Crosslinked Polysaccharide Hydrogels for Sustained Soft-Tissue Volume
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Solution Overview
Problem
Existing crosslinked polysaccharide-based hydrogels used for soft tissue filling face biocompatibility issues and lack mechanical properties suitable for creating and maintaining volume under facial movements, particularly when minimally modified.
Innovation Solution
Development of crosslinked polysaccharide-based hydrogels with a modification ratio ≤1% and a projection index PIdx ranging from 50% to <80%, prepared under specific conditions, ensuring high biocompatibility and ability to maintain thickness under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the degree of modification of the polysaccharide is reduced to improve biocompatibility, then the hydrogel loses mechanical properties suitable for volume creation and thickness maintenance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the modification ratio to ≤1% and the projection index to 50-80%, transforming the hydrogel's mechanical and biological properties to simultaneously achieve high biocompatibility and sufficient volumizing capability. This quantitative parameter optimization resolves the contradiction between minimal modification and functional performance.
Solution Approach 2:
The patent creates a composite hydrogel system combining minimally modified polysaccharide (≤1% modification ratio) with specific crosslinking structures to achieve both biocompatibility and mechanical strength. The composite nature of the hydrogel network allows simultaneous fulfillment of biological safety and volumizing functional requirements.
2Strength
If crosslinking agents are used in sufficient quantities to achieve desired mechanical properties, then the hydrogel gains volumizing capability but loses biocompatibility
Solution Approach 1:
The patent changes the parameter of crosslinking agent quantity by limiting the modification ratio to ≤1%, which controls the amount of chemical modification while maintaining sufficient crosslinking for mechanical strength. This parameter optimization achieves the desired balance between volumizing capability and biocompatibility.
3Ease of manufacture
If conventional rheological measurements are used to characterize hydrogels, then the characterization is simple but fails to predict in vivo behavior under compression
Solution Approach 1:
The patent introduces a new measurement parameter, the projection index (PIdx), which ranges from 50-80% for volumizing hydrogels. This new parameter specifically characterizes the hydrogel's ability to maintain thickness under compression, directly predicting in vivo performance while maintaining measurement feasibility.
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 hydrogels effectively create and sustain moderate/subtle volumes in soft tissues while maintaining biocompatibility, suitable for various aesthetic and medical applications.
Implementation Method 1
Hydrogels suitable for filling soft tissues are typically crosslinked hydrogels, i.e., the polysaccharide is crosslinked by means of one or more crosslinking agents
Implementation Method 2
hydrogels intended for deep implantation... must advantageously have an intrinsic ability to sustainably maintain their thickness in the layers of the skin, including under stress from facial movements
Data Source
AI summary
The present disclosure relates to hydrogels based on crosslinked polysaccharides having ability to create moderate volumes which are maintained over time. The hydrogels have a modification ratio less than or equal to 1% and a projection index PIdx ranging from 50 to less than 80%.