Aseptic Workstation Airflow Circuit Pressure Control
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Solution Overview
Problem
Current aseptic processing isolators face challenges in controlling airflow and pressure without hardware modifications, particularly in restricted spaces like pharmacies and laboratories, and require efficient energy use and compact designs.
Innovation Solution
An aseptic processing workstation with an airflow circuit featuring independently controllable air supply and return fans, a restriction element, and valve means to manage pressure and airflow, allowing operation in both positive and negative pressure modes with minimal hardware changes and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional isolator designs with ducted or re-circulatory airflow systems are used, then sterilility control is achieved, but device complexity and energy consumption increase
Solution Approach 1:
The patent combines the air supply fan and air return fan into a single integrated airflow circuit, eliminating the need for separate ducted systems. The restriction element is positioned to create pressure differential that drives airflow through the chamber, merging multiple functions into a unified system that maintains sterility while reducing complexity
Solution Approach 2:
The airflow circuit is designed to serve multiple functions: it provides sterilility control through filtered air, enables both positive and negative pressure operation through fan speed adjustment, and supports both normal and recirculatory modes through the restriction element configuration. This multi-functionality reduces the need for separate specialized systems
2Stress or pressure
If isolators are designed for fixed pressure modes, then pressure control is achieved, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The patent employs variable speed fans that can dynamically adjust their rotation speed to change airflow rates and pressure differentials. The restriction element works in conjunction with the fans to enable continuous adjustment between positive and negative pressure modes, as well as between normal and recirculatory operation, providing adaptability without requiring hardware reconfiguration
3Reliability
If fresh air intake is increased in normal operating mode, then air quality improves, but energy loss increases
Solution Approach 1:
The system changes the operational parameters of the fans based on the operating mode. In recirculatory mode, the fans operate to circulate existing air with minimal fresh air intake, reducing energy loss. In normal mode, fresh air intake is increased to maintain air quality. The restriction element and valve means allow smooth transition between these parameter settings to optimize both air quality and energy efficiency
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
Enables flexible control of chamber pressure and airflow without hardware modifications, achieving energy savings and a more compact design, while maintaining sterility and safety during aseptic processing.
Implementation Method 1
the circuit comprising an air supply fan, an air return fan and a restriction element
Implementation Method 2
the restriction element is a filter or an orifice, which enables the creation of a pressure drop across the restriction element
Implementation Method 3
an inlet valve means, the first connection point being located between the restriction element and the air supply fan; an air outlet fluidly connected at a second connection point to the circuit via outlet valve means
Data Source
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AI summary
An aseptic processing workstation can include a processing chamber and an airflow circuit passing through the chamber. The circuit can include an air supply fan, an air return fan and a restriction element. The chamber is located in the circuit between the air supply fan and the air return fan. The restriction element is located in the circuit on the other side of the air supply fan and the air return fan to the chamber. The workstation can include an air inlet fluidly connected at a first connection point to the circuit via inlet valve means. The first connection point is located between the restriction element and the air supply fan. The workstation can include an air outlet fluidly connected at a second connection point to the circuit via outlet valve means.