Thermochromic Sensing for Rapid Antibiotic Susceptibility Testing

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Solution Overview

Problem

Current susceptibility testing for antibiotics is time-consuming due to the need for multiple replication cycles before measurable effects can be detected, delaying the delivery of appropriate therapy to patients.

Innovation Solution

A method and system utilizing thermochromic materials in test vessels to detect spectral shifts in light, indicating energy conversion by live substances, allowing for real-time monitoring of bacterial growth and drug efficacy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional susceptibility testing methods are used, then accurate determination of drug effectiveness is achieved, but the testing time is excessively long due to multiple replication cycles required

Engineering Contradiction:

Improvedetermination accuracyVSAvoidtesting duration

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces traditional mechanical/optical measurement systems with thermochromic sensing that detects temperature changes through color shifts. The thermochromic material undergoes reversible color changes in response to temperature variations caused by metabolic activity, enabling real-time monitoring without requiring multiple replication cycles. This substitution of detection methodology resolves the contradiction by providing both rapid response and accurate measurement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent directly utilizes color changes of thermochromic materials as the detection mechanism. The thermochromic material exhibits reversible color transitions when exposed to temperature changes resulting from microbial metabolic activity. This color change provides a visual and measurable indicator of drug effectiveness in real-time, eliminating the need for prolonged incubation and multiple replication cycles while maintaining measurement accuracy.

Inventive Principle:

Principle #32Color changes

2Reliability

If traditional culturing methods are used, then reliable susceptibility results are obtained, but the time required for therapy delivery is delayed

Engineering Contradiction:

Improvesusceptibility testing reliabilityVSAvoidtherapy delivery speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements continuous monitoring of microbial metabolic activity through thermochromic sensing. The thermochromic material continuously changes color in response to temperature variations caused by ongoing metabolic processes. This continuous detection enables real-time assessment of drug effectiveness, providing reliable susceptibility results without requiring discontinuous sampling and replication cycles, thereby accelerating therapy delivery while maintaining reliability.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The patent introduces thermochromic material as an intermediary between the microbial culture and the detection system. The thermochromic material acts as a mediator that translates metabolic activity into visible color changes. This intermediary enables continuous, real-time monitoring of susceptibility without disrupting the microbial culture, ensuring reliable results while significantly reducing testing time and accelerating therapy delivery.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If multiple replication cycles are performed, then measurable drug effects are detected, but the testing process becomes time-consuming

Engineering Contradiction:

Improvedrug effect detectabilityVSAvoidreplication cycle time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent incorporates thermochromic material into the culture medium before initiating the susceptibility test. This preliminary incorporation ensures that the detection system is in place from the start, allowing immediate detection of metabolic activity and temperature changes. By having the sensing mechanism pre-positioned, the system can detect drug effects in real-time without requiring subsequent replication cycles, thus maintaining measurement precision while eliminating time delays.

Inventive Principle:

Principle #10Preliminary action

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 approach significantly reduces the time required for susceptibility testing, enabling quicker identification of effective antibiotic therapies by optically indicating temperature changes caused by energy conversion, thus accelerating the delivery of appropriate treatments.

Implementation Method 1

A spectral shift in light emanating from the thermochromic material of the test locations is detected. The spectral shift occurs in response to an increase or decrease in energy conversion by the live substance.

Methodology Applied

Scientific EffectThermochromism: Thermochromism

Data Source

PatentUS11718867B2Thermochromic sensing devices, systems, and methods

Publication Date: 2023.08.08 GENESEE VALLEY INNOVATIONS LLC

AI summary

One or more live substances is cultured at a plurality of test locations of a test vessel. The test locations include a thermochromic material and one or more test substances. A spectral shift in light emanating from the thermochromic material of the test locations is detected. The spectral shift occurs in response to an increase or decrease in energy conversion by the live substance. An effect of the one or more test substances on the live substances is determined based on the detected spectral shift.