Secondary guide puncture needle device with bottle cap pressing function

Abstract

The invention discloses a secondary guide puncture needle device with a bottle cap pressing function. The secondary guide puncture needle device comprises a support, a puncture needle, a ventilation needle, a first driving mechanism, a second driving mechanism and a secondary guide mechanism. The first driving mechanism and the second driving mechanism are arranged on the upper portion of the support, the secondary guide mechanism comprises a guide block, a guide shaft, a ball bushing and a first guide sleeve, the puncture needle and the first guide sleeve are connected with the first driving mechanism, the first guide sleeve and the ball bushing are jointly arranged on the guide shaft in a sleeving mode, and the ball bushing is used for being connected with the first guide sleeve in a rolling friction sleeving mode. The length of the ball bushing is half of the descending stroke of the puncture needle, the ball bushing is fixedly connected with the guide block, the guide block is clamped on the guide shaft to balance the gravity of the guide block, and the middle part of the puncture needle is connected with the side part of the guide block in a penetrating manner. The ventilation needle is arranged on the guide shaft, and the second driving mechanism is connected with the guide shaft to control the ventilation needle to move up and down. The device can adapt to headspace bottles with different heights, the puncture and spit extraction function is effectively completed, and cross contamination is reduced.

Description

technical field [0001] The invention belongs to the technical field of experimental instruments, in particular to a secondary guiding puncture needle device with the function of pressing a bottle cap. Background technique [0002] Liquid samples are volatile and photolyzed, and are usually packaged and stored in headspace bottles; when liquids need to be extracted or injected, usually a pointed capillary (hereinafter referred to as a puncture needle) is inserted into the bottle, and the liquid is pumped out through the inner wall. pipetting. Generally, there will also be an additional ventilation channel (hereinafter referred to as a ventilation needle) connected to the atmosphere to prevent the positive and negative air pressure changes in the bottle from affecting the smoothness of the suction when the liquid is pumped. [0003] As the capacity of the headspace bottle increases, the height of the bottle usually increases accordingly. The problem with dealing with the larg...

AI Technical Summary

Problems solved by technology

This approach has problems: because the cross-section of the puncture needle becomes larger, it is easy to cut off the silicone sealing sheet of the headspace bottle during repeated punctures, and the cut debris enters the flow path or blocks the flow path with the puncture needle, or even Causes irreversible damage and is expensive to manufacture

[0005] Another solution is to make the puncture needle into a trocar structure, figure 1 Shown are two different types of trocar structures, the inner needle is thin and long, and the outer needle is thick and short, which can be compatible with small puncture area, needle rigidity and large disturbance, and the outer needle also has the function of ventilation needle, such as figure 2 The enlarged view of the end of one of the trocars is shown, and the outer wall is provided with a ventilation hole connected to the external air, as shown in image 3 The enlarged view of the end of another type of trocar is shown. An additional ventilation needle is designed on the outer wall to connect the internal and external air through the ventilation needle. However, liquid will enter the inside of the outer needle during the puncture of this trocar structure. , the outer needle needs to be additionally cleaned when washing the needle and cannot be cleaned effectively, and the residual liquid causes cross-contamination between samples

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