Inert Metal Injector Inserts for Chromatography Accuracy
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Solution Overview
Problem
Chromatography systems face accuracy issues due to material reactions with samples in injector assemblies, leading to reduced measurement accuracy, especially with labile compounds and volatile solvents.
Innovation Solution
The use of fluid injector inserts with inlets and outlets made from substantially inert materials such as titanium, titanium oxide, or nickel alloys, which minimize catalytic reactions and are designed to couple with injector assemblies to prevent sample interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional materials are used in injector assemblies, then manufacturing cost and ease of manufacture are improved, but measurement precision deteriorates due to material reactions with samples
Solution Approach 1:
The patent applies local quality by using substantially inert materials specifically for the inlet portion of the injector assembly that contacts the sample, while other parts of the assembly may use conventional materials. This targeted approach improves measurement precision where it matters most (at the sample contact point) without requiring the entire assembly to be manufactured from expensive inert materials, thus balancing measurement accuracy with manufacturing considerations.
2Measurement precision
If substantially inert materials are used in the inlet, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the injector assembly into distinct portions with different material properties. The inlet is made from substantially inert materials while other components may use conventional materials. This segmentation allows the system to achieve high measurement precision in the critical sample contact zone without requiring the entire device to be constructed from specialized materials, thereby limiting the increase in device complexity to only the necessary components.
3Reliability
If conventional materials are used in injector assemblies, then device complexity is reduced, but reliability deteriorates due to catalytic reactions with labile compounds
Solution Approach 1:
The patent implements local quality by confining the use of substantially inert materials to the inlet portion where sample contact occurs. This ensures reliable performance (improved recovery and linearity) in the critical measurement zone without requiring the entire injector assembly to be made from complex inert material constructions, thus achieving high reliability with minimal increase in overall device complexity.
4Reliability
If substantially inert materials are used throughout the assembly, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the injector assembly to use substantially inert materials only in the inlet portion where sample contact occurs, rather than throughout the entire assembly. This segmentation maintains reliability (recovery and linearity) in the critical measurement zone while avoiding the increased manufacturing costs that would result from constructing the entire assembly from expensive inert materials, thus achieving a cost-effective balance between reliability and manufacturing expense.
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 inserts significantly reduce unwanted reactions, improving the recovery and linearity of labile compounds, enhancing the accuracy of chromatographic measurements.
Implementation Method 1
The materials commonly used in the injector assemblies can react with the sample and reduce the accuracy of the measurements
Data Source
AI summary
Certain embodiments described herein are directed to injector inserts and injector assemblies. In some examples, an injector insert that includes an inlet comprising a substantially inert metal is described. In other examples, an injector that includes a major amount of a substantially inert metal in a fluid flow path is disclosed. Devices and systems using the injectors inserts and injectors are also described.