Acellular Dermal Tissue Decellularization with Supercritical CO2
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Solution Overview
Problem
Existing methods for preparing acellular dermal tissues for transplantation suffer from issues such as denaturation of proteins, weakened mechanical properties, and immune rejection due to surfactant treatment, making them unsuitable for effective skin tissue repair.
Innovation Solution
Acellular dermal tissues are prepared using supercritical fluid extraction without surfactant treatment, maintaining mechanical properties like critical load and elasticity, and minimizing residual toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surfactant treatment is used to prepare acellular dermal tissue, then cell removal is achieved, but mechanical properties such as critical load and elasticity are weakened
Solution Approach 1:
The patent changes the physical-chemical parameters of the treatment medium by using supercritical carbon dioxide instead of conventional surfactants. This parameter change allows effective cell removal while preserving the mechanical properties of the extracellular matrix, as supercritical CO2 acts as a gentle extracting agent that does not denature proteins or degrade structural components like collagen and elastin.
Solution Approach 2:
The patent replaces the chemical mechanism of surfactant action with a physical extraction mechanism using supercritical fluid. Instead of relying on surfactant molecules to emulsify and remove cellular components, the supercritical CO2 uses its unique solvation properties to extract lipids and cellular debris, thereby avoiding the mechanical and chemical damage that surfactants cause to the extracellular matrix.
2Reliability
If surfactant treatment is used to prepare acellular dermal tissue, then decellularization is achieved, but residual surfactant toxicity remains
Solution Approach 1:
The patent employs supercritical carbon dioxide which, after serving its decellularization function, can be easily evaporated and removed from the tissue. The CO2 transitions from supercritical state to gas phase, leaving no residual traces or toxic effects. This disposable nature of the supercritical fluid eliminates the need for extensive washing steps required to remove residual surfactants.
Solution Approach 2:
Carbon dioxide in its supercritical state provides an inert extraction environment that does not react with or damage the biological tissue. After extraction, the CO2 can be completely evaporated, leaving a clean, residue-free tissue product. This inert atmosphere approach avoids the persistence and potential toxicity of organic surfactant molecules that remain embedded in the tissue matrix.
3Reliability
If proteolytic enzymes are used for cell removal, then immunogenic cells are removed, but antigen components remain causing immune rejection
Solution Approach 1:
The patent replaces enzymatic digestion with physical supercritical fluid extraction. Instead of using proteolytic enzymes that selectively break down cellular proteins and leave behind antigenic fragments, the supercritical CO2 physically extracts cellular components through solvation. This mechanical/physical approach removes both immunogenic cells and antigenic proteins more completely, reducing the risk of immune rejection.
Solution Approach 2:
The patent uses supercritical fluid extraction to take out and remove cellular components, including immunogenic cells and antigen-containing proteins, from the dermal tissue. The supercritical CO2 penetrates the tissue structure and extracts these harmful components through its solvation power, leaving behind a cleaner acellular matrix with reduced immunogenicity compared to enzymatic methods that may leave residual antigens.
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 supercritical fluid-extracted acellular dermal tissues exhibit improved extracellular matrix preservation and mechanical properties, reducing transplant rejection and toxicity, making them suitable for treating damaged skin tissue.
Implementation Method 1
extracting the separated dermal layer with a supercritical fluid
Data Source
AI summary
The present invention relates to a decellularized acellular dermal tissue prepared using supercritical fluid extraction. More specifically, the present invention relates to an acellular dermal tissue having an improved level of extracellular matrix preservation and optimized mechanical properties such as critical load and elastic restoring force by using supercritical fluid extraction. The acellular dermal tissue according to the present invention is obtained through decellularization without a surfactant treatment so that mechanical properties are maintained, does not possess toxicity resulting from residual surfactants and minimizes transplant rejection, and thus can be effectively used for treatment of patients with damaged skin tissue.