Uniform Plasma Treatment of Dielectric Surfaces
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Solution Overview
Problem
Polymer materials used for stents and artificial blood vessels face challenges in preventing biological material adhesion, which leads to bio-film formation and reduced functionality due to their low permittivity, making it difficult to achieve uniform surface treatment, especially in small-diameter tubes or irregularly shaped devices.
Innovation Solution
A method is developed to determine the discharge inception voltage of dielectric materials by applying different pressures to their surfaces and using electrodes to generate a displacement field, allowing for uniform plasma formation on the entire surface, which can then be treated with reaction gases to modify the surface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma treatment methods are used on dielectric materials with low permittivity, then the treatment process is simple, but uniform plasma generation on the entire surface cannot be achieved
Solution Approach 1:
The patent applies different pressures to different surfaces of the dielectric material - higher pressure on the electrode-facing surface and lower pressure on the opposite surface. This local differentiation of pressure conditions enables uniform plasma generation across the entire surface area, resolving the uniformity issue that plagues conventional treatment methods.
Solution Approach 2:
The patent changes the pressure parameter across different regions of the dielectric material during plasma treatment. By maintaining higher pressure on one surface and lower pressure on the opposite surface, the method creates optimal conditions for uniform plasma discharge across the entire surface, overcoming the limitations of low permittivity materials.
2Ease of manufacture
If polymer materials are used for stents to reduce cost, then manufacturing cost decreases, but expansibility and long-term functionality are reduced due to biological material adhesion
Solution Approach 1:
The patent applies plasma treatment to the polymer stent surface before the stent is deployed in the body. This preliminary surface modification creates a displacement field that prevents biological material adhesion in advance, ensuring long-term functionality while maintaining the cost advantages of polymer materials.
Solution Approach 2:
The patent changes the surface properties of the polymer material through plasma treatment under controlled pressure conditions. This creates a surface that resists biological adhesion, thereby maintaining the reliability and long-term functionality of the stent while preserving the cost benefits of using polymer materials.
3Manufacturing precision
If plasma treatment is applied to dielectric materials with low permittivity, then surface modification can be achieved, but uniform plasma distribution across the entire surface is difficult
Solution Approach 1:
The patent configures electrodes to apply localized pressure and electric field conditions to specific regions of the dielectric material. By creating higher pressure conditions on the electrode-facing surface and lower pressure on the opposite surface, uniform plasma distribution is achieved across the entire surface area despite the low permittivity of the material.
Solution Approach 2:
The patent changes the pressure and electric field parameters during plasma treatment to compensate for the low permittivity of dielectric materials. By maintaining higher pressure on one surface and lower pressure on the opposite surface, uniform plasma generation is achieved across the entire surface, overcoming the inherent difficulties of treating low permittivity materials.
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 method enables uniform surface treatment of dielectric materials, preventing biological adhesion and improving biocompatibility, allowing for long-term functionality and reduced thrombosis risk in medical devices like stents and artificial blood vessels.
Implementation Method 1
it has been confirmed that when a predetermined voltage of an external electric field is applied, a displacement field is formed inside and on the entire surface of the dielectric material
Implementation Method 2
when a predetermined voltage of an external electric field, for example, a voltage the same as or higher than the discharge inception voltage, is applied, a displacement field is formed inside and on the entire surface of the dielectric material, thereby confirming the possibility of uniform surface treatment using plasma
Data Source
AI summary
The present invention relates to a method for checking a discharge inception voltage of a dielectric material, a method for forming a displacement field on the dielectric materials comprising applying a voltage the same as or higher than the discharge inception voltage generated by an external field obtained from the above to the dielectric material to which electrodes are connected, a method for forming plasma on the surfaces of the dielectric material comprising injecting reaction gases and applying a voltage the same as or higher than the discharge inception voltage obtained above to the dielectric material to which electrodes are connected, a method for forming a displacement field on the entire surface of the dielectric material comprising applying a voltage the same as or higher than the discharge inception voltage obtained above to the dielectric material to which electrodes are connected, and a dielectric material which is modified, in which the surfaces thereof are treated with plasma by the methods described above.