Plasma Coating Gradient Layers for Medical Barrier Packaging
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Solution Overview
Problem
Conventional medical packaging materials interact with drugs, leading to undesirable leachable materials, reduced drug potency, and potential immune responses, due to permeability issues and material interactions.
Innovation Solution
The method involves forming a coating on medical devices and substrates using a plasma process, where a first precursor and an oxygen-containing precursor are used to create a concentration gradient, reducing carbon and hydrogen concentrations in subsequent layers to enhance barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional medical packaging materials are used, then the packaging can be manufactured with standard materials, but the materials interact with drugs causing undesirable leachable materials and reduced drug potency
Solution Approach 1:
The coating is divided into multiple layers with different compositions and functions. The first layer contains higher carbon and hydrogen concentrations for flexibility and adhesion, while subsequent layers have progressively lower concentrations for improved barrier properties, creating a segmented structure that addresses both mechanical and barrier requirements
Solution Approach 2:
Different regions of the coating have different material properties. The coating transitions from a more organic, flexible first layer to denser, more inorganic subsequent layers, creating local quality variations that provide both mechanical compliance at the substrate interface and superior barrier performance at the outer surfaces
Solution Approach 3:
The coating uses composite material structure combining organic precursors (silane, titanium, aluminum, zinc, indium, zirconium, antimony, or germanium compounds) with oxygen-containing precursors to create layers with graded compositions. This composite approach enables simultaneous achievement of flexibility, adhesion, and impermeability
2Reliability
If a single-layer coating is applied, then the manufacturing process is simple, but the barrier properties against water and oxygen ingress are insufficient
Solution Approach 1:
The coating system is segmented into multiple deposited layers, each with controlled thickness and composition. This segmentation allows the first layer to provide flexibility and adhesion while subsequent layers provide progressive barrier enhancement, achieving superior overall barrier properties that a single layer cannot provide
Solution Approach 2:
The solution moves from a single-layer to a multi-layer dimensional structure, adding the dimension of layering to the coating system. This dimensional change enables gradient control of material properties through the thickness direction, providing both mechanical and barrier functions that cannot be achieved in a single layer
3Strength
If the coating has high carbon and hydrogen concentration, then the coating has good flexibility and adhesion, but the permeability to water and oxygen increases
Solution Approach 1:
The coating is segmented into layers with graded carbon and hydrogen concentrations. The first layer has higher concentrations for flexibility and adhesion, while subsequent layers have progressively lower concentrations for reduced permeability, creating a gradient structure that resolves the contradiction between mechanical properties and barrier performance
Solution Approach 2:
Different layers of the coating have different local compositions optimized for their specific functions. The first layer locally provides mechanical compliance and adhesion with higher organic content, while outer layers locally provide barrier protection with lower organic content and higher inorganic content, achieving both flexibility and impermeability through spatial variation
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
This approach produces multi-layer barriers that effectively limit water and oxygen ingress, enhancing the shelf life and stability of medical materials while reducing the risk of immune responses.
Implementation Method 1
forming a plasma of a first precursor and an oxygen-containing precursor
Implementation Method 2
forming a coating of material on a substrate may include forming a plasma of a first precursor and an oxygen-containing precursor
Data Source
AI summary
Exemplary methods of forming a coating of material on a substrate may include forming a plasma of a first precursor and an oxygen-containing precursor. The first precursor and the oxygen-containing precursor may be provided in a first flow rate ratio. The methods may include depositing a first layer of material on the substrate. While maintaining the plasma, the methods may include adjusting the first flow rate ratio to a second flow rate ratio. The methods may include depositing a second layer of material on the substrate.