Non-fibrous Collagen-Polyester Film for Cell Sheet Harvesting
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Solution Overview
Problem
Traditional regenerative cell therapy methods, such as using cell suspensions with trypsin, damage cell surface proteins, affecting cell function and interactions, leading to uneven distribution and reduced repair efficiency, while cell sheet technology offers better cell concentration and uniformity but requires optimal substrates for stem cell differentiation.
Innovation Solution
A non-fibrous film composed of collagen and a polyester polymer, with a swelling rate of 1-200 µm/hour, providing mechanical and structural stimuli for cell growth and differentiation without additional chemical or mechanical stimuli, promoting uniform cell layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cell suspension method with trypsin is used, then cell delivery is simple, but cell surface proteins are damaged and cell function is reduced
Solution Approach 1:
The invention extracts and eliminates the harmful element (trypsin) from the cell harvesting process by using a non-enzymatic detachment method where cells are naturally released from the substrate through confluence, preserving cell surface proteins while achieving cell delivery
Solution Approach 2:
The system utilizes the cells' own natural behavior (contact inhibition and spontaneous detachment upon confluence) to achieve cell harvesting without external enzymatic intervention, allowing cells to self-release while maintaining integrity
2Reliability
If cell sheet technology is used, then cell concentration and uniformity are improved, but substrate control for stem cell differentiation is challenging
Solution Approach 1:
The invention applies local quality by creating specific micropore structures (1-10 μm) only in the substrate regions where cell attachment occurs, providing localized mechanical stimuli that guide differentiation without requiring complex overall substrate design
Solution Approach 2:
The invention changes the physical parameters of the substrate by controlling micropore size (1-10 μm) and incorporating specific polymers (gelatin, collagen, fibrin) to create appropriate mechanical stiffness and surface properties that induce stem cell differentiation without chemical factors
3Reliability
If chemical stimulation is used for cell differentiation, then differentiation can be induced, but control is difficult due to concentration gradient and action time
Solution Approach 1:
The invention replaces the chemical stimulation system with a mechanical stimulation system, using the physical micropore structure of the substrate to provide mechanical cues that guide stem cell differentiation, eliminating the need for chemical concentration control
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 film supports dynamic cell growth and differentiation, enhancing tissue regeneration by maintaining cell interactions and promoting uniform cell distribution and proliferation, addressing the limitations of traditional cell therapy methods.
Implementation Method 1
the non-fibrous film has a swelling rate of 1-200 μm/hour or a swelling proportion per unit time of 0.1-2%/hour in an aqueous liquid
Data Source
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AI summary
A non-fibrous film of which the composition includes a collagen and a polyester polymer is provided. A content of the polyester polymer in the non-fibrous film is 1-60 wt%. Moreover, the non-fibrous film has a swelling rate of 1-200 µm/hour or a swelling proportion per unit time of 0.1-2%/hour in an aqueous liquid.