Thermal Array for Portable PCR via Discrete Heating Zones
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Solution Overview
Problem
Conventional PCR devices are power-hungry and difficult to transport due to their large and heavy design, requiring significant electrical energy for thermal cycling and being limited to laboratory settings.
Innovation Solution
A low energy, high efficiency thermal array with a series of heater and cooling elements in tandem, directly contacting the sample vessel, allowing rapid thermal cycling by moving the sample vessel between heated elements, reducing the need for extensive temperature ramping and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PCR devices use large metal sample blocks for thermal conduction, then thermal cycling is achieved, but the device becomes power-hungry and difficult to transport
Solution Approach 1:
The patent divides the thermal array into multiple discrete heater elements (first heater element, second heater element, third heater element) positioned at different temperatures, replacing the conventional single large thermal block. This segmentation allows the sample vessel to be moved between discrete temperature zones rather than heating/cooling a massive block, dramatically reducing device weight while maintaining thermal cycling capability.
2Reliability
If conventional PCR devices continuously ramp temperature in a single block, then thermal cycling is achieved, but energy consumption is high
Solution Approach 1:
The patent pre-heats multiple heater elements to different target temperatures (first heater element at first temperature, second heater element at second temperature, third heater element at third temperature) before the thermal cycling process begins. This preliminary action allows the sample vessel to be rapidly moved between pre-prepared temperature zones, eliminating the need for continuous energy-intensive ramping of a single large thermal mass.
3Reliability
If conventional PCR devices are designed for laboratory use with standard outlets, then thermal cycling is reliable, but the device cannot be easily moved or used in field settings
Solution Approach 1:
The patent implements a dynamic thermal array where the sample vessel can be physically moved between multiple heater elements positioned at different temperatures. This dynamic approach replaces the static single-block design, enabling the device to be compact and portable while maintaining reliable thermal cycling through active repositioning of the sample between temperature zones.
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 thermal array enables rapid thermal cycling, reduces power consumption, and makes PCR devices portable and efficient, allowing for easy transportation and operation on batteries, suitable for point-of-care applications.
Implementation Method 1
The thermal array converts electrical energy into heat energy, and transfers it directly into the sample vessel
Implementation Method 2
maintaining the higher efficiency of heat transfer by conduction versus convection
Data Source
AI summary
Traditional thermocyclers are heating devices that change sample temperatures by adding heat energy into a sample block that is usually a large metal block and then extracting that heat energy out of the block in a process called ramping the temperature. Presented herein is a technology that eliminates the large mass sample block and ramping temperatures in a sample block and thus in a sample vessel. This design called a Thermal Array requires a fraction of the energy used to process a sample. In addition, the array allows a much smaller thermal cycler to be designed leading to portability of a device. This technology is designed to allow optimal polymerase chain reactions to be executed.