Cell Retainer Surface Layout for Cell Suspension Spread Control
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Solution Overview
Problem
Existing cell retainers face challenges in controlling the spread and thickness of cell layers formed on measuring surfaces, necessitating precise adjustment of the drop area to ensure accurate measurement of extracellular potentials.
Innovation Solution
A cell retainer with a measuring surface featuring concentrically arranged regions of varying contact angles, including working and reference electrodes, and first and second regions with specific contact angle differences, allowing for controlled spread and thickness adjustment of cell suspensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the drop area of cell suspension is increased, then the cell layer thickness is reduced, but the measurement precision deteriorates due to insufficient cell coverage on working electrodes
Solution Approach 1:
The measuring surface is divided into regions with different contact angles: a first region with a larger contact angle to restrict suspension spread and a second region with a smaller contact angle to promote uniform cell distribution. This local differentiation allows simultaneous control of cell layer thickness and coverage quality on working electrodes.
Solution Approach 2:
The measuring surface is segmented into multiple functional zones including a work region with working electrodes, a reference electrode region, and intermediate regions with varying contact angles. This segmentation enables independent optimization of each zone for its specific function while maintaining overall system performance.
2Manufacturing precision
If the drop area of cell suspension is decreased, then the cell layer thickness is increased, but the coverage area of working electrodes is reduced
Solution Approach 1:
Different regions of the measuring surface are assigned different contact angle properties: the first region has a larger contact angle to limit suspension spread and increase thickness, while the second region has a smaller contact angle to ensure adequate coverage of working electrodes, thus resolving the contradiction between thickness and coverage area.
3Device complexity
If the cell suspension spread is allowed to extend to the reference electrode, then the device complexity is reduced, but the measurement precision deteriorates due to interference with reference electrode measurements
Solution Approach 1:
The region surrounding the reference electrode is designed with a larger contact angle to act as a barrier, preventing cell suspension from reaching the reference electrode. This localized modification protects the reference electrode measurement accuracy without requiring complete structural redesign of the entire device.
Solution Approach 2:
An intermediate region with specific contact angle properties is introduced between the work region and the reference electrode region. This intermediate zone acts as a mediator that guides suspension spread away from the reference electrode while maintaining simplicity in the overall device structure.
4Adaptability or versatility
If multiple first regions are provided in tiers, then the adaptability for selecting different drop areas is improved, but the device complexity increases
Solution Approach 1:
The measuring surface is segmented into multiple tiers of first regions, each with progressively larger areas and different contact angles. This segmentation provides discrete selectable options for drop areas, enabling adaptability for different experimental requirements while maintaining a structured and manageable device design.
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
Enables precise control over the drop region and area of cell suspensions, resulting in isotropic thickness of cell layers for enhanced measurement accuracy.
Implementation Method 1
A contact angle in the plurality of first regions is greater than a contact angle in the work region and a contact angle in the second region
Data Source
AI summary
A cell retainer has a measuring surface that includes a work region in which a plurality of working electrodes are arranged, a reference electrode arranged outward of the work region, a plurality of first regions provided between the work region and the reference electrode, and a second region arranged between each two of the first regions, the two being adjacent to each other in a radial direction. A contact angle in the first region is greater than a contact angle in the work region and a contact angle in the second region. Thus, any of the first regions arranged outward of the work region or the second region serves to restrict the spread of a cell suspension. Moreover, the first regions arranged in multiple tiers enable selection of a drop region and a drop area from a plurality of drop regions and a plurality of drop areas.