Magnetic Bead CTC Detection via Hall Effect Sensors
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Solution Overview
Problem
Current methods for detecting circulating tumor cells (CTCs) are hindered by low sensitivity, extensive sample processing, and high instrument costs, which lead to cell viability issues and limited downstream analysis capabilities.
Innovation Solution
A system utilizing magnetic beads and Hall effect sensors to detect bead-labeled target cells directly, enabling simultaneous detection of multiple cells without the need for optical methods, thereby maintaining cell viability and reducing processing time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical detection methods are used for CTC detection, then detection sensitivity can be improved, but instrument cost and device complexity increase significantly
Solution Approach 1:
The patent replaces optical detection systems with magnetic detection systems. Magnetic beads conjugated with antibodies bind to CTCs, and magnetic sensors detect the magnetic signal from the bound beads. This substitution eliminates the need for complex optical components (light sources, detectors, optics) while maintaining detection sensitivity through magnetic signal detection.
Solution Approach 2:
The patent introduces magnetic beads as an intermediary between the target cells (CTCs) and the detection system. The magnetic beads serve as carriers that bind to CTCs via antibody-conjugation and provide a detectable magnetic signal, enabling indirect detection of rare CTCs in blood samples without requiring direct optical visualization of the cells.
2Measurement precision
If extensive sample processing is performed to purify CTCs, then detection purity is improved, but processing time and cell viability deteriorate
Solution Approach 1:
The patent performs preliminary magnetic bead conjugation with antibodies before sample processing. The magnetic beads are pre-functionalized with antibodies that specifically bind to CTC surface markers. When the blood sample is introduced, the pre-prepared magnetic beads immediately bind to CTCs, enabling rapid enrichment without requiring multiple sequential purification steps, thus reducing processing time while maintaining purity.
3Productivity
If multiple CTCs are detected simultaneously, then productivity is improved, but measurement precision and cell viability may worsen
Solution Approach 1:
The patent segments the detection process into independent magnetic sensor elements arranged in arrays. Each sensor element can detect magnetic signals from individual or multiple magnetic bead-CTC complexes. This segmentation allows parallel detection of multiple CTCs simultaneously across the sensor array while maintaining the ability to resolve and count individual events, thus achieving high throughput without sacrificing 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
The system achieves high sensitivity and specificity in CTC detection with high recovery rates (>87%) and purity (>99%) in under 30 minutes, facilitating downstream molecular analysis while minimizing sample processing and instrument complexity.
Implementation Method 1
binding magnetic beads to target cells
Implementation Method 2
Hall effect sensors to detect bead-labeled target cells
Data Source
AI summary
A system and method for detection of cells is disclosed. Target cells, such as circulating tumor cells (CTCs), may be of interest. Magnetic beads may be bound to the target cells. After which, the target cells (with the magnetic beads attached thereto) may be identified using an applied magnetic field. In one example, magnetic sensors may be used to detect movement of the target cells responsive to an applied magnetic field. In another example, an optical sensor (such as a camera) may be used to detect movement of the target cells responsive to an applied magnetic field. Further, separate from identification of the target cells, the target cells may be sorted using an applied magnetic field. In this way, a magnetic field may be used in either or both of target cell identification or target cell sorting in order to detect target cells of interest.