Sampling Assembly Negative Pressure Control for Single Puncture
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Solution Overview
Problem
Blood cell analyzers face accuracy issues due to pressure in sealed test tubes, requiring multiple punctures and needle cleaning, which slows down the sampling process.
Innovation Solution
A sampling assembly with a sampling needle, pipelines, and switching members that control pressure, allowing for a single puncture by connecting to a negative pressure source and atmosphere, eliminating the need for pretreatment and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sampling needle performs puncture pretreatment to release pressure in the test tube, then the pressure problem is solved, but the sampling speed decreases due to multiple punctures and cleaning steps
Solution Approach 1:
The system applies negative pressure to the sampling needle and pipeline before puncture to prepare for direct sampling without pretreatment puncture. The negative pressure source creates a pressure difference that enables direct sample aspiration, eliminating the need for preliminary pressure-releasing puncture
Solution Approach 2:
The system changes the pressure parameter by applying negative pressure to the sampling needle and pipeline. This pressure change enables direct puncture and sampling without the need for pretreatment, resolving the contradiction between sampling accuracy and speed
2Reliability
If the sampling needle is cleaned between punctures, then contamination is prevented, but the measurement time increases
Solution Approach 1:
The cleaning step is completely removed from the sampling process. The system uses a separate negative pressure pipeline that does not require cleaning between uses, extracting the time-consuming cleaning operation from the critical sampling path
Solution Approach 2:
The negative pressure pipeline is prepared in advance and remains ready for use. By having the negative pressure source and pipeline pre-configured, the system eliminates the need for post-puncture cleaning while maintaining sample purity
3Reliability
If the sampling needle performs multiple punctures, then pressure release and sampling are achieved, but the needle life decreases
Solution Approach 1:
Negative pressure is applied to the sampling needle before puncture, preparing it for direct sampling. This preliminary pressure application enables the needle to perform only one puncture action, extending its service life by eliminating repeated puncture cycles
Solution Approach 2:
The pressure parameter is changed by applying negative pressure to the needle, which fundamentally alters the sampling mechanism from multiple punctures to a single puncture with continuous negative pressure aspiration, thereby extending needle durability
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 method reduces sampling time, improves measurement speed, and extends the life of the sampling needle by eliminating the need for multiple punctures and cleaning.
Implementation Method 1
a second pipeline, the second pipeline being capable of connected to a negative pressure source via the second switching member
Data Source
AI summary
A sampling assembly, including a sampling needle, a first pipeline, a second pipeline, a driving member, a first switching member, and a second switching member, is disclosed. The first pipeline is connected between the sampling needle and the first switching member. The second pipeline is connected between the first switching member and the driving member. The first switching member is used for connecting or disconnecting the first pipeline and the second pipeline. The second pipeline is connected, by means of the second switching member, to a negative pressure source. The sampling time of the sampling assembly of the present disclosure is relatively short. The present disclosure further discloses a sample analyzer and a sampling method.