Antibiotic Susceptibility Testing via Bacterial Immobilization in Gel Matrix
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional antibiotic susceptibility testing methods are time-consuming, typically requiring 16-24 hours, and cannot monitor changes in single bacterial cells or motile cells in real-time, which is inadequate for rapid treatment of sepsis, and they often differ from in vivo environments due to the use of solid or liquid media.
Innovation Solution
A rapid antibiotic susceptibility testing method involving the immobilization of microbes in a gelling agent-based solid thin film, allowing bioactive agents to diffuse and be imaged, with the minimum inhibitory concentration (MIC) determined through image analysis, using microfluidic channels or microplates for efficient diffusion and observation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional turbidity measurement methods are used to determine bacterial growth, then statistical results can be obtained, but the testing time is extended to 16-24 hours
Solution Approach 1:
The patent uses digital imaging to capture and analyze bacterial colony formations as visual copies, replacing the need for long incubation periods required by turbidity measurement methods. The imaging system creates visual records of bacterial growth that can be analyzed immediately, eliminating the 16-24 hour waiting period while maintaining statistical accuracy through image analysis of multiple colonies.
2Adaptability or versatility
If a large number of agar medium plates are used to test multiple antibiotics, then comprehensive susceptibility testing can be performed, but the device complexity and labor requirements increase
Solution Approach 1:
The patent employs a single multi-well plate system that can simultaneously test multiple antibiotics against the same bacterial culture. Each well can receive different antibiotic treatments, allowing comprehensive susceptibility testing in one device rather than requiring multiple separate agar plates. This universal platform reduces device complexity while maintaining the ability to test various drugs.
Solution Approach 2:
The patent combines multiple antibiotic testing functions into a single integrated microplate system. Instead of using separate agar plates for each antibiotic, the system merges all drug susceptibility tests into one plate with multiple wells, each capable of receiving different antibiotics. This consolidation reduces the total number of devices needed and simplifies the overall testing process.
3Ease of manufacture
If conventional solid or liquid media are used for bacterial testing, then standard AST procedures can be followed, but the results differ from in vivo environments
Solution Approach 1:
The patent modifies the physical state parameter of the culture medium by using a semi-solid agarose-based gel instead of conventional liquid or solid media. This parameter change creates a more viscous environment that better mimics in vivo conditions while still allowing standardized AST procedures to be performed. The gel matrix provides structural support similar to tissue environments, improving the correlation between in vitro test results and in vivo outcomes.
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 method significantly reduces the time required for antibiotic susceptibility testing to 3-4 hours, allowing for rapid tracking of single cell growth and accurate MIC determination, while minimizing the amount of drugs and cells needed, and provides results comparable to conventional methods.
Implementation Method 1
providing a mixture solution of a gelling agent and a microbe to a gelling device; solidifying the mixture solution to form a solid thin film in which the microbe is immobilized
Implementation Method 2
supplying a bioactive agent to the solid thin film and allowing the bioactive agent to diffuse into the solid thin film
Data Source
AI summary
A testing method is disclosed. The testing method includes: providing a mixture solution of a gelling agent and a microbe to a gelling device; solidifying the mixture solution to form a solid thin film in which the microbe is immobilized; supplying a bioactive agent to the solid thin film and allowing the bioactive agent to diffuse into the solid thin film; and imaging the individual responses of the single microbial cells to the bioactive agent, and determining the minimum inhibitory concentration (MIC) of the bioactive agent based on the analysis of the images to obtain AST results.