Ion Source Gas Filtration and Flow Control for Biohazard Containment
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Solution Overview
Problem
Existing mass spectrometry systems face challenges in effectively containing biohazard samples, such as viruses, within the ion source enclosure, leading to a risk of unintentional sample escape into the ambient environment.
Innovation Solution
A gas flow system with a filter and flow sensor is integrated into the ion source to control and monitor the gas flow, ensuring that any sprayed sample is filtered and vented safely, using a branching manifold to maintain laminar flow and a controller to manage the system based on flow rate sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a gas flow system with filter and flow sensor is integrated into the ion source, then sample containment and biosecurity are improved, but device complexity increases
Solution Approach 1:
A gas flow system is introduced as an intermediary between the ion source enclosure and the ambient environment. This gas flow acts as a protective barrier that prevents sample escape while allowing the ion source to function normally. The system includes a filter that captures any escaped sample particles and a flow sensor that monitors the gas flow to ensure continuous protection.
Solution Approach 2:
A flow sensor is integrated into the gas flow system to provide real-time feedback on the gas flow rate. This feedback mechanism allows the system to detect any deviations from the expected flow pattern, which could indicate filter blockage or system malfunction. The feedback enables continuous monitoring and early detection of potential sample containment issues.
2Reliability
If active monitoring and control of gas flow is implemented, then biocontainment reliability is improved, but device complexity and cost increase
Solution Approach 1:
The flow sensor provides continuous feedback on the gas flow rate, enabling the system to monitor the effectiveness of the biocontainment措施. By comparing the actual flow rate with the expected flow rate, the system can detect potential failures in the sample containment system and alert operators or automatically adjust parameters to maintain reliable biocontainment.
Solution Approach 2:
The gas flow system is designed to maintain itself through continuous operation. The constant gas flow automatically clears any condensed sample from the enclosure walls, and the flow sensor continuously verifies that the system is functioning correctly, reducing the need for manual intervention and enhancing self-monitoring capabilities.
3Object-affected harmful factors
If gas flow is increased to improve sample containment, then sample escape prevention is improved, but spray generation stability may deteriorate
Solution Approach 1:
The gas flow is applied locally at specific regions within the ion source enclosure rather than uniformly throughout. This localized application allows the gas flow to effectively prevent sample escape at critical points (such as near the spray tip and enclosure openings) while minimizing interference with the spray generation process in the electrospray region.
Solution Approach 2:
The gas flow parameters (flow rate, pressure, composition) are carefully optimized to achieve the right balance between sample containment and spray stability. By adjusting these parameters, the system maintains sufficient gas flow to prevent sample escape while avoiding excessive flow that would disrupt the electrospray formation and ion generation.
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 setup reduces the risk of sample escape and exposure by actively monitoring and controlling the gas flow, ensuring biocontainment compliance and safety, particularly for biohazard samples.
Implementation Method 1
The gas flow system may comprise a fan/blower configured to cause the flow of gas through the sprayer enclosure and/or through a filter
Implementation Method 2
The gas flow system may comprise a flow sensor configured to sense a flow rate of the flow of gas
Implementation Method 3
A controller may be configured to actively monitor the flow rate sensed by the flow sensor and control the gas flow system and/or sprayer based on the monitoring
Implementation Method 4
Electrospray ionisation (ESI) is an ionisation technique where ions are generated or released from charged droplets generated via an electrospray process. Electrospraying can be carried out by liquid forming an interface with air at the tip of an emitter and electrostatic stress generated by electrification of the liquid via an applied voltage causing charged droplets to be emitted from the liquid interface
Data Source
AI summary
An analytical instrument is disclosed that comprises an ion source having a sprayer that generates a spray within an enclosure. A gas flow system causes a flow of gas through the enclosure, filters sample from the flow of gas, and senses a flow rate of the flow of gas. A controller controls the gas flow system and/or the sprayer based on the sensed flow rate.