Microfluidic Device for Automated Nucleus-Containing Cell Detection
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Solution Overview
Problem
Current methods for detecting nucleus-containing cells, such as tumor cells, in patient samples are invasive, time-consuming, and require manual processing, limiting their effectiveness in time-critical situations and point-of-care applications.
Innovation Solution
A microfluidic device and process that automates the detection of nucleus-containing cells by mixing a sample liquid with a lysis buffer, applying the lysate to a carrier substrate, and identifying cells using a fluorescent dye, allowing for rapid and efficient isolation and quantification of cells like CTCs, leukocytes, and stem cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual processing methods are used for detecting nucleus-containing cells, then measurement precision can be maintained, but productivity is reduced and loss of time increases
Solution Approach 1:
The patent replaces manual mechanical processing with an automated microfluidic system that uses magnetic fields for cell separation and optical detection for cell identification. The microfluidic device automates the entire workflow from sample injection to cell detection, eliminating manual intervention while maintaining detection accuracy through standardized protocols and automated analysis.
Solution Approach 2:
The microfluidic device is designed to perform self-service operations including automated sample processing, magnetic cell separation, and optical detection. The system autonomously completes the detection workflow without requiring continuous manual intervention, thereby increasing productivity and reducing processing time.
2Ease of operation
If invasive tissue biopsies are used, then measurement precision can be achieved, but ease of operation is reduced and object-affected harmful factors increase
Solution Approach 1:
The patent extracts the detection function from invasive tissue biopsy procedures and implements it in a minimally invasive liquid biopsy approach. By detecting nucleus-containing cells in blood or other body fluids instead of requiring tissue extraction, the system maintains diagnostic capability while significantly reducing patient invasiveness and simplifying sample collection.
3Reliability
If conventional cell separation methods are used, then purity can be improved, but device complexity and loss of time increase
Solution Approach 1:
The patent replaces complex mechanical cell separation systems with a magnetic field-based separation approach integrated into a microfluidic device. Magnetic beads coated with antibodies specifically bind to target cells, and magnetic fields efficiently separate these bound cells from the sample flow. This method achieves high separation efficiency with a compact, integrated device design.
Solution Approach 2:
The patent introduces magnetic beads as an intermediary substance to facilitate cell separation. These beads act as mediators by binding to target cells through antibody-coated surfaces and enabling their separation via magnetic fields. This intermediary approach simplifies the separation process while maintaining high purity and efficiency.
4Measurement precision
If large volumes of reagents and samples are used, then measurement precision can be maintained, but loss of substance and productivity are reduced
Solution Approach 1:
The patent transitions from conventional bulk reagent and sample handling to micro-scale operations within a microfluidic device. By confining reactions and separations to micro-channels and micro-compartments, the system achieves high measurement precision using significantly reduced volumes of reagents and samples, thereby minimizing substance loss and improving productivity.
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 fully automated, isolation-free quantification of circulating tumor cells from whole blood, reducing processing time and cell damage, and facilitating rapid analysis in time-critical situations with minimal reagents and sample volumes.
Implementation Method 1
the lysis buffer can be formed as an ammonium chloride lysis buffer (ACK lysis buffer), for example to produce a difference in density of the cells
Implementation Method 2
the lysate is applied onto the carrier substrate where it can rest for a predetermined period of time. During this period of time, sedimentation can advantageously occur so that the cell sediment, which means still intact cells, can deposit on the carrier substrate
Implementation Method 3
the nucleus-containing cells from the cell sediment can be optically detected and additionally or alternatively quantified
Data Source
AI summary
A process for detecting nucleus-containing cells in a sample liquid of a patient using a microfluidic device is disclosed. The process includes (i) providing a mixing signal to a mixing device, wherein the mixing signal causes mixing of the sample liquid with a lysis buffer in a mixing chamber of the microfluidic device in order to obtain a lysate, (ii) outputting an application signal which causes application of the lysate onto a carrier substrate of the microfluidic device in order to obtain a cell sediment and cell suspension of the lysate, and (iii) identifying the nucleus-containing cells from the cell sediment.