Hemostatic Polymer Gel Adhesion via Ionic Crosslinking
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Solution Overview
Problem
Existing hemostatic devices often disrupt wound healing by dehydrating the wound site, leading to premature disengagement of platelet plugs and fibrin clots due to insufficient adhesion.
Innovation Solution
A biocompatible polymer composition comprising a combination of polyanionic and polycationic polymers, such as sodium alginate and chitosan, with a solvent like water, which forms a gel that adheres to the wound site without limiting hydration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dry hemostatic devices are used to dehydrate the wound site, then adhesive strength is improved, but wound healing is slowed due to retarded epithelialization
Solution Approach 1:
The invention changes the physical state parameter of the hemostatic device from dry to hydrated/gel form. The gel composition maintains adequate hydration during hemostasis, eliminating the need to dehydrate the wound site for adhesion, thus avoiding the delay in epithelialization and wound healing while still providing sufficient adhesive strength through the gel matrix and ionic crosslinking mechanisms
Solution Approach 2:
The invention uses a composite gel composition containing polyanionic polymers (e.g., sodium alginate), polycationic polymers (e.g., chitosan), and calcium ions. This composite system provides adhesive strength through ionic crosslinking between the oppositely charged polymers and calcium bridges, eliminating the need for mechanical dehydration while maintaining effective hemostatic adhesion
2Reliability
If adhesive strength is increased through dehydration, then hemostatic stability is improved, but wound hydration is limited
Solution Approach 1:
The invention inverts the conventional approach by using a hydrated gel composition instead of a dry dehydrating device. The gel form inherently maintains wound hydration while achieving hemostatic stability through the gel matrix structure and ionic crosslinking mechanisms, eliminating the trade-off between adhesion and hydration
Solution Approach 2:
The gel composition acts as an intermediary medium that simultaneously provides adhesive strength and maintains hydration. The gel matrix and ionic crosslinks (calcium bridges between alginate and chitosan) provide the necessary mechanical stability for hemostasis while the hydrated gel structure prevents wound dehydration, allowing both functions to coexist
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 polymer composition effectively facilitates and maintains hemostasis by rapidly forming a strong clot that withstands vertical strain, while allowing for continued wound hydration, thus promoting healing.
Implementation Method 1
the biocompatible polymeric gel composition comprises (a) a polyanionic polymer, (b) a polycationic polymer, and (c) a solvent
Implementation Method 2
facilitating and maintaining hemostasis. The biocompatible polymeric gel composition generally comprises (a) a polyanionic polymer, (b) a polycationic polymer, and (c) a solvent
Data Source
AI summary
The invention relates to biocompatible polymer gel compositions useful in facilitating and maintaining hemostasis. The biocompatible polymeric gel composition is comprised of (a) one or more than one polyanionic polymer, (b) one or more than one polycationic polymer, and (c) a solvent. A preferred composition includes sodium alginate, chitosan, and water to produce an adhesive hemostatic device that is useful in facilitating and maintaining rapid hemostasis.