Dual-Stage Sample ID Verification in Automatic Analyzers
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Solution Overview
Problem
Automatic analyzers face the risk of sample mismatch due to operator errors or malfunctions in sample identification, leading to incorrect analysis results, especially when samples are intermittently added or removed.
Innovation Solution
Implementing a dual-stage sample identification system using an information recording medium, such as a barcode, where the sample ID is read twice: once before and once immediately before or after dispensing, to verify the sample's identity and prevent mixing-up, along with a sample hand-contact preventing plate to prevent operator interference during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sample ID is read once before mounting position is stored, then operator time and effort is saved, but sample mismatch risk increases when operator changes sample position
Solution Approach 1:
The system performs preliminary reading and storage of sample ID information before the actual analysis process. The control unit stores the read sample ID and its mounting position in advance, allowing the analysis to proceed without repeated interruptions for ID verification, thus improving operational efficiency while maintaining reliability through the verification step.
Solution Approach 2:
The system implements a feedback mechanism where the sample ID is read again during the analysis process to verify it matches the previously stored ID. This feedback loop ensures that any position changes or mismatches are detected and can be corrected, maintaining high reliability while allowing efficient preliminary processing.
2Ease of operation
If sample position is changed during analysis, then sample accessibility is improved, but mismatch between analyzed sample and recognized sample occurs
Solution Approach 1:
The control unit performs a verification read of the sample ID during the analysis process and compares it with the previously stored ID. This feedback mechanism detects any position changes that would cause mismatch, ensuring that only correctly matched samples are analyzed, thus maintaining measurement precision while allowing operational flexibility.
Solution Approach 2:
The system dynamically adjusts its verification process based on the analysis stage. It allows position changes during certain phases but implements strict verification at critical points (before and during analysis), creating a dynamic balance between accessibility and accuracy requirements.
3Reliability
If dual-stage sample identification is implemented, then sample mixing-up risk is reduced, but system complexity increases
Solution Approach 1:
The control unit performs multiple functions using the same hardware components: it reads sample IDs at different stages, stores position information, verifies matches, and controls the analysis process. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in system complexity while achieving high reliability through dual-stage identification.
4Reliability
If sample ID verification is performed before and during dispensing, then sample mismatch is prevented, but analysis time increases
Solution Approach 1:
The system performs the first verification of sample ID in advance, before the dispensing process begins. This preliminary check ensures that the correct sample is selected, preventing mismatches early in the process. The verification is integrated into the workflow without creating separate bottlenecks, thus minimizing impact on analysis throughput while maintaining high reliability.
Data Source
AI summary
In an automatic analyzer, when a sample is newly added, all sample barcodes on a sample disk are read. Immediately before dispensing it, second time reading is performed, and the result thereof is checked against that of the first time reading. A sample hand-contact preventing plate is provided above the reading position and dispensing position in order to prevent the sample from being exchanged after the second time reading. This hand-contact preventing plate has a damage-preventing configuration to protect a hand and fingers of an operator against a sampling probe.