Biochip Serum Separation via Curved Microchannel Capillary Flow
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Solution Overview
Problem
Current biochips face challenges in early disease detection, particularly for cancers, due to limitations in sensitivity, specificity, and the ability to use various bodily fluids, with existing technologies being costly and requiring complex manufacturing processes, and they often lack the capability for self-separation of serum during blood analysis.
Innovation Solution
A biochip with microchannels that utilize molecularly imprinted polymers and interdigitated electrodes for enhanced antigen-antibody interaction detection, capable of self-driven capillary flow for serum separation without external pressure, and featuring a hybrid sensing technology combining temperature variation, electric oscillation, and capacitance charge for precise cancer diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If glass is used in biochip manufacturing, then structural stability is improved, but manufacturing cost and complexity increase due to etching problems and extreme construction limitations
Solution Approach 1:
The patent changes the material parameter from glass to polymer, specifically using polydimethylsiloxane (PDMS) which offers different physical and chemical properties. This material substitution resolves the contradiction by providing ease of manufacture through soft lithography techniques while maintaining structural stability through proper device design and support structures.
Solution Approach 2:
The patent employs composite material structures by combining PDMS polymer layers with glass substrates or other supportive materials. This composite approach allows the system to benefit from both the manufacturing advantages of polymer (ease of fabrication) and the structural advantages of glass (stability), thereby resolving the contradiction between these two requirements.
2Ease of manufacture
If polymer materials are used in biochip construction, then ease of manufacture is improved through soft lithography, but fluid flow is reduced due to hydrophobic nature
Solution Approach 1:
The patent changes the surface property parameter of the polymer by applying surface treatments such as plasma treatment or chemical coating to modify the contact angle and reduce hydrophobicity. This allows the polymer material to maintain its manufacturing advantages while improving fluid wettability and flow characteristics through parameter modification.
Solution Approach 2:
The patent applies different surface treatments or coatings to different regions of the polymer structure. By localizing hydrophilic modifications to specific areas where fluid flow is critical, while maintaining the bulk polymer properties for manufacturing ease, the system resolves the contradiction between ease of manufacture and fluid flow productivity.
3Measurement precision
If current biochip sensitivity is used for early disease detection, then diagnostic capability is limited, but increasing sensitivity requires more complex sensing mechanisms and higher costs
Solution Approach 1:
The patent merges multiple sensing mechanisms into a single integrated biochip system. By combining optical sensing, electrical sensing, and fluid dynamic elements in one device, the system achieves high detection sensitivity for early disease markers without requiring multiple separate complex instruments, thereby resolving the contradiction between sensitivity and overall device complexity.
Solution Approach 2:
The patent introduces intermediary elements such as molecularly imprinted polymers (MIPs) or antibody-based recognition elements that act as mediators between the sample and the detection mechanism. These intermediaries enhance the sensitivity of detection by providing specific binding sites that amplify the signal, allowing early disease detection without requiring overly complex sensing mechanisms.
4Productivity
If external pressure is applied for blood flow in microchannel, then flow control is improved, but device complexity and cost increase due to requirement for external equipment
Solution Approach 1:
The patent implements self-service flow control by designing the microchannel system to utilize capillary action and surface tension forces that automatically drive fluid flow without external pressure application. This self-driven flow mechanism eliminates the need for external pumps or pressure devices, thereby resolving the contradiction between flow control capability and device complexity.
Solution Approach 2:
The patent employs hydraulic principles by designing the microchannel geometry and surface properties to optimize capillary-driven fluid flow. By carefully controlling channel dimensions, surface hydrophobicity, and fluid properties, the system achieves effective flow control through purely hydraulic mechanisms without requiring external pneumatic or mechanical pressure devices, thus reducing overall device complexity.
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 biochip enables early and accurate cancer detection with high sensitivity and specificity, allowing for self-evaluation and point-of-care diagnostics using a micro volume of blood, reducing the need for external equipment and sample preparation, and expanding diagnostic capabilities to various bodily fluids.
Implementation Method 1
The flow is self-driven using the natural phenomenon called surface tension of the blood flow
Implementation Method 2
the sensing methodology is a hybrid method of variation of capacitance charge
Implementation Method 3
A biochip with microchannels that utilize molecularly imprinted polymers and interdigitated electrodes for enhanced antigen-antibody interaction detection
Data Source
AI summary
Molecularly Imprinted Polymers (MIPs) are utilized to detect diseases and minimize false negative/positive scenarios. MIPs are implemented on a nano-electric circuit in a biochip where interactions of MIPs and an Antigen/Antibody (AG/AB) are detected, and disease specific biomarkers diagnosed. Biomarker detection is achieved with interdigitated gold electrodes in a biochip's microchannel. Capacitance changes due to biomarker interaction with AG/AB electrode coating diagnose diseases in a microfluidic environment. Biofluid passes through the microchannel and exposed to the nanocircuit to generate a capacitance difference and diagnose any specific disease in the biofluid sample. Blood capillary flow in a microchannel curved section experience centrifugal forces that separate liquid from solid. Various blood densities and segments experience different centrifugal effects while flowing through the curved section so serum is separated from various solid matter without using external devices.