Dual-Mode Ion Guide for Mass Spectrometry

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Solution Overview

Problem

Conventional mass spectrometers are limited in their ability to simultaneously separate ions based on both ion mobility and mass-to-charge ratio, often requiring different operational modes and pressures, which can compromise resolution and efficiency.

Innovation Solution

A mass spectrometer design featuring a device with a multipole rod set, ion tunnel, or stack of electrodes, capable of applying both axial and radial electric fields in a manner that allows for temporal separation of ions according to ion mobility in one mode and mass-to-charge ratio in another, using a combination of continuous and pulsed electric fields to control ion velocity and confinement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional mass spectrometers use separate operational modes for ion mobility and mass analysis, then separation resolution is improved, but device complexity and operational time increase

Engineering Contradiction:
Improveseparation resolutionVSAvoiddevice complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The ion guide device is designed to perform multiple functions: it can separate ions by ion mobility in a first operational mode and by mass-to-charge ratio in a second operational mode. This multi-functionality eliminates the need for separate dedicated devices for each separation type, reducing overall device complexity while maintaining high resolution for both separation modes.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The ion guide operates dynamically by switching between different operational modes. By adjusting operational parameters such as electric field configuration and pressure conditions, the same physical device can adapt to perform either ion mobility separation or mass analysis, providing dynamic versatility without requiring multiple static configurations.

Inventive Principle:
Principle #15Dynamics

2Measurement precision

If conventional mass spectrometers require different pressures for ion mobility and mass analysis modes, then separation quality is improved, but loss of time and reduced productivity occur

Engineering Contradiction:
Improveseparation qualityVSAvoidduty cycle
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The invention maintains a substantially constant pressure condition throughout the ion guide device during operation. By changing operational parameters such as electric field strength and configuration rather than pressure, the device achieves different separation modes (ion mobility vs. mass analysis) without requiring pressure changes, thereby maintaining high productivity and duty cycle while preserving separation quality.

Inventive Principle:
Principle #35Parameter changes

3Adaptability or versatility

If conventional instruments require complex vacuum systems for dual-mode operation, then separation capabilities are improved, but device complexity and ease of operation deteriorate

Engineering Contradiction:
Improveseparation capabilitiesVSAvoidease of operation
Core Design Contradiction:
Adaptability or versatilityVSEase of operation

Solution Approach 1:

The ion guide operates in an inert gas environment at substantially constant pressure, eliminating the need for complex vacuum systems. This approach maintains separation capabilities for both ion mobility and mass analysis while significantly simplifying the overall system and improving ease of operation, as the inert gas environment is inherently more stable and easier to maintain than vacuum conditions.

Inventive Principle:
Principle #39Inert atmosphere (Inert environment)

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

Enables high-efficiency separation of ions in both ion mobility and mass-to-charge ratio modes at relatively high pressures, maintaining high transmission efficiency and allowing for a dual-mode operation without the need for complex vacuum systems, thereby enhancing the instrument's duty cycle and resolution.

Implementation Method 1

separate ions temporally according to their ion mobility

Methodology Applied
Scientific EffectIon mobility: Electrophoresis

Implementation Method 2

separate ions according to their mass to charge ratio

Methodology Applied
Scientific EffectMass-to-charge ratio separation: Electrophoresis

Data Source

PatentEP2747124B1Mass spectrometer
Publication Date: 2020.09.09 MICROMASS UK LTD
  • EP2747124B1 patent drawingFigure 1~2
  • EP2747124B1 patent drawingFigure 3
  • EP2747124B1 patent drawingFigure 4~5

AI summary

A mass spectrometer comprising a device for separating ions temporally comprising an ion guide comprising a plurality of electrodes, wherein in a first mode of operation said device is arranged and adapted to separate ions temporally according to their ion mobility and wherein in a second mode of operation said device is arranged and adapted to separate ions according to their mass to charge ratio.