MALDI Ion Source Diaphragm Cleaning via Infrared Laser Sublimation

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Solution Overview

Problem

Current methods for cleaning ion sources in MALDI mass spectrometers are inefficient and disrupt the analysis process, as they require manual intervention, extensive recalibration, and displacement of the sample support plate, which affects precision and throughput.

Innovation Solution

A method that involves temporarily moving the sample support plate aside and heating the acceleration diaphragms around the ion beam apertures to sublimate the deposited matrix material using infrared radiation from laser diodes, allowing for automatic and precise cleaning without disturbing the sample positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual cleaning of acceleration diaphragms is performed, then the ion source can be cleaned effectively, but the analysis process is interrupted and extensive recalibration is required

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidanalysis interruption time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces manual mechanical cleaning with an automated thermal field-based cleaning system. A heating element is integrated into the ion source to heat the acceleration diaphragm, causing matrix material to sublime and be removed automatically without manual intervention, thus resolving the contradiction between effective cleaning and analysis interruption time

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The ion source is equipped with self-cleaning capability through integrated heating elements that automatically sublime deposited matrix material from acceleration diaphragms. The system performs maintenance functions autonomously without requiring removal from the vacuum system or manual intervention, maintaining both cleaning effectiveness and continuous operation

Inventive Principle:

Principle #25Self-service

2Ease of operation

If the sample support plate is removed for cleaning, then the ion source can be accessed, but precise repositioning is compromised and recalibration is required

Engineering Contradiction:

Improvecleaning accessibilityVSAvoidsample positioning precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent extracts the heating function from a separate manual cleaning process and integrates it directly into the ion source structure. The heating element is positioned to access only the acceleration diaphragm area, allowing cleaning without removing the sample support plate, thus maintaining both accessibility and positioning precision

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The heating is applied locally and selectively to the acceleration diaphragm regions that require cleaning, rather than heating the entire ion source or sample support plate. This localized approach enables effective cleaning of contaminated areas while leaving the sample support plate undisturbed and precisely positioned

Inventive Principle:

Principle #3Local quality

3Reliability

If heating is applied to clean the ion source, then matrix material can be removed, but the sample on the support plate may be damaged

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidsample damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies heating at controlled levels sufficient to sublime matrix material from the acceleration diaphragm but below the threshold that would damage the sample on the support plate. The heating parameters are optimized to achieve cleaning effectiveness while maintaining sample integrity

Inventive Principle:

Principle #16Partial or excessive action

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 approach enables rapid and automatic cleaning of the ion source electrodes, minimizing downtime and maintaining the precision of sample positioning, thus enhancing the operational efficiency and throughput of mass spectrometers.

Implementation Method 1

The heating can be achieved by direct or indirect electric heating, by induction heating, or, particularly favorably, by the energy of electromagnetic radiation, for example by irradiation with the infrared light of suitable laser diodes.

Methodology Applied

Scientific EffectInfrared radiation: Infrared Radiation

Implementation Method 2

temporarily heating up specifically the area around the ion beam apertures in the acceleration diaphragms in the ion source to a sufficient degree that the matrix material deposited or splashed on the diaphragms vaporizes by sublimation in the vacuum

Methodology Applied

Scientific EffectSublimation: Sublimation

Data Source

PatentUS7989762B2Automatic cleaning of MALDI ion sources

Publication Date: 2011.08.02 BRUKER DALTONIK GMBH & CO KG

AI summary

In an ion source that generates ions by matrix-assisted laser desorption (MALDI), ion acceleration diaphragms having apertures though which ions are accelerated and which have become contaminated by matrix material, are cleaned by temporarily heating the diaphragms. During the cleaning process, the sample support plate is moved aside but remains in the ion source housing, and the heating is preferably limited to regions surrounding the apertures in the diaphragms. In one embodiment, the diaphragms are heated by irradiation generated by infrared laser diodes.