Medical Hydrogel Composition with Controlled Swelling
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Solution Overview
Problem
Current medical hydrogels used for wound closure and tissue adhesion have high swelling properties, which can compress nerves and cause tissue irritation, and are often expensive and alkaline, making them unsuitable for neutral tissue environments.
Innovation Solution
A medical hydrogel composition comprising polylysine and polyethylene imine, combined with 4-arm-polyethylene glycol derivatives, which are mixed in specific buffer solutions to form a hydrogel with controlled swelling and neutral pH, ensuring biocompatibility and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high swelling hydrogel is used for wound closure and tissue adhesion, then wound healing and tissue bonding are improved, but nerve compression and tissue irritation occur
Solution Approach 1:
The patent changes the chemical composition parameters of the hydrogel by using polylysine (degree of polymerization 20-50) combined with polyethylene imine and 4-arm-polyethylene glycol derivatives. This compositional parameter change results in a hydrogel with controlled swelling ratio (0.5-2.0 times original volume) that maintains wound closure effectiveness while reducing nerve compression and tissue irritation.
2Reliability
If conventional medical hydrogels (Coseal mixed gel, Duraseal mixed gel) are used, then surgical sealing is achieved, but extreme swelling (558% and 98% weight increase) causes tissue damage
Solution Approach 1:
The patent creates a composite hydrogel material combining polylysine, polyethylene imine, and 4-arm-polyethylene glycol derivatives. This composite structure provides both surgical sealing performance and controlled swelling properties, avoiding the extreme swelling (558% and 98% weight increase) observed in conventional hydrogels like Coseal and Duraseal mixed gels.
3Object-affected harmful factors
If trilysine is used to create low swelling hydrogel, then swelling is reduced (-50% to 50%), but the material is expensive and produces alkaline hydrogel that irritates tissues
Solution Approach 1:
The patent replaces expensive trilysine with more cost-effective polylysine (degree of polymerization 20-50) combined with polyethylene imine and 4-arm-polyethylene glycol derivatives. This substitution achieves similar low swelling control while reducing material cost and producing a neutral pH hydrogel that does not irritate surrounding tissues.
4Object-affected harmful factors
If alkaline hydrogel is implanted in neutral tissue environment, then low swelling is achieved, but severe irritating effect occurs on surrounding cells
Solution Approach 1:
The patent adjusts the pH parameter of the hydrogel by selecting appropriate polymers (polylysine with degree of polymerization 20-50, polyethylene imine, and 4-arm-polyethylene glycol derivatives) that produce a neutral pH hydrogel. This parameter change maintains low swelling control while eliminating the alkaline irritating effect on surrounding cells in the neutral tissue environment.
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 resulting hydrogel has a low degree of swelling, is non-irritating to tissues, and exhibits good biocompatibility and antibacterial properties, making it suitable for use in sensitive areas like cranial, spinal, and peripheral nerves without causing tissue irritation.
Implementation Method 1
the first component comprises polylysine and polyethylene imine, the second component comprises one or more of 4-arm-polyethylene glycol-succinimidyl glutarate, 4-arm-polyethylene glycol-succinimidyl succinate, and 4-arm-polyethylene glycol-succinimidyl carbonate
Implementation Method 2
Hydrogel is a gel using water as a dispersion medium, and has a three-dimensional network structure. It is unable to be dissolved in water, and is able to swell in water and absorb large amount of water, making the volume of the hydrogel increase
Data Source
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AI summary
A medical hydrogel composition, a medical hydrogel, a preparation method therefore and an application thereof, and a medical hydrogel kit. The medical hydrogel composition comprises a first component and a second component; the first component comprises polylysine and polyethylene imine; the second component comprises one or more of 4-arm-polyethylene glycol-succinimidyl glutarate, 4-arm-polyethylene glycol-succinimidyl succinate, and 4-arm-polyethylene glycol-succinimidyl carbonate; the degree of polymerization of the polylysine is 20 or more. The medical hydrogel is formed by reacting the first component with the second component of the medical hydrogel composition. The medical hydrogel kit comprises the medical hydrogel composition and a buffer solution used for dissolving the components of the medical hydrogel composition. The medical hydrogel has a degree of swelling of -10% - 50%, and can be applied in narrow parts where cranial, spinal, and peripheral nerves are densely distributed.