MEA Connection Verification Circuits for Cell-Electrode Integrity
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Solution Overview
Problem
Existing verification devices for microelectrode arrays (MEAs) face challenges in accurately verifying connections between cells and electrodes, as well as between electrodes, due to issues like improper electrode formation, bubble interference, and single-cell coverage of multiple electrodes.
Innovation Solution
A verification device comprising an electrode array with analog front ends (AFEs) and a control circuit with connection verifying circuits (CVCs) that verify connections by determining gain values of AFEs and forming electrical signal paths through PMOS and NMOS transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional verification methods are used for MEA connections, then the verification process is simple, but the accuracy of verifying connections between cells and electrodes is insufficient
Solution Approach 1:
The verification device integrates multiple verification circuits (CVCs) within the MEA chip structure itself. Each CVC is nested between adjacent electrodes, allowing connection verification to be performed internally within the device architecture rather than requiring external complex equipment. This nesting approach enables accurate connection verification while maintaining a relatively compact and integrated device structure.
Solution Approach 2:
The patent introduces verification circuits (CVCs) as intermediary components that mediate the verification process between cells and electrodes. These CVCs act as mediators by providing dedicated signal paths and verification functionality, enabling accurate detection of connection states without requiring complex external verification equipment. The CVCs serve as intermediate structures that facilitate precise measurement of electrode-cell connections.
2Adaptability or versatility
If simple verification circuits are used, then the device structure is simple, but the ability to verify both cell-electrode and electrode-electrode connections is insufficient
Solution Approach 1:
The verification circuits (CVCs) are designed with multi-functionality to perform both cell-electrode connection verification and electrode-electrode connection verification. Each CVC can operate in different modes: verifying connections between cells and target electrodes, and verifying connections between adjacent electrodes. This universal design enables a single verification circuit structure to handle multiple verification tasks, increasing adaptability without proportionally increasing device complexity.
Solution Approach 2:
The verification device is segmented into multiple independent verification circuits, each associated with specific electrodes. By dividing the verification functionality into discrete segments (individual CVCs), the system can selectively activate only the verification circuits needed for specific connection types. This segmentation allows versatile verification capability while managing device complexity through modular, distributed verification units.
3Reliability
If external verification equipment is used, then connection verification can be performed, but the verification accuracy is affected by improper electrode formation and bubble interference
Solution Approach 1:
The verification circuits are designed to perform preliminary verification of electrode formation and connection integrity before actual experimental use. The CVCs can detect improper electrode formation and bubble interference in advance, allowing these issues to be identified and corrected before they affect the reliability of cell-electrode connections. This preliminary verification action enhances overall system reliability by preventing problematic conditions from compromising experimental results.
Solution Approach 2:
The MEA device performs self-verification through integrated verification circuits that are part of the device structure itself. Rather than relying on external equipment that may be affected by the same environmental factors (bubbles, improper electrode formation), the device uses its own internal CVCs to verify connections. This self-service approach isolates the verification process from external harmful factors, improving reliability by making the verification system immune to the same interference that affects external measurement equipment.
Data Source
AI summary
A verification device and a method of operating the verification device. The verification device includes: an electrode array including a plurality of electrodes configured to contact a culture medium for culturing a plurality of cells, and a plurality of analog front ends (AFEs) corresponding to the plurality of electrodes; and a control circuit including a plurality of first connection verifying circuits (CVCs) corresponding to the plurality of electrodes, wherein the control circuit is configured to verify at least one connection from among a plurality of first connections between the plurality of cells and the plurality of electrodes, and a plurality of second connections between the plurality of electrodes based on a result of verifying the plurality of first CVCs.