Hydrophilic Polymer Lubrication Coating With Chelate Crosslinking
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Solution Overview
Problem
Existing methods for lubricating medical devices fail to provide durable and biocompatible surfaces that resist friction effectively, as commonly used crosslinking agents are unstable in aqueous solutions or result in polymers with limited lubricity.
Innovation Solution
A method involving crosslinking hydrophilic polymers using stable transition metal chelates, such as titanium, zirconium, or hafnium chelates, to create a layer of crosslinked polymers that maintains a layer of non-crosslinked hydrophilic polymers for enhanced lubrication, specifically using hyaluronic acid crosslinked with titanium or zirconium chelates to achieve a durable and lubricating surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If commonly used crosslinking agents are used to stabilize the hydrophilic polymer layer, then the structural stability is improved, but the lubrication properties deteriorate due to formation of crosslinked polymers with very little lubricity
Solution Approach 1:
The coating is divided into two distinct layers: a lower layer of crosslinked hydrophilic polymer providing structural stability, and an upper layer of non-crosslinked hydrophilic polymer providing lubrication properties. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the coating have different properties: the lower layer is crosslinked for stability and structural support, while the upper layer remains non-crosslinked for lubrication. This local differentiation of properties resolves the contradiction between stability and lubrication.
2Duration of action of stationary object
If the hydrophilic polymer layer is crosslinked to improve durability, then the resistance to friction is improved, but the biocompatibility may be compromised due to use of unstable crosslinking agents in aqueous solutions
Solution Approach 1:
The crosslinking agent is changed from conventional organic crosslinkers to water-soluble transition metal chelates, which are stable in aqueous solutions and biocompatible. This parameter change allows crosslinking to occur in physiological conditions without compromising biocompatibility while achieving the desired durability.
3Ease of manufacture
If a simple and rapid lubrication process is used, then the ease of manufacture is improved, but the structural durability of the coating deteriorates
Solution Approach 1:
The hydrophilic polymer layer is deposited on the surface before crosslinking occurs. This preliminary action allows the polymer to form a complete coating that can then be selectively crosslinked in the lower layer, achieving both simplicity of process and durability of structure.
Solution Approach 2:
Water-soluble transition metal chelates serve as intermediaries that enable crosslinking in aqueous environments. These chelates facilitate the crosslinking reaction under mild conditions, maintaining process simplicity while achieving structural durability through effective crosslinking.
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 produces a surface with improved durability and lubrication properties, maintaining a layer of non-crosslinked hyaluronic acid on crosslinked hyaluronic acid structures, providing effective friction resistance and biocompatibility.
Implementation Method 1
The crosslinking of the polymeric structure by a water-soluble transition metal chelate makes it possible to maintain a layer of non-crosslinked hydrophilic polymers which thus confers lubricating properties to said rigidified hydrophilic polymer structure
Implementation Method 2
a first layer of an amphiphilic compound exhibiting self-assembly properties
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a method for lubricating a component consisting of a hydrophilic compound crosslinked by means of a water-soluble transition metal chelate.