Wiper for cleaning sampling needle

Abstract

The swab unit for cleaning sampling needle includes one swab body possessing one axial cavity, and one first fluid flow tube and one second fluid flow tube mounted onto and communicated with the swab body. The first fluid flow tube and the second fluid flow tube have some height difference in the gravity direction. The swab body has one first ring cavity and one second ring cavity around the axial cavity and with one hole separately. The first fluid flow tube, the first ring cavity and the axial cavity are communicated successively; and so do the second fluid flow tube, the second ring cavity and the axial cavity. The swab unit with ring cavities can eliminate the residual blood sample and dry the cleaning liquid completely in high cleaning effect.

Description

technical field [0001] The invention relates to the field of blood cell analysis equipment, in particular to a swab used in a blood cell analyzer. Background technique [0002] During the use of the blood cell analyzer, after the blood sample is drawn from the test tube, the blood sample will be left on the inner and outer surfaces of the sampling needle and the sample distribution channel. Before collecting the next sample for analysis, these residual blood samples need to be cleaned. In order to avoid affecting the detection of the next blood sample. [0003] In order to meet the cleaning requirements, the commonly used working principle is to use a flowing cleaning solution to wash away the blood sample adsorbed in the channel to be cleaned. This cleaning system usually includes: [0004] a) One or more containers containing cleaning fluid capable of generating positive pressure inside: [0005] Provides cleaning fluid to the system and provides power for the drive of ...

AI Technical Summary

Problems solved by technology

[0020] a. The cavity through which the sampling needle passes is divided into four sections. The difference from the swab in the 5,592,959 patent is that an acute-angled cone surface transition is added between the cavity with a smaller diameter in the upper section and the cavity with a larger diameter in the lower section. A cavity with a larger diameter is added at the liquid discharge port, which avoids the disadvantage of strict requirements on the diameter of the cavity at the liquid discharge port, but it is more difficult to manufacture the cavity of the fluffy suction section and the transition section of the acute-angle cone surface

[0021] b. The liquid inlet and the liquid discharge port are also respectively arranged on both sides of the sampling needle, which has the same disadvantages as the above-mentioned patents

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