Medical pedal control type effusion negative pressure extraction device

Abstract

The utility model discloses a medical foot control formula hydrops negative pressure extraction device, the utility model relates to medical equipment field, include: negative pressure drainage machine body, liquid suction mechanism, sampling mechanism, foot pedal mechanism and auxiliary pedal mechanism, the bottom of negative pressure drainage machine body is provided with the bed base, the lower extreme of negative pressure drainage machine body one side is provided with waterproof sleeve, the lower extreme of negative pressure drainage machine body front is provided with power connection, the top of negative pressure drainage machine body is provided with the handle, liquid suction mechanism is used to take and store hydrops, sampling mechanism is used for sampling the hydrops sample of storage, foot pedal mechanism is used for the control start -stop negative pressure drainage machine body, auxiliary pedal mechanism is used for preventing foot pedal mechanism excessive treading, this medical foot control formula hydrops negative pressure extraction device, through the foot control start -stop and the regulation negative pressure, easy operation, medical staff can real -time adjustment according to the demand, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, specifically a medical foot-operated controlled negative pressure fluid extraction device. Background Technology

[0002] In modern medicine, the need for fluid aspiration is common. Negative pressure aspiration devices are used to treat pleural effusion, ascites, chocolate cysts, etc., and assist in diagnosis and treatment by aspirating fluid under negative pressure.

[0003] Publication number CN221266787U describes a fluid collection treatment device. This utility model can not only reduce the labor intensity of medical staff, but also sterilize the fluid and effectively prevent secondary contamination of the fluid collection tank by bacteria and viruses. However, medical staff often need to manually adjust and change syringes frequently during operation, which is not only time-consuming, but also easy to distract attention, affecting the accuracy of operation, and may even cause gas to enter the chest cavity in reverse, affecting treatment, etc.

[0004] Therefore, in order to address the shortcomings of the existing system, a medical foot-operated negative pressure aspiration device for fluid accumulation was proposed. Utility Model Content

[0005] The purpose of this invention is to provide a medical foot-operated negative pressure aspiration device for effusion, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a medical foot-operated negative pressure aspiration device, comprising: a negative pressure drainage machine body, a suction mechanism, a sampling mechanism, a foot pedal mechanism and an auxiliary foot pedal mechanism, wherein a bed base is provided at the bottom of the negative pressure drainage machine body, a waterproof sleeve is provided at the lower end of one side of the negative pressure drainage machine body, a power interface is provided at the lower end of the front of the negative pressure drainage machine body, and a handle is provided at the top of the negative pressure drainage machine body;

[0007] The liquid suction mechanism is used to absorb and store accumulated liquid;

[0008] The sampling mechanism is used to sample the stored liquid accumulation.

[0009] The foot pedal mechanism is used to control the start and stop of the negative pressure drainage machine body;

[0010] The auxiliary stepping mechanism is used to prevent excessive stepping on the foot pedal mechanism.

[0011] Furthermore, the aspiration mechanism includes a guide rubber band, a receiving tube, a card, a guide post, a negative pressure conduit, a needle connecting tube, a collection bag, and a rotating seat. A rotating seat is provided on one side of the bed base, and a telescopic support post is provided at the top of the rotating seat. A card is provided at the top of the card, and a hanging groove is opened on one side of the card. A guide rubber band is fitted inside the hanging groove. A receiving tube is provided on one side of the guide rubber band, and one end of the receiving tube is glued to the collection bag. A negative pressure conduit is provided on one side of the top of the collection bag, and a needle connecting tube is provided on the other side of the top of the collection bag. A suction needle is provided on one side of the needle connecting tube. One-way valves are provided inside both the negative pressure conduit and the needle connecting tube. Pressure sensors are provided at the connections between the negative pressure conduit, the needle connecting tube, the collection bag, and the negative pressure drainage machine body.

[0012] Furthermore, the sampling mechanism includes a liquid-collecting shell, a sampling fixed hole, an offset cone, a first anti-backflow hole, and an inlet offset cone. The liquid-collecting shell is provided through the lower end of the front of the liquid collection bag. An offset cone is provided on the front of the inner side of the liquid-collecting shell. A sampling fixed hole is provided on the upper end of the outer surface of the offset cone. A first anti-backflow hole is provided at the front end of the offset cone. An inlet offset cone is provided on the back of the inner side of the liquid-collecting shell. A second anti-backflow hole is provided on the upper end of the front of the inlet offset cone.

[0013] Furthermore, the foot pedal mechanism includes a wear-resistant cable, a foot pedal base, a micro switch body, and a foot pedal body. One end of the waterproof sleeve is provided with a wear-resistant cable, one end of the wear-resistant cable is provided with a micro switch body, the top of the micro switch body is provided with a foot pedal body, and the bottom of the micro switch body is provided with a foot pedal base.

[0014] Furthermore, a control box is provided at the connection between the wear-resistant cable and the negative pressure drainage machine body. The control box includes a microcontroller, a motor driver, a power supply circuit, a signal conditioning circuit, a communication interface circuit, and a display and alarm circuit.

[0015] Furthermore, the auxiliary pedal mechanism includes a spring base, a return spring, a pedal limiting bracket, a guide sleeve, a pedal limiting plate, and a guide post. A pedal limiting plate is provided at the front end of the bottom end of the pedal body, a guide post is provided at the bottom end of the pedal limiting plate, a guide sleeve is provided on the outer side of the bottom end of the guide post, a shock-absorbing spring is provided between the guide post and the guide sleeve, a pedal limiting bracket is provided at the bottom end of the guide sleeve, the pedal limiting bracket is composed of a horizontal plate and a vertical cylinder, a return spring is sleeved on the outer side of the vertical cylinder of the pedal limiting bracket, and a spring base is provided at the bottom of the vertical cylinder of the pedal limiting bracket.

[0016] Furthermore, the spring force coefficient of the damping spring between the guide post and the guide sleeve is different from that of the return spring.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model uses a foot pedal to control the start / stop and adjust the negative pressure, which is easy to operate. Medical staff can adjust it in real time according to their needs, thus improving work efficiency.

[0019] 2. This utility model uses an auxiliary pedal mechanism to buffer the pedaling force, prevent damage to components, and enable the foot pedal to quickly return to its original position, facilitating repeated operation;

[0020] 3. This utility model uses a special structure for the sampling mechanism to prevent the outflow of accumulated fluid, thereby obtaining samples and providing a basis for diagnosis and treatment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the foot-operated negative pressure fluid extraction device of this utility model.

[0022] Figure 2 This is an enlarged schematic diagram of a portion of the foot pedal mechanism of this utility model;

[0023] Figure 3 This is an enlarged schematic diagram of a partial connection structure of the liquid suction mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the overall structure of the foot-operated negative pressure fluid extraction device of this utility model from another perspective.

[0025] Figure 5 This is an enlarged schematic diagram showing some structural details of the liquid suction mechanism of this utility model;

[0026] Figure 6 This is a disassembly and structural diagram of the auxiliary pedal mechanism components of this utility model;

[0027] Figure 7 This is a schematic diagram of some components of the sampling mechanism of this utility model;

[0028] Figure 8 This is a schematic diagram of the component structure of the sampling mechanism of this utility model from another perspective.

[0029] In the diagram: 1. Negative pressure drainage machine body; 2. Wear-resistant cable; 3. Foot pedal base; 4. Power interface; 5. Bed base; 6. Rotary seat; 7. Sampling mechanism; 71. Liquid extraction shell; 72. Sampling fixed hole; 73. Misalignment cone; 74. First anti-backflow hole; 75. Inlet misalignment cone; 76. Second anti-backflow hole; 8. Liquid collection bag; 9. Liquid extraction needle; 10. Needle connecting tube; 11. Negative pressure conduit; 12. Handle; 13. Waterproof sleeve; 14. Foot pedal body; 15. Microswitch body; 16. Spring base; 17. Return spring; 18. Pedal limit bracket; 19. Guide sleeve; 20. Pedal limit plate; 21. Guide column; 22. Telescopic support column; 23. Card; 24. Receiving hose; 25. Guide rubber band. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1-5 As shown, a medical foot-operated negative pressure aspiration device includes: a negative pressure drainage machine body 1, a suction mechanism, a sampling mechanism 7, a foot pedal mechanism and an auxiliary foot pedal mechanism. The bottom of the negative pressure drainage machine body 1 is provided with a bed base 5, the lower end of one side of the negative pressure drainage machine body 1 is provided with a waterproof sleeve 13, the lower end of the front of the negative pressure drainage machine body 1 is provided with a power interface 4, and the top of the negative pressure drainage machine body 1 is provided with a handle 12.

[0032] The suction mechanism is used to draw up and store accumulated liquid;

[0033] Sampling mechanism 7 is used to sample the stored liquid accumulation.

[0034] The foot pedal mechanism is used to control the start and stop of the negative pressure drainage machine body 1;

[0035] The auxiliary pedal mechanism is used to prevent excessive pedaling.

[0036] The aspiration mechanism includes a guide rubber band 25, a receiving hose 24, a card 23, a guide column 21, a negative pressure conduit 11, a needle connecting tube 10, a collection bag 8, and a rotating seat 6. A rotating seat 6 is provided on one side of the bed base 5, and a telescopic support column 22 is provided at the top of the rotating seat 6. A card 23 is provided at the top of the card 23, and a hanging groove is opened on one side of the card 23. A guide rubber band 25 is fitted inside the hanging groove. A receiving hose 24 is provided on one side of the guide rubber band 25. One end of the receiving hose 24 is glued to the collection bag 8. A negative pressure conduit 11 is provided on one side of the top of the collection bag 8, and a needle connecting tube 10 is provided on the other side of the top of the collection bag 8. A suction needle 9 is provided on one side of the needle connecting tube 10. A one-way valve is provided inside both the negative pressure conduit 11 and the needle connecting tube 10. Pressure sensors are provided at the connection points between the negative pressure conduit 11, the needle connecting tube 10, the collection bag 8, and the negative pressure drainage machine body 1.

[0037] The sampling mechanism 7 includes a liquid collection shell 71, a sampling fixed hole 72, an offset cone 73, a first anti-backflow hole 74, and an inlet offset cone 75. The liquid collection shell 71 is provided through the lower end of the front of the liquid collection bag 8. The offset cone 73 is provided on the front of the inner side of the liquid collection shell 71. The sampling fixed hole 72 is provided on the upper end of the outer surface of the offset cone 73. The first anti-backflow hole 74 is provided at the front end of the offset cone 73. The inlet offset cone 75 is provided on the back of the inner side of the liquid collection shell 71. The second anti-backflow hole 76 is provided on the upper end of the front of the inlet offset cone 75.

[0038] The foot pedal mechanism includes a wear-resistant cable 2, a foot pedal base plate 3, and a micro switch body 15. One end of the waterproof sleeve 13 is provided with the wear-resistant cable 2, and the other end of the wear-resistant cable 2 is provided with the micro switch body 15. The top of the micro switch body 15 is provided with the foot pedal body 14, and the bottom of the micro switch body 15 is provided with the foot pedal base plate 3.

[0039] The auxiliary pedal mechanism includes a spring base 16, a return spring 17, a pedal limiting bracket 18, a guide sleeve 19, a pedal limiting piece 20, and a guide post 21. The pedal limiting piece 20 is provided at the front end of the bottom of the pedal body 14. The guide post 21 is provided at the bottom end of the pedal limiting piece 20. The guide sleeve 19 is provided on the outer side of the bottom end of the guide post 21. A shock-absorbing spring is provided between the guide post 21 and the guide sleeve 19. The pedal limiting bracket 18 is provided at the bottom end of the guide sleeve 19. The pedal limiting bracket 18 is composed of a horizontal plate and a vertical cylinder. The return spring 17 is sleeved on the outer side of the vertical cylinder of the pedal limiting bracket 18. The spring base 16 is provided at the bottom of the vertical cylinder of the pedal limiting bracket 18.

[0040] Example 1: First, check the appearance of the device and the connection of each component to ensure that everything is correct. Then, connect the power interface 4 to the stable power supply in the ward to charge the device and ensure that it can work continuously. Next, the medical staff adjust the height of the telescopic support column 22 through the rotatable seat 6 so that the effusion bag 8 is in a suitable position for subsequent operations.

[0041] At this point, after rigorous disinfection of the aspiration needle 9, it is precisely inserted into the patient's effusion site. Medical staff control the activation and negative pressure of the negative pressure drainage machine 1 by stepping on the foot pedal body 14. When gently stepped on, the microswitch body 15 is partially triggered, and the negative pressure drainage machine 1 starts working at a lower negative pressure. As the stepping depth increases, the negative pressure gradually increases. During the aspiration process, the pressure sensor monitors the pressure at the connection points of the negative pressure catheter 11, needle connecting tube 10, effusion bag 8, and negative pressure drainage machine 1 in real time. If abnormal pressure fluctuations occur, such as excessively high pressure which may cause the aspiration to be too fast and cause patient discomfort, or excessively low pressure which may affect the aspiration effect, the pressure sensor will feed back the signal to the control box to control the flow. The microcontroller inside the box quickly adjusts the working parameters of the negative pressure drainage machine 1 to ensure a stable and safe drainage process. When it is necessary to sample and test the drained fluid, medical staff use a sterile sampling instrument and carefully insert it through the sampling hole 72 on the drainage shell 71. Due to the special misaligned structure of the inlet misalignment cone 75 and the outlet misalignment cone 73, as well as the function of the first anti-backflow hole 74 and the second anti-backflow hole 76, the fluid in the drainage bag 8 will not flow out randomly during the insertion process. After the sampling instrument is successfully inserted and forms a passage, the fluid flows into the sampling instrument under negative pressure or its own gravity, completing accurate sampling for subsequent detailed pathological testing, providing a strong basis for the diagnosis and treatment of patients.

[0042] Throughout the operation, the auxiliary pedal mechanism plays a crucial role. When medical staff step on the foot pedal body 14, the guide post 21 moves downward within the guide sleeve 19, compressing the shock-absorbing spring and effectively buffering the stepping force. This prevents damage to components such as the micro switch body 15 due to excessive stepping. When the foot pedal is released, the reset spring 17 and the shock-absorbing spring between the guide post 21 and the guide sleeve 19 work together to quickly reset the foot pedal body 14, facilitating the next operation for medical staff and greatly improving the efficiency and convenience of fluid aspiration treatment.

[0043] Example 2: Medical staff, familiar with the device, quickly adjusted the height of the telescopic support column 22, and then quickly disinfected the aspiration needle 9 and inserted it into the patient's pleural effusion site.

[0044] When the negative pressure drainage machine 1 is started, medical staff can precisely control the negative pressure by using the foot pedal 14 according to the patient's emergency situation. Initially, to avoid causing excessive stimulation to the patient, a smaller negative pressure is started. As the patient's condition is further assessed, the foot pedal depth is gradually increased to increase the negative pressure and speed up the drainage of fluid. During this process, the pressure sensor continuously monitors the pressure data and provides timely feedback to the control box. The control box adjusts the working status of the negative pressure drainage machine 1 in real time to ensure that the drainage process is both efficient and safe.

[0045] During the drainage process, multiple samples may be required to monitor changes in the properties of the drainage fluid and provide a basis for adjusting the treatment plan. Medical staff use sampling instruments to insert into the drainage shell 71 through the sampling hole 72 to take samples multiple times. During each sampling, the misaligned cone 75, the misaligned cone 73, the first anti-backflow hole 74, and the second anti-backflow hole 76 effectively prevent unnecessary outflow of drainage fluid, ensuring the accuracy and safety of the sampling operation.

[0046] In the tense and busy environment of the emergency room, the role of the auxiliary pedal mechanism becomes even more prominent. Medical staff frequently step on the foot pedal body 14 to control the device's start and stop and adjust the negative pressure. The shock-absorbing spring between the guide column 21 and the guide sleeve 19, as well as the return spring 17, work together to not only effectively buffer the impact of frequent stepping and protect the device components, but also to allow the foot pedal body 14 to quickly return to its original position, enabling medical staff to operate more smoothly and buy precious time for patient rescue. In the emergency room scenario, the various functions of this device work closely together to provide strong support for patient treatment.

[0047] Working principle: When using this medical foot-operated negative pressure aspiration device, first start the negative pressure drainage machine body 1. The negative pressure generated is transmitted to the effusion bag 8 through the negative pressure conduit 11. Since both the negative pressure conduit 11 and the needle connecting tube 10 are equipped with one-way valves, the effusion can only flow in one direction. After inserting the aspiration needle 9 into the effusion site, under the action of negative pressure, the effusion flows through the needle connecting tube 10 into the effusion bag 8 for storage. The receiving tubing 24 is glued to the effusion bag 8 and connected through the guide rubber band 25. The card 23 is positioned and guided in the slot to ensure smooth fluid transfer. The telescopic support column 22 is set at the top of the turntable 6 to support the upper components and can be telescopically adjusted to adapt to different usage scenarios. At the same time, pressure sensors are set at the connection points of the negative pressure conduit 11, needle connecting tube 10, fluid bag 8, and negative pressure drainage machine body 1 to monitor the pressure at the connection points in real time and feed the feedback to the control box and other components to assist in controlling parameters such as negative pressure.

[0048] The sampling mechanism 7 is used to obtain liquid samples from the liquid collection bag 8. The liquid collection bag 8 has a liquid collection shell 71 that runs through the lower front end. The inner side of the shell is provided with a misalignment cone 73 and an inlet misalignment cone 75. When sampling is required, a suitable sampling instrument is inserted into the liquid collection shell 71 through the sampling hole 72. During the insertion process, due to the misalignment structure of the inlet misalignment cone 75 and the misalignment cone 73, as well as the setting of the first anti-backflow hole 74 and the second anti-backflow hole 76, the liquid will not flow out randomly under normal conditions. However, when the sampling instrument is inserted and forms a passage, the liquid can flow into the sampling instrument under negative pressure or its own gravity, thus realizing the function of convenient sample separation.

[0049] When the user presses the foot pedal body 14, the foot pedal body 14 moves downward, triggering the micro switch body 15 to close. After the micro switch body 15 closes, it transmits a start signal to the negative pressure drainage machine body 1 through the wear-resistant cable 2, and the negative pressure drainage machine body 1 starts to work. As the foot pedal depth increases, the degree to which the micro switch body 15 is triggered changes, and the signal transmitted to the negative pressure drainage machine body 1 also changes accordingly, thereby adjusting the negative pressure. This achieves the function of maximizing negative pressure when the foot pedal is fully depressed and adjusting the negative pressure according to the depth of the pressure. When the user releases the foot pedal, the micro switch opens, and the device stops working. A control box is installed at the connection between the wear-resistant cable 2 and the negative pressure drainage machine body 1. The microcontroller and other circuit modules in the control box process the signal and drive and control the motor and other components to ensure the stable implementation of the foot pedal control function. In addition, when the foot pedal is pressed... When the foot pedal is released, the guide post 21 moves downward within the guide sleeve 19, compressing the shock-absorbing spring to provide cushioning and prevent damage to the components from excessive stepping. When the foot pedal is released, the return spring 17 and the shock-absorbing spring between the guide post 21 and the guide sleeve 19 work together to reset the foot pedal body 14 for the next use. The spring force coefficient of the shock-absorbing spring between the guide post 21 and the guide sleeve 19 is different from that of the return spring 17, allowing them to play more appropriate roles in the cushioning and reset processes, respectively. Furthermore, when the user releases the foot pedal body 14, the micro switch body 15 is disconnected, the wear-resistant cable 2 transmits a stop signal, and the device stops working. At this time, the power interface 4 located at the lower front of the negative pressure drainage machine body 1 can be used to connect an external power source to charge the device, replenishing the power required for its operation and ensuring its continuous and convenient use in bedside and other scenarios.

[0050] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A medical foot-operated controlled negative pressure aspiration device for effusion, comprising: The negative pressure drainage machine body (1), the liquid suction mechanism, the sampling mechanism (7), the foot pedal mechanism and the auxiliary foot pedal mechanism are characterized in that the bottom end of the negative pressure drainage machine body (1) is provided with a bed base (5), the lower end of one side of the negative pressure drainage machine body (1) is provided with a waterproof sleeve (13), the lower end of the front of the negative pressure drainage machine body (1) is provided with a power interface (4), and the top end of the negative pressure drainage machine body (1) is provided with a handle (12). The liquid suction mechanism is used to absorb and store accumulated liquid; The sampling mechanism (7) is used to sample the stored liquid. The foot pedal mechanism is used to control the start and stop of the negative pressure drainage machine body (1). The auxiliary pedaling mechanism is used to prevent excessive pedaling. The foot pedal mechanism includes a wear-resistant cable (2), a foot pedal base plate (3), a micro switch body (15), and a foot pedal body (14). The wear-resistant cable (2) is provided at one end of the waterproof sleeve (13), the micro switch body (15) is provided at one end of the wear-resistant cable (2), the foot pedal body (14) is provided at the top of the micro switch body (15), and the foot pedal base plate (3) is provided at the bottom of the micro switch body (15). A control box is provided at the connection between the wear-resistant cable (2) and the negative pressure drainage machine body (1). The control box includes a microcontroller, a motor driver, a power supply circuit, a signal conditioning circuit, a communication interface circuit, and a display and alarm circuit. The auxiliary pedal mechanism includes a spring base (16), a return spring (17), a pedal limiting bracket (18), a guide sleeve (19), a pedal limiting piece (20), and a guide post (21). The pedal limiting piece (20) is provided at the front end of the bottom end of the pedal body (14). The guide post (21) is provided at the bottom end of the pedal limiting piece (20). The guide sleeve (19) is provided on the outer side of the bottom end of the guide post (21). A shock-absorbing spring is provided between the guide post (21) and the guide sleeve (19). The pedal limiting bracket (18) is provided at the bottom end of the guide sleeve (19). The pedal limiting bracket (18) is composed of a horizontal plate and a vertical cylinder. The return spring (17) is sleeved on the outer side of the vertical cylinder of the pedal limiting bracket (18). The spring base (16) is provided at the bottom of the vertical cylinder of the pedal limiting bracket (18). The spring force coefficient of the damping spring between the guide post (21) and the guide sleeve (19) is different from that of the return spring (17).

2. The medical foot-operated controlled negative pressure aspiration device for fluid retention according to claim 1, characterized in that, The aspiration mechanism includes a guide rubber band (25), a receiving tube (24), a card (23), a guide post (21), a negative pressure conduit (11), a needle connecting tube (10), a collection bag (8), and a rotating seat (6). A rotating seat (6) is provided on one side of the bed base (5), and a telescopic support post (22) is provided at the top of the rotating seat (6). A card (23) is provided at the top of the card (23), and a hanging groove is provided on one side of the card (23). A guide rubber band (25) is fitted inside the hanging groove, and a receiving tube is provided on one side of the guide rubber band (25). The tube (24) is glued to one end of the receiving hose (24) and the effusion bag (8). A negative pressure conduit (11) is provided on one side of the top of the effusion bag (8), and a needle connecting tube (10) is provided on the other side of the top of the effusion bag (8). A suction needle (9) is provided on one side of the needle connecting tube (10). A one-way valve is provided inside both the negative pressure conduit (11) and the needle connecting tube (10). A pressure sensor is provided at the connection between the negative pressure conduit (11), the needle connecting tube (10), the effusion bag (8), and the negative pressure drainage machine body (1).

3. A medical foot-operated controlled negative pressure aspiration device for fluid retention according to claim 2, characterized in that, The sampling mechanism (7) includes a liquid collection shell (71), a sampling fixed hole (72), an error-displacement cone (73), a first anti-backflow hole (74), and an inlet error-displacement cone (75). The liquid collection shell (71) is provided through the lower end of the front of the liquid collection bag (8). An error-displacement cone (73) is provided on the front of the inner side of the liquid collection shell (71). A sampling fixed hole (72) is provided on the upper end of the outer surface of the error-displacement cone (73). A first anti-backflow hole (74) is provided at the front end of the error-displacement cone (73). An inlet error-displacement cone (75) is provided on the back of the inner side of the liquid collection shell (71). A second anti-backflow hole (76) is provided on the upper end of the front of the inlet error-displacement cone (75).

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