Phosphate-Buffered PCL Microsphere Pre-Dispersion for Bubble Reduction
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Solution Overview
Problem
Existing methods for preparing polycaprolactone (PCL) microspheres for medical aesthetics face challenges in maintaining smooth surface integrity and uniform dispersion in carboxymethyl cellulose gel, leading to bubble formation and increased degradation rates due to water penetration, which can cause inflammatory responses and reduce the effectiveness of the microspheres.
Innovation Solution
A polycaprolactone microsphere pre-dispersed composition using a phosphate buffer as the dispersion medium, comprising specific phosphate salts and pH regulators, is employed to maintain microsphere integrity and reduce degradation, ensuring smooth dispersion and bubble reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If PCL microspheres are dispersed in CMC gel using conventional methods, then the microspheres can be suspended in the gel, but bubbles form and surface smoothness is lost
Solution Approach 1:
The patent applies preliminary action by pre-dispersing PCL microspheres in phosphate buffer solution before mixing with CMC gel. This pre-dispersion step ensures microspheres are properly wetted and positioned, preventing bubble formation during subsequent gel mixing while maintaining surface smoothness.
Solution Approach 2:
The patent uses phosphate buffer solution as an intermediary medium between PCL microspheres and CMC gel. The buffer facilitates smooth dispersion and mixing by acting as a transition phase, reducing direct interaction between hydrophobic microspheres and hydrophilic gel that causes bubbling.
2Ease of operation
If water penetrates into PCL microspheres, then the microspheres can be dispersed in the gel, but degradation occurs due to hydrolysis of ester bonds
Solution Approach 1:
The patent changes the chemical environment parameter by using phosphate buffer solution with controlled pH instead of pure water or unbuffered solutions. This pH control reduces the rate of hydrolysis of ester bonds in PCL microspheres while still allowing adequate dispersion in the gel matrix.
Solution Approach 2:
The phosphate buffer solution creates a chemically inert environment that minimizes water penetration and hydrolytic degradation of PCL microspheres. The buffer system stabilizes the chemical environment, protecting the ester bonds from rapid hydrolysis while permitting necessary dispersion.
3Manufacturing precision
If PCL microspheres are mixed evenly in CMC gel, then uniform distribution is achieved, but the mixing process is difficult due to high viscosity
Solution Approach 1:
The patent applies preliminary action by pre-dispersing PCL microspheres in phosphate buffer solution before mixing with CMC gel. This pre-dispersion step reduces aggregation and facilitates easier mixing with the viscous gel, achieving uniform distribution with simpler mixing processes.
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 phosphate buffer effectively maintains the smooth spherical form of PCL microspheres, reducing degradation and bubble formation, thereby enhancing product stability and minimizing inflammatory responses post-injection.
Implementation Method 1
hydrolysis of PCL microspheres is related to penetration of microspheres by water. When water penetrates into microspheres, an overall degradation process will take place, with the result that ester bonds throughout the polymer matrix are gradually hydrolysed from the inside
Implementation Method 2
some air will be adsorbed on the surface before PCL microspheres are mixed into CMC gel, the problem of liquid and gas starting to contend for the microsphere surface will arise
Data Source
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AI summary
Disclosed in the present invention are a polycaprolactone microsphere pre-dispersion composition and a polycaprolactone injectable gel prepared from same. In the polycaprolactone microsphere pre-dispersion composition, polycaprolactone microspheres can continue to maintain their integrity as complete spheres with smooth surfaces and good dispersity, and have a reduced degradation rate; and bubbles can be reduced in a mixing process, thereby helping to ensure the stability of product quality, and reducing the occurrence probability of a nodule and a granuloma caused by uneven dispersion after the microspheres are injected into a body. The application value of the polycaprolactone injectable gel prepared from the polycaprolactone microsphere pre-dispersion composition is higher.