Overlapping Flow-Channel Cell Culture Chip for Accurate Resistance Sensing
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Solution Overview
Problem
Conventional organs-on-chips lack accuracy in evaluating cell states due to interference from varying electric resistance in culture media, leading to inaccurate measurements.
Innovation Solution
A cell culture chip design with overlapping flow channels and electrodes extending along each channel, reducing the influence of culture media resistance by minimizing the electrically-conducting distance and using a four-terminal system for more accurate electric resistance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OOC design with separate flow channels is used, then device simplicity is maintained, but measurement precision deteriorates due to interference from varying electric resistance in culture media
Solution Approach 1:
The patent merges the first and second flow channels to overlap at least partially when seen from an angle parallel with a predetermined direction, creating a configuration where the channels share common regions. This merging reduces the electrically-conducting distance through culture media while maintaining distinct functional zones for cell culture and measurement, thereby improving measurement precision without excessive complexity increase
Solution Approach 2:
The patent introduces electrodes that extend through the flow channels along the channel direction, adding a dimensional aspect to the measurement system. The first electrode extends through the first flow channel and the second electrode extends through the second flow channel, creating a multi-dimensional measurement approach that reduces interference from culture media resistance
2Measurement precision
If electrodes are placed to measure cell electric resistance, then cell evaluation capability is improved, but measurement accuracy deteriorates due to potential drops in culture media
Solution Approach 1:
The patent extracts the measurement function from the culture medium environment by using overlapping flow channels that reduce the electrically-conducting path through culture media. The electrodes are positioned to measure resistance primarily across the cell layer rather than through extensive culture media paths, effectively separating the measurement function from the harmful cultural media resistance
Solution Approach 2:
The overlapping flow channel configuration acts as an intermediary structure that minimizes the influence of culture media resistance. By reducing the electrically-conducting distance through culture media while maintaining proper electrode contact, the channel overlap serves as a mediator between the electrodes and the cell layer being measured
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 estimation of cell states through reduced potential drops and improved measurement accuracy, allowing for more accurate cell evaluation.
Implementation Method 1
the first electrode and the second electrode extend along the first flow channel and the second flow channel, respectively. In this way, the electric resistance of a cell sheet can be measured with a decrease in the electrically-conducting distance that electricity is conducted through fluids inside the first and second flow channels
Data Source
AI summary
A cell culture chip comprises a body having a first flow channel and a second flow channel at least part of which overlaps the first flow channel when seen from an angle parallel with a predetermined direction, a cell separation membrane having first and second principal surfaces facing away from each other, the cell separation membrane being disposed between the first flow channel and the second flow channel so that the first flow channel is located on the first principal surface and the second flow channel is located on the second principal surface, a first electrode which is in contact with the first flow channel and extending through the first flow channel along the first flow channel, and a second electrode which is in contact with the second flow channel and extending through the second flow channel along the second flow channel.