Hybrid MEA-IDE Sensor Array for Simultaneous Cardiac Tissue Measurement
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Solution Overview
Problem
Conventional cardiac tissue platforms are unable to simultaneously measure electrophysiological and contractility responses of tissue cultures in a high-throughput manner, lacking the ability to detect location-specific action potentials and quantify contraction force, which limits their effectiveness in evaluating cardiological impact of drug candidates.
Innovation Solution
A sensor array system incorporating an interpenetrating arrangement of multi-electrode arrays (MEAs) and interdigitized electrodes (IDEs) on a substrate, allowing for simultaneous measurement of electrophysiological and contractility responses, along with optical observation of cell morphology, enabling real-time data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-electrode arrays (MEAs) are used to detect location-specific action potentials with high spatial resolution, then measurement precision of electrophysiological responses is improved, but the ability to measure contractility is lost
Solution Approach 1:
The patent combines MEA and IDE technologies into a single hybrid sensor array platform. The MEA component provides high spatial resolution electrophysiological measurements through multiple electrodes, while the IDE component enables contractility measurements through interdigitated electrode structures. This merging allows simultaneous measurement of both electrophysiological and mechanical responses from the same tissue sample.
Solution Approach 2:
The hybrid sensor array is designed to perform multiple functions: it can measure field potentials (electrophysiology), detect tissue contractions (mechanics), and monitor morphology changes. This multi-functional capability eliminates the need for separate measurement systems and enables comprehensive cardiac tissue evaluation from a single platform.
2Measurement precision
If interdigitated electrodes (IDEs) are used to maximize conversion of mechanical movement to electrical signals for contractility measurement, then sensitivity to mechanical response is improved, but visualization of cell morphology is limited due to large-area opaque metal electrodes
Solution Approach 1:
The patent applies local quality by making the electrode structures optically transparent or minimally invasive in specific regions. The IDEs are designed with transparent substrates or minimal metal coverage in areas where morphological visualization is needed, while maintaining sufficient electrode area for accurate mechanical signal detection. This allows simultaneous optical observation and electrical measurement without mutual interference.
3Force
If conventional contractility measurement systems use large-area opaque metal electrodes to detect tissue contractions, then force detection capability is improved, but the ability to detect location-specific action potentials is lost
Solution Approach 1:
The patent segments the electrode structure into distinct functional zones: MEA electrodes for electrophysiological detection, IDE structures for mechanical force measurement, and transparent regions for optical visualization. This segmentation allows each component to perform its specialized function without interfering with the others, enabling simultaneous measurement of action potentials, contractions, and morphology.
4Measurement precision
If separate measurement systems are used for electrophysiology and contractility, then measurement precision of individual parameters is improved, but device complexity and time consumption are increased
Solution Approach 1:
The patent merges electrophysiological and mechanical measurement capabilities into a single integrated sensor array. The hybrid platform combines MEA and IDE technologies in one device, allowing simultaneous measurement of multiple parameters from the same tissue sample without requiring separate experimental setups.
Solution Approach 2:
The system enables continuous simultaneous measurement of electrophysiological and mechanical responses throughout the experiment. Both measurement modalities operate concurrently and continuously, providing real-time data on tissue function without interruption or sequential switching between different measurement systems.
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 system provides comprehensive, real-time evaluation of electrophysiological and contractility responses, enhancing the ability to assess cardiological impact of substances, particularly drug candidates, with improved spatial resolution and force quantification.
Implementation Method 1
multi-electrode arrays (MEAs) for mapping extracellular action potentials
Implementation Method 2
interdigitated electrodes (IDEs) for measuring beating and viability
Data Source
AI summary
A method includes simultaneously measuring electrophysiological responses and contractility responses of a plurality of cells forming a tissue culture using a system comprising a sensor array configured to simultaneously measure the electrophysiological responses and the contractility responses of the plurality of cells forming the tissue culture. Fabrication techniques for making such systems include: forming a sensor array comprising an interpenetrating arrangement of IDEs and electrodes of a MEA in or on a substrate surface; forming a plurality of contacts for interfacing the system with one or more external devices in or on the substrate surface; and forming leads between the plurality of contacts and the sensor array.