Self-Powered Microfluidic Circuits with Capillary Flow Control
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Solution Overview
Problem
Current microfluidic systems for point-of-care applications are complex, require sophisticated peripherals, and are difficult to implement as low-cost, robust, and portable systems, especially for detecting bacteria and circulating tumor cells, due to challenges in fluid flow control and sample processing times.
Innovation Solution
The development of pre-programmed self-powered microfluidic systems employing capillary elements with advanced designs for capillary pumps, retention valves, and trigger valves that allow for sequential and reversible fluid flow, reducing the need for external peripherals and enabling efficient sample processing and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microfluidic systems are used for point-of-care applications, then fluid flow control and sample processing can be achieved, but the systems become complex and require sophisticated peripherals
Solution Approach 1:
The patent implements self-powered microfluidic systems where capillary elements autonomously drive fluid flow without external pumps or complex control mechanisms. The capillary pumps and retention valves use inherent capillary pressure differences to control fluid movement, eliminating the need for sophisticated peripherals while maintaining reliable flow control for point-of-care applications
Solution Approach 2:
The patent replaces mechanical pump systems with capillary action-based fluid control. By using capillary pressure gradients instead of mechanical pumps and valves, the system achieves fluid flow control without complex mechanical components, reducing overall system complexity while maintaining functionality
2Productivity
If conventional microfluidic systems are implemented, then sample processing can be performed, but the systems are difficult to implement as low-cost and portable solutions
Solution Approach 1:
The patent employs disposable microfluidic cartridges containing pre-programmed capillary elements that can be mass-produced at low cost. These single-use cartridges eliminate the need for expensive, complex reusable systems with sophisticated peripherals, making point-of-care testing accessible and portable while maintaining sample processing capability
Solution Approach 2:
The patent divides the microfluidic system into modular components: a simple handheld reader and disposable cartridges containing capillary pumps, retention valves, and assay elements. This segmentation allows the complex sample processing functionality to be contained in pre-fabricated cartridges that are easy to manufacture and distribute, while the portable reader remains simple and low-cost
3Ease of operation
If advanced capillary elements are used for sequential and reversible fluid flow, then flow control is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses capillary elements with varying cross-sectional dimensions to create different capillary pressure values for sequential activation. By designing retention valves with progressively smaller cross-sections, the system achieves programmable fluid flow sequences through passive capillary pressure gradients, providing ease of operation while using manufacturable dimension variations
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
These systems provide efficient, low-cost, and portable solutions for point-of-care diagnostics, enabling rapid sample processing and analysis, such as bacterial detection and circulating tumor cell isolation, with improved flow control and reduced processing times.
Implementation Method 1
capillary elements with advanced designs for capillary pumps, retention valves, and trigger valves that allow for sequential and reversible fluid flow
Implementation Method 2
pre-programmed self-powered microfluidic systems employing capillary elements with advanced designs for capillary pumps
Data Source
AI summary
A major challenge for the general use of “lab-on-a-chip” (LOAC) systems and point-of-care (POC) devices has been the generally complex and need for sophisticated peripheral equipment, such that it is more difficult than anticipated to implement low cost, robust and portable LOAC/POC solutions. It would be beneficial for chemical, medical, healthcare, and environmental applications to provide designs for inexpensive LOAC/POC solutions compatible with miniaturization and mass production, and are potentially portable, using compact possibly hand-held instruments, using reusable or disposable detectors. Embodiments of the invention address improved circuit elements for self-powered self-regulating microfluidic circuits including programmable retention valves, programmable trigger valves, enhanced capillary pumps, and flow resonators. Additionally embodiments of the invention allow for the flow direction within a microfluidic circuit to be reversed as well as for retention of reagents prior to sale or deployment of the microfluidic circuit for eased user use.