Fluidic Cartridge Reader Layout for PCR Thermal Isolation
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Solution Overview
Problem
Conventional diagnostic systems face challenges in handling small sample volumes in microfluidic devices, with limitations in complexity, sensitivity, and signal generation, making it difficult for local GP surgeries to perform tests like PCR assays efficiently and reliably.
Innovation Solution
A cartridge reader system with a fluidic cartridge design that includes a thermal module, pneumatic module, mechanical actuators, electrical interface, and barcode reader, separated by thermally insulated zones to manage thermal interference and enhance signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a microfluidic device is used to reduce sample volume and simplify the device, then the device size and sample requirement are reduced, but the complexity of interfacing to small channels and features increases and sensitivity is reduced
Solution Approach 1:
The device is segmented into distinct functional zones (thermal zone, non-thermal zone, fluidic channels) that are spatially separated. This allows the small-scale microfluidic channels to be isolated from the large-scale interfacing components, making both the small channel handling and external interfacing easier while maintaining reduced sample volume requirements.
2Volume of moving object
If a microfluidic device is used to reduce sample volume and simplify the device, then the device size and sample requirement are reduced, but the sensitivity of detection is reduced
Solution Approach 1:
Different regions of the device have specialized properties optimized for their function: the thermal zone contains heating elements for PCR amplification to enhance sensitivity, while the fluidic channels are designed with specific geometries to maximize sample-reagent interaction. This local optimization allows the device to maintain high detection sensitivity despite using small sample volumes.
3Adaptability or versatility
If a thermal module is added to perform PCR assays on the cartridge, then the diagnostic capability is improved, but thermal interference with other modules increases
Solution Approach 1:
The thermal module is spatially extracted and isolated from other sensitive modules in the device. By placing the thermal zone in a separate location with thermal insulation, the harmful thermal effects are contained within that zone, preventing interference with the pneumatic, mechanical, and electrical modules while maintaining the ability to perform PCR assays.
4Adaptability or versatility
If multiple modules (thermal, pneumatic, mechanical, electrical) are integrated in the cartridge reader, then the functionality and diagnostic capability are improved, but thermal interference between modules increases
Solution Approach 1:
The cartridge reader is segmented into distinct thermal and non-thermal zones, with each module placed in an appropriate zone based on its thermal sensitivity. The thermal module is isolated in the thermal zone, while pneumatic, mechanical, and electrical modules are placed in the non-thermal zone. This spatial segmentation allows multiple functions to be integrated without thermal interference between modules.
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
Enables reliable performance of complex diagnostic tests, such as PCR assays, in local settings by improving signal generation and reducing thermal interference, facilitating efficient sample processing and result reading.
Implementation Method 1
a thermal module comprised in the lower clamp, wherein the thermal module comprises at least one thermal stack for heating the at least one sample processing region of the cartridge inserted into the reader
Implementation Method 2
a pneumatic module comprising a plurality of pneumatic interface ports for coupling to the pneumatics interface of the cartridge inserted into the reader, a first pump configured to supply one or more positive pressures to one or more of the pneumatic interface ports
Implementation Method 3
The channels forming such microfluidics devices handle small fluid volumes and are connected together so as to achieve a desired function such as mixing of a sample, moving the sample through the device
Data Source
AI summary
Instrument for performing a diagnostic test on a fluidic cartridge A cartridge reader is for carrying out a diagnostic test on a sample contained in a fluidic cartridge inserted into the reader. The fluidic cartridge comprises a fluidic layer comprising at least one sample processing region, at least one collapsible blister containing a liquid reagent, a pneumatic interface, an electrical interface and at least one mechanical valve. The reader comprises a housing; an upper clamp occupying a fixed position relative to the reader, and a lower clamp, movable relative to the first clamp, wherein the upper clamp and the lower clamp define a cartridge receiving region therebetween. The reader comprises a thermal module comprised in the lower clamp, wherein the thermal module comprises at least one thermal stack for heating the at least one sample processing region of the cartridge inserted into the reader. The reader comprises at least one mechanical actuator for actuating the mechanical valve comprised in the cartridge inserted into the reader.