Decellularized Nerve Conduit via Supercritical Fluid Extraction
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Solution Overview
Problem
Existing methods for treating nerve defects, such as nerve stretching, autologous nerve conduit transplantation, and artificial nerve conduit transplantation, face challenges including high risk of nerve breaking, surgical limitations, toxicity from residual surfactants, and lower regeneration success rates.
Innovation Solution
A decellularized nerve conduit is developed using a supercritical fluid extraction process without surfactant treatment, which maintains optimized mechanical properties like tensile strength and elastic recovery force, facilitating easier transplantation and suturing while avoiding toxicity and transplant rejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surfactant treatment is used for decellularization, then cell removal is effective, but mechanical properties deteriorate and toxicity occurs
Solution Approach 1:
The patent changes the physical-chemical parameters of the extraction system by using supercritical carbon dioxide (temperature above 31.1°C and pressure above 73 atm) instead of conventional surfactant solutions. This parameter change enables effective decellularization while preserving mechanical properties, as the supercritical fluid can be completely removed without residual toxicity and does not denature structural proteins like collagen
Solution Approach 2:
The patent replaces the chemical mechanism (surfactant action) with a physical mechanism (supercritical fluid extraction). The supercritical CO2 physically dissolves and removes cellular components through solubility differences without requiring chemical denaturation, thereby maintaining the integrity of extracellular matrix proteins and mechanical strength
2Reliability
If surfactant treatment is used for decellularization, then cell removal is effective, but residual surfactant causes toxicity
Solution Approach 1:
The patent uses supercritical carbon dioxide as a temporary extraction medium that completely evaporates after use. The CO2 is introduced in supercritical state for extraction, then pressure is reduced to allow complete phase change to gas, leaving no residual liquid surfactant behind. This eliminates the toxicity problem associated with residual surfactants while maintaining effective decellularization
3Reliability
If surfactant treatment is used for decellularization, then cell removal is effective, but structural form is difficult to maintain
Solution Approach 1:
The patent replaces chemical degradation (surfactant denaturation) with physical extraction (supercritical fluid dissolution). The supercritical CO2 selectively extracts cellular components based on solubility without chemically attacking the extracellular matrix structure, thereby preserving the tubular shape and histological architecture of the nerve conduit
4Reliability
If autologous nerve conduit transplantation is performed, then regeneration success rate is high, but surgery is required at both damaged and transplanted areas
Solution Approach 1:
The patent extracts and removes the cellular components from donated nerve tissue, creating an acellular matrix scaffold. This extracted scaffold can be implanted without requiring a second surgical site for harvesting, as the cellular material is removed chemically/physically rather than surgically harvested. The resulting decellularized conduit provides structural guidance while avoiding the need for additional donor site surgery
5Device complexity
If artificial nerve conduit transplantation is performed, then surgical complexity is reduced, but regeneration success rate is lower
Solution Approach 1:
The patent creates a composite structure combining the advantages of natural and artificial conduits: the extracellular matrix scaffold from donated tissue provides biological cues and structural guidance similar to autologous tissue, while the decellularization process removes immunogenic cellular components. This composite approach - natural matrix structure with minimized biological rejection - achieves high regeneration success without requiring complex autologous harvesting surgery
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 decellularized nerve conduit achieves improved mechanical properties and reduced toxicity, enabling effective nerve regeneration with minimized transplant rejection and surgical complications, making it suitable for treating nerve defects.
Implementation Method 1
extracting the pretreated nervous tissue with supercritical fluid
Implementation Method 2
a) pretreating nervous tissue separated from a subject with a hypertonic buffer
Implementation Method 3
c) washing, with a phosphate buffer, the nervous tissue extracted with supercritical fluid
Data Source
AI summary
The present invention relates to a decellularized nerve conduit prepared using a supercritical fluid extraction process. More specifically, the present invention relates to a decellularized nerve conduit having optimized mechanical properties such as tensile strength and elastic restoring force by using a supercritical fluid extraction process. The nerve conduit according to the present invention is decellularized without a surfactant treatment, so that not only are mechanical properties maintained, but there is no toxicity due to residual surfactant, and transplant rejection is minimized, so that the nerve conduit can be usefully employed in treating patients with nerve defects.