Multi-layer Vapor Deposition Coating for Implantable Medical Devices
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Solution Overview
Problem
Current packaging technologies for implantable medical devices are not cost-effective and do not adequately protect components from bodily fluids, leading to potential corrosion and degradation, while also failing to ensure hermetic sealing at room temperature.
Innovation Solution
A biocompatible multi-layer coating is applied via vapor deposition, comprising sets of layers with parylene and inorganic materials, where each layer differs in diffusion barrier properties, with the interface between layers dominating impurity transport, enhancing the overall barrier effect and applied in multiple sets to cover three-dimensional components and substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer packaging is used, then the manufacturing process is simple and cost-effective, but the barrier protection against bodily fluids is insufficient
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different properties (parylene polymer layers and inorganic barrier layers) to create a multi-layer packaging structure. Each layer contributes different barrier characteristics, with the inorganic layers providing diffusion barriers and the parylene layers providing mechanical protection and hermetic sealing, achieving superior overall barrier protection against bodily fluids.
Solution Approach 2:
The packaging structure is segmented into multiple distinct layers including at least one parylene layer and at least one inorganic layer. This segmentation allows each layer to be optimized for specific functions - the parylene layers provide hermetic sealing and mechanical integrity while the inorganic layers provide diffusion barriers - thereby achieving reliable barrier protection through functional division.
2Stability of the object's composition
If high temperature processing is used, then the packaging material becomes more stable, but temperature defects occur in the medical device components
Solution Approach 1:
The patent changes the processing temperature parameter from high temperature to substantially room temperature for applying the parylene coating. This parameter change prevents temperature defects in sensitive medical device components while still achieving proper coating formation and hermetic sealing through controlled vapor deposition at lower temperatures.
Solution Approach 2:
The patent replaces high-temperature thermal processing with vapor deposition technology to apply the protective coating. This substitution allows the packaging material to be applied at substantially room temperature, avoiding thermal damage to device components while maintaining coating stability and protective properties.
3Reliability
If conventional packaging materials are used, then the manufacturing cost is low, but hermetic sealing at room temperature cannot be achieved
Solution Approach 1:
The patent uses thin film structures, specifically parylene coatings applied via vapor deposition, to achieve hermetic sealing. These thin films provide effective barrier properties and hermetic sealing at room temperature while maintaining compatibility with existing manufacturing processes, balancing cost-effectiveness with reliable sealing performance.
4Reliability
If the packaging layer thickness is increased, then the barrier effect is improved, but the permeability to bodily fluids decreases
Solution Approach 1:
The patent employs composite material structures where inorganic layers provide diffusion barriers that are highly effective at preventing bodily fluid penetration. These inorganic layers (such as metals, metal oxides, or metal nitrides) provide superior barrier properties compared to single-layer polymer structures, achieving enhanced protection without requiring excessive thickness.
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 multi-layer coating provides improved protection against bodily fluids and temperature defects, reducing permeability and enhancing the durability of medical devices by increasing the number of layer interfaces, thus achieving a robust and cost-effective hermetic sealing solution.
Implementation Method 1
a biocompatible multi-layer coating applied by vapour deposition to conform to and sealingly cover at least a portion of the components
Implementation Method 2
each layer differs in at least one diffusion barrier property from the other layers in the set and adds to the overall barrier effect of the coating
Implementation Method 3
the inorganic material is generated from a downstream plasma enhanced chemical vapour deposition
Data Source
Figure 1~2
Figure 3
AI summary
An implantable medical device including a plurality of components on a substrate, and a biocompatible multi-layer coating applied by vapour deposition to conform to and sealingly cover at least a portion of the components and/or the substrate. The coating is applied in at least two sets, each set having first, second and third layers. At least one of the first, second and third layers consist essentially of a polymer such as parylene and at least one of the other two layers of the set consist essentially of inorganic material such that each layer differs in at least one diffusion barrier property from the other layers in the set and adds to an overall barrier effect of the coating.