CN113843229B - Sampling needle cleaning device and sampling needle cleaning system applying same - Google Patents

Abstract

The invention provides a sampling needle cleaning device and a sampling needle cleaning system using the same, wherein the sampling needle cleaning device comprises a body, a cleaning channel for accommodating a sampling needle is arranged along the axial direction of the body in a penetrating manner; when the sampling needle is cleaned in the cleaning channel, the sampling needle is in clearance fit with the cleaning channel; the body comprises a connecting body and cover bodies covering two ends of the connecting body, wherein two ends of the connecting body are respectively provided with a concave part, the cover bodies are provided with convex parts, the convex parts extend into the concave parts and are matched with the concave parts to form cavities, the cavities are all arranged around the circumference of the cleaning channel, and the range of the cavities arranged around the circumference of the cleaning channel is less than one circle; the connector is also provided with a liquid inlet and a liquid outlet which are respectively communicated with the corresponding cavities, and the cavities are communicated with the cleaning channel and the liquid inlet and the liquid outlet have height difference in the gravity direction. In the scheme, the structure of the inner flow channel of the sampling needle cleaning device can be effectively simplified, and the influence on cleaning of the sampling needle caused by carrying pollution in the flow channel is avoided.

Description

Sampling needle cleaning device and sampling needle cleaning system using the device

technical field

The invention belongs to the field of medical auxiliary equipment, in particular to a sampling needle cleaning device and a sampling needle cleaning system using the device.

technical background

When the human blood sample needs to be analyzed and tested, after the sampling needle draws the blood sample from the test tube, the blood sample will be left on the outer surface of the sampling needle. Before collecting the next sample, these residual blood samples need to be cleaned to avoid damage to the next The detection of a blood sample produces contamination effects.

When the sampling needle cleaning device currently on the market cleans the sampling needle, the sampling needle is put into the cleaning device, and the cleaning liquid enters the cleaning device through external positive pressure to clean the sampling needle. Aspirate from cleaning unit. However, due to the unreasonable design of the internal structure of the existing sampling needle cleaning device, there is a cleaning dead zone in the cleaning device, which affects subsequent cleaning of the sampling needle. For example: in order to realize all-round cleaning of the sampling needle, multiple liquid inlet holes are arranged around the sampling needle on the cleaning device. Although such a structural design realizes all-round cleaning of the sampling needle, the flow cross-sectional area of the liquid inlet hole is small. It is difficult to clean itself, and the contaminated liquid is easy to remain in the flow channel, which affects the subsequent cleaning of the sampling needle.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a sampling needle cleaning device and a sampling needle cleaning system using the device, so as to avoid cleaning dead zones in the cleaning device.

In order to achieve the above purpose and other related purposes, the present invention provides a sampling needle cleaning device, which includes a body, and a cleaning channel for accommodating the sampling needle is opened along the axial direction of the body; when the sampling needle is cleaned in the cleaning channel, and The cleaning channel has a clearance fit;

The body includes a connecting body and a cover covering both ends of the connecting body, both ends of the connecting body are provided with recesses, and the cover is provided with protrusions respectively used to cooperate with the recesses, the The protruding part extends into the recessed part and cooperates with the recessed part to form a cavity, and the cavities are all arranged around the circumference of the cleaning channel, and the range of the cavities around the circumference of the cleaning channel is less than one circle, and the cavity and the The cleaning channel is connected;

The connecting body is also provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the corresponding cavity, and the liquid inlet and the liquid outlet have a height difference in the direction of gravity.

Further, the cross-sectional area of the cleaning channel in the direction of its axis is circular.

Further, the cavity is in the shape of 1/2 ring, 1/4 ring or 3/4 ring.

Further, the body is also provided with a marking part for aligning the liquid inlet and the liquid outlet with their corresponding cavities. Further, a communication channel is provided between the cavity and the cleaning channel, and the communication channels respectively communicate the cleaning channel with the corresponding cavity, and the communication channels are all opened between the cavity and the cleaning channel. on the side wall.

Further, the communication channel communicates with both ends of the same cavity and passes through the cleaning channel.

Further, the cavities are respectively a first cavity and a second cavity, the first cavity communicates with the liquid inlet, and the second cavity communicates with the liquid outlet.

Further, the communication channels are respectively a first communication channel and a second communication channel, the first communication channel communicates with the cleaning channel and the first cavity, and the second communication channel communicates with the cleaning channel and the second cavity, so The opening position of the first communication channel on the body is higher than the bottom surface of the first cavity.

Further, the flow cross-sectional area of the first cavity is larger than the flow cross-sectional area of the liquid inlet.

Further, the flow cross-sectional area of the second cavity is equal to the flow cross-sectional area of the liquid outlet.

Further, the covers are respectively a first cover and a second cover, and the protruding part on the first cover extends into the connecting body to form the first cavity with the connecting body, and the second cover The protruding part on the body protrudes into the connecting body to form the second cavity with the connecting body.

Further, the identification part is a groove provided on the circumference of the first cover, the connecting body and the second cover, and the groove is parallel to the axis of the body. When the groove is butted up and down, the liquid inlet The mouth and the liquid outlet are aligned with their corresponding cavities.

Further, the identification part is a detent surface arranged on the circumference of the first cover body, the connecting body and the second cover body. When the detent surfaces are all on the same plane, the liquid inlet and the liquid outlet Align with its corresponding cavity.

Further, the cleaning channel includes an accommodation section, a buffer section, a cleaning section and a guide section that are sequentially opened on the body from bottom to top, the accommodation section is opened on the first cover, and the buffer section is opened on the connecting body Above, the cleaning section and the guiding section are provided on the second cover.

Further, the inner diameters of the guide section, the buffer section, the cleaning section and the containing section increase sequentially.

In order to achieve the above purpose and other related purposes, the present invention provides a sampling needle cleaning system, including a liquid inlet pump, a waste liquid pump, and the above-mentioned sampling needle cleaning device, the liquid inlet pump communicates with the liquid inlet, and the waste liquid The liquid pump communicates with the liquid outlet.

As mentioned above, the sampling needle cleaning device of the present invention and the sampling needle cleaning system using the device have the following beneficial effects:

In this solution, the flow channel only has a liquid inlet, a liquid outlet, a cleaning channel, and a cavity, and these flow channels have large flow cross-sectional areas and are easy to clean. Moreover, the range of the cavity surrounding the cleaning channel is less than one circle. Compared with the cavity around the cleaning channel, it can effectively simplify the flow channel structure in the sampling needle cleaning device, and avoid contamination in the flow channel from affecting the cleaning of the sampling needle.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a sampling needle cleaning device in an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second cover in an embodiment of the present invention.

Fig. 3 is a schematic diagram of the structure of the linker in the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the first cover in the embodiment of the present invention.

Detailed ways

The reference signs in the drawings of the description include: liquid inlet 1, liquid outlet 2, first cavity 3, second cavity 4, first communication channel 5, second communication channel 6, connecting body 7, first Cover body 8 , second cover body 9 , protruding portion 10 , recessed portion 11 , groove 12 , anti-rotation surface 13 , accommodation section 14 , buffer section 15 , cleaning section 16 , and guide section 17 .

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Example

As shown in Figures 1 to 4, this embodiment provides a sampling needle cleaning device, which includes a body and a liquid inlet 1 and a liquid outlet 2 arranged on the body. The flow cross-sectional area of the liquid inlet 1 is smaller than that of the outlet. Flow cross-sectional area of liquid port 2. The liquid inlet 1 and the liquid outlet 2 are arranged on the same side of the body, the axes of the liquid inlet 1 and the liquid outlet 2 are parallel, and the liquid inlet 1 and the liquid outlet 2 have a height difference in the direction of gravity.

The main body includes a connecting body 7, a first cover 8 and a second cover 9, the two ends of the connecting body 7 are provided with recesses 11, the first cover 8 and the second cover 9 are provided with protrusions 10, the second The protruding part 10 of a cover 8 extends into the concave part 11 at one end of the connecting body 7 to form an arc-shaped first cavity 3, and the protruding part 10 on the second cover 9 extends into the other end of the connecting body 7 An arc-shaped second cavity 4 is formed in the concave portion 11 of the body. The first cavity 3 communicates with the liquid inlet 1 , and the second cavity 4 communicates with the liquid outlet 2 . The flow cross-sectional area of the first cavity 3 is larger than that of the liquid inlet 1 to ensure the flow rate of the cleaning liquid. The cross-sectional area of the second cavity 4 is equal to the cross-sectional area of the liquid outlet 2 to ensure the outflow speed of the cleaning liquid.

A cleaning channel is opened through the body along the axis of the body, and the cross-sectional area of the cleaning channel in the direction of the axis is circular. Both the first cavity 3 and the second cavity 4 are arranged around the circumference of the cleaning channel, and the range in which the first cavity 3 and the second cavity 4 are arranged around the circumference of the cleaning channel is less than one circle. In this embodiment, both the first cavity 3 and the second cavity 4 can be set as 1/2 ring, 1/4 ring, 3/4 ring, etc., only the first cavity 3 and the second cavity 4. The volume can meet the flow demand of cleaning liquid when cleaning the sampling needle. In this solution, the first cavity 3 and the second cavity 4 are set less than one circle around the circumference of the cleaning channel. Compared with setting the first cavity 3 and the second cavity 4 in one circle, it can effectively reduce the number of sampling needles. The cleaning area of the internal flow channel of the cleaning device.

The cleaning channel includes, from bottom to top, an accommodating section 14 , a buffer section 15 , a cleaning section 16 and a guiding section 17 arranged coaxially. The inner diameters of the guide section 17, the buffer section 15, the cleaning section 16, and the accommodation section 14 increase successively, and the inner diameter of the guide section 17 is slightly larger than the sampling needle, so that the sampling needle enters the guide section 17 and cooperates with the guide section 17 in clearance, and the sampling needle is lifted. To guide and limit, to ensure that the direction of travel of the sampling needle coincides with the axis of the cleaning channel. The upper and lower ends of the guide section 17 are provided with chamfered transitions to facilitate fluid flow in the cleaning channel and avoid turbulent flow. The inner diameter of the buffer section 15 is smaller than that of the cleaning section 16. During the cleaning process of the sampling needle, it is beneficial for the cleaning liquid to flow out smoothly. During the drying process of the sampling needle, the air flow rate in the cleaning section 16 is guaranteed to clean and dry the puncture needle. The upper and lower ends of the buffer section 15 are provided with chamfered transitions, which is conducive to the slow acceleration of the cleaning liquid. The inner diameter of the accommodating section 14 is the largest, so as to prevent pollutants from adhering to the inner wall of the cleaning channel during the cleaning process.

The accommodating section 14 is set on the first cover 8 and communicates with the first cavity 3, the buffer section 15 is set on the connecting body 7, the cleaning section 16 and the guide section 17 are all set on the second cover 9, and the cleaning section 16 communicates with the second cavity 4 . Between the receiving section 14 and the first cavity 3, there is a first communication channel 5 for communicating with the two. Both ends of a cavity 3 pass through the receiving section 14 , and the first communication channel 5 is opened at the top of the first cavity 3 . Between the cleaning section 16 and the second cavity 4, there is a second communication passage 6 for communicating the two. The second communication passage 6 is opened on the protrusion 10 of the second cover 9, and the second communication passage 6 communicates with the first The two ends of the cavity 4 pass through the cleaning section 16 . The width of the second communication channel 6 is consistent with the inner diameter of the cleaning section 16, and the height of the second communication channel 6 is consistent with the height of the second cavity 4, so as to ensure that the cleaning liquid can quickly enter the second cavity 4 from the second communication channel 6, Then go out from the second chamber 4.

In this embodiment, the first communication channel 5 and the second communication channel 6 are linear, so that the liquid at both ends of the first cavity 3 flows into the cleaning section 16 through the first communication channel 5, which is different from the existing surrounding sampling needle. Compared with two holes, the cross-sectional areas of the first communication channel 5 and the second communication channel 6 in this solution are much larger than the respective cross-sectional areas of the existing multiple holes around the sampling needle. The liquid in the first cavity 3 pours into the cleaning section 16 from the first communication channel 5 at both ends of the first cavity 3 to wrap and clean the sampling needle, thus ensuring the all-round cleaning of the sampling needle. And compared with the existing multi-directional cleaning of the sampling needle with multiple holes, the cleaning of the first communication channel 5 and the second communication channel 6 in this solution will be more convenient, and the inner flow channel structure of the sampling needle cleaning device will be simplified.

In addition, the main body is provided with identification parts for aligning the liquid inlet 1 with the first cavity 3 and the liquid outlet 2 with the second cavity 4, and the identification parts are respectively arranged on the connecting body 7, the first cover body 8 and the On the second cover 9. The identification portion in this embodiment can be a groove 12 provided on the circumference of the first cover body 8, the connecting body 7 and the second cover body 9, the groove 12 is parallel to the axis of the body, and when the groove 12 is butted up and down, The liquid port 1 is connected to the first cavity 3 , and the liquid outlet 2 is connected to the second cavity 4 . In this embodiment, the marking part can also be the anti-rotation surface 13 arranged on the circumference of the first cover body 8, the connecting body 7 and the second cover body 9. When the anti-rotation surfaces 13 are all on the same plane, the liquid inlet 1 and the The liquid outlet 2 is aligned with its corresponding cavity.

During specific implementation, first, by applying a positive pressure outside the liquid inlet 1, the cleaning liquid enters the first cavity 3 from the liquid inlet 1, and after the cleaning liquid entering the first cavity 3 is full, it flows from the first The communication channel 5 pours into the cleaning section 16 to clean the sampling needle in the cleaning section 16. Since the flow cross-sectional area of the liquid inlet 1 is smaller than the flow cross-sectional area of the first cavity 3, the liquid that enters from the liquid inlet 1 The flow rate of the cleaning liquid is fast. After the cleaning liquid enters the first cavity 3, the flow rate of the cleaning liquid is slowed down to control the flushing force of the cleaning liquid when cleaning the sampling needle, ensuring the cleaning strength of the sampling needle and avoiding the excessive flushing force of the sampling needle. And deformed.

Afterwards, the cleaned cleaning liquid goes out through the second communication channel 6 , the second cavity 4 and the liquid outlet 2 under the external negative pressure of the liquid outlet 2 . Since the flow cross-sectional area of the second cavity 4 is equal to the flow cross-sectional area of the liquid outlet 2, the cleaning liquid can be guaranteed to flow out smoothly.

Finally, the liquid inlet 1 stops entering liquid, and the outside of the liquid outlet 2 continues to provide negative pressure, and the external air passes through the liquid inlet 1, the first cavity 3, the first communication channel 5, the buffer section 15, the cleaning section 16, the second The two communication channels 6, the second cavity 4 and the liquid outlet 2 go out. The sampling needle moves up and down in the cleaning channel by external force, so that the liquid on the surface of the sampling needle is air-dried.

The cooperation between the first communication channel 5 and the first cavity 3 allows the cleaning liquid to enter the accommodation section 14 from two directions, and clean the sampling needle from two directions, which increases the cleanliness of the sampling needle. The cooperating arrangement of the communication channel 6 and the second cavity 4 makes the cross-sectional area of the entire flow channel of the sampling needle cleaning device larger, and eliminates the cleaning dead zone that exists when the flow channel of the sampling needle cleaning device is cleaned.

In order to further illustrate the use effect of the sampling needle cleaning device in this solution, this embodiment will be illustrated through experimental examples and comparative examples.

Experimental example 1

In this experimental example 1, the above-mentioned sampling needle cleaning device was used to clean the sampling needle, and then the residual blood cells were analyzed on the outer surface of the cleaned sampling needle by the five-classification blood cell analyzer. The specific operation steps were as follows:

1. Install the sampling needle cleaning device in this scheme on a five-category blood cell analyzer;

2. Evenly smear WBC (white blood cell) high-value quality control sample or RBC (red blood cell) high-value quality control sample on the outer wall of the sampling needle;

3. Place the sampling needle in the sampling needle cleaning device in this program for cleaning;

4. Move the cleaned sampling needle into the WBC reaction pool or the RBC reaction pool respectively, and immerse to a certain depth toward the outer wall; during specific operations, if the sampling needle is evenly coated with WBC high-value quality control, then enter the WBC reaction pool to measure the number of WBC particles ; If the outer wall of the sampling needle is uniformly smeared with RBC high-value quality control, first enter the WBC reaction pool, then draw the liquid in the WBC reaction pool into the RBC reaction pool, and measure the number of RBC particles and PLT (platelet) particles.

5. The liquid in the WBC reaction tank and the liquid in the RBC reaction tank were sampled and analyzed by five types of blood cell analyzers, and the same sample was used for five tests. The analysis results are shown in Table 1 to Table 3.

6. According to the "People's Republic of China Medical Industry Standard YYT 0653-2017", the number of particles is brought into the calculation to obtain the corresponding measured value. The specific measured values are shown in Table 1 to Table 3.

Comparative example 1

Use the same type of sampling needle cleaning device sold on the market to clean the sampling needle. The only difference between Comparative Example 1 and Experimental Example 1 is that the sampling needle cleaning device used is different, and the specific measured values are shown in Table 1 to Table 3.

Table 1 Analysis results of WBC measurement

Table 2 Analysis results of RBC measurement

Table 3 Analysis results of PLT measured value

Analysis of results:

It can be seen from Table 1 that the cleaning effect of the outer wall of the sampling needle after cleaning in Example 1 is good, which meets the requirement that the measured value of WBC in the evaluation standard "People's Republic of China Medical Industry Standard YYT 0653-2017" is lower than 0.10*10 ⁹ /L, and The WBC measured value is lower than the WBC measured value in Comparative Example 1.

It can be seen from Table 2 that the cleaning effect of the outer wall of the sampling needle after cleaning in Example 1 is good, which meets the requirement of the RBC measurement value of less than 0.02*10 ¹² /L in the evaluation standard "The People's Republic of China Medical Industry Standard YYT 0653-2017", and The RBC measured value is lower than the RBC measured value in Comparative Example 1.

It can be seen from Table 3 that the cleaning effect of the outer wall of the sampling needle after cleaning in Example 1 is good, which meets the requirement that the PLT measured value in the evaluation standard "People's Republic of China Medical Industry Standard YYT 0653-2017" is lower than 5*10 ⁹ /L, and The PLT measured value is lower than the PLT measured value in Comparative Example 1.

To sum up, it can be seen that after cleaning the sampling needles by the sampling needle cleaning device in this solution, the cleaning effect is higher than that of the same type of sampling needle cleaning devices currently on the market.

Experimental example 2

In Experimental Example 2, the same sampling needle cleaning device as Experimental Example 1 was used to clean the same sampling needle, and the specific operation steps are as follows:

1. Install the sampling needle cleaning device in this scheme on a five-category blood cell analyzer;

2. Place the sampling needle in the sampling needle cleaning device in this program for cleaning;

3. Move the cleaned sampling needle into the WBC pool, and immerse the outer wall of the sampling needle to a certain depth;

4. Draw up the liquid in the WBC pool and inject it into the RBC pool;

5. The liquid in the WBC pool and the liquid in the RBC pool were analyzed and tested by five types of blood cell analyzers. During the analysis and test, high-concentration samples were taken respectively and measured continuously for 3 times. The measured values were H1, H2, and H3 respectively; Concentration samples were measured continuously for 3 times, and the measured values were L1, L2, and L3 respectively. The results are shown in Table 4.

6. Calculate the carryover rate according to the formula.

Carryover rate = (L1-L3)/(H3-L3)×100%.

The calculation results are shown in Table 4.

The test result of table 4 experimental example 2

WBC measurement RBC measurement PLT measured value H1(10⁹/L) 243.28 7.25 275 H2(10⁹/L) 247.84 7.23 252 H3(10⁹/L) 249.36 7.09 263 L1(10⁹/L) 0.36 0 0 L2(10⁹/L) 0 0 0 L3(10⁹/L) 0 0 0 Pollution carry rate (%) 0.14 0 0

Analysis of Experimental Example 2 shows that:

1. Use the sampling needle cleaning device in this solution to clean the sampling needle, so that the WBC carryover rate is far lower than the requirement of 0.5% in the evaluation standard "People's Republic of China Medical Industry Standard YYT 0653-2017".

2. The sampling needle cleaning device in this solution is used to clean the sampling needle, so that the RBC contamination rate is far lower than the requirement of 0.5% in the evaluation standard "People's Republic of China Medical Industry Standard YYT 0653-2017".

3. The sampling needle cleaning device in this scheme is used to clean the sampling needle, so that the PLT carryover pollution rate is far lower than the requirement of PLT carryover pollution rate of less than 1.0% in the evaluation standard "People's Republic of China Medical Industry Standard YYT 0653-2017".

Regarding the above sampling needle cleaning device, this embodiment also discloses a sampling needle cleaning system, which includes a diluent storage tank, a liquid inlet pump, a sampling needle cleaning device, a filter, a waste liquid pump, and a waste liquid pool connected in sequence. The liquid inlet pump is connected with the liquid inlet 1 of the sampling needle cleaning device, and the filter is connected with the liquid outlet 2 of the sampling needle cleaning device. The liquid in the diluent storage pool enters the first cavity 3 and the cleaning section 16 through the operation of the liquid inlet pump, and then the cleaning liquid in the cleaning section 16 is discharged from the second cavity 4 and the liquid outlet 2 through the operation of the waste liquid pump. go out, and then enter the waste liquid pool after passing through the filter and the waste liquid pump.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (16)

1. The sampling needle cleaning device is characterized by comprising a body, wherein a cleaning channel for accommodating a sampling needle penetrates through the body in the axial direction; when the sampling needle is cleaned in the cleaning channel, the sampling needle is in clearance fit with the cleaning channel;

the body comprises a connecting body and cover bodies covering two ends of the connecting body, recessed parts are arranged at two ends of the connecting body, protruding parts which are respectively matched with the recessed parts are arranged on the cover bodies, the protruding parts extend into the recessed parts to be matched with the recessed parts to form cavities, the cavities are all arranged around the circumference of a cleaning channel, the range of the cavities arranged around the circumference of the cleaning channel is less than one circle, and the cavities are communicated with the cleaning channel;

the connector is also provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the corresponding cavities, and the liquid inlet and the liquid outlet have a height difference in the gravity direction.

2. The sampling needle cleaning device according to claim 1, wherein the cleaning passage has a circular cross-sectional area in an axial direction thereof.

3. The sampling needle cleaning device of claim 1, wherein the cavity is 1/2 ring-shaped, 1/4 ring-shaped, or 3/4 ring-shaped.

4. The sampling needle cleaning device according to any one of claims 1 to 3, wherein the body is further provided with a marking portion for aligning the liquid inlet and the liquid outlet with the corresponding cavities.

5. The sampling needle cleaning device according to claim 4, wherein communication channels are respectively opened between the cavity and the cleaning channel, the communication channels respectively communicate the cleaning channel with the corresponding cavity, and the communication channels are respectively opened on the side wall between the cavity and the cleaning channel.

6. The sampling needle cleaning device of claim 5, wherein the communication channel communicates with both ends of the same chamber and passes through the cleaning channel.

7. The sampling needle cleaning device according to claim 6, wherein the cavities are a first cavity and a second cavity, respectively, the first cavity is communicated with the liquid inlet, and the second cavity is communicated with the liquid outlet.

8. The sampling needle cleaning device according to claim 7, wherein the communicating passages are a first communicating passage and a second communicating passage respectively, the first communicating passage communicates the cleaning passage with the first cavity, the second communicating passage communicates the cleaning passage with the second cavity, and an opening position of the first communicating passage on the body is higher than a bottom surface of the first cavity.

9. The sampling needle cleaning device of claim 7, wherein the cross-sectional flow area of the first cavity is greater than the cross-sectional flow area of the liquid inlet.

10. The sampling needle cleaning device according to claim 7, wherein the flow cross-sectional area of the second cavity is equal to the flow cross-sectional area of the liquid outlet.

11. The sampling needle cleaning device according to claim 7, wherein the cover bodies are a first cover body and a second cover body respectively, the protrusion part on the first cover body extends into the connecting body to form the first cavity with the connecting body, and the protrusion part on the second cover body extends into the connecting body to form the second cavity with the connecting body.

12. The device for cleaning the sampling needle according to claim 11, wherein the marking portion is a groove formed on the circumference of the first cover body, the connecting body and the second cover body, the groove is parallel to the axis of the body, and when the grooves are butted up and down, the liquid inlet and the liquid outlet are aligned with the corresponding cavities.

13. The device for cleaning the sampling needle according to claim 11, wherein the identification portion is a rotation stop surface disposed on the circumference of the first cover body, the connecting body and the second cover body, and when the rotation stop surfaces are all in the same plane, the liquid inlet and the liquid outlet are aligned with the corresponding cavities.

14. The sampling needle cleaning device according to claim 11, wherein the cleaning channel includes a containing section, a buffering section, a cleaning section and a guiding section which are sequentially arranged on the body from bottom to top, the containing section is arranged on the first cover body, the buffering section is arranged on the connecting body, and the cleaning section and the guiding section are arranged on the second cover body.

15. The sampling needle cleaning device of claim 14, wherein the inner diameters of the guide section, the buffer section, the cleaning section, and the receiving section increase in order.

16. A sampling needle cleaning system comprising an inlet pump in communication with an inlet port, a waste pump in communication with an outlet port, and a sampling needle cleaning apparatus according to any one of claims 1 to 15.

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