Xenograft Dermal Implants: Decellularization for Reduced Immunogenicity
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Solution Overview
Problem
Existing biological tissue implants, particularly xenografts, face challenges with variability, limited availability, and immunogenicity, necessitating improved processing methods to enhance structural and mechanical properties while reducing antigenicity and pathogenic organisms.
Innovation Solution
A method involving decellularization and sterilization of xenograft dermal tissue using oxidizing agents like hydrogen peroxide, osmotic gradients, and sodium sulfide solutions, followed by dehydration and shaping, to create acellular grafts suitable for human implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If xenograft tissue is used to provide sufficient donor pool and controlled genetic attributes, then availability and consistency of implant material is improved, but immunogenicity and antigen rejection risk increases
Solution Approach 1:
The patent applies decellularization processes to extract and remove cellular components and antigens from xenograft tissue while preserving the extracellular matrix structure. This extraction of harmful cellular elements reduces immunogenicity while maintaining the structural integrity and availability of the implant material.
Solution Approach 2:
The patent employs chemical treatment parameters including oxidizing agents, osmotic gradients, and controlled dehydration to modify the tissue properties. These parameter changes transform the tissue from a highly immunogenic state to a biocompatible state with reduced antigenicity while preserving mechanical properties.
2Object-affected harmful factors
If extensive processing is applied to remove antigens and sterilize xenografts, then immunogenicity and pathogenic organism levels are reduced, but structural and mechanical properties may deteriorate
Solution Approach 1:
The patent carefully controls processing parameters including treatment duration, chemical concentrations, and dehydration levels to achieve sufficient antigen removal while preserving mechanical strength. The gradual progression through processing stages allows optimization of both safety and structural integrity.
Solution Approach 2:
The patent replaces harsh mechanical processing methods with chemical and osmotic processes that can penetrate tissue more uniformly without causing mechanical damage. This substitution allows effective sterilization and antigen removal while maintaining the structural framework of the xenograft.
3Stability of the object's composition
If dehydration is applied to preserve xenograft structure, then long-term storage and structural stability are improved, but tissue flexibility and handling characteristics worsen
Solution Approach 1:
The patent applies localized rehydration or plasticization treatments to specific regions of the dehydrated xenograft to restore flexibility where needed while maintaining structural stability in load-bearing areas. This local quality adjustment optimizes both storage stability and surgical handling.
Solution Approach 2:
The patent incorporates plasticizers or conditioning agents during the dehydration process to create a composite structure that combines the structural stability of dehydrated tissue with the flexibility provided by the added substances, achieving both storage stability and ease of handling.
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 process produces biocompatible xenografts with reduced immunogenicity, maintaining mechanical integrity and enabling neovascularization, suitable for surgical applications such as hernia repair, with minimal inflammatory response and rejection.
Implementation Method 1
treating the dermal tissue to remove hair, exposing the dermal tissue to a saline solution, exposing the dermal tissue to an oxidizing sterilant
Implementation Method 2
treating the dermal tissue with an aqueous sodium sulfide solution
Implementation Method 3
exposing the dermal tissue to a saline solution, dehydrating the dermal tissue
Data Source
AI summary
The present application is directed to the field of implants comprising soft tissue for use in implantation in humans. The soft tissue implants of the present application are preferably obtained from xenograft sources. The present application provides a chemical process that sterilizes, removes antigens from and/or strengthens xenograft implants. The present techniques yield soft tissue implants having superior structural, mechanical, and/or biochemical integrity. The present application is also directed to processes for treating xenograft implants comprising soft tissues such as dermis, and to implants produced by such processes.