Stacked Organ Chip Assembly for BBB Permeability Testing
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Solution Overview
Problem
Existing in vitro models for simulating the blood-brain barrier (BBB) face challenges in accurately replicating the physiological environment, leading to insufficient drug delivery to the brain and suboptimal therapeutic outcomes for neurological disorders due to the BBB's selective permeability.
Innovation Solution
A microfluidic organ chip assembly comprising stacked PDMS components with integrated barriers and an enclosure, which simulates the BBB environment by replicating fluid flow dynamics and mechanical signals, allowing for real-time monitoring of drug permeability and efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a membrane is inserted into the microfluidic channel to simulate BBB, then the barrier function is improved, but the device complexity increases
Solution Approach 1:
The microfluidic device is divided into separate components: a first microfluidic component with a first channel, a second microfluidic component with a second channel, and a third microfluidic component with a third channel. The membrane is inserted into the second channel, allowing independent assembly and optimization of each component while maintaining the overall barrier function.
Solution Approach 2:
The membrane is nested within the second microfluidic channel, which is positioned between the first and third microfluidic components. This nested arrangement allows the membrane to be integrated into the microfluidic structure without requiring separate housing, thereby managing complexity while maintaining barrier functionality.
2Reliability
If multiple microfluidic components are stacked and combined, then the physiological environment simulation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The device is segmented into multiple microfluidic components that can be manufactured separately with standard precision, then assembled together. Each component has dedicated channels (first, second, and third channels) that align with the membrane, allowing for modular manufacturing that reduces the precision requirements compared to a monolithic structure.
Solution Approach 2:
The membrane serves as an intermediary element between the first and third microfluidic components. It is inserted into the second channel and provides a reference surface for alignment, facilitating the assembly of multiple components with acceptable precision while maintaining the simulated physiological environment.
3Measurement precision
If the membrane is positioned between fluid channels, then the drug permeability testing is improved, but the fluid flow dynamics become more complex
Solution Approach 1:
The fluid flow system is segmented into distinct channels: a first microfluidic channel for delivering fluid to the membrane, a second microfluidic channel for receiving fluid from the membrane, and a third microfluidic channel for additional fluid management. This segmentation allows for controlled and measurable permeability while managing flow dynamics through separate pathways.
Solution Approach 2:
The membrane acts as an intermediary barrier between the first and second microfluidic channels, enabling precise measurement of drug permeability. The third microfluidic channel provides additional fluid management capability, helping to control and simplify the overall flow dynamics while maintaining accurate permeability testing.
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 microfluidic apparatus effectively addresses the challenges of existing technologies by providing a microfluidic apparatus for simulating the physiological barrier environment, enhancing the reliability and efficacy of the BBB.
Implementation Method 1
a membrane, wherein a first surface of the membrane and a second surface opposite the first surface are both populated with cells... providing a first fluid into the upper microfluidic channel, wherein the first fluid immerses the cells on the first surface of the membrane; and providing a second fluid into the lower microfluidic channel, wherein the second fluid immerses the cells on the second surface of the membrane
Data Source
AI summary
An organ chip assembly for simulating physiological barrier environment provided. The organ chip assembly includes a first microfluidic component having a first microfluidic channel, a second microfluidic component having a second microfluidic channel, wherein the second microfluidic channel is configured to receive a membrane and a third microfluidic component having a third microfluidic channel. The first microfluidic component, the second microfluidic component, and the third microfluidic component are configured to be combined. When combined, the second microfluidic component is positioned between the first microfluidic component and the third microfluidic component, such that the first microfluidic channel of the first microfluidic component faces the second microfluidic component and comprises a first portion configured to substantially align with and connect to the second microfluidic channel of the second microfluidic component, and the third microfluidic channel of the third microfluidic component faces the second microfluidic component and comprises a second portion configured to substantially align with and connect to the second microfluidic channel of the second microfluidic component.