Rotatable Sample Needle for Analyzer Wear Reduction
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Solution Overview
Problem
The correct operation of moving parts in a sample separation device combined with a reliable liquid supply through a capillary is challenging due to mechanical loads and wear issues.
Innovation Solution
A rotatably mounted sample needle with a lumen for passing fluidic samples is used, allowing it to rotate about its own axis relative to a moving apparatus, which compensates for mechanical loads and reduces wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sample needle is used for liquid supply through a capillary in a sample separation device, then reliable liquid supply is achieved, but mechanical loads and wear increase
Solution Approach 1:
The sample needle is made rotatable relative to the moving apparatus, allowing it to dynamically adjust its orientation. This rotational degree of freedom enables the needle to compensate for mechanical loads during movement, reducing wear on both the needle and the capillary connection, thereby extending service life while maintaining reliable liquid supply.
2Device complexity
If the sample needle is fixed relative to the moving apparatus, then structural simplicity is maintained, but mechanical stress on the sample receiving volume increases
Solution Approach 1:
A rotational joint is introduced between the sample needle and the moving apparatus, adding a degree of freedom that allows the needle to rotate independently. This dynamic configuration enables the needle to align with the sample receiving volume during insertion and withdrawal, minimizing mechanical stress on the volume while maintaining relatively simple overall structure.
3Duration of action of moving object
If the sample needle is made rotatable, then wear is reduced and service life increases, but device complexity increases
Solution Approach 1:
A simple rotational joint is implemented between the sample needle and the moving apparatus, allowing the needle to rotate about its own axis. This relatively simple mechanical addition provides the necessary degree of freedom to reduce wear during needle insertion and withdrawal operations, extending service life without significantly complicating the overall device structure.
Data Source
AI summary
A sample handling device for handling a fluid sample in an analyzer for analyzing the fluid sample includes a sample needle having a lumen (197) through which the fluid sample can be passed, and a movement apparatus for moving the sample needle. The sample needle is rotatably mounted with respect to the movement apparatus.