MAI Ionization via Backside Gas Pulse or Piezo Strike
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Solution Overview
Problem
Current mass spectrometry techniques face limitations in achieving precise temporal and spatial control of ion formation, particularly in matrix-assisted ionization (MAI), which is essential for high-resolution imaging and analysis, as they often require lasers or mechanical tapping with limited precision and efficiency.
Innovation Solution
A mass spectrometer system utilizing a pulsed valve or piezoelectric cantilever to direct a force at the back side of a sample substrate, generating ions without the need for lasers, allowing for improved temporal and spatial control through controlled gas pulses or precise mechanical strikes, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser or mechanical tapping is used for ion formation in MAI, then ionization can be achieved, but temporal and spatial control precision is limited
Solution Approach 1:
The patent replaces laser-based or mechanical tapping methods with a pulsed valve system that uses controlled gas flow to generate shockwaves for ionization. This substitution achieves superior temporal control through precisely timed valve actuation and spatial control through directed gas flow, while avoiding the complexity of laser systems or precision mechanical tapping mechanisms.
Solution Approach 2:
The patent employs a pulsed valve system that utilizes controlled gas flow (pneumatics) to generate shockwaves for ionization. The valve rapidly opens and closes to create pulsed gas jets that impact the sample, providing both temporal control through pulse timing and spatial control through flow direction, thereby resolving the contradiction between control precision and device complexity.
2Manufacturing precision
If pulsed valve or piezoelectric cantilever is used for ionization, then temporal and spatial resolution is enhanced, but device complexity increases
Solution Approach 1:
The patent presents two alternatives: a pulsed valve system or a piezoelectric cantilever system. Both replace more complex laser-based methods. The piezoelectric cantilever specifically uses electro-mechanical coupling to achieve precise, localized impacts on the sample, providing high spatial resolution through focused strike points while maintaining relatively simple device architecture.
Solution Approach 2:
The piezoelectric cantilever implementation applies local quality by concentrating the ionization action at a specific localized point on the sample surface. The cantilever tip delivers focused mechanical energy to a small region, enabling high spatial resolution analysis of specific areas while keeping the overall device structure simple and manageable.
3Productivity
If traditional MAI methods are used, then ion formation occurs, but efficiency and precision for imaging are insufficient
Solution Approach 1:
The pulsed valve system employs periodic action by rapidly opening and closing the valve to generate a series of controlled gas pulses. This periodic pulsing creates repeated shockwaves that efficiently ionize the sample over time, improving overall ionization productivity while maintaining high precision through consistent, repeatable pulse timing and duration.
Solution Approach 2:
The system achieves continuity of useful action through high-frequency pulsing of the valve or rapid sequential operation of the piezoelectric cantilever. This continuous series of ionization events maintains steady ion production for imaging applications, improving productivity while the controlled nature of each pulse preserves measurement precision.
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 enhances the temporal and spatial resolution of ion formation, enabling more efficient and precise analysis of biological and chemical samples, with the pulsed valve method providing rapid ionization and the piezoelectric cantilever method offering localized ionization, both improving the accuracy of mass spectrometry imaging.
Implementation Method 1
an ionization device that is configured to direct a force at the back side of the sample substrate to propagate a shockwave
Implementation Method 2
The ionization device can have a piezoelectric cantilever with a precision striker positioned to impact a rear side of a metal foil attached to the sample mount
Data Source
AI summary
Mass spectrometry systems and methods including ionization devices are provided. The ionization device includes either a gas pulse valve or a piezoelectric striker. The ionization device is configured to direct force to the back of a substrate, where an analyte of interest is deposited on the front of the substrate. The impact ionizes the analyte and the ions are directed into a mass spectrometer for analysis.