Dissolvable Membrane Fluid Metering in Point-of-Care Diagnostic Cartridges
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Solution Overview
Problem
Conventional infectious disease diagnosis in outpatient settings is hindered by the lack of suitable equipment and resources, leading to delayed and inaccurate diagnoses, which can result in inappropriate antibiotic prescriptions and the emergence of antibiotic-resistant strains.
Innovation Solution
A point-of-care diagnostic device featuring a specimen processing cartridge with a dissolvable membrane and elastic diaphragm that facilitates the timed and metered delivery of reagents across a capillary plate apparatus, enabling accurate and rapid pathogen detection using a smartphone or computing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If centralized laboratory testing is used for infectious disease diagnosis, then diagnostic accuracy is improved, but accessibility and speed of diagnosis deteriorate due to limited availability and longer processing times
Solution Approach 1:
The diagnostic system is segmented into a portable point-of-care device that can be used in outpatient settings, separating the diagnostic function from centralized laboratories. The device includes integrated components for specimen processing, reagent delivery, and detection, enabling standalone operation without laboratory infrastructure.
Solution Approach 2:
The point-of-care device is designed to be self-contained and self-operating, with automated reagent delivery systems and integrated detection mechanisms that require minimal user intervention. The device performs complete diagnostic processes independently, eliminating the need for centralized laboratory resources.
2Measurement precision
If conventional laboratory equipment is used in outpatient settings, then diagnostic capability is improved, but device complexity and cost increase due to equipment requirements
Solution Approach 1:
Multiple diagnostic functions are merged into a single integrated cartridge, combining specimen processing, reagent storage, fluid delivery, and detection components. This consolidation eliminates the need for separate laboratory equipment while maintaining full diagnostic capability.
Solution Approach 2:
The point-of-care device is designed with universal functionality to perform complete diagnostic processes including specimen reception, reagent mixing, incubation, and detection. The single device replaces multiple specialized laboratory instruments, reducing complexity while expanding capability.
3Speed
If rapid diagnostic testing is implemented in outpatient settings, then speed of diagnosis is improved, but measurement precision deteriorates due to limited testing capabilities
Solution Approach 1:
Reagents are pre-loaded into the cartridge in ready-to-use configurations, with precise positioning and protection until needed. The system performs preliminary preparation of all diagnostic components during manufacturing, enabling rapid execution at the point of care without compromising accuracy.
Solution Approach 2:
The device uses pneumatic and hydraulic mechanisms to automate fluid delivery and mixing processes, ensuring precise reagent dispensing and incubation conditions. These automated fluid handling systems maintain measurement precision while enabling rapid testing execution.
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 provides rapid, accurate, and cost-effective diagnostic capabilities at the point of care, improving health outcomes by enabling timely and appropriate treatment while reducing antibiotic resistance.
Implementation Method 1
a dissolvable membrane that occludes the fluid outlet when the dissolvable membrane is in a first, undissolved state, and that permits flow from the reservoir to the downstream reservoir when in a second, dissolved state
Implementation Method 2
The elastic diaphragm is operable to pressurize the reservoir upon receiving the volume of liquid when the dissolvable membrane is in the first, undissolved state
Implementation Method 3
The elastic diaphragm is operable to contract and propel at least a portion of the volume of liquid from the reservoir to the downstream reservoir when the dissolvable membrane is in the second, dissolved state
Data Source
AI summary
A specimen processing cartridge includes a reservoir having a fluid inlet, an elastic diaphragm, and a fluid outlet. The reservoir is operable to receive a volume of liquid from the fluid inlet, and the fluid outlet is positioned along a fluid flow path between the reservoir and a downstream reservoir. The cartridge includes a dissolvable membrane that occludes flow through the fluid outlet when the dissolvable membrane is in a first, undissolved state, and that permits flow from the reservoir to the downstream reservoir when in a second, dissolved state. The elastic diaphragm is operable to pressurize the reservoir upon receiving the volume of liquid when the dissolvable membrane is in the first, undissolved state, and is operable to contract and propel at least a portion of the volume of liquid from the reservoir to the downstream reservoir when the dissolvable membrane is in the second, dissolved state.