Thermal-Responsive Polymer Networks for Bone Grafting
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Solution Overview
Problem
Current shape memory materials, such as shape memory alloys (SMAs) and shape memory polymers (SMPs), face limitations in biomedical applications due to low deformability, high-temperature and time-consuming processing, poor biocompatibility, and degradability, which hinder their use in surgeries like bone grafting and osteosarcoma treatments.
Innovation Solution
Development of shape memory compositions with tunable transition temperatures based on multifunctional building block cores and polymer mixtures, including hydrocarbon and heterocyclic units, with functional groups like hydroxyls, amines, and carboxylic acids, allowing for one-way or two-way shape memory effects and integration with calcium phosphate or apatite minerals for bone grafting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shape memory alloys and polymers are used in biomedical applications, then shape memory effect is achieved, but biocompatibility and degradability are poor
Solution Approach 1:
The patent employs composite materials by combining polymer chains with calcium phosphate or apatite minerals to create shape memory compositions that exhibit both shape memory effect and improved biocompatibility. The composite structure allows the material to maintain its functional properties while being compatible with bone tissue for biomedical applications.
Solution Approach 2:
The patent utilizes parameter changes by selecting polymer chains with specific glass transition temperatures (Tg) that can be tuned to match physiological conditions. By adjusting the Tg parameter of the polymer to be near body temperature, the material exhibits shape memory effect at relevant biomedical temperatures while maintaining biocompatibility through appropriate polymer selection.
2Ease of operation
If shape memory materials are used for bone grafting, then shape change capability is achieved, but processing is high-temperature and time-consuming
Solution Approach 1:
The patent changes the temperature parameter by using polymers with glass transition temperatures near physiological conditions (around 37°C). This allows the shape memory effect to occur at low temperatures relevant to surgical procedures, eliminating the need for high-temperature processing and reducing surgical time.
3Adaptability or versatility
If shape memory compositions are designed with polymer mixtures, then tunable transition temperatures are achieved, but material complexity increases
Solution Approach 1:
The patent achieves tunable transition temperatures by changing the compositional parameters of polymer mixtures. By adjusting the ratios and types of polymer chains with different Tg values, the overall transition temperature of the composition can be precisely tuned to match specific surgical requirements without requiring complex material architectures.
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 new compositions provide enhanced biocompatibility, flexibility, and strength for surgical fitting and osteointegration, addressing the limitations of existing materials by enabling shape change at specific temperatures and promoting bone repair.
Implementation Method 1
Some compositions comprise polymer mixtures providing tunable transition temperatures that allows a composition to change shape at predetermined temperatures
Implementation Method 2
Thermal-responsive materials—shape memory alloys (SMA) and shape memory polymers (SMP)—are capable of switching between shapes upon exposure to a particular thermal environment
Data Source
AI summary
The invention relates to materials comprising polymer network containing siloxanes or organic-based core structures, preferably the materials have thermal-responsive properties. In some embodiments, the invention relates to an organic core functionalized with polymers. In another embodiment, organic core-polymer conjugates comprise polylactone segments. The organic core-polymer conjugates may be crosslinked together to form a material, and these materials may be functionalized with bioactive compounds so that the materials have desirable biocompatibility or bioactivity when used in medical devices. In some embodiments, the invention relates to silsesquioxane groups functionalized with polymers. In another embodiment, silsequioxane-polymer conjugates comprise polylactone segments. The silsequioxane-polymer conjugates may be crosslinked together to form a material, and these materials may be functionalized with bioactive compounds so that the materials have desirable biocompatibility or bioactivity when used in medical devices. In further embodiments, the invention relates to composite materials that contain a polymer matrix and aggregates, and in some embodiments, methods of making, and methods of using these materials. Preferably, the aggregates are calcium phosphate aggregates. Preferably, the material is resistant to fracture. In further embodiments, the materials are used in surgical procedures of bone replacement. In further embodiments, the materials contain polyhedral silsesquioxanes and/or biodegradable segments.