Isolation Device with Dynamic Particle Thresholds
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Solution Overview
Problem
Current methods for managing fine particles in sterile medicinal product production environments, such as safety cabinets and isolators, fail to precisely control particle sizes beyond 0.5 μm, leading to potential contamination and defective products, as they do not account for varying generation ratios of different particle sizes during work and non-work periods.
Innovation Solution
An isolation device equipped with a measurement probe, particle counter, storage unit, cleanliness determination unit, and alarm system that measures and compares fine particle concentrations of multiple sizes, issuing alerts when exceeding set limits for work and non-work times to maintain precise cleanliness standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single threshold value for fine particles is used for both work and non-work periods, then the management system is simple, but it cannot precisely manage particle contamination during different operational states
Solution Approach 1:
The patent applies dynamics by making the threshold value changeable based on operational state. The system switches between a first threshold value during work periods and a second threshold value during non-work periods, allowing the management criteria to adapt dynamically to different operational conditions rather than using a static single threshold.
Solution Approach 2:
The patent changes the parameter of threshold values based on operational state. By setting different threshold values for work and non-work periods, the system precisely manages fine particle contamination levels appropriate to each state, improving measurement precision without requiring complex additional hardware.
2Measurement precision
If multiple threshold values for different particle sizes are used, then particle management precision is improved, but the management system becomes complex
Solution Approach 1:
The patent changes the threshold value parameter based on operational state (work vs. non-work periods). By dynamically adjusting the threshold value according to whether the system is in work or non-work mode, it achieves precise particle management for different sizes without requiring an overly complex management system.
3Object-affected harmful factors
If cleaned air is supplied from the upper part of the workspace, then fine particles are prevented from entering the workspace, but the air cannot be reused when handling infectious samples
Solution Approach 1:
The patent implements feedback by monitoring fine particle concentrations and using this information to control air supply and threshold values. The system continuously measures particle levels and adjusts operations accordingly, enabling informed decisions about air management and contamination control.
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 solution enables precise management of fine particles across various sizes, preventing contamination and ensuring compliance with cleanliness standards, thereby producing high-quality sterile medicinal products.
Implementation Method 1
a particle counter which measures and outputs the number of fine particles having a plurality of particle sizes of air in the workspace taken in by the measurement probe
Data Source
AI summary
An isolation device for supplying a workspace with clean air resulting from dust filtration by an air cleaning means accurately manages the number of fine particles in a workspace and prevents fine particles from mixing with an experimental material. The isolation device includes a measurement probe; a particle counter for measuring the fine-particle counts for a plurality of particle sizes in the workspace air and outputting the measurements; a storage unit for storing, for each of the plurality of particle sizes and for work times and non-work times, management fine-particle counts at which the number of fine particles per unit volume is determined to be large; a cleanliness determination unit that compares the fine particle counts and the management fine-particle counts; and an output unit for outputting an alarm when the work-time/non-work time fine particle count for a particle size in the workspace exceeds the corresponding management fine-particle count.