Vacuum-Dried Amniotic Membrane Preservation
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Solution Overview
Problem
Conventional freeze-drying of amniotic membranes causes structural damage and depletion of soluble factors due to the pre-freeze step, leading to reduced efficacy in tissue repair and regeneration applications.
Innovation Solution
Vacuum-drying of amniotic membranes without a pre-freeze step, using lyoprotectants like trehalose and raffinose, and antioxidants such as epigallocatechin gallate to preserve the membrane's structural integrity and retain soluble factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional freeze-drying is used to preserve amniotic membrane for room temperature storage, then the membrane can be stored without cold chain, but the pre-freeze step causes structural damage and depletion of soluble factors
Solution Approach 1:
The amniotic membrane is pre-treated with lyoprotectants (such as trehalose, raffinose, or mannitol) and antioxidants (such as epigallocatechin gallate) before vacuum-drying. This preliminary protection prevents structural damage and soluble factor depletion during the drying process, allowing the membrane to be vacuum-dried without the harmful pre-freeze step while maintaining both storage convenience and membrane integrity
Solution Approach 2:
The invention changes the physical and chemical parameters of the amniotic membrane through controlled vacuum-drying at specific temperatures (0-25°C) and pressures (10-100 mbar) for defined time periods (1-48 hours). Combined with lyoprotectant concentration (5-50% w/v), these parameter changes enable preservation without freezing, resolving the contradiction between storage ease and membrane reliability
2Reliability
If vacuum-drying is performed without pre-freeze step, then soluble factors are retained, but the drying process may still cause structural damage without protective agents
Solution Approach 1:
Lyoprotectants such as trehalose, raffinose, or mannitol act as intermediary substances that protect the amniotic membrane structure during vacuum-drying. These agents form protective complexes with cellular components and soluble factors, preventing direct damage from water removal while allowing the membrane to be dried without freezing. The antioxidants like epigallocatechin gallate further mediate protection by preventing oxidative damage during the drying process
Solution Approach 2:
The invention creates a composite structure by impregnating the amniotic membrane with lyoprotectants and antioxidants, forming a protective matrix that stabilizes both the cellular structure and soluble factors during vacuum-drying. This composite approach combines multiple protective agents working synergistically to maintain structural integrity while enabling freeze-free drying
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 vacuum-dried amniotic membranes retain a higher percentage of soluble factors, releasing them over a longer period, enhancing tissue repair and regeneration while maintaining structural integrity, thus improving clinical effectiveness compared to conventional cryopreservation methods.
Implementation Method 1
Conventional freeze-drying requires the tissue to be frozen prior to drying, resulting in structural freeze damage. It is possible to dry it in a freeze-dryer vacuum without the pre-freeze step
Implementation Method 2
Conventional freeze-drying requires the tissue to be frozen prior to drying
Implementation Method 3
using lyoprotectants like trehalose and raffinose, and antioxidants such as epigallocatechin gallate to preserve the membrane's structural integrity and retain soluble factors
Implementation Method 4
antioxidants such as epigallocatechin gallate to preserve the membrane's structural integrity and retain soluble factors
Data Source
Figure 1A~1J
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to a preserved amniotic membrane, in particular a vacuum-dried amniotic membrane. It also relates to uses of vacuum-dried amniotic membrane and methods for making a vacuum-dried amniotic membrane. A method of processing an amniotic membrane to provide a vacuum-dried amniotic membrane, comprising the step of vacuum-drying the amniotic membrane. Amniotic membrane (AM) is the inner most extraembryonic membrane that surrounds the foetus in a sac of amniotic fluid, functioning as a protective barrier to ascending infection and trauma during pregnancy.