Microfluidic Assay Chip with Retention Barriers for Tumor Microenvironment Simulation
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Solution Overview
Problem
Current in vitro models for evaluating immunotherapeutic agents, such as tumor-infiltrating lymphocytes (TILs), face challenges due to the lack of dynamic tumor microenvironment simulation and mechanical stress susceptibility of immune cells, limiting their effectiveness in preclinical testing.
Innovation Solution
A microfluidic assay system with a constant pressure pump, fluid reservoirs, and a microfluidic assay chip with retention barriers, which mimics the in vivo environment by perfusing fluid through tumor samples, allowing for the interaction of TILs with tumor fragments and monitoring their efficacy over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static in vitro models are used for evaluating immunotherapeutic agents, then device complexity is reduced, but the ability to simulate dynamic tumor microenvironment is insufficient
Solution Approach 1:
The system implements dynamic fluid flow through the microfluidic device, creating interstitial flow conditions that simulate the dynamic tumor microenvironment. This allows immune cells to interact with tumor fragments under physiologically relevant flow conditions, resolving the contradiction between simulation accuracy and device complexity by using controlled fluid dynamics rather than static configurations
Solution Approach 2:
The system uses a pressure-driven fluid flow system with reservoirs and microfluidic channels to create controlled interstitial flow through tumor fragments. This hydraulic approach enables dynamic microenvironment simulation while maintaining manageable device complexity through standardized microfluidic components
2Reliability
If traditional in vitro models are used, then ease of operation is improved, but mechanical stress susceptibility of immune cells limits effectiveness
Solution Approach 1:
The system controls flow rate parameters to maintain physiologically relevant shear stresses that preserve immune cell viability and function. By optimizing flow conditions rather than using static cultures, the system improves reliability for preclinical testing while maintaining operational simplicity through automated pressure-driven flow
3Measurement precision
If dynamic microenvironment simulation is implemented, then evaluation accuracy of therapeutic agents is improved, but system complexity increases
Solution Approach 1:
The system divides the evaluation process into separate functional modules: tumor fragment containment zones, immune cell introduction zones, and drug delivery zones within the microfluidic device. This segmentation enables accurate evaluation of therapeutic agent interactions while managing system complexity through modular design
Solution Approach 2:
The system creates localized microenvironments within the microfluidic device with specific flow conditions, oxygen gradients, and cell densities tailored to evaluate different aspects of therapeutic agent efficacy. This local quality approach improves measurement precision without requiring entire system complexity increases
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
This system effectively simulates the tumor microenvironment, enabling the rapid evaluation of TILs and other therapeutic agents, maintaining the integrity of immune cells and providing insights into tumor susceptibility and drug efficacy, thereby improving the screening of cancer therapies.
Implementation Method 1
a constant pressure pump, fluid reservoirs, and a microfluidic assay chip with retention barriers, which mimics the in vivo environment by perfusing fluid through tumor samples
Implementation Method 2
a retention barrier located within the assay channel configured to trap a tissue fragment sample such that the fluid and solute perfuses through the tissue fragment sample
Data Source
AI summary
Systems and methods for conducting assays on tissue fragment samples including providing a suspension maintaining pump, and a plurality of fluid reservoirs, wherein the fluid reservoirs are configured to hold a volume of fluid. The fluid reservoirs are fluidically coupled to a microfluidic assay chip, wherein the microfluidic assay chip includes a plurality of parallel assay channels, a first inlet port for introduction of a tissue fragment sample into the microfluidic assay ship, and a second inlet port coupled to the fluid reservoir. Each channel of the microfluidic assay chip also includes a retention barrier configured to trap the tissue fragment sample such that the fluid perfuses through the tissue sample, as well as an outlet port fluidically coupled to a waste receptacle.