Alginic Acid Salt Gel Composition for Cartilage Fixation Control
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Solution Overview
Problem
The application of monovalent metal salts of alginic acid for cartilage regeneration is hindered by uncertainties in fixation and spread, necessitating excessive application and laborious washing, and there is a need for stable storage without precipitation of coloring components.
Innovation Solution
A combination of a first material composition containing a monovalent metal salt of alginic acid and a second composition with a cross-linking agent, incorporating a coloring component like Blue No. 1, allows for reliable fixation and evaluation of gel formation through visual confirmation, ensuring stable storage and preventing spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a monovalent metal salt of alginic acid is applied to cartilage defect without cross-linking agent, then the material can be easily applied in fluid state, but the material spreads to surrounding area and fixation is unreliable
Solution Approach 1:
The material is prepared in a fluid state with predetermined viscosity and composition before application, allowing it to be easily applied to the cartilage defect site. The fluid state enables simple application without requiring complex delivery systems, while the pre-formulated composition ensures proper gelation characteristics upon contact with the cross-linking agent.
Solution Approach 2:
The material undergoes a phase transition from fluid state during application to gel state after contact with the cross-linking agent. This phase change enables the material to be easily applied in fluid form and then reliably固定在 the target site as a gel, solving both the ease of application and fixation reliability requirements.
2Reliability
If excessive amount of material is applied to ensure fixation, then reliable fixation is achieved, but laborious washing is required and material spread is increased
Solution Approach 1:
The rapid gelation upon contact with the cross-linking agent creates a firm gel structure that prevents material spread and eliminates the need for excessive washing. The phase transition from fluid to gel state occurs quickly enough to secure fixation reliability while minimizing the amount of material that requires washing.
Solution Approach 2:
The viscosity and gelation speed parameters are optimized to achieve rapid gel formation with minimal material. By controlling the concentration of the monovalent metal salt of alginic acid and the cross-linking agent, the material gels quickly enough to prevent spread but slowly enough to allow complete gelation before washing is needed, reducing washing time and material usage.
3Reliability
If cross-linking agent is added immediately after application, then fixation is achieved, but gel formation cannot be visually evaluated
Solution Approach 1:
The material includes a pH-sensitive color indicator that changes color in response to the pH change caused by the cross-linking agent. This color change provides visual feedback on the gel formation process, allowing the practitioner to evaluate whether adequate gelation has occurred while the cross-linking agent is acting on the material.
Solution Approach 2:
The pH-sensitive color indicator acts as an intermediary between the chemical reaction (cross-linking) and the visual observation. It translates the invisible chemical changes into visible color changes, enabling real-time evaluation of gel formation without interfering with the cross-linking process or fixation reliability.
4Stability of the object's composition
If material is applied without coloring component, then stable storage is achieved, but application point and gel formation cannot be confirmed
Solution Approach 1:
The material contains a pH-sensitive color indicator that remains stable during storage but changes color upon contact with the cross-linking agent. This allows the material to maintain storage stability while providing visual confirmation of the application point and gel formation during the procedure through the color change response.
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 solution enables reliable fixation and easy evaluation of gel formation, enhancing procedural accuracy and safety with stable storage conditions, facilitating effective cartilage regeneration.
Implementation Method 1
a cross-linking agent is added for fixation to gel the material
Implementation Method 2
a second material composition containing a cross-linking agent having an action of cross-linking the monovalent metal salt of alginic acid
Implementation Method 3
the coloring component is 0.0005% by mass to 0.05% by mass of Blue No. 1, i.e. brilliant blue FCF
Data Source
Figure 1(a)~1(c)
Figure 2
AI summary
Realized is reliable fixation of a material in a fluid state containing a monovalent metal salt of alginic acid when the material is applied to a subject. A combination of compositions comprising a first material composition containing a monovalent metal salt of alginic acid and a second material composition containing a cross-linking agent having an action of cross-linking the monovalent metal salt of alginic acid, wherein the combination is to be used in such a way as to apply the first material composition to a subject in a fluid state and contact the second material composition with the first material composition applied to the subject to gel at least a part of the first material composition, wherein the first material composition further contains a coloring component so that a formation state of a gel coat on a surface of the first material composition applied to the subject can be evaluated.