Density-Based Cell Detection Using Gold Particle Stacking
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Solution Overview
Problem
Current methods for detecting and monitoring HIV-related cellular markers in resource-poor settings are often costly and require trained personnel, dedicated electronic or optical components, and external power, limiting their accessibility and applicability.
Innovation Solution
A low-cost method using density labels, such as gold particles, to separate specific cell types from other cells in a sample by combining the sample with a probe specific for cell surface markers and a density medium, allowing for centrifugation-based separation and visualization of the target cell population.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cell detection methods are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the detection function from complex electronic/optical instruments and implements it through a simple density-based separation system using centrifugation and visual observation of cell stacks, eliminating the need for sophisticated detection equipment while maintaining measurement capability
Solution Approach 2:
The invention changes the detection parameter from optical/electronic signals requiring complex instruments to physical density differences that can be separated and visualized through simple centrifugation, transforming the measurement approach from instrument-dependent to physics-based
2Measurement precision
If conventional cell detection methods are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The density-based separation system performs the detection function through physical principles (density differentiation and centrifugal separation) that automatically distinguish target cells without requiring operator interpretation or complex instrument operation, making the system self-explanatory and easy to use
Solution Approach 2:
The invention removes the requirement for trained operators and complex instrument operation by extracting the detection capability into a simple visual observation of cell stack formation, which can be performed by anyone with basic literacy
3Measurement precision
If conventional cell detection methods are used, then measurement precision is improved, but loss of energy increases
Solution Approach 1:
The invention replaces electronic/optical detection systems requiring external power with a mechanical centrifugation-based separation system that uses minimal energy input (manual or simple motor-driven centrifuge) to achieve cell separation and detection through density differences
4Device complexity
If low-cost density-based method is used, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The invention uses density labels with contrasting optical properties (such as gold particles) that create visible changes in the cell stack formation, enabling accurate detection and quantification of target cells through simple visual observation or basic imaging without compromising measurement precision
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 facile and flexible point-of-care measurements of cellular markers, reducing costs and eliminating the need for trained operators or external power, thereby enhancing the accessibility of HIV monitoring in resource-poor settings.
Implementation Method 1
separating labeled cells of the reaction mixture through a density medium, the labeled cells of the subpopulation being denser than the density medium and the other cells of the sample being less dense than the density medium
Implementation Method 2
separating labeled cells of the reaction mixture through a density medium
Implementation Method 3
separating labeled cells of the reaction mixture through a density medium
Data Source
AI summary
The invention provides a low-cost method for identifying and/or measuring a subpopulation of cells in a biological sample, such as a subpopulation of CD4-positive cells in a whole blood sample. In accordance with the invention, one or more cell surface markers are identified on a subpopulation of interest, which collectively are present in higher numbers on the cells of the subpopulation than on cells not in the subpopulation of interest. A probe comprising a binding compound and a density label are combined with the sample and the resulting mixture is centrifuged or sedimented through a density medium in a capillary. Labeled cells of interest pass through the density medium and stack at the bottom of the capillary where they may be visually detected and quantified by the height of the stack.