PDMS Patch-Clamp Chip for High-Throughput Electrophysiology
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Solution Overview
Problem
Conventional patch-clamp techniques require highly skilled operators, are limited by low throughput, and lack versatility, especially in achieving excised patch configurations, due to the need for complex and costly equipment, and are not suitable for high-throughput data collection or simultaneous measurements on multiple cell types.
Innovation Solution
A patch-clamp chip composed of multiple layers of poly-dimethylsiloxane (PDMS) with microfluidic channels and electrodes, allowing for high-throughput electrophysiological measurements in various configurations, including excised patch, whole-cell, and cell-attached modes, without the need for micromanipulators or microscopes, enabling direct cell culture and simultaneous recordings on multiple sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional patch-clamp techniques are used, then high measurement precision can be achieved, but device complexity and operational difficulty increase significantly
Solution Approach 1:
The device is segmented into multiple functional layers including a substrate layer, microfluidic channel layer, and cell culture layer, each performing specific functions. This segmentation allows complex electrophysiological measurements to be achieved through simpler, modular components rather than a single complex apparatus.
Solution Approach 2:
The patent replaces manual mechanical micromanipulation with automated electrical field application through electrodes. The mechanical process of forming seals and positioning pipettes is substituted with electrical field-based cell membrane isolation and automated measurement, reducing operational complexity while maintaining precision.
2Measurement precision
If conventional patch-clamp techniques are used, then high measurement precision can be achieved, but productivity remains low
Solution Approach 1:
The chip is divided into multiple independent recording sites across different layers, allowing simultaneous measurements at multiple locations. This segmentation enables parallel data collection, significantly increasing productivity while each individual measurement site maintains the precision of conventional patch-clamp techniques.
Solution Approach 2:
Cells are pre-cultured on the chip surface in their native adherent state before measurements begin. This preliminary action eliminates the time-consuming cell suspension and loading steps required in conventional methods, enabling immediate high-throughput measurements without compromising measurement precision.
3Adaptability or versatility
If conventional patch-clamp techniques are used, then versatility in measurement configurations can be achieved, but ease of operation deteriorates
Solution Approach 1:
The device provides universal access to multiple patch-clamp configurations (cell-attached, whole-cell, excised patch) through a single standardized platform. Different measurement modes are achieved by applying different electrical field parameters and microfluidic conditions, eliminating the need for multiple specialized devices and reducing operational complexity.
Solution Approach 2:
The patent replaces skill-intensive manual techniques with automated electrical field application and microfluidic control. The complex mechanical maneuvers required for different configurations are substituted with programmable electrical signals and fluid flow control, making versatile measurements accessible to operators with minimal training.
4Measurement precision
If conventional patch-clamp techniques are used, then measurement quality can be maintained, but loss of time increases due to manual manipulation
Solution Approach 1:
Cells are pre-cultured directly on the chip in their functional adherent state, and multiple recording sites are pre-positioned across different layers. This preliminary preparation eliminates time-consuming manual cell handling and positioning during measurements, significantly reducing procedure time while maintaining data quality through controlled cultural conditions.
Solution Approach 2:
The patent replaces slow manual micromanipulation with rapid automated electrical field application and microfluidic switching. Electrical fields can be applied and reconfigured instantaneously compared to manual pipette manipulation, enabling fast transitions between different measurement configurations without compromising data quality.
5Measurement precision
If conventional patch-clamp techniques are used, then high measurement precision can be achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple functions (cell culture, microfluidic control, electrical recording, and optical access) into a single integrated chip structure. This consolidation eliminates the need for separate assemblies of micromanipulators, microscopes, and environmental chambers, reducing overall device complexity and cost while maintaining measurement precision through coordinated functional integration.
Solution Approach 2:
The single chip platform provides universal access to all patch-clamp configurations and cell types, replacing the need for multiple specialized devices. This multi-functionality reduces the total equipment inventory and assembly complexity required to achieve comprehensive electrophysiological measurement capabilities with high precision.
Data Source
AI summary
There is a described a patch-clamp chip for making electrical measurements on a biological sample. The patch-clamp chip comprising a plurality of layers comprising poly-dimethylsiloxane (PDMS) forming a stack. It comprises at least a chip surface layer comprising an aperture formed therethrough and which upwardly opens on the surface, where the biological sample is provided. A microfluidic channel layer comprising PDMS extends below the plane of the chip surface layer and comprises a microfluidic channel formed therein. The aperture of the chip surface layer downwardly opens on the microfluidic channel. Electrophysiological measurements are made between an internal solution in the microfluidic channel and the external solution on the chip surface. The measurements can be performed via a bottom electrode. A plurality of apertures and corresponding microfluidic channels can be provided to perform simultaneous measurements on a plurality of samples, independently.