MEMS Cell Sorting System Using Electromagnetic Actuation
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Solution Overview
Problem
Microfluidic cell sorting systems face challenges with clogging of narrow passageways and interfacing with macroscopic features, as well as controlling the movement of small, movable devices, which affects their reliability and efficiency in sorting rare cells.
Innovation Solution
A microfabricated cell sorting system using a plastic interposer for interconnections between microscopic and macroscopic features, a specially designed electromagnet for precise magnetic actuation, and a novel fluid formulation to reduce clogging, including a disposable cartridge with sample, sort, and waste reservoirs, and a tapered electromagnet with heat sinking to minimize heat production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If narrow passageways are used in microfluidic devices for cell sorting, then device size is reduced and integration is improved, but clogging occurs and reliability deteriorates
Solution Approach 1:
The microfluidic device is divided into multiple channels with different width characteristics. Some channels have narrower sections for integration while other sections have wider passageways to prevent clogging, allowing the system to benefit from both small size and reliable operation without compromise
2Measurement precision
If narrow passageways are used to handle small volumes of fluid, then sorting precision is improved, but clogging increases and operation difficulty worsens
Solution Approach 1:
Different regions of the microfluidic device have different channel width characteristics optimized for their specific functions. The sorting region has narrow passageways for high precision, while upstream and downstream regions have wider channels for easier operation and reduced clogging risk
3Measurement precision
If electromagnetic actuation is used to control small MEMS devices, then control precision is improved, but heat production increases and energy efficiency worsens
Solution Approach 1:
A magnetic field is introduced as an intermediary actuation mechanism that can precisely control the MEMS device through non-contact magnetic forces. The magnetic field serves as a mediator between the control system and the MEMS actuator, enabling precise control while avoiding direct mechanical contact and reducing heat generation compared to conventional electromagnetic heating methods
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 enhances the reliability and efficiency of cell sorting by reducing clogging, improving cell viability, and allowing for precise control of the MEMS chip, making it gentler on cells and more cost-effective compared to traditional flow cytometers.
Implementation Method 1
a specially designed electromagnet provides the precisely located electromagnetic fields which cause the very small MEMS chip to move within the much larger system
Implementation Method 2
A specially designed electromagnet provides the precisely located electromagnetic fields which cause the very small MEMS chip to move
Implementation Method 3
The tapered tip and magnetic core may have a particular shape and dimensions, and may be embedded in a heat sinking material to improve performance
Data Source
AI summary
A MEMS-based cell sorting system is disclosed, which uses a novel combination of features to accomplish the cell sorting in the microfabricated channels housed in a disposable cartridge. The MEMS-based cell sorting system may include a microfabricated cell sorting valve that is responsive to an applied magnetic field. The MEMS-based cell sorting system may further include an electromagnet that generates a magnetic field to actuate the microfabricated cell sorting valve. The electromagnet may have a design which allows it to create a very localized magnetic field while having adequate thermal properties to operate reliably.