliable state at a temperature from about 40 degrees C to about 90 degrees C, and wherein the composite is in a substantially rigid state at a temperature of about 37 degrees C or less
Implementation Method 2
the polymer matrix has a porosity of about 20% to about 80%
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A biocompatible, resorbable composite for osteosynthesis includes osteoconductive particles dispersed within a porous polymer matrix having a plurality of fluid passageways that expose at least a portion of a plurality of the osteoconductive particles to an exterior of the polymer matrix. The composite may further include a chemical additive incorporated within the polymer matrix, the chemical additive being configured to modify one or more of acidity, degradation rate, melting point, hydrophilicity, and hydrophobicity of the polymer matrix. A method for making the composite includes mixing the osteoconductive particles with polymer material and the chemical additive to form a mixture and treating the mixture to bind the osteoconductive particles with the polymer material to create a solid unit.