Thermally Responsive Aliphatic Partitions for Automated Sample Transport
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Solution Overview
Problem
Current point-of-care (PoC) diagnostics face challenges in processing complex raw samples like whole blood without manual interventions, as existing methods require precise reagent transfers and are prone to contamination, evaporation, and mechanical disturbance, lacking user-friendly, low-cost solutions for automated sample preparation and analysis.
Innovation Solution
The use of thermally responsive aliphatic partitions (TRAPS) to separate and transport magnetic beads in a magnetofluidics assay, enabling hands-free sample preparation and analysis by liquefying at specific temperatures to facilitate magnetic movement through partitions, allowing for sample-to-answer immunoassays in devices like the PHAST and STAT platforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If magnetic beads are transported through partitions in magnetofluidics assay, then automated sample preparation is achieved, but partitions are susceptible to contamination, evaporation, and mechanical disturbance
Solution Approach 1:
The patent utilizes the phase transition of aliphatic compounds between solid and liquid states in response to temperature changes. At lower temperatures, the aliphatic partitions are solid and provide stable containment preventing contamination, evaporation, and mechanical disturbance. When heated, they transition to liquid state allowing magnetic beads to pass through, thus enabling automated transport while maintaining reliability through controlled phase changes.
Solution Approach 2:
The patent changes the temperature parameter of the aliphatic partitions to control their state and functionality. By cycling the temperature, the system transitions the partitions between solid (providing containment and stability) and liquid (allowing bead transport) states, thus resolving the contradiction between automation and reliability.
2Productivity
If thermally responsive aliphatic partitions are heated to facilitate magnetic bead movement, then sample-to-answer immunoassay is enabled, but energy consumption increases
Solution Approach 1:
The patent employs periodic heating cycles to melt the aliphatic partitions only when needed for bead transport. The heating is applied intermittently rather than continuously, allowing the partitions to solidify and provide containment during non-transport phases. This periodic action enables the sample-to-answer workflow while minimizing overall energy consumption.
3Ease of operation
If complex raw samples like whole blood are processed without manual intervention, then user-friendly diagnostics are achieved, but precise reagent transfer and mixing become difficult
Solution Approach 1:
The patent employs capillary action to enable self-driven sample and reagent movement through the device channels. The wicking material automatically draws liquids through the device without requiring external pumps or precise manual transfers, thus achieving both ease of operation and adequate mixing precision through passive self-service mechanisms.
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 rapid, accurate, and cost-effective detection of analytes in complex samples such as whole blood, reducing the need for bulky equipment and skilled operators, with devices like the PHAST and STAT providing results within an hour, suitable for diagnosing conditions like multiple organ failure and viral infections.
Implementation Method 1
thermally responsive aliphatic partitions (TRAPS) to separate and transport magnetic beads in a magnetofluidics assay, enabling hands-free sample preparation and analysis by liquefying at specific temperatures
Implementation Method 2
transport magnetic beads in a magnetofluidics assay... facilitating magnetic movement through partitions
Implementation Method 3
separating the complexes from unbound second capture molecules by selectively moving the complexes through one or more liquefied aliphatic partitions via application of a magnetic field
Data Source
AI summary
A method and test system for detecting the presence of an analyte in a sample comprising a binding region and a detecting region, where the binding region contains a plurality of magnetic beads attached to a plurality of first capture molecules that bind to an analyte of interest in the sample, and a plurality of second capture molecules having a detectable label attached thereto, where the second capture molecules bind to the analyte of interest to form a complex, where the complexes are moved through at least one liquefied aliphatic partition via a magnetic field into the detecting region that having a detection composition allows for detection and, optionally, for signal quantification.