Fluidic Cartridge Thermal-Optical Layout for Uniform Reaction Heating
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Solution Overview
Problem
Existing assay procedures in fluidic cartridges face challenges due to interference between thermal devices and optical devices, leading to temperature gradients and inconsistent test results, as thermal devices are typically placed on one wall of the reaction chamber, preventing simultaneous optical signal detection.
Innovation Solution
A dual thermal module assembly with movable thermal elements and integrated optical fibers that allow for precise thermal control and optical signal transmission through aligned thermal blocks, enabling simultaneous thermal energy application and optical signal detection without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal device is placed in contact with one wall of the reaction chamber, then thermal energy can be applied to the reaction mixture, but a temperature gradient is created within the reaction chamber leading to inaccurate test results
Solution Approach 1:
The thermal management system is segmented into multiple independent thermal devices, each contacting different walls of the reaction chamber. This allows independent control of thermal zones to eliminate temperature gradients while maintaining heating effectiveness.
Solution Approach 2:
Different walls of the reaction chamber are assigned different thermal characteristics through localized thermal devices. Each wall can be independently controlled to achieve uniform temperature distribution throughout the reaction mixture, preventing temperature gradients that would compromise test accuracy.
2Temperature
If a thermal device is placed in contact with one wall of the reaction chamber, then thermal control is achieved, but an optical device cannot be placed in contact with the same wall for signal detection
Solution Approach 1:
The reaction chamber walls are segmented into distinct functional zones: thermal contact walls for heating/cooling and optical contact walls for signal detection. This spatial segmentation allows simultaneous operation of thermal and optical devices without interference, enabling both precise thermal control and accurate optical measurement.
Solution Approach 2:
The system transitions from a single-wall contact configuration to a multi-dimensional arrangement where thermal and optical devices contact different walls of the reaction chamber. This dimensional expansion allows both device types to operate simultaneously without spatial conflict, resolving the interference problem.
3Reliability
If thermal devices are placed on both opposed walls of the reaction chamber to minimize temperature gradient, then temperature uniformity is improved, but the ability of detectors to detect optical emission signals is interfered with
Solution Approach 1:
The reaction chamber is segmented into distinct thermal and optical zones, with specific walls designated for thermal device contact and other walls for optical device contact. This segmentation allows thermal devices to be placed on opposed walls for temperature uniformity while optical devices remain unobstructed on different walls for signal detection.
Solution Approach 2:
The reaction chamber serves multiple functions through its different walls: some walls are optimized for thermal contact to achieve temperature uniformity, while other walls are optimized for optical contact to enable signal detection. This multi-functionality allows the single reaction chamber to simultaneously achieve both temperature control and optical measurement without compromise.
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 solution ensures consistent thermal management and accurate optical signal detection by minimizing temperature gradients and allowing for precise fluidic operations within fluidic cartridges.
Implementation Method 1
an optical fiber associated with each through hole extending through the thermal block of each thermal assembly of the first thermal module to transmit an optical signal through each thermal block of the first thermal module
Implementation Method 2
a thermal element; and a thermal block associated with the thermal element, wherein the thermal block has an exposed contact surface... in thermal contact
Data Source
AI summary
Controlling a syringe pump having an elastomeric stopper and a syringe plunger connected to the stopper includes operating a motor coupled to the plunger to move the syringe plunger and the stopper toward a bottom wall of a syringe barrel, monitoring a motor demand signal of the motor, detecting an inflection in the motor demand signal that indicates that the stopper has contacted the bottom wall of the syringe barrel, after detecting the inflection, continuing to operate the motor until the motor stalls, after detecting the inflection and until the motor stalls, counting encoder steps of an encoder coupled to the motor, operating the motor in a reverse direction for the counted number of encoder steps, continuing to operate the motor in the opposite direction to move the stopper to a predefined distance away from the bottom wall of the syringe to draw a predefined volume of fluid into the syringe barrel.