Microfluidic Microchamber Platform for Antibiotic Susceptibility Testing
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Solution Overview
Problem
Conventional antibiotic susceptibility testing (AST) methods are time-consuming, labor-intensive, and prone to handling errors, requiring large amounts of expensive antibiotics, which limits their sensitivity and increases the risk of selecting resistant bacterial traits due to indiscriminate use of broad-spectrum antibiotics.
Innovation Solution
A multi-volume microchamber-based microfluidic platform (EL-MVM2) that creates a precise antibiotic concentration gradient within microchambers, allowing for high-throughput AST assays using a small amount of antibiotic, reducing operation complexity and minimizing human error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional AST methods (broth microdilution, Kirby-Bauer disk diffusion) are used, then comprehensive antibiotic susceptibility testing can be performed, but the assays are time-consuming, labor-intensive, and require large amounts of expensive antibiotics
Solution Approach 1:
The invention divides the AST assay into multiple independent microchambers (e.g., 96 wells) on a single chip, each capable of testing different antibiotic concentrations simultaneously. This segmentation enables parallel processing of multiple samples and conditions, reducing overall assay time from days to hours while maintaining comprehensive testing capability
Solution Approach 2:
The invention transitions from conventional two-dimensional (flat plate) AST testing to three-dimensional microchamber structures with varying volumes. This dimensional change allows creation of precise antibiotic concentration gradients within each chamber, enabling more accurate MIC determination and reducing the amount of antibiotic needed while maintaining assay precision
2Measurement precision
If conventional AST methods are used, then susceptibility testing can be performed, but enormous amounts of expensive antibiotics are required for each test
Solution Approach 1:
The total antibiotic quantity is segmented across many small microchambers, each requiring only nanoliter amounts of antibiotic. The sum of antibiotic used in all chambers is dramatically less than conventional methods, yet the collective data from all chambers provides comprehensive susceptibility information across multiple concentrations
Solution Approach 2:
Each microchamber is designed with specific volume characteristics to create local antibiotic concentration gradients. This local quality optimization ensures precise concentration control in each chamber, maintaining accurate susceptibility determination while minimizing total antibiotic usage through efficient local utilization
3Speed
If broad-spectrum antibiotics are used indiscriminately to treat infections, then immediate therapeutic effect can be achieved, but the risk of selecting resistant bacterial traits increases
Solution Approach 1:
The invention performs preliminary AST testing on bacterial isolates before initiating definitive antibiotic therapy. By rapidly determining which antibiotics are effective against the specific pathogen, clinicians can prescribe targeted narrow-spectrum antibiotics from the start, avoiding indiscriminate broad-spectrum use and reducing resistance selection pressure while still achieving timely treatment
4Adaptability or versatility
If conventional AST assays are performed manually, then flexibility in testing different conditions is maintained, but handling errors and labor intensity increase
Solution Approach 1:
The microfluidic device incorporates integrated fluid handling channels that automatically distribute antibiotics and samples to appropriate microchambers based on pre-programmed protocols. This self-service automation eliminates manual pipetting errors while maintaining the flexibility to test different antibiotic combinations and concentrations by simply changing digital parameters rather than physical procedures
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 EL-MVM2 platform enables rapid and accurate AST assays, predicting susceptibility/resistance outcomes with high accuracy and reducing antibiotic consumption, while maintaining the simplicity of operation, thus addressing the limitations of conventional methods.
Implementation Method 1
creates a precise antibiotic concentration gradient within microchambers
Data Source
AI summary
The present disclosure relates to a microfluidic circuit comprising an inlet port; an outlet port; a main channel fluidically connecting the inlet port and the outlet port; and a series of microchambers of differing volumes disposed within the main channel, where each microchamber is individually fluidically connected to the main channel via individual microchamber openings. The present disclosure also relates to a microfluidic device comprising a support layer; a substrate layer disposed on the support layer; and one or more microfluidic circuits of the present disclosure, where the one or more circuits are disposed within the substrate layer. Also disclosed is a method for performing an assay.