Sampling needle cleaning method

Abstract

The invention provides a method for cleaning a sample adding needle. The method comprises the following steps: sequentially placing the sample adding needle into a first cleaning cavity (adaptive to the outer wall of a needle tube) and a second cleaning cavity (adaptive to the position of a needle head) which are communicated up and down on a cleaning base; cleaning liquid is injected into the two cavities respectively, flushing water flow is formed through the liquid level difference that the liquid inlet is higher than the liquid outlet, and the outer wall of the needle tube and the needle head are cleaned; starting a liquid suction function of the sampling needle in the second cleaning cavity, sucking cleaning liquid to soak the inner wall of the needle cylinder, and then discharging waste liquid; and finally, high-pressure airflow is conveyed to the first cleaning cavity to blow the outer wall of the needle tube for drying. According to the invention, accurate and efficient cleaning of different parts of the sampling needle is realized, the risk of cross contamination is obviously reduced, and the cleaning rate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cleaning a sample adding needle, and in particular to a method for cleaning a sample adding needle. Background Art

[0002] In modern medical testing and scientific research, pipette needles are key components of testing instruments, and their cleanliness directly impacts the accuracy and reliability of test results. Pipetting needles frequently collect different samples during operation, and to prevent cross-contamination between samples, they must be thoroughly cleaned after each collection.

[0003] Currently, most needle cleaning devices on the market use a single sink cleaning mode. This mode relies primarily on the flushing effect of water flow to remove impurities from the needle's surface. Although simple to operate, it has many drawbacks. Due to the limitations of the water flow's flushing force and angle, liquid is easily deposited on the outer wall of the needle after cleaning. To address this issue, many manufacturers choose to apply a hydrophobic coating to the outer wall of the needle. However, this undoubtedly significantly increases the production cost of the needle, and the durability and stability of the coating will also affect the service life of the needle. More importantly, the single sink cleaning mode has serious shortcomings in terms of cleaning range and effectiveness. Its cleaning process often only covers a portion of the outer wall of the needle tube, making it difficult to effectively clean the needle tip and the interior of the syringe, which are the most severely contaminated areas. The needle tip directly contacts the sample, and the possibility of residual impurities is high; the interior of the syringe is a key channel for sample transmission, and even small residues can cause cross-contamination. This cleaning method makes it difficult for the sample needle to reach the required cleanliness standard, which not only increases the risk of sample cross-contamination, but may also interfere with subsequent test data, causing deviations or even errors in experimental results, greatly affecting inspection efficiency and the credibility of scientific research conclusions. Summary of the Invention

[0004] The technical problem to be solved by the present application is that the existing single water tank mode cannot cover the cleaning of the needle and the inside of the syringe. In order to overcome the above defects of the existing technology, the present application provides a method for cleaning a sample needle.

[0005] The present application provides a method for cleaning a sample injection needle, comprising the following steps: Step a: Place the sample injection needle into the first cleaning cavity and the second cleaning cavity of the cleaning base from top to bottom, wherein the first cleaning cavity is located above the second cleaning cavity and is adapted to the outer wall of the needle tube, and the second cleaning cavity is adapted to the position of the needle tip; Step b: injecting cleaning liquid into the first cleaning chamber through the first cleaning part and discharging waste liquid, wherein the outlet end of the first liquid inlet joint of the first cleaning part is higher than the inlet end of the first liquid outlet joint; Step c: injecting cleaning liquid into the second cleaning chamber through the second cleaning part and discharging waste liquid, wherein the outlet end of the second liquid inlet joint of the second cleaning part is higher than the inlet end of the second liquid outlet joint; Step d: The sample injection needle starts the liquid aspiration function in the second cleaning chamber, aspirates the cleaning liquid to soak the inner wall of the syringe, and spits out the waste liquid after completion; Step e, the waste liquid is discharged through the waste liquid outlet at the bottom of the cleaning base; Step f: delivering high-pressure airflow to the first cleaning chamber through the air blowing connector, and the high-pressure airflow sweeps the outer wall of the needle tube, dries the residual liquid and removes impurities.

[0006] Compared with the prior art, the present invention provides a method for cleaning a sample needle, which has the following advantages: the first cleaning chamber is adapted to the outer wall of the needle tube, and the second cleaning chamber is adapted to the position of the needle, thereby achieving precise cleaning of different parts and solving the problem in the prior art that a single water sink cannot cover the needle tip and the inside of the syringe; the outlet end of the liquid inlet joint is higher than the inlet end of the liquid outlet joint, forming a water flow flushing path with a height difference, which effectively flushes impurities on the outer wall of the needle tube and the surface of the needle, removes impurities and avoids residue; the liquid absorption function of the sample needle allows the cleaning liquid to soak the inner wall of the syringe, thoroughly removing residual impurities inside the sample needle and reducing the risk of cross contamination; the high-pressure airflow purge not only dries the residual liquid, but also removes tiny impurities on the outer wall of the needle tube, thereby improving the cleanliness rate.

[0007] In one possible embodiment, the axis of the first liquid inlet connector is tilted at an acute angle to the direction in which the sample needle is inserted, while the axis of the first liquid outlet connector is parallel to the axis of the first liquid inlet connector. Compared to the prior art, the acutely tilted first liquid inlet connector allows water to strike the surface of the sample needle at a certain angle, forming an oblique flushing flow that covers a wider area of ​​the needle tube's outer wall and provides more thorough cleaning compared to vertical water flow. The first liquid outlet connector is parallel to the first liquid inlet connector, ensuring consistent water flow direction, avoiding cleaning blind spots caused by turbulent flow, and improving water flow utilization.

[0008] In one possible embodiment, the axis of the first liquid inlet connector forms an angle of 30-60 degrees with the insertion direction of the sample injection needle. Compared with the prior art, this 30-60 degree angle balances the impact of the water flow and the coverage area: too small an angle will result in insufficient water flow, while too large an angle will easily cause water splashing. This angle range maximizes the removal of impurities from the outer wall of the needle tube while reducing liquid loss.

[0009] In one possible embodiment, the inlet of the first liquid inlet connector is connected to a first injection pump, and the outlet of the first liquid outlet connector is connected to the first liquid outlet pump; the inlet of the second liquid inlet connector is connected to a second injection pump, and the outlet of the second liquid outlet connector is connected to a second liquid outlet pump. Compared with existing technologies, the injection pump can adjust the injection volume and pressure of the cleaning liquid to accommodate needles with different levels of contamination; the liquid outlet pump ensures the timely discharge of waste liquid, maintains a stable liquid level in the cleaning chamber, and avoids the impact of liquid level fluctuations on the cleaning effect; through the linkage control of the pumps, the cleaning liquid injection and discharge process is automated, reducing manual intervention, improving cleaning efficiency, and ensuring parameter consistency throughout each cleaning.

[0010] In one possible embodiment, the sample needle is externally connected to a negative pressure pump. Compared to existing technologies, this provides stable suction, enabling the sample needle to more efficiently absorb cleaning fluid, ensuring that the inner wall of the syringe is fully immersed and completely removing residual sample, thus resolving the problem of insufficient inner wall cleaning in existing technologies. The negative pressure pump can also adjust the aspiration speed and immersion time, allowing for personalized cleaning of syringes with different levels of contamination, improving the adaptability of cleaning solutions.

[0011] In one possible embodiment, the outlet of the air blow connector is connected to the first cleaning chamber, and the inlet of the air blow connector is connected to an external air pump. Compared to existing technologies, the air blow connector connected to the external air pump provides a continuous high-pressure airflow. Compared to traditional natural air drying or low-pressure airflow, it can dry the outer wall liquid more quickly and remove stubborn impurities through the impact of the airflow, thereby improving cleaning efficiency and cleanliness.

[0012] In one possible embodiment, a blower seat is fixedly mounted at the top of the first cleaning chamber. The blower seat has an inner hole and multiple air holes connected to the inner hole. The inner hole is used to allow the sample needle to pass through and enter the first cleaning chamber. The multiple air holes are evenly spaced around the inner hole and connected to the air outlet of the blower connector. Compared with the existing technology, the inner hole of the blower seat is used to allow the sample needle to pass through, and the circumferentially evenly distributed air holes are connected to the blower connector. This allows high-pressure airflow to be sprayed in a circular shape onto the outer wall of the needle tube, achieving a 360-degree clean sweep without blind spots, avoiding localized residual liquid or impurities. The uniformity of the airflow improves drying efficiency.

[0013] In one possible embodiment, the axis of the air hole is inclined at an acute angle to the insertion direction of the sample needle. Compared to the prior art, this acutely inclined air hole allows airflow to sweep tangentially along the needle tube surface, enhancing the airflow's effect on the needle tube's outer wall, which not only speeds up drying but also helps remove residual impurities.

[0014] In one possible embodiment, a fixing plate and a seal are installed on the top of the cleaning base. The fixing plate, through the seal, presses and seals the air blowing seat against the cleaning base. Compared to existing technologies, the seal prevents air leakage, ensures stable air blowing pressure, and improves drying efficiency. It also prevents cleaning liquid from seeping into the air blowing system, preventing equipment damage. The fixing plate secures the air blowing seat, preventing component loosening due to vibration during long-term use and ensuring device stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the device structure of this application Figure 1 ; Figure 2 This is a schematic diagram of the device structure of this application Figure 2 ; Figure 3 The device used in this application is a state diagram; Figure 4 for Figure 3 A magnified view of point A; Description of reference numerals: 1. Cleaning base; 11. First cleaning chamber; 12. Second cleaning chamber; 13. Waste liquid outlet; 2. First cleaning section; 21. First liquid inlet connector; 22. First liquid outlet connector; 23. First injection pump; 24. First liquid outlet pump; 3. Second cleaning section; 31. Second liquid inlet connector; 32. Second liquid outlet connector; 33. Second injection pump; 34. Second liquid outlet pump; 4. Air blowing connector; 41. Air pump; 5. Air blowing seat; 51. Inner hole; 52. Air hole; 6. Fixing plate; 7. Seal; 8. Mounting plate; 9. Sample adding needle; 10. Negative pressure pump. DETAILED DESCRIPTION

[0016] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0017] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0018] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0019] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See also Figures 1 to 4 , the embodiment of the present application discloses a sample needle cleaning device, comprising: a cleaning base 1, a first cleaning part 2, a second cleaning part 3, and a waste liquid discharge port 13; the cleaning base 1 is provided with a first cleaning chamber 11 and a second cleaning chamber 12 arranged vertically, the first cleaning chamber 11 and the second cleaning chamber 12 are connected to each other for the sample needle 9 to be placed therein, the first cleaning chamber 11 is located above the second cleaning chamber 12 and is adapted to the outer wall of the needle tube of the sample needle 9, and the second cleaning chamber 12 is adapted to the needle position of the sample needle 9; the first cleaning part 2 includes a first liquid inlet connector 21 and a first liquid outlet connector 22 connected to the first cleaning chamber 11, and the outlet end height of the first liquid inlet connector 21 is higher than The inlet end height of the first liquid outlet joint 22, the inlet end of the first liquid inlet joint 21 is connected to the first liquid injection pump 23, and the outlet end of the first liquid outlet joint 22 is connected to the first liquid outlet pump 24; the second cleaning part 3 includes a second liquid inlet joint 31 and a second liquid outlet joint 32 connected to the second cleaning chamber 12, the outlet end height of the second liquid inlet joint 31 is higher than the inlet end height of the second liquid outlet joint 32, the inlet end of the second liquid inlet joint 31 is connected to the second liquid injection pump 33, and the outlet end of the second liquid outlet joint 32 is connected to the second liquid outlet pump 34; the waste liquid discharge port 13 is set at the bottom of the cleaning base 1, and the waste liquid discharge port 13 is connected to the second cleaning chamber 12.

[0021] Among them, the cleaning base 1 can be integrally formed of high-strength, corrosion-resistant engineering plastics or metal materials to ensure its structural strength and service life; the first cleaning chamber 11 and the second cleaning chamber 12 are formed by opening vertical channels inside the cleaning base 1, and the diameter of the first cleaning chamber 11 is slightly larger than the diameter of the tube body of the sampling needle 9 so that the sampling needle 9 can be smoothly inserted; the diameter of the second cleaning chamber 12 is adapted to the needle part of the sampling needle 9, and can accurately accommodate the needle to achieve targeted cleaning; the first cleaning chamber 11 and the second cleaning chamber 12 are connected by a transition channel to ensure that the cleaning liquid flows from top to bottom. In the first cleaning section 2, the first liquid inlet connector 21 and the first liquid outlet connector 22 are made of acid- and alkali-resistant pipes and are fixed to the cleaning base 1 by threaded connection or welding. The outlet end height of the first liquid inlet connector 21 is higher than the inlet end height of the first liquid outlet connector 22, forming a certain liquid level difference, which facilitates the natural flow of cleaning liquid in the first cleaning chamber 11. The first liquid injection pump 23 is a high-precision peristaltic pump that can accurately control the injection volume and injection speed of cleaning liquid. The first liquid outlet pump 24 is a self-priming centrifugal pump that can quickly pump out waste liquid from the first cleaning chamber 11. The second liquid inlet connector 31 and the second liquid outlet connector 32 of the second cleaning section 3 are installed in a similar manner to the first cleaning section 2, also ensuring that the outlet end height of the second liquid inlet connector 31 is higher than the inlet end height of the second liquid outlet connector 32. The second liquid injection pump 33 and the second liquid outlet pump 34 are selected from the same type of pump as the first cleaning section 2, and are used to inject cleaning liquid into the second cleaning chamber 12 and discharge waste liquid, respectively. The waste liquid outlet 13 is arranged at the lowest position of the bottom of the cleaning base 1 and is connected to an external waste liquid collection container through a pipeline to ensure that the waste liquid in the cleaning chamber can be discharged smoothly by gravity.

[0022] In this embodiment, the axial direction of the first liquid inlet connector 21 is tilted at an acute angle to the insertion direction of the sample needle 9, and the axial direction of the first liquid outlet connector 22 is parallel to the axial direction of the first liquid inlet connector 21. In order to achieve a better cleaning effect, the axial direction of the first liquid inlet connector 21 forms an angle of 30-60 degrees with the insertion direction of the sample needle 9. Specifically, when the first liquid inlet connector 21 is installed, its axial direction is tilted at an acute angle to the insertion direction of the sample needle 9, which can be achieved by providing an inclined mounting hole on the cleaning base 1. The axial direction of the first liquid outlet connector 22 is parallel to the axial direction of the first liquid inlet connector 21, and is also fixed by providing a corresponding inclined mounting hole on the cleaning base 1. This arrangement allows the cleaning liquid injected by the first liquid inlet connector 21 to impact the surface of the sample needle 9 at a certain angle, forming a more effective flushing effect. At the same time, the first liquid outlet connector 22 can smoothly discharge the waste liquid, avoiding the formation of vortexes in the first cleaning chamber 11, thereby improving the cleaning efficiency.

[0023] In this embodiment, the device also includes an air blowing connector 4 installed on the cleaning base 1. The air outlet of the air blowing connector 4 is connected to the first cleaning chamber 11, and the air inlet of the air blowing connector 4 is connected to the external air pump 41. Specifically, the air blowing connector 4 adopts a quick plug-in connector, which is convenient for connection and disassembly with the external air pump 41; the air outlet of the air blowing connector 4 is connected to the first cleaning chamber 11, and the connection method can adopt a ferrule connection to ensure the sealing of the connection; the external air pump 41 uses a small high-pressure air pump 41, which can provide a stable high-pressure airflow; after the sample needle 9 is cleaned, the external air pump 41 is started, and the high-pressure airflow enters the first cleaning chamber 11 through the air blowing connector 4, blowing and drying the surface of the sample needle 9, effectively removing the cleaning liquid remaining on the surface of the sample needle 9, and preventing water stains from affecting subsequent sample addition operations. When it is necessary to clean the airway in the device, the air inlet of the air blowing connector 4 can be connected to the external cleaning pump for easy cleaning.

[0024] In this embodiment, a blowing seat 5 is fixedly provided on the top of the first cleaning chamber 11. The blowing seat 5 has an inner hole 51 and a plurality of air holes 52 connected to the inner hole 51. The inner hole 51 is used for the sample injection needle 9 to pass through and enter the first cleaning chamber 11. The plurality of air holes 52 are evenly spaced around the circumference of the inner hole 51 and are connected to the air outlet end of the blowing connector 4; the axial direction of the air hole 52 is inclined at an acute angle to the insertion direction of the sample injection needle 9. For example, the angle between the axis of the air hole 52 and the insertion direction of the sample injection needle 9 can be set between 30-60 degrees to achieve the best drying effect. Specifically, the blowing seat 5 is injection-molded with a high-temperature-resistant and wear-resistant plastic material, and an inner hole 51 adapted to the sampling needle 9 is provided in the center. The size of the inner hole 51 is slightly larger than the diameter of the sampling needle 9 to ensure that the sampling needle 9 can pass through smoothly; multiple air holes 52 are evenly spaced around the circumference of the inner hole 51, for example, 4-6 air holes 52 can be set, and the diameter of the air holes 52 is 1-2 mm; each air hole 52 is connected to the air outlet end of the blowing connector 4 through an internal channel; the sampling needle 9 is inserted into the inner hole 51, and high-pressure airflow is ejected from the air hole 52, evenly acting on the surface of the sampling needle 9, realizing all-round blowing drying.

[0025] In this embodiment, a fixing plate 6 and a sealing member 7 are provided on the top of the cleaning base 1. The fixing plate 6 compresses and seals the air blowing seat 5 against the cleaning base 1 via the sealing member 7. Specifically, a mounting groove is pre-machined on the top of the cleaning base 1 for accommodating the air blowing seat 5. The sealing member 7 is an oil-resistant, acid-resistant, and alkali-resistant rubber sealing ring and is placed between the air blowing seat 5 and the cleaning base 1. The fixing plate 6 is fixed to the cleaning base 1 via bolts. During installation, the bolts are tightened so that the fixing plate 6 compresses and seals the air blowing seat 5 against the cleaning base 1 via the sealing member 7, ensuring the sealing of the first cleaning chamber 11, preventing leakage of the high-pressure airflow, and ensuring the effectiveness of the air-drying process.

[0026] In this embodiment, a mounting plate 8 is provided on the cleaning base 1 to secure the entire device. Specifically, the mounting plate 8 is made of metal and is bolted to the bottom of the cleaning base 1. The mounting plate 8 has multiple mounting holes, the size and location of which are compatible with the mounting brackets of laboratory equipment or instruments. During actual installation, bolts or screws are used to connect the mounting plate 8 to the equipment bracket, thereby firmly fixing the entire cleaning device in the designated position and ensuring that the device remains stable during operation and prevents displacement or loosening due to factors such as vibration.

[0027] This embodiment also provides a method for cleaning a sample injection needle, comprising the following steps: Step a: Place the sample injection needle 9 into the first cleaning chamber 11 and the second cleaning chamber 12 of the cleaning base 1 from top to bottom; Step b, injecting cleaning liquid into the first cleaning chamber 11 through the first cleaning unit 2 and discharging waste liquid, that is, the first liquid injection pump 23 injects cleaning liquid into the first cleaning chamber 11 through the first liquid inlet connector 21, the outlet end of the liquid inlet connector is higher than the inlet end of the liquid outlet connector, forming a drop flow to flush the outer wall of the needle tube, and the first liquid outlet pump 24 discharges the waste liquid through the first liquid outlet connector 22; Step c, injecting cleaning liquid into the second cleaning chamber 12 through the second cleaning unit 3 and discharging waste liquid, that is, the second liquid injection pump 33 injects cleaning liquid into the second cleaning chamber through the second liquid inlet connector 31, and the outlet end of the liquid inlet connector is higher than the inlet end of the liquid outlet connector, forming a drop flow to flush the outer wall of the needle, and the second liquid outlet pump 34 discharges the waste liquid through the second liquid outlet connector 32; Step d: The sample injection needle 9 starts to absorb liquid in the second cleaning chamber 12 through the negative pressure pump 10, absorbs the cleaning liquid to soak the inner wall of the syringe, and spits out the waste liquid after completion; Step e: the waste liquid is discharged through the waste liquid outlet 13 at the bottom of the cleaning base 1; Step f: deliver high-pressure airflow to the first cleaning chamber 11 through the air blowing connector 4. The high-pressure airflow is ejected at an acute angle through the air holes 52 evenly distributed around the air blowing seat 5, sweeping the needle tube circumferentially, drying the residual liquid and blowing away impurities.

[0028] Among the beneficial effects are: 1. Precise zoned cleaning: Through the upper and lower connected first cleaning chamber 11 (adapted to the outer wall of the needle tube) and the second cleaning chamber 12 (adapted to the position of the needle), the needle tube and the most seriously contaminated needle tip can be cleaned in a zoned and targeted manner, which completely solves the defect that the single sink mode cannot cover the needle and the inside of the syringe, and significantly improves the comprehensiveness of cleaning.

[0029] 2. Efficient flushing and decontamination: The outlet end of the liquid inlet connector is higher than the inlet end of the liquid outlet connector, forming a water flow path with a liquid level drop, thereby enhancing the flushing force; combined with the design of the first liquid inlet connector 21 and the sample needle 9 being tilted at an acute angle, the water flow obliquely impacts the needle wall, expanding the coverage range and avoiding vertical flushing dead corners, effectively removing residual impurities and reducing the risk of cross contamination.

[0030] 3. Independently Controlled Cleaning Process: Both cleaning units are equipped with independent infusion and discharge pumps, enabling precise control of flow rate, flow velocity, and cleaning time to adapt to varying levels of contamination, improving cleaning efficiency and targeting. The needle actively absorbs liquid in the second cleaning chamber 12, achieving immersion cleaning of the inner wall.

[0031] 4. Residue-free drying: The air blowing connector 4 cooperates with the circumferentially evenly distributed and acutely inclined air holes 52 to form an annular airflow, which blows along the tangential direction of the needle tube surface, quickly drying the residual liquid and removing particles, preventing sample dilution or secondary contamination, and ensuring the accuracy of subsequent sample additions.

[0032] 5. Stable sealing and compatibility: The seal 7 and the fixing plate 6 ensure the sealing and long-term stability of the blowing system; the mounting plate 8 provides a standardized interface for easy integration into various biochemical testing equipment, improving compatibility and operational reliability.

[0033] 6. By using the injection pump, the pump can be connected to the external cleaning liquid pipeline, so that the cleaning liquid is always a flowing liquid, avoiding the use of cleaning bottles and preventing the increase in the workload of taking cleaning bottles; eliminating the use of cleaning bottles and reducing the space occupied by the reagent warehouse.

[0034] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0035] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0036] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for cleaning a sample needle, characterized in that: The following steps are involved: Step a: Place the sample injection needle into the first cleaning cavity and the second cleaning cavity of the cleaning base from top to bottom, wherein the first cleaning cavity is located above the second cleaning cavity and is adapted to the outer wall of the needle tube, and the second cleaning cavity is adapted to the position of the needle tip; Step b: injecting cleaning liquid into the first cleaning chamber through the first cleaning part and discharging waste liquid, wherein the outlet end of the first liquid inlet joint of the first cleaning part is higher than the inlet end of the first liquid outlet joint; Step c: injecting cleaning liquid into the second cleaning chamber through the second cleaning part and discharging waste liquid, wherein the outlet end of the second liquid inlet joint of the second cleaning part is higher than the inlet end of the second liquid outlet joint; Step d: The sample injection needle starts the liquid aspiration function in the second cleaning chamber, aspirates the cleaning liquid to soak the inner wall of the syringe, and spits out the waste liquid after completion; Step e, the waste liquid is discharged through the waste liquid outlet at the bottom of the cleaning base; Step f: delivering high-pressure airflow to the first cleaning chamber through the air blowing connector, and the high-pressure airflow sweeps the outer wall of the needle tube, dries the residual liquid and removes impurities.

2. The method for cleaning a sample injection needle according to claim 1, wherein: The axial direction of the first liquid inlet connector is tilted at an acute angle to the insertion direction of the sample needle, and the axial direction of the first liquid outlet connector is parallel to the axial direction of the first liquid inlet connector.

3. The method for cleaning a sample injection needle according to claim 2, wherein: The angle formed between the axis direction of the first liquid inlet connector and the insertion direction of the sample injection needle is 30-60 degrees.

4. The method for cleaning a sample injection needle according to claim 1, wherein: The inlet end of the first liquid inlet joint is connected to a first liquid injection pump, and the outlet end of the first liquid outlet joint is connected to the first liquid outlet pump; the inlet end of the second liquid inlet joint is connected to a second liquid injection pump, and the outlet end of the second liquid outlet joint is connected to a second liquid outlet pump.

5. The method for cleaning a sample injection needle according to claim 1, wherein: The sample adding needle is externally connected to a negative pressure pump.

6. The method for cleaning a sample injection needle according to claim 1, wherein: The air outlet end of the air blowing joint is connected to the first cleaning chamber, and the air inlet end of the air blowing joint is connected to an external air pump.

7. The method for cleaning a sample injection needle according to claim 6, wherein: A blowing seat is fixedly provided on the top of the first cleaning chamber. The blowing seat has an inner hole and multiple air holes connected to the inner hole. The inner hole is used for the sampling needle to pass through and enter the first cleaning chamber. The multiple air holes are evenly spaced around the circumference of the inner hole and are connected to the air outlet end of the blowing joint.

8. The method for cleaning a sample injection needle according to claim 7, wherein: The axis direction of the air hole is inclined at an acute angle to the insertion direction of the sample adding needle.

9. The method for cleaning a sample injection needle according to claim 7, wherein: A fixing plate and a sealing member are provided on the top of the cleaning base, and the fixing plate presses and seals the blowing seat onto the cleaning base through the sealing member.

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