pH-Responsive Chitosan Wound Dressing for Gentle Removal
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Solution Overview
Problem
Existing wound dressing materials face challenges in easy removal without damaging the tissue, particularly sensitive wound tissues, and often require mechanical stress that can irritate or tear underlying tissue during detachment.
Innovation Solution
A method involving a water-soluble tissue dressing material that converts into an insoluble form at neutral pH, allowing for easy application and removal using an acidic detachment solvent, reducing adherence and facilitating gentle removal without tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a water-soluble tissue dressing material is applied to the wound, then easy application and initial adhesion are achieved, but the material adheres too strongly to the tissue making removal difficult and damaging
Solution Approach 1:
The patent applies dynamics by making the dressing material's solubility change over time and in response to environmental conditions. The material transitions from water-soluble (easy application) to pH-dependent solubility (controlled adhesion and easy removal). This dynamic property allows the material to adapt its behavior: initially soluble for easy application, then forming stable adhesion, and finally becoming soluble again under acidic conditions for painless removal.
Solution Approach 2:
The patent employs parameter changes by modifying the solubility characteristics of the dressing material through pH adjustment. The material's solubility parameter is changed from always water-soluble to conditionally soluble based on pH levels. This allows the material to maintain strong adhesion at neutral pH while becoming soluble again in acidic detachment solvent, resolving the contradiction between adhesion strength and ease of removal.
2Force
If mechanical stress is applied to remove the dressing material, then removal force is sufficient, but the underlying tissue is irritated or torn
Solution Approach 1:
The patent replaces the mechanical removal system with a chemical dissolution system. Instead of using mechanical force to peel off the dressing material (which causes tissue damage), the patent uses an acidic detachment solvent to chemically dissolve the material's adhesion. This substitution transforms the removal mechanism from mechanical stress to chemical action, eliminating tissue irritation while achieving complete removal.
3Reliability
If chitosan with high degree of deacetylation is used, then antibacterial properties are enhanced, but solubility control and gentle removal become more difficult
Solution Approach 1:
The patent applies parameter changes by carefully controlling the degree of deacetylation of chitosan within the optimal range of 70-90%. This parameter optimization balances antibacterial effectiveness (which requires high deacetylation) with solubility characteristics (which facilitate easy removal). Additionally, the patent changes the solubility parameter through pH control, making the material soluble in acidic detachment solvent regardless of deacetylation level, thus maintaining ease of removal while preserving antibacterial properties.
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 method ensures minimal irritation and damage during removal, accelerates wound healing by using deacetylated chitosan with low degrees of acetylation, and provides localized antibacterial properties, reducing the risk of infections and promoting swift recovery.
Implementation Method 1
A method involving a water-soluble tissue dressing material that converts into an insoluble form at neutral pH
Implementation Method 2
allowing for easy application and removal using an acidic detachment solvent, reducing adherence and facilitating gentle removal without tissue damage
Data Source
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AI summary
A water-soluble solid or water-soluble gel-like tissue dressing material for use in a method of treating a tissue of a patient, the method comprising the steps of: applying the water-soluble solid or water soluble gel-like tissue dressing material in contact with the patient's tissue; and allowing the water-soluble tissue dressing material to convert into a form in which it is insoluble in water at neutral pH.