Microfabricated DSC Sensor for Precise Point-of-Care Biofluid Analysis

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Solution Overview

Problem

The high cost and specialized training requirements of existing differential scanning calorimetry (DSC) instruments hinder their application in clinical settings for disease diagnosis and monitoring.

Innovation Solution

A microelectromechanical system (MEMS) based DSC sensor system with a conductive heater trace, sample holder, and enclosure, designed for point-of-care use, allowing for the analysis of biofluids like plasma, saliva, and urine, and extending the scanning temperature range for broader applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional DSC instrumentation is used, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvethermodynamic measurement accuracyVSAvoidinstrumentation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the conventional DSC instrument into discrete functional modules: a microfabricated sensor chip for thermal measurement, a microfluidic sample holder for sample delivery, and a control system. This segmentation allows each component to be optimized independently and reduces overall system complexity while maintaining measurement precision through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces conventional mechanical heating and temperature sensing systems with a microfabricated heater trace and temperature sensor integrated on a substrate. This substitution of mechanical systems with microelectromechanical systems (MEMS) reduces device complexity and size while maintaining or improving measurement precision through better thermal coupling and reduced heat loss.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If conventional DSC instrumentation is used, then measurement precision is improved, but ease of operation deteriorates due to specialized training requirements

Engineering Contradiction:

Improvethermodynamic measurement accuracyVSAvoidoperational simplicity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent implements automated sample delivery through microfluidic channels that automatically transport samples from reservoirs to the measurement chamber. The system includes automated temperature scanning and data collection, reducing the need for manual operation and specialized training. The microfluidic system self-regulates sample flow and positioning, making the device easier to operate while maintaining precise measurements.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If conventional DSC instrumentation is used, then measurement precision is improved, but productivity deteriorates due to low experimental throughput

Engineering Contradiction:

Improvethermodynamic measurement accuracyVSAvoidexperimental throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent incorporates pre-heating chambers and automated sample preparation modules that prepare samples before they reach the measurement chamber. Samples are pre-loaded into microfluidic channels and pre-positioned for immediate measurement, reducing idle time between experiments. The system can rapidly cycle through multiple samples using automated microfluidic handling, significantly increasing experimental throughput while maintaining measurement precision.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If heater trace dimensions are reduced for miniaturization, then device complexity is reduced, but measurement precision may deteriorate

Engineering Contradiction:

Improvesensor sizeVSAvoidthermal measurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent uses thin-film heater traces and encapsulation layers with controlled thickness (50-1000 nm for heater trace, 1-10 μm for encapsulation) to achieve miniaturization while maintaining thermal measurement precision. The thin-film structure provides excellent thermal coupling between the heater and sample, reducing heat loss and improving measurement accuracy despite the reduced size. The encapsulation layer provides thermal insulation while maintaining a thin profile.

Inventive Principle:

Principle #30Flexible shells and thin films

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

Facilitates earlier, more accurate diagnosis of diseases like lupus and Lyme disease, and opens up new diagnostic possibilities for biofluids beyond plasma, enhancing clinical utility and research applications.

Implementation Method 1

a heater trace comprising a conductive material, on the substrate

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

an encapsulation layer, on the substrate and on the heater trace

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS12487200B2Microfabricated differential scanning calorimetry system and methods of use thereof

Publication Date: 2025.12.02 UNIVERSITY OF LOUISVILLE RESEARCH FOUNDATION INC

AI summary

A differential scanning calorimetry sensor, comprises a substrate; a heater trace comprising a conductive material, on the substrate; an encapsulation layer, on the substrate and on the heater trace; and a sample heating area, which is on the heater trace. The heater trace has a thickness of 50 to 1000 nm, a width of 1 to 100 pm, and a path length of 5 to 500 mm. Also described are a sample holder, a sensor enclosure and a thermal analysis sensor system.