Dual-Layer Lubricious Coating for Low-Particulate Medical Devices
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Solution Overview
Problem
Existing lubricious coatings for medical devices are ineffective in reducing friction, lack durability, and release undesirable particulate matter when exposed to an aqueous environment.
Innovation Solution
A dual-layer coating comprising a vinyl pyrrolidone polymer as a first layer and an acid group-containing polymer, such as acrylic acid, with hydrogen bonding between the layers, which includes photoreactive groups for cross-linking, to enhance mechanical strength and lubricity while minimizing particulate release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lubricious coating is applied to reduce friction, then patient comfort and procedural ease improve, but the coating releases particulate matter when exposed to aqueous environments
Solution Approach 1:
The coating is divided into multiple layers with distinct functions: a base layer providing lubricity and a top layer providing mechanical strength and particulate resistance. This segmentation allows each layer to optimize its specific function without compromising the other, resolving the contradiction between ease of operation and harmful particulate release.
Solution Approach 2:
The invention uses composite material structure combining different polymer layers with complementary properties. The base layer contains lubricious materials while the top layer provides structural integrity and particulate resistance, creating a composite coating that simultaneously achieves low friction and low particulate release.
2Ease of operation
If existing lubricious coatings are used, then friction reduction is attempted, but the coatings lack durability and effectiveness
Solution Approach 1:
The base layer is applied first to establish the lubricious foundation before the top layer is added. This preliminary action ensures that the friction-reducing properties are established early, while the subsequent top layer reinforces durability, resolving the contradiction between friction reduction and coating durability.
Solution Approach 2:
The composite structure combines a lubricious base layer with a durable top layer, allowing the coating to maintain both low friction properties and high durability throughout the device's service life.
3Strength
If hydrogen bonding between layers is implemented, then mechanical strength and lubricity increase, but coating complexity increases
Solution Approach 1:
The invention changes the chemical parameter of the coating interface by introducing hydrogen bonding between layers. This parameter change enhances mechanical strength and lubricity without requiring complex multi-layer structures, as the hydrogen bonding occurs naturally at the interface between the base and top layers.
Solution Approach 2:
The interface between the base layer and top layer acts as an intermediary zone where hydrogen bonding occurs. This intermediary mechanism provides strong adhesion and enhanced mechanical properties without requiring additional complex structural elements, resolving the contradiction between strength and complexity.
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 coating provides sustained lubricity and low particulate generation, maintaining friction reduction over extended use and exposure to aqueous environments, with improved mechanical strength and hemocompatibility.
Implementation Method 1
a first coated layer including a vinyl pyrrolidone polymer and a photoreactive group
Implementation Method 2
The coating can include hydrogen bonding between the vinyl pyrrolidone polymer of the first coated layer and the acid group-containing polymer (e.g., acrylic acid polymer) of the second coated layer
Data Source
AI summary
Embodiments of the disclosure include lubricious coatings. In an embodiment the disclosure includes a lubricious coating for a medical device including first and second coated layers. The first coated layer is between the second coated layer and the device surface and includes a vinyl pyrrolidone polymer and a photo reactive group. The second coated layer is in direct contact with the first coated layer and is a top coating that includes an acrylic acid polymer. The second coated layer can optionally include photoreactive groups. The coating was found to have a very low number of particulates (e.g., 10 μm or greater) which is very desirable for in vivo use.