Clinical Analyzer Thermal Control Using Mixed Airflow and Fluid Heating
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Solution Overview
Problem
In vitro diagnostics (IVD) systems face temperature variations due to environmental changes, affecting the accuracy of analytical processes, particularly in clinical analyzers where chemical reactions are sensitive to temperature fluctuations, leading to inconsistent test results.
Innovation Solution
A clinical analyzer module with an upper deck environmental subsystem featuring a far field sensor, heaters, spine cooling fans, and in-line fluid heat exchangers, along with a lower deck subsystem including inlet and exhaust fans, is used to regulate temperature by adjusting fan speeds and heater set-points based on ambient temperature measurements, maintaining a consistent temperature range for fluid and air within the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If environmental temperature control is not implemented, then device complexity is reduced, but temperature stability of analytical components deteriorates
Solution Approach 1:
The analyzer is divided into two distinct decks: upper deck for analytical processes requiring temperature control, and lower deck for utilities and electronics. This segmentation isolates temperature-sensitive components from environmental variations and heat-generating utilities, achieving temperature stability without requiring the entire system to be thermally controlled.
Solution Approach 2:
A thermal barrier or insulation layer is introduced between the upper analytical deck and lower utility deck. This intermediary structure prevents heat transfer from electronics and utilities to the analytical components, maintaining temperature stability without active heating or cooling systems.
2Temperature
If heaters and temperature control systems are added, then temperature stability improves, but energy consumption increases
Solution Approach 1:
The system pre-heats or pre-cools fluids and air paths before they reach the analytical reaction zones. By establishing thermal conditions in advance in reservoirs and delivery paths, the system maintains stable reaction temperatures without requiring continuous active heating during the analytical process.
Solution Approach 2:
The system utilizes the heat generated by electronics and utilities in the lower deck as a beneficial thermal source for pre-heating incoming fluids and air, rather than treating it as waste heat to be dissipated. This reduces or eliminates the need for additional heating energy in the upper analytical deck.
3Manufacturing precision
If thermal isolation between decks is implemented, then temperature control precision improves, but device complexity increases
Solution Approach 1:
The analyzer is divided into two distinct decks: upper deck for analytical processes requiring temperature control, and lower deck for utilities and electronics. This segmentation isolates temperature-sensitive components from environmental variations and heat-generating utilities, achieving temperature stability without requiring the entire system to be thermally controlled.
4Temperature
If active cooling systems are added to counteract heat from utilities, then temperature stability improves, but device complexity and energy consumption increase
Solution Approach 1:
The system utilizes the heat generated by electronics and utilities in the lower deck as a beneficial thermal source for pre-heating incoming fluids and air, rather than treating it as waste heat to be dissipated. This reduces or eliminates the need for additional heating energy in the upper analytical deck.
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 precise temperature control, maintaining the analytical process components within a desired temperature range, reducing the impact of environmental variations and ensuring consistent test results by heating fluids and air to a constant temperature, thus improving the reliability of IVD tests.
Implementation Method 1
heaters configured to generate hot airflow based on the measurements of ambient temperature from the far field sensor
Implementation Method 2
spine cooling fans configured to operate in a manner that mixes the hot airflow from the heaters with cool airflow
Implementation Method 3
in-line fluid heat exchangers configured to heat fluids used in reactions performed on the clinical analyzer module to a constant temperature
Implementation Method 4
inlet fans configured to draw air from an operating environment of the clinical analyzer module
Data Source
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Figure 3A
AI summary
An environmental control system for use in a clinical analyzer module includes an upper deck environmental subsystem comprising a far field sensor, one or more heaters, one or more spine cooling fans, and one or more in-line fluid heat exchangers. The far field sensor is configured to acquire measurements of ambient temperature in the upper deck environmental subsystem. The heaters are configured to generate hot airflow based on the measurements of ambient temperature from the far field sensor. The spine cooling fans are configured to operate in a manner that mixes the hot airflow from the heaters with cool airflow based on the measurements of ambient temperature from the far field sensor. The in-line fluid heat exchangers are configured to heat fluids used in reactions performed on the clinical analyzer module to a constant temperature.