Single-Process Bilayer Scaffold Preparation via Phase Separation
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Solution Overview
Problem
Conventional methods for preparing bilayer scaffolds are complex, involve separate manufacturing of polymer scaffolds, and often result in incomplete attachment and separation issues, limiting their effectiveness for cell culture and tissue regeneration.
Innovation Solution
A single-process method involving the preparation of a first polymer aqueous solution, addition of a second polymer and an anion surfactant, high-temperature and high-speed stirring, freeze-drying, and cross-linking with a selected agent to create a structurally and chemically specific bilayer scaffold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bilayer scaffold is prepared by separately manufacturing polymer scaffolds and attaching them, then the structure can be formed, but the attachment is incomplete and separation occurs
Solution Approach 1:
The patent combines two separate polymer scaffold manufacturing processes into a single simultaneous process where both polymers are mixed in aqueous solution, stirred at high temperature and speed to induce phase separation, and frozen together to form a integrated bilayer structure, eliminating the need for separate attachment steps
Solution Approach 2:
The patent utilizes phase separation during high-temperature stirring and freezing to naturally form distinct bilayer structures from a mixed polymer solution, and employs cross-linking during freezing to lock the structure in place, ensuring complete attachment without separation
2Manufacturing precision
If bilayer scaffold is prepared by separately manufacturing polymer scaffolds, then each layer can be controlled, but the preparation process becomes complicated
Solution Approach 1:
The patent merges separate scaffold manufacturing into a single process by mixing both polymers in aqueous solution and using simultaneous phase separation and freezing to form the bilayer structure, greatly simplifying the preparation process while maintaining layer control
Solution Approach 2:
The patent controls the bilayer structure by adjusting parameters such as polymer concentration, stirring temperature (80-120°C), stirring speed (800-2000 rpm), and freezing conditions, allowing precise layer formation through a single simplified process
3Productivity
If conventional carrier is used for cell culturing, then cell adhesion can be achieved, but mass culturing is limited due to insufficient adhesion
Solution Approach 1:
The patent creates a composite bilayer scaffold combining two different polymers with complementary properties - one providing excellent cell adhesion and the other providing structural support and porosity for nutrient diffusion, enabling both strong adhesion and mass culturing capability
Solution Approach 2:
The patent creates a porous sponge structure through freezing and sublimation that allows nutrient and oxygen diffusion throughout the scaffold while maintaining strong cell adhesion on the surface, enabling mass culturing of cells
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
This method allows for the production of a completely attached bilayer scaffold that facilitates effective cell adhesion, proliferation, and tissue regeneration, particularly useful for wound treatment and tissue engineering by promoting the regeneration of skin, cartilage, and bone tissues without causing immune responses.
Implementation Method 1
adding an anion surfactant into solution blended with two polymers and reacting by stirring at high temperature and high speed to induce phase separation
Implementation Method 2
dipping the sponge in a cross-linking agent thereby rendering be cross-linked
Implementation Method 3
freeze-drying the stirred reactant thereby obtaining a sponge
Data Source
AI summary
Disclosed is a method for preparing a bilayer scaffold through single process comprising: preparing a first polymer aqueous solution; adding a second polymer into the first polymer aqueous solution and stirring a reactant; adding a surfactant into the stirred reactant and stirring the reactant at high temperature and high speed; freeze-drying the stirred reactant thereby obtaining a sponge; dipping the sponge in a cross-linking agent thereby rendering be cross-linked; and freeze-drying the cross-linked reactant.