Reverse-Vortex ICP Torch for Stable Shorter Plasma Paths
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Solution Overview
Problem
Existing ICP torches for spectrometry consume high power, require significant argon gas, and have long plasma lengths that limit analysis speed and precision, necessitating complex setups to manage plasma flow and light containment.
Innovation Solution
The ICP torch design incorporates a reverse vortex flow with a reduced length, optional gas recycling, and a non-uniform torch wall to stabilize plasma, reducing overall length and gas consumption while enhancing plasma stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard ICP torch design with long plasma path is used, then plasma stability is improved, but sample acquisition rate and analysis speed are reduced
Solution Approach 1:
The patent introduces reverse vortex flow that rotates opposite to the plasma flow direction. This counter-rotation creates a stabilizing effect on the plasma while simultaneously reducing the plasma path length, thus improving both plasma stability and sample acquisition rate without the traditional trade-off
2Reliability
If high argon gas flow rate is used, then plasma stability is improved, but gas consumption cost increases
Solution Approach 1:
The patent changes the flow parameters by introducing reverse vortex flow that rotates opposite to plasma flow. This parameter change allows stable plasma operation at reduced gas flow rates, significantly lowering argon consumption while maintaining plasma stability through the counter-rotating vortex mechanism
3Reliability
If long plasma path length is used, then plasma stability is improved, but transient signal duration increases reducing analysis speed
Solution Approach 1:
The reverse vortex flow rotating opposite to plasma flow creates a stabilizing effect that compensates for the shortened plasma path length. This allows the plasma path to be reduced (decreasing transient duration) while the counter-rotation maintains plasma stability, resolving the contradiction between path length and analysis speed
4Reliability
If high power is used, then plasma stability is improved, but energy consumption and EMI shielding cost increase
Solution Approach 1:
The patent introduces reverse vortex flow as a parameter change that fundamentally alters plasma stabilization mechanisms. This allows stable plasma operation at reduced power levels by utilizing the hydrodynamic stability provided by counter-rotating vortices, thereby reducing energy consumption and associated EMI shielding requirements
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
This design achieves faster sample acquisition rates, lower power and gas usage, and simplified setup, with improved plasma stability and reduced contamination, particularly beneficial for imaging mass cytometry applications.
Implementation Method 1
at least one vortex flow inlet positioned at the second end for inputting a gas to cause a reverse vortex flow within the torch during use
Implementation Method 2
Inductively coupled plasma (ICP) torches are commonly used as ionisation systems in combination with spectrometers
Data Source
AI summary
We describe in this application the analysis of samples using elemental or mass spectrometry and the analysis of samples, such as biological samples by suspension mass cytometry or imaging mass cytometry and an inductively coupled plasma torch with reverse vortex flow for elemental analysis and a method of operating an ICP torch configured to interface with a spectrometer.