Plasma-Enhanced Siloxane Coating for Medical Syringe Friction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Medical containers, such as syringes and tubes, face issues with high breakout and breakloose forces due to friction, leading to sudden surges during liquid dispensing, and there is a need for a lubricity mechanism that prevents material leaching and gas/water permeability, while maintaining the integrity of biological and pharmaceutical materials.
Innovation Solution
A medical article with a coating comprising organopolysiloxane and a deposition product applied by plasma-enhanced chemical vapor deposition, using monomers like N-vinyl pyrrolidone, vinyl acetate, and ethylene oxide, which reduces friction forces and prevents material interaction with biological substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymeric materials are used for medical containers, then the containers are lighter and less expensive, but they become permeable to gases and can react with biological materials
Solution Approach 1:
The patent applies composite materials by combining polymeric container materials with a siloxane-based coating layer. This composite structure allows the container to retain the cost and weight advantages of polymers while the coating layer provides gas barrier properties and chemical inertness, preventing permeability issues and reactions with biological materials.
2Reliability
If glass containers are used, then gas permeability is prevented, but the containers are fragile and expensive to manufacture
Solution Approach 1:
The patent creates a composite structure where a polymeric container is coated with a siloxane-based layer that provides glass-like gas barrier properties. This allows the container to achieve the gas permeability resistance of glass while maintaining the lightweight and cost-manufacturing advantages of polymeric materials.
3Ease of operation
If a lubricating coating is applied to reduce friction, then breakout and breakloose forces are reduced, but the coating may react with or leach into biological materials
Solution Approach 1:
The patent modifies the chemical parameters of the coating by using a specific siloxane-based composition with controlled crosslinking density and functional groups. This creates a coating that provides the desired low-friction sliding properties while maintaining chemical inertness, preventing reactivity and leaching into biological materials through proper molecular structure design.
4Ease of operation
If surfaces are made highly lubricious to reduce sustaining force, then smooth sliding is achieved, but control over liquid dispensing becomes difficult
Solution Approach 1:
The patent applies local quality by creating a coating with spatially varying properties - the inner layer provides lubricity for smooth sliding while the outer layer or surface morphology provides controlled friction for precise dispensing. This gradient structure allows both smooth operation and controlled stopping at desired positions.
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 achieves low breakout, breakloose, and sustaining forces, ensuring smooth sliding contact and long-term stability, preventing particle formation and maintaining the integrity of biological materials, thus enhancing the accuracy and safety of liquid dispensing.
Implementation Method 1
a deposition product applied by plasma-enhanced chemical vapor deposition of a composition comprising at least one monomer
Data Source
Figure 1a~1b
Figure 2
Figure 3~4
AI summary
This invention relates to medical articles, such as syringe assemblies, including a substrate having a coating on a surface thereof, the coating including: (1) at least one organopolysiloxane and (2) a deposition product applied to the at least one organopolysiloxane by plasma - enhanced chemical vapor deposition of a composition including at least one monomer selected from the group consisting of N-vinyl pyrrolidone, vinyl acetate, ethylene oxide, alkyl acrylate, alkyl methacrylate, acrylamide, acrylic acid, and mixtures thereof, and methods of making and using the same.