Microfluidic Chip Production via Plasma Surface Activation
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Solution Overview
Problem
Current microfluidic chip production methods face challenges such as hydrophobic surface issues with PDMS, inefficient protein coating, and difficulties in scalable and repeatable protein binding, leading to reduced sensitivity and increased production costs.
Innovation Solution
A microfluidic production process involving 3D designed chip components, surface activation with sodium hydroxide and glutaraldehyde, protein coating with diffuser humidification, and closure using double-sided tape to ensure precise protein placement and efficient chip assembly, enabling mass production with improved sensitivity and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PDMS material is used for microfluidic chip production, then flexibility and ease of manufacturing are improved, but hydrophobic surface issues reduce protein coating efficiency and sensitivity
Solution Approach 1:
The patent applies plasma treatment to change the surface parameters of PDMS material, transforming it from hydrophobic to hydrophilic. This modifies the surface energy and wetting properties, enabling efficient protein coating while maintaining the bulk properties and manufacturability of PDMS.
Solution Approach 2:
The patent creates a composite structure by combining PDMS bulk material with a plasma-treated surface layer. This composite approach maintains the ease of manufacture and flexibility of PDMS while adding the hydrophilic properties needed for effective protein binding, resolving the contradiction between manufacturability and sensitivity.
2Device complexity
If conventional protein coating methods are used, then simplicity of process is maintained, but protein binding is not scalable and repeatable leading to increased production costs
Solution Approach 1:
The patent performs plasma treatment and protein coating in a sequential automated manner where the surface preparation is done in advance before protein binding. This preliminary action ensures consistent surface properties that enable scalable and repeatable protein coating processes, improving production efficiency while maintaining reasonable process complexity.
Solution Approach 2:
The patent replaces manual mechanical protein coating methods with an automated system that uses controlled fluid delivery and environmental conditions. This substitution enables precise, repeatable protein binding at scale, increasing productivity without proportionally increasing complexity.
3Adaptability or versatility
If ELISA testing with 96 wells is used, then comprehensive testing capability is achieved, but response time exceeds one hour and cannot be used for POCT
Solution Approach 1:
The patent segments the testing function into a microfluidic chip format with integrated channels and reservoirs, allowing parallel processing of multiple samples in a compact format. This segmentation enables rapid analysis while maintaining the ability to test multiple parameters, reducing response time from over an hour to minutes while preserving comprehensive testing capability.
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 process allows for controlled surface geometry and function, efficient protein coating, and scalable production of microfluidic chips with enhanced sensitivity and lower unit prices, addressing the limitations of existing methods.
Implementation Method 1
Activation of the bottom chip surfaces with sodium hydroxide solution by immersing them into a secondary immersion tank
Implementation Method 2
The second modification of the bottom chip surfaces with glutaraldehyde solution by immersing them into a fourth immersion tank
Implementation Method 3
The first modification of the bottom chip surfaces with Polyethyleneimine solution by immersing them into a third immersion tank
Implementation Method 4
Incubating the bottom chips on which the protein solution is dripped, within an incubator system with diffuser humidification which provides humidity
Implementation Method 5
closure using double-sided tape to ensure precise protein placement and efficient chip assembly
Data Source
AI summary
The invention is concerned with the production process of a microfluidic chip developed to identify antibodies and proteins, as well as cellular types, viruses and bacteria in the blood to be used in the medical device industry.