Pin-Based Valve Actuation for Microfluidic Nucleic Acid Processing
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Solution Overview
Problem
Current molecular diagnostic systems are labor-intensive, low throughput, and expensive, with methods being specific to certain sample matrices and nucleic acid types, often resulting in insufficient sample quantity, quality, and purity for robust diagnostic techniques.
Innovation Solution
A system comprising a molecular diagnostic module with a microfluidic cartridge, heating and cooling subsystem, magnet, valve actuation subsystem, and optical subsystem, which automates the processing and analysis of biological samples by aspirating, dispensing, and combining nucleic acids with reagents, facilitating separation, amplification, and analysis through controlled heating, magnetic extraction, and optical detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated processing systems are implemented, then productivity and throughput are improved, but device complexity increases
Solution Approach 1:
The system is divided into modular components including a microfluidic cartridge with integrated valves, pumps, and reaction chambers. Each module performs a specific function (sample preparation, nucleic acid extraction, amplification, detection) that can be independently optimized and replaced, reducing overall system complexity while maintaining high throughput automated processing.
Solution Approach 2:
The microfluidic cartridge contains nested sub-components where valves, channels, and reaction chambers are integrated within a single cartridge unit. The valve actuation subsystem further nests pins and actuators within a compact housing, allowing complex functions to be packaged in space-efficient configurations that enable automated high-throughput processing without proportionally increasing system complexity.
2Productivity
If multiple processing functions are integrated into one system, then productivity increases, but device complexity increases
Solution Approach 1:
The microfluidic cartridge is designed as a universal platform that can perform multiple diagnostic functions including sample lysis, nucleic acid binding, washing, elution, PCR amplification, and fluorescent detection. The valve actuation subsystem provides multi-functional control over fluid routing to different chambers, allowing a single integrated system to handle complete diagnostic workflows from sample input to result output, thereby increasing processing capacity while managing integration complexity through standardized interfaces.
3Manufacturing precision
If precise valve control is implemented for fluid management, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The valve actuation mechanism replaces complex multi-component mechanical valve systems with a simplified pin-based actuation system. Pins are driven linearly by actuators to directly occlude or open fluid pathways at specific locations. This mechanical substitution eliminates the need for complex linkages, springs, and seals while achieving precise control over fluid flow, thereby improving manufacturing precision for fluid management while reducing overall device complexity.
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 enables efficient, automated processing and analysis of nucleic acids, improving sample quality and throughput while reducing labor and costs, allowing for robust molecular diagnostic protocols across various sample types.
Implementation Method 1
heating and cooling subsystem, facilitating separation, amplification, and analysis through controlled heating
Implementation Method 2
magnetic extraction, and optical detection
Data Source
AI summary
A system and method for processing and detecting nucleic acids from a set of biological samples, comprising: a molecular diagnostic module configured to receive nucleic acids bound to magnetic beads, isolate nucleic acids, and analyze nucleic acids, comprising a cartridge receiving module, a heating/cooling subsystem and a magnet configured to facilitate isolation of nucleic acids, a valve actuation subsystem including an actuation substrate, and a set of pins interacting with the actuation substrate, and a spring plate configured to bias at least one pin in a configurations, the valve actuation subsystem configured to control fluid flow through a microfluidic cartridge for processing nucleic acids, and an optical subsystem for analysis of nucleic acids; and a fluid handling system configured to deliver samples and reagents to components of the system to facilitate molecular diagnostic protocols.