Automated Visual Inspection for Microbial Detection in Solutions
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Solution Overview
Problem
Current methods for inspecting injectable pharmaceuticals for contaminating particles and microbial growth are inefficient, leading to incorrect batch rejection or acceptance, and lack the sensitivity and accuracy needed for reliable quality control, especially in large containers.
Innovation Solution
A system utilizing a unique illumination and optical image system, combined with optimized fluid dynamics and motion profiles, separates particles by density and size, allowing for deterministic detection and measurement of contaminants within transparent containers, including those larger than 30 mm in diameter, using a toroidal liquid flow and velocity motion profiles to position particles in a defined inspection volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual or semi-automated inspection methods are used for detecting contaminating particles in injectable pharmaceuticals, then the inspection process is simple to implement, but the detection sensitivity and accuracy are insufficient leading to incorrect batch rejection or acceptance
Solution Approach 1:
The inspection system divides the container inspection into multiple viewing zones (front, back, left, right, top, bottom) that are sequentially imaged by rotating the container. This segmentation allows comprehensive coverage of the entire container contents while maintaining manageable system complexity through modular imaging sequences.
Solution Approach 2:
The system transitions from traditional 2D surface inspection to 3D volumetric inspection by rotating the container and capturing images from multiple angles and depths. This dimensional approach enables detection of particles throughout the entire solution volume, significantly improving detection sensitivity.
2Reliability
If 100% inspection of all containers is performed to achieve accurate contaminating particle incidence rate results, then the reliability of quality control improves, but the production time and cost increase
Solution Approach 1:
The system performs continuous inspection of containers through automated loading, rotating, and imaging sequences without interruption. Multiple containers are inspected in succession, maintaining continuous productive action while achieving 100% inspection coverage for accurate quality control data.
Solution Approach 2:
The system replaces manual mechanical inspection with automated optical imaging and computer-based particle detection algorithms. This substitution dramatically increases inspection speed while maintaining or improving detection accuracy, resolving the contradiction between reliability and productivity.
3Measurement precision
If traditional illumination and detection methods are used, then the device complexity is low, but the ability to detect particles resting at the bottom of containers is insufficient
Solution Approach 1:
The optical system is designed with multi-functional capability to detect particles in various positions within the container - suspended in solution, near walls, and resting at the bottom. The same imaging system achieves universal detection across all zones through rotational positioning and多角度 imaging.
Solution Approach 2:
The system changes imaging parameters including viewing angle, illumination intensity, and focus depth to optimize detection of particles at different positions. These parameter adjustments enable detection of bottom-resting particles without requiring fundamentally different detection mechanisms.
4Ease of operation
If Attribute Sampling Inspection Tables are used with raw visible particle inspection data, then the inspection process is simple, but the sensitivity and accuracy decrease leading to incorrect batch decisions
Solution Approach 1:
The system introduces an intermediary processing layer that transforms raw particle detection data into standardized inspection results compatible with sampling tables. This intermediary step includes particle sizing, filtering, and statistical analysis that bridges simple data collection with accurate batch decision-making.
Solution Approach 2:
The system implements feedback loops where inspection results are continuously analyzed and used to adjust inspection parameters and sampling strategies. This feedback mechanism improves both the simplicity of operation and the accuracy of batch decisions by learning from accumulated inspection data.
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 enables high-sensitivity sterility testing, reduces production time, improves sterilization accuracy, and provides a comprehensive tool for examining particle distribution and product stability, enhancing quality control while reducing costs by transforming probabilistic detection into deterministic measurement.
Implementation Method 1
A toroidal liquid flow in the sealed container was generated. The flow pattern was down at the walls across the bottom, up on the spin axis and across the meniscus to complete the flow pattern.
Implementation Method 2
the contributions of fluid dynamics in small vessels made it possible to precisely position contaminating particles within the container
Implementation Method 3
detection of particles by movement on the container bottom and in solution by orienting the sensor with a downward angle with respect to the axis of symmetry of the container; detecting at least one of light scatter, light reflection and light extinguishing caused by said particles
Implementation Method 4
detecting at least one of light scatter, light reflection and light extinguishing caused by said particles
Implementation Method 5
detecting at least one of light scatter, light reflection and light extinguishing caused by said particles
Implementation Method 6
An improved technology was developed in 2003 the described a unique illumination and optical image system that increased the sensitivity of the detection system
Data Source
AI summary
Essential prerequisites for any injectable product are its sterility, its freedom from pathogens and its freedom from visible particle contamination . . . . These requirements must be satisfied prior to the release of an injectable product batch for sale and use.A major difficulty in responding to these assay requirements is the need for a size sensitivity difference of 100 or greater in determining the presence of viable pathogenic organisms and of non-viable random particle contaminants. The wide dynamic testing range cannot be satisfied in current art with a single non-destructive testing station. The present invention uses a special agitation procedure to generate separate liquid volumes containing the small viable and larger non-viable particle contaminants. This separation makes possible the introduction of sensing systems that have been optimized for each size range and that can operate in parallel without interference.