Specimen Container Foam Detection Through Rotational Imaging
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Solution Overview
Problem
Existing systems for detecting microbial agents in specimen containers are inefficient and prone to errors due to foam interference, which affects the accuracy of determining fill level and microbial growth, leading to prolonged detection times and potential misdiagnosis.
Innovation Solution
An automated system with a housing, loading mechanism, agitation means, and detection units that includes a method for detecting foam in specimen containers before assessing microbial growth, using robotic transfer arms and climate-controlled chambers to enhance growth and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If foam is present in the specimen container, then the fill level determination and microbial growth detection are interfered with, but the detection time is prolonged and accuracy is reduced
Solution Approach 1:
The system performs preliminary foam detection and removal actions before the main microbial growth detection process. The foam detection unit identifies foam presence, and if detected, the system either removes the foam or adjusts the detection parameters in advance, preventing interference with subsequent fill level determination and microbial growth detection, thus maintaining accuracy without prolonging overall detection time
Solution Approach 2:
The foam detection unit acts as an intermediary component between the specimen container and the main detection system. It selectively detects foam and triggers appropriate responses (foam removal or parameter adjustment) before the interference can affect the primary detection functions, serving as a mediator that protects the main detection process from foam-related errors
2Measurement precision
If foam is present in the specimen container, then the fill level determination is interfered with, but manual foam removal increases operational complexity
Solution Approach 1:
The system performs self-service by automatically detecting foam through the foam detection unit and autonomously responding by either removing the foam or adjusting detection parameters. This eliminates the need for manual foam removal operations, maintaining operational simplicity while ensuring accurate fill level determination and microbial growth detection
Solution Approach 2:
The foam detection unit provides feedback about foam presence to the control system, which then automatically adjusts operational parameters or initiates foam removal. This closed-loop feedback mechanism enables the system to self-correct for foam interference without requiring manual intervention, preserving both measurement precision and ease of operation
3Reliability
If foam interferes with microbial growth detection, then detection accuracy is reduced, but additional detection steps increase system complexity
Solution Approach 1:
The foam detection unit is merged with the existing microbial growth detection system, sharing common components such as the optical detection path, light source, and control electronics. By combining foam detection functionality with the existing detection infrastructure, the system achieves reliable microbial growth detection without proportionally increasing overall system complexity
Solution Approach 2:
The detection system is designed with multi-functionality, where the same optical detection platform serves both foam detection and microbial growth detection purposes. This universal approach allows a single system to perform multiple detection functions, improving reliability without requiring separate dedicated systems for each function
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 system significantly reduces detection time and enhances accuracy by eliminating foam interference, allowing for rapid and precise identification of microbial agents in specimen containers.
Implementation Method 1
a foam detection unit for detecting the presence of foam in the specimen container
Implementation Method 2
agitation means for holding and/or agitating the specimen container to promote or enhance microorganism growth therein
Implementation Method 3
one or more heating means to provide a heated enclosure or incubation chamber
Data Source
Figure 1
Figure 2~4
Figure 5A~5B
AI summary
The present invention is directed to a method and apparatus for detecting foam in a specimen container. The method includes the following steps: transporting a specimen container into a locator well; centering the specimen container in the locator well; rotating the specimen container around a vertical axis in the locator well; imaging the specimen container during the rotation; analyzing an image of the specimen container captured during the rotation; and detecting foam in the specimen container based on the analysis of the image. An apparatus configured to perform the steps is also provided. The method and apparatus may be used in conjunction with a system for automatically determining whether a sample is positive for microorganism growth.