Electro-wetting Biosensor for Precise Cell Manipulation
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Solution Overview
Problem
Existing biosensors are not entirely satisfactory for convenient cell incubation and precise biological feature identification in optofluidic manipulation, limiting their effectiveness in applications like drug discovery and monoclonal antibody production.
Innovation Solution
A biosensor with electro-wetting chambers, comprising photodiodes, electrodes, and conductive layers, uses electro-wetting and electrophoretic forces to manipulate cells, forming optical patterns and electric fields for precise cell positioning and fluorescent detection, enabling efficient single-cell manipulation and rapid drug discovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional biosensors are used for cell manipulation, then basic sensing functions are achieved, but cell positioning precision and manipulation efficiency are insufficient
Solution Approach 1:
The biosensor is divided into multiple sensor units, each with independent photodiodes, electrodes, and electro-wetting chambers. This segmentation allows parallel processing of multiple cells simultaneously, improving manipulation efficiency while maintaining precise control over individual cell positioning through independent electrode control in each unit.
Solution Approach 2:
The invention merges multiple functions into a single integrated biosensor platform: optical detection (photodiodes), electro-wetting control (electrodes and non-polar liquid), and cell manipulation (electrophoretic forces). This integration enables simultaneous cell positioning, manipulation, and detection, resolving the contradiction between precision and efficiency.
2Adaptability or versatility
If electro-wetting chambers are added to improve cell manipulation capability, then cell positioning and optical patterning are enhanced, but device complexity increases
Solution Approach 1:
The electro-wetting chamber serves multiple functions: it enables optical patterning through refractive index changes, generates electrophoretic forces for cell manipulation, and provides a controllable interface for cell positioning. This multi-functionality increases adaptability without requiring separate systems for each operation, thereby limiting the increase in overall device complexity.
3Manufacturing precision
If multiple electrodes and conductive layers are implemented for precise electric field control, then cell manipulation precision is improved, but manufacturing complexity increases
Solution Approach 1:
Different conductive layers (first electrode, second electrode, bottom conductive layer, top conductive layer) are positioned at specific locations with distinct functions. The first electrode and photodiodes are in direct contact for localized detection, while the second electrode controls the non-polar liquid interface. This localized functional assignment enables precise electric field control for cell manipulation while streamlining the manufacturing process by assigning specific roles to each layer.
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 biosensor facilitates rapid and efficient cell manipulation and fluorescent detection, enhancing the drug discovery process by allowing precise control over cell positioning and identification, thereby improving the throughput of drug development.
Implementation Method 1
the light that reflect off (or is emitted by) the biometric object or bio-sample is directed to the photodiode of the biosensor
Implementation Method 2
A biosensor with electro-wetting chambers, comprising photodiodes, electrodes, and conductive layers, uses electro-wetting and electrophoretic forces to manipulate cells
Implementation Method 3
uses electro-wetting and electrophoretic forces to manipulate cells, forming optical patterns and electric fields for precise cell positioning
Implementation Method 4
forming optical patterns and electric fields for precise cell positioning
Data Source
Figure 1A
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Figure 2
AI summary
A biosensor is provided. The biosensor includes a plurality of sensor units. Each of the sensor units includes a plurality of photodiodes, a plurality of first electrodes, an electro-wetting chamber, a second electrode, a bottom conductive layer, a photoconductive layer, an open cell chamber, and a top conductive layer. The first electrodes are disposed above the photodiodes. The electro-wetting chamber is disposed above the first electrodes, and a non-polar liquid is disposed in the electro-wetting chamber. The second electrode is disposed on the electro-wetting chamber. The bottom conductive layer is disposed above the second electrode. The photoconductive layer is disposed on the bottom conductive layer. The open cell chamber is disposed on the photoconductive layer and configured to receive a cell. The top conductive layer is disposed on the open cell chamber.