Sampling needle convenient for safe sampling of sample liquid

Abstract

The utility model discloses a sampling needle convenient for safe sampling of sample liquid, which comprises a sleeve, a liquid suction pipe and an exhaust pipe are arranged in the sleeve, a needle head is arranged at the lower end of the sleeve, and a liquid suction channel and an exhaust channel which are respectively communicated with the liquid suction pipe and the exhaust pipe are arranged in the needle head. The upper end of the liquid suction pipe and the upper end of the exhaust pipe are connected with a first quick connector and a second quick connector through pipelines respectively, and the first quick connector and the second quick connector are connected with external suction equipment and air pressure balance equipment respectively. According to the scheme, when the sampling needle is used for collecting sample liquid, the sampling needle can penetrate through the rubber body on the tube cover and extend into the sample tube to extract the sample liquid under the condition that the sample tube is not covered, so that the risk of biological infection caused by the fact that the sample tube is covered and sampled is avoided; meanwhile, air pressure balance inside and outside the sample pipe can be realized through the exhaust pipe, and the influence of negative pressure in the pipe on the liquid suction precision in the extraction process of the sample liquid is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of sample collection, and particularly relates to a sampling needle convenient for safely sampling sample liquid. Background Art

[0002] Sampling needles are widely used in medical sample collection. Traditional sampling needles generally use a single channel for sucking and discharging sample liquid. Their needle body strength is relatively low. And when such sampling needles sample the sample liquid in a sample tube with the lid removed, if the sample liquid is a high-risk biological sample, the sample liquid is likely to cause biological infection due to exposure to the air. When sampling the sample liquid in a sample tube without removing the lid, since there is a negative pressure inside the sample tube itself, the pressure difference between the inside and outside of the sample tube is relatively large. When the puncture needle enters the sample tube, the air inside the needle will be drawn into the tube under the action of the negative pressure. At this time, when the needle sucks liquid outward, it will be subject to an inward negative pressure resistance, resulting in insufficient suction volume and thus a certain deviation in liquid suction. Content of the Utility Model

[0003] Aiming at the above deficiencies of the prior art, the utility model provides a sampling needle convenient for safely sampling sample liquid, which solves the problem of poor liquid suction accuracy caused by the pressure difference between the inside and outside when sampling the sample liquid without removing the lid.

[0004] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0005] Provide a sampling needle convenient for safely sampling sample liquid, which includes a sleeve. An absorbent tube and an exhaust pipe are arranged inside the sleeve. A needle head is arranged at the lower end of the sleeve. An absorbent channel and an exhaust channel respectively communicating with the absorbent tube and the exhaust pipe are arranged inside the needle head. The upper ends of the absorbent tube and the exhaust pipe are respectively connected to a first quick-connect joint and a second quick-connect joint through pipelines. The first quick-connect joint and the second quick-connect joint are respectively connected to an external suction device and a pressure balance device.

[0006] Further, the needle head is cylindrical, a conical tip is arranged at the lower end of the needle head, and the radial dimension of the needle head is equal to the radial dimension of the sleeve.

[0007] Further, the lower port of the absorbent channel is arranged on the side wall of the needle head close to the conical tip, and the lower port of the exhaust channel is arranged on the side wall of the needle head close to its upper end.

[0008] Further, the distance between the lower port of the needle head and the conical tip is not greater than 1 mm.

[0009] Further, strip-shaped exhaust grooves are arranged on the extension directions of the outer side walls of the needle head and the sleeve.

[0010] Further, both the sleeve and the needle head are made of metal conductive materials.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. When the sampling needle of this solution collects the sample liquid, it can penetrate the rubber body on the tube cap and extend into the sample tube without removing the cap of the sample tube, and extract the sample liquid through the liquid suction tube, avoiding the risk of biological infection caused by sampling with the sample tube cap removed; at the same time, the air pressure balance inside and outside the sample tube can be achieved through the exhaust pipe, eliminating the influence of the negative pressure inside the tube on the liquid suction accuracy during the extraction of the sample liquid.

[0013] 2. This solution can adapt to various models of liquid flow pipelines through the first quick-connect joint and the second quick-connect joint, and achieve quick replacement.

[0014] 3. The conical needle tip of this solution reduces the resistance when the needle penetrates the rubber body. At the same time, the strip-shaped exhaust groove can start exhausting when the needle penetrates the rubber body, so as to achieve the purpose of timely pressure relief.

[0015] 4. The sampling needle of this solution adopts a nested design of the liquid suction tube, the exhaust pipe and the sleeve, greatly increasing the structural strength of the sampling needle. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the sampling needle of this solution.

[0017] Figure 2 It is a partial structural schematic diagram of the needle tip of this solution.

[0018] Figure 3 It is a partial cross-sectional view of the needle tip of this solution.

[0019] Among them, 1. Sleeve, 2. Liquid suction tube, 3. Exhaust pipe, 4. Needle tip, 5. Liquid suction channel, 6. Exhaust channel, 7. First quick-connect joint, 8. Second quick-connect joint, 9. Conical needle tip, 10. Strip-shaped exhaust groove. Specific Embodiments

[0020] The specific embodiments of the present utility model are described below to facilitate those skilled in the art of this technology to understand the present utility model. However, it should be clear that the present utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present utility model defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the present utility model are within the scope of protection.

[0021] Such as Figures 1 to 3As shown in the figure, the sampling needle of this solution for safe sampling of the sample liquid includes a sleeve 1. Inside the sleeve 1, a liquid suction pipe 2 and an exhaust pipe 3 are arranged. At the lower end of the sleeve 1, a needle head 4 is provided. Inside the needle head 4, a liquid suction channel 5 and an exhaust channel 6 that are respectively communicated with the liquid suction pipe 2 and the exhaust pipe 3 are arranged. The upper ends of the liquid suction pipe 2 and the exhaust pipe 3 are respectively connected to a first quick-connect joint 7 and a second quick-connect joint 8 through pipelines. The first quick-connect joint 7 and the second quick-connect joint 8 are respectively connected to an external suction device and a pneumatic balance device; among them, the first quick-connect joint 7 and the second quick-connect joint 8 can be adapted to various types of liquid flow pipelines and achieve quick replacement.

[0022] When the sampling needle of this solution is used to collect the sample liquid, without removing the cover of the sample tube, the sampling needle can penetrate the rubber body on the tube cover and extend into the sample tube, and extract the sample liquid through the liquid suction pipe 2, avoiding the risk of biological infection caused by sampling with the sample tube cover removed; at the same time, through the exhaust pipe 3, the air pressure balance inside and outside the sample tube can be achieved, eliminating the influence of the negative pressure inside the tube on the liquid suction accuracy during the extraction of the sample liquid.

[0023] In the design, the needle head 4 is cylindrical, and a conical tip 9 is provided at the lower end of the needle head 4 to reduce the resistance when the needle head 4 penetrates the rubber body; the radial dimension of the needle head 4 is equal to the radial dimension of the sleeve 1, so as to facilitate the smooth penetration of the sampling needle into the sample tube.

[0024] The lower port of the liquid suction channel 5 is arranged on the side wall of the needle head 4 close to the conical tip 9, to prevent the rubber body from remaining in the needle head 4 when the needle head 4 penetrates the rubber body on the tube cover. The distance between the lower port of the needle head 4 and the conical tip 9 is not greater than 1 mm, to ensure that the sampling needle can complete the inhalation and exhalation of a smaller volume; the lower port of the exhaust channel 6 is arranged on the side wall of the needle head 4 close to its upper end; making it have a certain distance from the lower port of the liquid suction channel 5.

[0025] On the extending direction of the outer side walls of the needle head 4 and the sleeve 1, a strip-shaped exhaust groove 10 is provided. The strip-shaped exhaust groove 10 can enable the needle head 4 to start exhausting when penetrating the rubber body, so as to achieve the purpose of timely pressure relief.

[0026] Both the sleeve 1 and the needle head 4 of this solution are made of metal conductive materials, so that the needle head 4 can be connected to an external capacitance detection device through the sleeve 1. When the needle head 4 touches the sample liquid, the capacitance value detected by the capacitance detection module of the sampling needle will change, so as to judge that the needle head 4 touches the sample liquid, facilitating the automatic collection of the sample liquid by the sampling needle in combination with an external automated device.

Claims

1. A sampling needle for facilitating safe sampling of sample liquid, characterized in that: It includes a sleeve, in which a liquid suction pipe and an exhaust pipe are arranged, a needle is arranged at the lower end of the sleeve, a liquid suction channel and an exhaust channel respectively connected to the liquid suction pipe and the exhaust pipe are arranged in the needle, the upper ends of the liquid suction pipe and the exhaust pipe are respectively connected to a first quick-connect joint and a second quick-connect joint through pipelines, and the first quick-connect joint and the second quick-connect joint are respectively connected to an external suction device and an air pressure balancing device.

2. The sampling needle for facilitating safe sampling of sample liquid according to claim 1, characterized in that: The needle is cylindrical, a conical needle tip is arranged at the lower end of the needle, and the radial dimension of the needle is equal to the radial dimension of the sleeve.

3. The sampling needle for facilitating safe sampling of sample liquid according to claim 2, characterized in that: The lower port of the liquid suction channel is arranged on the side wall of the needle close to the conical needle tip, and the lower port of the exhaust channel is arranged on the side wall of the needle close to the upper end thereof.

4. The sampling needle for facilitating safe sampling of sample liquid according to claim 2, characterized in that: The distance between the lower port of the needle and the conical needle tip is no more than 1 mm.

5. The sampling needle for facilitating safe sampling of sample liquid according to claim 1, characterized in that: Strip-shaped exhaust grooves are arranged in the extending direction of the outer side walls of the needle and the sleeve.

6. The sampling needle for facilitating safe sampling of sample liquid according to claim 1, characterized in that: The sleeve and the needle are both made of metallic conductive material.

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