Acellular Dermal Allografts Irradiation Sterilization
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Solution Overview
Problem
Current skin allografts have a short storage life, are prone to immunogenicity and infection, and are not well-suited for procedures like periodontal treatments or hernia repair due to their cellular content, which can lead to immune rejection and limited shelf life.
Innovation Solution
A method for preparing irradiation-sterilized acellular dermal allografts involving serial exposure to cell removal and epidermis removal solutions, followed by gamma irradiation, and storage in a controlled environment to maintain sterility and pliability, allowing for storage for up to 3 years.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If fresh skin allografts are used, then immediate wound coverage is achieved, but storage life is limited and immunogenicity complications arise
Solution Approach 1:
The patent removes cells from the dermal allograft through enzymatic digestion and mechanical agitation, extracting the immunogenic cellular components while retaining theacellular extracellular matrix. This extraction process eliminates the harmful immunogenic factors while preserving the structural integrity and wound coverage benefits of the allograft.
Solution Approach 2:
The patent applies gamma irradiation to change the physical and chemical parameters of the allograft, achieving terminal sterilization and further reducing immunogenicity. The irradiation process modifies the molecular structure of remaining contaminants and stabilizes the extracellular matrix, extending storage life while maintaining graft functionality.
2Duration of action of stationary object
If cellular dermal allografts are used, then immediate availability is provided, but immune rejection and limited shelf life occur
Solution Approach 1:
The patent systematically removes all viable cells from the dermal allograft through sequential enzymatic treatment with collagenase and elastase, followed by mechanical agitation. This complete cell extraction eliminates immune rejection risk while preserving the acellular extracellular matrix scaffold, enabling long-term storage without immune-mediated degradation.
Solution Approach 2:
The patent creates a terminally sterilized acellular product that can be stored for extended periods and used as a disposable graft material. The sterilization and acellular processing make the product stable for long-term storage, replacing the need for fresh, short-lived cellular allografts that require immediate use.
3Reliability
If irradiation sterilization is applied, then sterility and long-term storage are achieved, but potential damage to tissue properties may occur
Solution Approach 1:
The patent performs acellular processing and structural stabilization before applying gamma irradiation. By removing cells and stabilizing the extracellular matrix in advance, the tissue becomes more resistant to irradiation-induced damage. This preliminary preparation protects the structural integrity during sterilization while achieving terminal sterility.
Solution Approach 2:
The patent controls the gamma irradiation dose and environmental parameters during sterilization to minimize tissue damage. By optimizing irradiation parameters and conducting the process under controlled conditions, the patent achieves sterility while preserving the mechanical properties and ductility of the acellular dermal matrix.
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 method results in a sterile, pliable acellular dermal allograft with reduced immunogenicity and bioburden, maintaining ductility and re-cellularization properties similar to non-irradiated dermal allografts, suitable for soft tissue repair and extending shelf life to at least 3 years.
Implementation Method 1
exposing the allograft to irradiation; whereby the skin tissue can then be stored until use for periods of up to at least about 3 years
Implementation Method 2
drying the allograft by freeze drying (lyophilization)
Data Source
AI summary
A method for preparing a sterilized human acellular dermal allograft where the dermal allograft is sterilized by irradiation and has a greatly reduced bio-burden and enzymatic and antigenic activity. This product line of allografts can be easily used by surgeons in soft tissue replacement or repair and has an extended shelf life, of up to at least about three years.