Automated Cascade Impactor Stage Separation
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Solution Overview
Problem
Conventional Andersen Cascade Impactors for measuring particle size distribution are labor-intensive, time-consuming, and prone to operator-induced variability, leading to high costs and delays in drug approval processes due to low throughput and inconsistent data.
Innovation Solution
An Automated Cascade Impactor that uses an Extension Mechanism to automate the coupling and separation of impactor stages, along with Isolation Stages for automated sample collection and cleaning, reducing human error and increasing efficiency through robotic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual operation of conventional Andersen Cascade Impactor is used, then device complexity is reduced, but productivity is significantly decreased and operator-induced variability increases
Solution Approach 1:
The automated cascade impactor performs self-service through automation mechanisms that automatically assemble impactor stages, control airflow, collect samples, and disassemble components without operator intervention. The system serves itself by integrating motors, controllers, and standardized interfaces that enable autonomous operation throughout the dose determination process.
Solution Approach 2:
The impactor is segmented into modular stages that can be independently assembled and disassembled by the automation mechanism. Each stage contains standardized components (impaction plates, jets, seals) that are systematically positioned by the automation system, allowing efficient reconfiguration and cleaning between tests while maintaining measurement precision.
2Loss of time
If manual assembly and disassembly of impactor stages is performed, then device complexity is minimized, but loss of time increases due to labor-intensive operations
Solution Approach 1:
The automation mechanism performs preliminary actions by pre-assembling impactor stages with proper sealing and positioning before sample introduction. Components are pre-positioned in standardized configurations, and airflow paths are pre-established, eliminating time-consuming manual setup procedures while maintaining impactor integrity.
Solution Approach 2:
Manual mechanical operations of assembling, sealing, and disassembling impactor stages are replaced by an automated mechanical system with motors, actuators, and controllers. This substitution eliminates human factors causing variability and significantly reduces the time required for stage configuration and sample preparation.
3Measurement precision
If conventional manual cascade impactor is used, then manufacturing precision requirements are simplified, but measurement precision decreases due to operator-induced variability
Solution Approach 1:
The automation system incorporates feedback mechanisms that monitor and control critical parameters such as airflow rate, stage positioning, and sample collection timing. Sensors detect deviations from predetermined specifications and automatically adjust operations to maintain measurement precision, eliminating operator-induced variability in particle size distribution data.
Solution Approach 2:
The automation mechanism precisely controls critical parameters including airflow velocity, stage assembly tightness, and sample collection timing. By maintaining these parameters within predetermined ranges through automated control rather than manual adjustment, the system ensures consistent and reproducible measurement results across multiple dose determinations.
4Productivity
If automated cascade impactor is implemented, then productivity is significantly increased, but ease of operation decreases due to complex automation mechanisms
Solution Approach 1:
The automation mechanism is designed as a universal system that performs multiple functions: assembling impactor stages, sealing joints, controlling airflow, collecting samples, and disassembling components. This multi-functionality consolidates what would otherwise require multiple separate operations or operators into a single integrated system, maintaining ease of operation while maximizing productivity.
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
The Automated Cascade Impactor significantly increases throughput, allowing multiple Dose Determinations per day and eliminating operator-induced variability, thereby reducing the time and cost associated with drug development and regulatory submissions.
Implementation Method 1
as the drug suspended in an aerosol stream is delivered into the throat of the impactor and into the set of impaction stages, at each Impaction Stage, the aerosol stream passes through the jets or orifices and impacts upon the Impaction Plate
Data Source
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AI summary
An automated cascade impactor comprises an extension mechanism operable to couple to a plurality of impactor stages. The extension mechanism is operable to compress and separate impactor stages of the plurality of impactor stages via automation. The system provides a plurality of isolation stages operable to be automatically inserted between respective impactor stages when the impactor stages are separated by the extension mechanism. The system provides the plurality of isolation stages to be automatically compressed between impactor stages to isolate each impactor stage from at least one adjacent impactor stage. The plurality of isolation stages is operable to be automatically uncompressed and removed from between the impactor stages. The isolation stages allow automated extraction of particulate matter, cleaning and drying of interior surfaces of each impactor stage.