A dual-needle sample dispensing needle cleaning device, sample analyzer and method

Abstract

This invention relates to a cleaning device, sample analyzer, and method for a dual-needle structure. The cleaning device includes a cleaning tank, a partition, a liquid outlet, and a drain outlet. The partition is positioned on one side of the cleaning tank, corresponding to the area between the two sampling needles. The liquid outlet is located on the other side of the cleaning tank and is used to spray cleaning fluid onto the outer walls of the two sampling needles. The drain outlet is located at the bottom of the cleaning tank to discharge the cleaning fluid after cleaning the sampling needles. The cleaning device provided by this invention can effectively remove residual liquid between the two needles, while also reducing the amount of liquid adhering to the outer walls of the needles or the risk of liquid adhering to the outer walls, effectively preventing the risk of dilution of the test sample. The cleaning method provided by this invention allows for setting cleaning modes according to different levels of contamination in the test items, effectively improving the cleaning effect and saving water to a certain extent. The cleaning device and method provided by this invention, when applied to a sample analyzer, can effectively improve the quality of the analyzer and the user experience.

Description

Technical Field

[0001] This invention relates to the field of in vitro diagnostic medical technology, and in particular to a dual-needle sample dispensing needle cleaning device, sample analyzer, and method. Background Technology

[0002] In modern medical testing and scientific research, sample dispensing needles are a crucial component of sample analysis equipment, and their cleanliness directly affects the accuracy and reliability of test results. During operation, sample dispensing needles frequently collect different samples, and to prevent cross-contamination, they must be thoroughly cleaned after each collection. Currently, most sample dispensing needle cleaning devices on the market use a water tank cleaning method. This method relies primarily on the flushing action of water to remove impurities from the needle surface. While simple to operate, it has several drawbacks. Due to the limitations of water flow force and angle, liquid tends to adhere to the outer wall of the sample dispensing needle after cleaning, especially for needles with a dual-needle structure. Because of the gap between the two needles, liquid tends to accumulate between them after cleaning, resulting in a much larger residual amount compared to single-needle structures. Even if the distance between the two needles is increased, the arc or conical shape of the sample container's bottom will cause the distance to gradually decrease over time, eventually leading to liquid adhesion. This not only dilutes the sample and increases the risk of cross-contamination but may also interfere with subsequent testing data, causing deviations or even errors in experimental results, significantly impacting the accuracy and reliability of the sample analyzer's results. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sample needle cleaning device, sample analyzer and method with a dual-needle structure, which aims to improve the cleaning effect of the sample needle, reduce the risk of liquid adhering to the outer wall of the needle, and solve the problem of inevitable liquid adhering between the dual-needle structures, so as to improve the accuracy and reliability of the test results of the sample analyzer.

[0004] The first objective of this invention is to provide a cleaning device for a dual-needle structure, comprising a cleaning tank, a partition, a liquid outlet, and a liquid drain. The partition is disposed on one side of the cleaning tank and at a position corresponding to the space between the two sampling needles. The liquid outlet is disposed on the other side of the cleaning tank and is used to spray cleaning fluid onto the outer walls of the two sampling needles. The liquid drain is disposed at the bottom of the cleaning tank to discharge the cleaning fluid after cleaning the sampling needles.

[0005] In some possible implementations, the outlet includes an inlet and an outlet that are interconnected; the inlet is a straight end and connected to an external liquid supply device, and the outlet is a beveled end for spraying cleaning fluid toward the outer wall of the sample needle.

[0006] In some possible implementations, the drain outlet is provided with a cleaning cup sleeve.

[0007] The second objective of this invention is to provide a sample analyzer, including the sample dispensing needle cleaning device with the above-mentioned dual-needle structure.

[0008] In some possible implementations, the sample analyzer further includes:

[0009] A sample dispensing device includes two dispensing needles, a needle driving mechanism, and a sample aspiration driving component; the dispensing needles are used for sample or reagent sampling; the needle driving mechanism supports the dispensing needles and drives the dispensing needles to move; the sample aspiration driving component is connected to the dispensing needles to quantitatively aspirate the sample to be tested through the dispensing needles.

[0010] A liquid supply device is provided, which connects the inside of the sample needle and the liquid outlet through the inner wall cleaning passage and the outer wall cleaning passage, respectively, thereby providing cleaning solution for cleaning the inner and outer walls of the sample needle.

[0011] The control device is electrically connected to the needle drive mechanism, the sample aspiration drive component, and the liquid supply device. The control device controls the needle drive mechanism to move the sample aspiration needle into the cleaning tank, controls the liquid supply device to inject cleaning liquid into the sample aspiration needle and the cleaning tank, controls the needle drive mechanism to drive the sample aspiration needle up and down, and controls the sample aspiration drive component to aspirate the sample to be tested.

[0012] In some possible implementations, the liquid supply device includes a solenoid valve and a liquid pump; the solenoid valve and the liquid pump for pumping the cleaning liquid are provided on both the inner wall cleaning passage and the outer wall cleaning passage of the needle, and the control device is electrically connected to the solenoid valve.

[0013] In some possible implementations, the control device includes a processing unit, a storage unit, a communication interface, and an I / O interface; the processing unit, the storage unit, the communication interface, and the I / O interface are connected and communicate via a bus; the storage unit contains various computer programs for the processing unit to execute and the data required to execute the computer programs.

[0014] Thirdly, this invention provides a method for cleaning a dual-needle sample dispensing needle for use in the aforementioned sample analyzer, the method comprising:

[0015] The control device can automatically set and run the cleaning mode according to the detection items, and the control device can automatically strengthen the cleaning of the sample needle according to the preset number of detection items or time.

[0016] The control device can control the needle drive mechanism to move the sample dispensing needle into the cleaning tank, and the control device can control the needle drive mechanism to make the sample dispensing needle move up and down relative to the cleaning tank;

[0017] The control device can control the liquid supply device to inject cleaning liquid into the sample needle and the cleaning tank.

[0018] The beneficial effects of this invention are:

[0019] 1. The cleaning device provided by the present invention is equipped with a needle spacer, which can effectively remove residual liquid between the two needles, while also reducing the amount of liquid adhering to the outer wall of the needle or the risk of liquid adhering, effectively preventing the risk of dilution of the sample to be tested, and improving the accuracy and stability of the instrument detection results.

[0020] 2. The cleaning method provided by this invention can set the cleaning mode according to the detection items with different levels of pollution, which can effectively improve the cleaning effect, reduce the rate of contamination, and save water to a certain extent.

[0021] 3. The cleaning device and method provided by this invention can be applied to sample analyzers to effectively improve the quality of the analyzer and the user experience. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cleaning device.

[0023] Figure 2 for Figure 1 A sectional view;

[0024] Figure 3 This is a schematic diagram showing the sampling needle inside the cleaning device.

[0025] Figure 4 This is a schematic block diagram of a sample analyzer;

[0026] Figure 5 This is a schematic diagram illustrating the cleaning principle of the sampling needle (arrows indicate the direction of the cleaning solution flow).

[0027] Figure 6 This is a schematic diagram showing the flow direction of the cleaning fluid inside the cleaning device (arrows indicate the flow direction of the cleaning fluid).

[0028] Figure 7 This is a schematic diagram illustrating the cleaning and dispensing procedure after sampling for routine projects.

[0029] Figure 8 A schematic diagram illustrating the sampling needle action after sampling and regular enhanced cleaning of a heavily polluting project.

[0030] Figure 9 A schematic diagram of the needle cleaning procedure for special items (such as glycated hemoglobin);

[0031] Figure 10 This is a schematic diagram showing the descent depth of the sampling needle during the cleaning process.

[0032] Figure 11 Flowchart for the cleaning control of the inner wall of the sample dispensing needle;

[0033] Figure 12 This is a flowchart for the cleaning control of the outer wall of the sample dispensing needle.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Cleaning tank; 2. Partition; 3. Liquid outlet; 4. Liquid drain; 5. Sampling needle; 6. Cleaning cup sleeve; 7. Needle drive mechanism; 8. Sampling drive component; 9. Needle inner wall cleaning passage; 10. Needle outer wall cleaning passage; 11. Solenoid valve; 12. Liquid pump; 13. Needle movement channel. Detailed Implementation

[0036] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0037] like Figure 1-3 As shown, the present invention firstly discloses a cleaning device for a dual-needle structure, comprising a cleaning tank 1, a partition 2, a liquid outlet 3, and a drain outlet 4. The partition 2 is disposed on one side of the cleaning tank 1, corresponding to the position between two sampling needles 5, and is used to remove liquid adhering between the two needles and reduce the risk of liquid adhering to the outer wall of the needles. The liquid outlet 3 is disposed on the other side of the cleaning tank 1 and is used to spray cleaning fluid onto the outer wall of the two sampling needles 5. The drain outlet 4 is disposed at the bottom of the cleaning tank 1 to discharge the cleaning fluid after cleaning the sampling needles 5. The drain outlet 4 is located vertically directly below the cleaning tank 1, and the outer wall of the sampling needles 5 can be cleaned simultaneously with the discharge of waste fluid through the drain outlet 4. A cleaning cup sleeve 6 is provided inside the drain outlet 4. The outlet of the cleaning cup sleeve 6 is small, which has a flow-blocking effect. Therefore, the cleaning cup sleeve 6 can slow down the discharge rate of the cleaning fluid in the cleaning tank 1, effectively prolonging the time that the outer wall of the saccharified sampling needle 5 is immersed in the cleaning fluid, thus improving the cleaning effect of the sampling needle 5.

[0038] The outlet 3 includes an inlet and an outlet that are interconnected. The inlet is a straight section and is connected to an external liquid supply device, while the outlet is an angled section used to spray cleaning fluid onto the outer wall of the sampling needle 5. The straight-in, angled-out design of the outlet 3 provides a buffering effect, preventing splashing risks caused by unstable pressure in the liquid system during the initial filling.

[0039] The present invention also provides a sample analyzer, including the above-mentioned dual-needle structure sample dispensing needle cleaning device, and further including a sample dispensing device, a stirring device, a sample storage device, a reagent storage device, a reaction device, a detection device, a cleaning device, a liquid supply device, and a control device.

[0040] The sample dispensing device is used to quantitatively draw the sample into the sample container containing the sample to be tested and deliver it to the reaction vessel of the reaction apparatus.

[0041] The stirring device is used to mix the reagents and samples in the reaction vessel to ensure a complete reaction and form a qualified test sample solution.

[0042] Sample storage devices are used to provide samples to be tested, including but not limited to blood samples.

[0043] The reagent storage device is used to provide reagents for the reaction with the sample to be tested.

[0044] The reaction apparatus is used to receive the sample to be tested and the reagent, so as to mix the sample to be tested with the reagent to form the sample solution.

[0045] The detection device is used to detect the sample liquid to be tested and obtain corresponding detection data. The detection device also includes an optical detection unit, which is used to detect the sample liquid to obtain corresponding data. The optical detection unit is equipped with a light source and a detection area. The sample liquid to be tested is illuminated in the detection area by the light source. By monitoring the rate of change of transmitted or scattered light signals and using a predetermined calculation method, the content of the target substance in the sample liquid to be tested is detected, and the corresponding detection data is obtained.

[0046] The cleaning device provides a cleaning position for the cleaning of the sample dispensing device, and the liquid supply device provides cleaning solution for the cleaning of the sample dispensing device.

[0047] The control device controls the sample dispensing device, stirring device, sample storage device, reagent storage device, reaction device, detection device, and liquid supply device to work together through a communication interface or I / O interface to complete the detection of the sample to be tested.

[0048] like Figure 4As shown, the control unit of the sample analyzer includes at least a processing unit, a storage unit, a communication interface, and an I / O interface. The processing unit, storage unit, communication interface, and I / O interface are connected and communicate via a bus. The processing unit executes various computer programs, including but not limited to a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), other general-purpose processors, or other programmable logic devices, transistor logic devices, etc. The storage unit contains the operating system, application programs, and other computer programs executed by the processing unit, as well as the data required to execute these programs. Data that needs to be stored locally during the sample detection and analysis process or the cleaning of the sample needle can be stored in the storage unit. The communication interface can be any known communication protocol. The control unit can communicate over a network using a preset communication protocol through the communication interface, transmitting instructions or data with any device connected through the network. The I / O interface can be a serial interface such as USB or RS-232, or a parallel interface such as Centronics, SCSI, or IDE, as well as an analog signal interface. Furthermore, the I / O interface is connected to an input device, allowing users to directly input data into the control device. This input device includes, but is not limited to, a keyboard, mouse, and touchscreen. The display device connects to the control device via the I / O interface to display or prompt relevant information.

[0049] like Figure 5 , 6As shown, the cleaning device includes a cleaning tank 1, a needle spacer 2, a liquid outlet 3, a liquid drain 4, and a cleaning cup sleeve 6. The cleaning device can realize the entry and exit of the sampling needle 5 and the cleaning of the outer wall of the needle. The cleaning tank 1 is equipped with a needle spacer 2, a liquid outlet 3, and a liquid drain 4. The cleaning fluid ejected from the liquid outlet 3 is used to clean the outer wall of the sampling needle 5. The liquid supply device is connected to the liquid outlet 3 of the cleaning tank 1 through a pipeline. When cleaning the outer wall of the sampling needle 5, the needle drive mechanism 7 moves the sampling needle 5 into the cleaning tank 1 of the cleaning pool. The control device controls the solenoid valve 11 located on the needle outer wall cleaning passage 10 of the liquid supply device to open, and controls the liquid pump 12 on the needle outer wall cleaning passage 10 of the liquid supply device to deliver cleaning fluid to the liquid outlet 3 of the cleaning tank 1 through the pipeline for cleaning the outer wall of the sampling needle 5. Between the outlet 3 and the drain 4 of the cleaning tank 1, a needle spacer 2 is positioned in the center of the cleaning tank 1. The needle spacer 2 divides the interior of the cleaning tank 1 into a needle movement channel 13 for the two sampling needles 5 to move up and down. When the sampling needles 5 have finished cleaning, the outlet 3 stops dispensing cleaning fluid, and the control device controls the needle drive mechanism 7 to drive the sampling needles 5 upward at a preset speed. If there is residual cleaning fluid on the outer wall or between the needles of the sampling needles 5, the needle spacer 2 will scrape off the residual cleaning fluid. In addition, the surface of the needle spacer 2 is designed to have a friction coefficient slightly greater than that of the outer wall of the sampling needles 5. That is, the tension between the surface of the spacer 2 and the liquid is greater than that between the outer wall of the sampling needles 5 and the liquid, so that the spacer 2 can carry away the residual cleaning fluid on the outer wall of the sampling needles 5, which can greatly reduce the risk of liquid adhering to the outer wall of the sampling needles 5. The bottom of the cleaning tank 1 is equipped with a drain port 4. Waste liquid generated during the cleaning process of the sample needle 5 can be discharged by gravity through the drain port 4, eliminating the need for additional pumps and valves. This design is simple and inexpensive. The cleaning cup sleeve 6 is located at the waste liquid discharge end of the cleaning tank and is connected to the drain port 4. It is used to slow down the discharge rate of the cleaning liquid. The cleaning cup sleeve 6 improves the structural compatibility of the cleaning tank 1. For sample analyzers that do not require soaking and cleaning, the same cleaning tank 1 can be used; only the cleaning cup sleeve 6 needs to be removed.

[0050] like Figure 5As shown, the sampling device includes a sampling needle 5, a needle driving mechanism 7, and a suction driving component 8. The sampling needle 5 is used to aspirate the sample to be tested, and the needle driving mechanism 7 supports the sampling needle 5 and drives it to swing left and right and move up and down. The suction driving component 8 includes, but is not limited to, driving components such as a syringe pump or syringe. The suction driving component 8 is used to quantitatively aspirate the sample to be tested. For example, the sampling needle 5 moves into a sample container containing the sample under the drive of the needle driving mechanism 7, quantitatively aspirates the sample under the drive of the suction driving component 8, and then the sample is transported to the reaction container by the needle driving mechanism 7 and mixed with reagents provided by the reagent storage device in the reaction container. The mixture is then stirred and homogenized by a stirring device to prepare the sample solution to be tested. The control device communicates with the needle driving mechanism 7 and the suction driving component 8 through a communication interface. During cleaning of the sampling needle 5, the control device controls the needle driving mechanism 7 to drive the sampling needle 5 to move to the cleaning tank 1 and to drive the sampling needle 5 to move up and down repeatedly. During sampling by the sampling needle 5, the control device controls the suction driving component 8 to aspirate the sample to be tested.

[0051] The liquid supply device includes a solenoid valve 11 connected to the pipeline (needle inner wall cleaning passage 9 and needle outer wall cleaning passage 10) and a liquid pump 12 for pumping cleaning solution. The liquid supply device is connected to the sampling needle 5 of the sampling device and the cleaning tank 1 of the cleaning device via pipelines, providing cleaning solution for cleaning the inner and outer walls of the sampling needle 5. The control device communicates with the solenoid valve 11 via a communication interface, controlling the liquid supply device to provide cleaning solution during the cleaning of the sampling needle 5.

[0052] like Figure 5 , 11 As shown, the inner wall of the sampling needle 5 is connected to the liquid supply device through a pipeline. When cleaning the inner wall of the sampling needle 5, the needle drive mechanism 7 moves the sampling needle 5 into the cleaning tank 1 of the cleaning pool. The control device controls the solenoid valve 11 located on the needle inner wall cleaning passage 9 of the liquid supply device to open, and controls the liquid pump 12 on the needle inner wall cleaning passage 9 of the liquid supply device to deliver cleaning liquid to the inner wall of the sampling needle 5 through the pipeline for cleaning the inner wall of the sampling needle 5.

[0053] Finally, this invention provides a method for cleaning a dual-needle sample dispensing needle for use in the aforementioned sample analyzer, the method comprising:

[0054] The first type: such as Figure 7 , 10As shown in Figure 12, for routine testing items, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 downward to the preset position S1, and controls the liquid supply device to supply cleaning fluid to the outlet 3 of the cleaning tank 1 to clean the outer wall of the sampling needle 5. When the sampling needle 1 is cleaned, the control device controls the solenoid valve 11 located on the needle outer wall cleaning passage 10 of the liquid supply device to close, so as to stop the delivery of cleaning fluid. Then, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 upward to the initial position S0, so as to ensure that when the sampling needle 5 leaves the needle spacer 2, the outlet 3 of the cleaning tank 1 will no longer spray cleaning fluid, preventing liquid from adhering between the needles and on the outer wall of the needle. At the same time, the upward speed of the sampling needle 5 is less than its downward speed, so that the needle spacer 2 can better scrape off or carry away the residual liquid on the outer wall of the sampling needle 5, and then leave the cleaning tank.

[0055] The second type: such as Figure 8 , 10 As shown in Figure 12, after the preset cycle or preset number of tests are completed, the control device will automatically perform an enhanced cleaning action on the sampling needle 5. That is, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 to move down to the preset position S1, then up to the initial position S0, and then down to the preset position S1 again, and so on. The sampling needle 5 performs N (N≥2) up-and-down reciprocating speed changes so that the cleaning fluid continuously washes the outer wall of the sampling needle 5 at different speeds, which can effectively improve the cleaning effect and reduce the carryover contamination rate. When the sampling needle 5 is cleaned, the control device controls the solenoid valve 11 located on the needle outer wall cleaning passage 10 of the liquid supply device to close, so as to stop the delivery of cleaning fluid. Then, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 to move up to the initial position S0, so as to ensure that when the sampling needle 5 leaves the needle spacer 2, the outlet 3 of the cleaning tank 1 no longer ejects cleaning fluid, preventing liquid from adhering between the needles and on the outer wall of the needle. Meanwhile, the speed at which the sampling needle 5 moves up to the initial position S0 for the last time is less than its previous repeated movement speed, so that the needle spacer 2 can better scrape off or remove the residual liquid on the outer wall of the sampling needle, and then leave the cleaning tank 1.

[0056] The third type: such as Figure 9 , 10As shown in Figure 12, for special tests such as glycated hemoglobin, during cleaning after sampling, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 to move down to the preset position S2, then up to the preset position S3 (S3>S1), and then down to the preset position again, and so on. The sampling needle performs N (N≥2) up-and-down reciprocating speed movements to continuously flush the outer wall of the sampling needle 5 with the cleaning fluid at varying speeds, which can effectively improve the cleaning effect and reduce the carryover contamination rate. When the sampling needle 5 is cleaned, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 to move up to the depth position S1. At this time, the control device controls the solenoid valve 11 on the needle outer wall cleaning passage 10 of the liquid supply device to close to stop the delivery of cleaning fluid. Then, the control device controls the needle drive mechanism 7 to drive the sampling needle 5 to move up to the initial position S0 to ensure that when the sampling needle 5 leaves the needle spacer 2, the outlet 3 of the cleaning tank 1 no longer ejects cleaning fluid, preventing liquid from adhering between the needles and on the outer wall of the needle. Similarly, the speed at which the sample needle 5 moves up to the initial position S0 is less than the speed at which it previously moved up and down, so that the needle spacer 2 can better scrape off or remove the residual liquid on the outer wall of the sample needle 5, and then leave the cleaning tank 1.

[0057] The third cleaning method is primarily for glycated hemoglobin testing. The sample is whole blood, and the sampling needle 5 needs to penetrate the plasma to aspirate the lower serum layer. This significant descent increases the contact length and area with the sample, greatly increasing the risk of contamination and requiring a larger cleaning area. The second cleaning method addresses the potential crystal formation that may occur after a large sample is taken from the tip of the sampling needle 5. Both methods aim to achieve essentially the same effect: utilizing the up-and-down movement of the sampling needle 5 to create a variable-speed flow of water across the needle surface, enhancing the rinsing effect and thus improving cleaning efficiency while reducing the risk of contamination.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sample dispensing needle cleaning device with a dual-needle structure, characterized in that, It includes a cleaning tank (1), a partition (2), a liquid outlet (3), and a drain outlet (4); the partition (2) is located on one side of the cleaning tank (1) and at the position between the two sample needles (5); the liquid outlet (3) is located on the other side of the cleaning tank (1) and is used to spray cleaning liquid onto the outer wall of the two sample needles (5); the drain outlet (4) is located at the bottom of the cleaning tank (1) to discharge the cleaning liquid after cleaning the sample needles (5).

2. The sample dispensing needle cleaning device with a dual-needle structure according to claim 1, characterized in that, The outlet (3) includes an inlet and an outlet that are connected to each other; the inlet is a straight structure and is connected to an external liquid supply device, and the outlet is a slanted structure for spraying cleaning liquid onto the outer wall of the sample needle (5).

3. The sample dispensing needle cleaning device with a dual-needle structure according to claim 1, characterized in that, The drain port (4) is equipped with a cleaning cup sleeve (6).

4. A sample analyzer, characterized in that, The sample needle cleaning device includes the dual-needle structure as described in any one of claims 1 to 3.

5. The sample analyzer according to claim 4, characterized in that, Also includes: The sampling device includes two sampling needles (5), a needle driving mechanism (7), and a suction driving component (8); the sampling needles (5) are used for sample or reagent sampling; the needle driving mechanism (7) supports the sampling needles (5) and drives the sampling needles (5) to move; the suction driving component (8) is connected to the sampling needles (5) to quantitatively aspirate the sample to be tested through the sampling needles (5); The liquid supply device is connected to the inside of the sample needle (5) and the liquid outlet (3) through the inner wall cleaning passage (9) and the outer wall cleaning passage (10) respectively, thereby providing cleaning liquid for cleaning the inner and outer walls of the sample needle (5); The control device is electrically connected to the needle drive mechanism (7), the sample aspiration drive component (8), and the liquid supply device. The control device controls the needle drive mechanism (7) to move the sample aspiration needle (5) into the cleaning tank (1). The control device controls the liquid supply device to inject cleaning liquid into the sample aspiration needle (5) and the cleaning tank (1). The control device controls the needle drive mechanism (7) to drive the sample aspiration needle (5) to move up and down. The control device also controls the sample aspiration drive component (8) to aspirate the sample to be tested.

6. The sample analyzer according to claim 5, characterized in that, The liquid supply device includes a solenoid valve (11) and a liquid pump (12); the solenoid valve (11) and the liquid pump (12) for pumping cleaning liquid are provided on both the needle inner wall cleaning passage (9) and the needle outer wall cleaning passage (10), and the control device is electrically connected to the solenoid valve (11).

7. The sample analyzer according to claim 5, characterized in that, The control device includes a processing unit, a storage unit, a communication interface, and an I / O interface; the processing unit, the storage unit, the communication interface, and the I / O interface are connected and communicate via a bus; the storage unit contains various computer programs that the processing unit can execute, as well as the data required to execute the computer programs.

8. A method for cleaning a sample dispensing needle with a dual-needle structure, characterized in that, The method, used in the sample analyzer as described in any one of claims 4 to 7, comprises: The control device can automatically set and run the cleaning mode according to the detection items, and the control device can automatically strengthen the cleaning of the sample dispensing needle (5) according to the preset number of detection items or time. The control device can control the needle drive mechanism (7) to move the sample dispensing needle (5) into the cleaning tank (1), and the control device controls the needle drive mechanism (7) to make the sample dispensing needle (5) move up and down relative to the cleaning tank (1); The control device can control the liquid supply device to inject cleaning liquid into the sample needle (5) and the cleaning tank (1).

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