Thermal Sensor Array for Nucleic Acid Detection
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Solution Overview
Problem
Current nucleic acid sequencing technologies face limitations in throughput and cost due to the need for large flow cells, high-precision optics, and expensive lasers for fluorescence signal detection, which are constrained by the Rayleigh criterion and diffraction-limited optical imaging.
Innovation Solution
A detection device comprising a fluidic channel with a plurality of temperature sensors and an insulating material, where the temperature sensors detect temperature changes caused by magnetic nanoparticles (MNPs) in the presence of an alternating magnetic field, allowing for the detection of molecules such as nucleic acids without the need for fluorescence-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence-based optical detection is used for nucleic acid sequencing, then molecule detection can be achieved, but the system requires large flow cells, high-precision optics, and expensive lasers, increasing device complexity and cost
Solution Approach 1:
The patent replaces the optical detection system with a thermal detection system. Instead of using fluorescence-based optical methods requiring lasers and precision optics, the invention uses temperature sensors to detect heat changes caused by magnetic nanoparticles during nucleic acid sequencing. This substitution eliminates the need for complex optical components while maintaining detection capability.
Solution Approach 2:
The invention changes the detection parameter from optical (fluorescence) to thermal (temperature). By measuring temperature changes rather than light emission, the system avoids the limitations of optical diffraction and eliminates the need for high-NA lenses and super-resolution imaging techniques.
2Productivity
If inward scaling is applied to increase DNA testing site density, then throughput can be improved, but the Rayleigh criterion limits the minimum distance between sequenced DNA strands to approximately 400 nm
Solution Approach 1:
The patent replaces optical detection with thermal detection to overcome the Rayleigh criterion limitation. Since thermal sensors do not rely on optical diffraction limits, they can detect signals from much closer-spaced DNA strands, enabling higher testing site density and improved throughput without being constrained by the 400 nm minimum distance.
3Productivity
If outward scaling is applied to increase flow cell size and number of sequenced DNA strands, then throughput can be improved, but the cost of reagents and system increases
Solution Approach 1:
The invention replaces expensive optical detection infrastructure with cost-effective thermal sensors. This substitution allows for increased throughput by adding more sensing sites without proportionally increasing reagent consumption or system cost, as thermal sensors can be densely integrated without the optical resolution constraints that limit flow cell scaling.
4Productivity
If high-precision free-space imaging optics are used to achieve 20 billion reads per run, then throughput can be improved, but the system requires expensive high-power lasers and high-precision nano-positioners
Solution Approach 1:
The patent replaces the entire optical imaging system including high-power lasers, high-precision nano-positioners, and free-space imaging optics with a thermal sensor array. This substitution dramatically simplifies the system architecture while maintaining high throughput capability, as thermal sensors can be statically positioned and read out electronically without requiring complex mechanical scanning or high-power optical components.
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 enables efficient and cost-effective molecule detection by overcoming the limitations of optical detection methods, allowing for simultaneous detection of all four DNA bases in a single chemistry step and significantly speeding up sequencing without reducing read error rates.
Implementation Method 1
detect, in the presence of an alternating magnetic field, a temperature change indicating the presence or the absence of one or more magnetic nanoparticles (MNPs)
Implementation Method 2
an insulating material encapsulating the plurality of temperature sensors and for providing a barrier between the plurality of temperature sensors and contents of the at least one fluidic channel
Data Source
AI summary
Disclosed herein are methods of using detection devices. A detection device comprises a fluidic channel configured to receive a plurality of molecules to be detected, a plurality of temperature sensors, and an insulating material encapsulating the plurality of temperature sensors and providing a barrier between the plurality of temperature sensors and contents of the fluidic channel. A surface of the insulating material within the fluidic channel provides a plurality of sites for binding the plurality of molecules to be detected. Each of the plurality of temperature sensors is configured to detect, in the presence of an alternating magnetic field, a temperature change indicating presence or absence of one or more magnetic nanoparticles (MNPs) coupled to at least one of the plurality of molecules to be detected at a respective subset of the plurality of sites.