Fluidic Valve Branching Off Sample With Low Source Flow Influence
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Solution Overview
Problem
Conventional sample management systems in liquid chromatography are limited in their ability to branch off a defined amount of fluidic sample without disturbing the flow in the source flow path, leading to issues like carry-over and pressure fluctuations.
Innovation Solution
A sample management device with a fluidic valve that establishes a temporary fluidic coupling point within the source flow path, allowing for precise adjustment of the sample volume to be branched off while maintaining continuous flow, using a volume flow adjustment unit to control pressure conditions and minimize dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional injector valve is used to branch off sample, then the sample can be diverted from the source flow path, but the flow in the source flow path is disturbed and pressure fluctuations occur
Solution Approach 1:
The fluidic coupling point is pre-established within the source flow path before sample branching is needed. This preliminary positioning allows the sample to be diverted without requiring dynamic valve switching that would interrupt the main flow, thereby maintaining flow continuity while enabling sample extraction.
Solution Approach 2:
A fluidic coupling point acts as an intermediary element within the source flow path, providing a controlled interface for sample branching. This intermediary structure allows sample diversion without directly interrupting the main flow path, reducing pressure fluctuations and maintaining flow stability.
2Quantity of substance
If a large volume of sample is branched off from the source flow path, then more sample is available for analysis, but carry-over effects increase and source flow is affected
Solution Approach 1:
The fluidic coupling point is positioned locally within the source flow path at an optimal location that minimizes disruption to the main flow while maximizing sample availability. This localized approach allows precise control over sample branching volume without affecting the entire flow path, reducing carry-over effects.
Solution Approach 2:
The position and characteristics of the fluidic coupling point are optimized to change parameters such as branching ratio and flow distribution. By adjusting these parameters, the system can branch off the required sample volume while maintaining source flow stability and minimizing carry-over through precise parameter control.
3Measurement precision
If a fluidic valve is introduced to control sample branching, then precise volume control is achieved, but device complexity increases
Solution Approach 1:
The fluidic coupling point is integrated directly into the source flow path structure, merging the sample branching function with the existing flow path. This integration eliminates the need for separate complex valve mechanisms while maintaining precise volume control capabilities, thereby reducing overall device complexity.
Solution Approach 2:
The fluidic coupling point structure is designed to automatically regulate sample branching based on inherent flow dynamics and pressure relationships. This self-regulating mechanism eliminates the need for complex external control systems, achieving precise volume control through the system's own operational characteristics rather than additional controlling components.
Data Source
AI summary
A sample management device which comprises a source flow path in which a fluidic sample can flow, a volume flow adjustment unit configured for adjusting a volume flow of the fluidic sample to be branched off from the source flow path at a fluidic coupling point, and a fluidic valve fluidically coupled with the source flow path and with the volume flow adjustment unit, wherein the fluidic valve is switchable into a branch off state in which the fluidic coupling point is established within the source flow path to branch off an adjustable volume of the fluidic sample from the source flow path via the fluidic coupling point while a flow of the fluidic sample in the source flow path continues.