Rotational Substrate with Magnet and Capillary Channel for Magnetic Particle Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current substrate technologies for sample analysis struggle with performing complex reaction steps, such as those involved in assay techniques like immunoassay and genetic diagnosis, due to limitations in effectively separating magnetic particles and analyte components.
Innovation Solution
A substrate design featuring a rotation axis, a first chamber for retaining magnetic particles and liquid, a second chamber for liquid discharge, and a capillary channel connecting the two, with a magnet positioned to capture magnetic particles, allowing for efficient liquid transfer and separation through rotational motion and capillary action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic particles are captured using a magnet in the first chamber, then separation reliability is improved, but device complexity increases due to additional chambers and channels
Solution Approach 1:
The substrate is divided into multiple functional chambers: a first chamber for capturing magnetic particles and a second chamber for collecting separated liquid. This segmentation allows independent optimization of separation and collection functions while maintaining overall system reliability.
Solution Approach 2:
A capillary channel acts as an intermediary structure connecting the first and second chambers. The capillary action in this channel enables automatic liquid transfer from the first chamber to the second chamber without external pumping, reducing device complexity while maintaining separation reliability.
2Ease of operation
If capillary action is used to transfer liquid through the channel, then ease of operation is improved through automatic liquid transfer, but manufacturing precision requirements increase for channel formation
Solution Approach 1:
The capillary channel utilizes capillary action to automatically transfer liquid from the first chamber to the second chamber without requiring external pumps or complex control systems. This self-service mechanism simplifies operation while the channel geometry is designed to optimize capillary flow characteristics.
Solution Approach 2:
The channel dimensions and surface properties are specifically designed to optimize capillary action parameters. By controlling channel width, depth, and surface energy characteristics, the system achieves reliable automatic liquid transfer while managing manufacturing precision requirements through standardized fabrication processes.
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 design enables more reliable separation and analysis of components within analytes by ensuring magnetic particles are retained while the liquid is transferred to the second chamber, facilitating complex reaction steps and enhancing detection sensitivity.
Implementation Method 1
a magnet being located in the substrate and near the first space in the substrate for capturing the magnetic particles in the first chamber
Implementation Method 2
the channel being capable of being filled via capillary action with the liquid retained in the first space
Data Source
AI summary
A substrate for sample analysis on which transfer of a liquid is to occur with rotational motion includes: a substrate having a rotation axis; a first chamber being located in the substrate and having a first space for retaining a liquid and magnetic particles; a second chamber being located in the substrate and having a second space for retaining the liquid to be discharged from the first chamber; a channel being located in the substrate and having a path connecting the first chamber and the second chamber; and a magnet being located in the substrate and near the first space in the substrate for capturing the magnetic particles in the first chamber.