Microelectrode Arrays with Dielectrophoretic Cell Positioning
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Solution Overview
Problem
Existing microelectrode arrays face challenges in precisely positioning neuronal cells for effective electrophysiological measurements, as current methods using physical containment and surface patterning are unsatisfactory in achieving higher signal amplitudes and controlled stimulation.
Innovation Solution
A microelectrode sensing device with a substrate and array of sensors, featuring a recording electrode and positioning electrodes that generate an electric field pattern to confine cells using dielectrophoretic forces, allowing for precise positioning and recording of electrical activities from target cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If physical containment methods (micro-wells, micro-channels) or surface patterning are used to position neuronal cells, then cell positioning control is improved, but the effectiveness of stimulation and signal amplitude remain insufficient
Solution Approach 1:
The patent replaces mechanical/physical containment methods (micro-wells, micro-channels) with an electric field-based positioning system. Positioning electrodes generate dielectrophoretic forces that automatically position cells on recording electrodes without physical constraints, thereby improving both positioning precision and stimulation effectiveness simultaneously.
Solution Approach 2:
The patent changes the physical state and parameters of the positioning mechanism from static physical structures to dynamic electric field parameters. By controlling voltage amplitude and frequency on positioning electrodes, the system can dynamically adjust dielectrophoretic forces to achieve optimal cell positioning and stimulation conditions.
2Reliability
If cells are positioned远离 recording electrodes, then cell survival and growth are improved, but signal amplitude and recording quality decrease
Solution Approach 1:
The patent introduces dynamic control of cell positioning through time-varying electric fields. Cells can be positioned close to recording electrodes during recording phases and moved away during stimulation or culture phases, optimizing both signal quality and cell viability at different times rather than maintaining a fixed position.
Solution Approach 2:
The positioning electrodes serve multiple functions: they can generate dielectrophoretic forces for cell positioning, provide electrical stimulation to cells, and create electric field patterns for cell confinement. This multi-functionality allows the system to optimize different parameters (positioning, stimulation, recording) using the same component.
3Manufacturing precision
If manual cell positioning methods are used, then positioning control is achieved, but time consumption and operational complexity increase
Solution Approach 1:
The system enables self-service cell positioning where cells automatically position themselves on recording electrodes through dielectrophoretic forces generated by the positioning electrodes. This eliminates the need for manual positioning operations, significantly reducing time consumption and operational complexity while maintaining high positioning accuracy.
Solution Approach 2:
The patent implements preliminary positioning of cells using dielectrophoretic forces before actual electrophysiological recording begins. This preliminary action ensures cells are optimally positioned in advance, eliminating the need for time-consuming manual adjustment during the recording process.
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 device effectively positions cells near the recording electrodes, enhancing signal amplitude and effectiveness of stimulation, enabling improved electrophysiological measurements and analysis, such as impedance spectroscopy and pharmacological studies.
Implementation Method 1
The positioning electrodes are designed to generate an electric field pattern in the sensing region to move and confine the target cells to a sub-region of the sensing region that at least partially overlaps the recording electrode
Data Source
AI summary
A microelectrode sensing device includes a substrate and an array of microelectrode sensors. Each sensor includes a first conductive layer that at least partially conducts electricity. The first conductive layer is formed above the substrate and patterned to include a recording electrode that measures electrical activities of target cells. Each sensor also includes a second conductive layer that at least partially conducts electricity. The second conductive layer is elevated above the first layer and patterned to include multiple positioning electrodes arranged to define a sensing region above the recording electrode. The positioning electrodes are designed to generate an electric field pattern in the sensing region to move and confine the target cells to a sub-region of the sensing region that at least partially overlaps the recording electrode.