Blood sampling amount accurate control system

Abstract

The invention provides a blood sampling amount accurate control system which comprises a support, and a buffer box used for temporarily storing blood, a blood inlet assembly connected with one end of the buffer box, a blood outlet assembly connected with the other end of the buffer box, a suction assembly connected with the outer side of the buffer box and an air pressure balance assembly connected with one end of the buffer box are arranged on the support. The air pressure balance assembly is arranged close to the blood inlet assembly, and a blood volume adjusting assembly is arranged at the bottom end of the buffer box; the blood outlet assembly is connected with a collecting piece used for storing blood, a pressure sensor is arranged below the collecting piece, the pressure sensor is connected with a PLC, and the PLC is connected with the blood volume adjusting assembly; the cache box is made of transparent materials, a camera shooting assembly is arranged on the other side, opposite to the suction assembly, of the cache box, the camera shooting assembly is connected to the printing laser etching detection system, and the printing laser etching detection system is connected with the PLC. The blood sampling amount accurate control system provided by the invention can monitor the blood sampling progress in real time and improve the blood sampling precision.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a precise blood collection amount control system, which is applicable to clinical blood collection, blood detection, and blood sample collection equipment. Background Art

[0002] When collecting blood specimens, performing extracorporeal blood transfusion, or conducting extracorporeal tests, a blood collection device is often used for blood collection. However, for different blood collection items, the required blood volume is different. For example, when collecting blood samples, medical staff generally determine the collection volume based on the negative pressure in the blood collection tube and the scale of the blood collection tube. However, due to inaccurate negative pressure, unclear scale markings, and tilting of the blood collection tube, the blood collection volume is extremely inaccurate. Especially under the premise of relying on manual experience, it may affect the test results.

[0003] In addition, in terms of controlling the blood collection volume, traditional blood collection devices have the following problems in addition to the above-mentioned technical problems:

[0004] (1) It is impossible to monitor the blood collection progress in real time, which is prone to operation errors;

[0005] (2) In the prior art, some electronic blood collection devices estimate the blood volume through gravity sensing or a timer, but the accuracy is insufficient and there is a lack of dynamic adjustment ability.

[0006] Therefore, the present solution proposes a precise blood collection amount control system to solve the above-mentioned technical problems simultaneously. Summary of the Invention

[0007] The purpose of the present invention is to provide a precise blood collection amount control system, which solves the technical problems of how to monitor the blood collection progress in real time and improve the blood collection accuracy.

[0008] A precise blood collection amount control system includes a bracket, on which a buffer box for temporarily storing blood, a blood inlet component connected to one end of the buffer box, a blood outlet component connected to the other end of the buffer box, a suction component connected to the outside of the buffer box, and a pressure balance component connected to one end of the buffer box are provided. The pressure balance component is arranged close to the blood inlet component, and a blood volume adjustment component is arranged at the bottom end of the buffer box;

[0009] The blood outlet component is connected to a collection piece for storing blood, a pressure sensor is arranged below the collection piece, the pressure sensor is connected to a PLC controller, and the PLC controller is connected to the blood volume adjustment component;

[0010] The buffer box is made of a transparent material, and a camera component is arranged on the other side opposite to the suction component. The camera component is connected to a printing and laser engraving detection system, and the printing and laser engraving detection system is connected to the PLC controller.

[0011] The buffer box includes two side plates arranged in parallel with each other, a baffle assembly and a bottom plate assembly, and a top plate respectively vertically arranged between the two side plates. The baffle assembly includes baffle four, baffle one, baffle two, and baffle three arranged vertically and parallel to each other in sequence. The bottom plate assembly includes bottom plate one, bottom plate two, and bottom plate three arranged horizontally and parallel to each other in sequence;

[0012] Bottom plate three is arranged between baffle four and baffle one, bottom plate two is arranged between baffle one and baffle two, and bottom plate three is arranged between baffle two and baffle three;

[0013] The top end of baffle one is slightly higher than the top end of baffle two, the top end of baffle one is lower than the top ends of baffle one and baffle three, and the heights of bottom plate one, bottom plate two, and bottom plate three increase in sequence, forming a stepped structure.

[0014] The blood inlet assembly includes a blood collection needle, a blood collection tube with one end connected to the blood collection needle, and an electromagnetic valve arranged on the blood collection tube. The other end of the blood collection tube is communicated with the top plate.

[0015] The bleeding assembly includes a bottom cylinder with its top end communicated with bottom plate one, an outflow tube with one end communicated with the side part of the bottom cylinder, and a collection piece connected to the other end of the outflow tube. The bottom end of the bottom cylinder is connected to the free end of telescopic cylinder three, and the free end of telescopic cylinder three is connected to a blocking column, and the blocking column is slidably connected up and down inside the bottom cylinder.

[0016] The suction assembly includes a positioning cylinder vertically and fixedly communicated with the outside of the buffer box at one end, a piston cylinder docked and communicated with the positioning cylinder, and a piston slidably arranged inside the piston cylinder. One end of the piston slides into the positioning cylinder.

[0017] The air pressure balance assembly includes an air storage box, an air inlet pipe with one end communicated with the air storage box, a baffle closing one end of the air storage box, and a plurality of air holes distributed on the baffle. The other end of the air inlet pipe is connected to an air purification and disinfection machine; it also includes a barometer arranged on the buffer box.

[0018] The blood volume adjustment assembly includes telescopic cylinder one, a piston plate one fixedly connected to the free end of telescopic cylinder one, telescopic cylinder two, and a piston plate two fixedly connected to the free end of telescopic cylinder two. The piston plate one is slidably arranged up and down between baffle one and baffle two, and the piston plate two is slidably arranged up and down between baffle one and baffle four.

[0019] Scales are arranged on the outside of the buffer box, on the blood collection tube, and on the outside of the piston cylinder.

[0020] The imaging assembly includes Camera One, Camera Two, and Camera Three.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) In this solution, a buffer box is designed to achieve the following technical effects:

[0023] First, through the baffle assembly and the bottom plate assembly, a gradient distribution of the buffer box from one end to the other end is realized, so that the blood collection volume is divided into multiple regions for separate adjustment and control, which is convenient for controlling the accuracy of blood collection according to the actual situation and avoiding excessive or insufficient blood collection volume;

[0024] Second, scale lines are provided on the buffer box and cooperate with the imaging assembly, which helps to immediately judge the size of the blood collection volume, can monitor the blood collection progress in real time, and avoid errors;

[0025] (2) An inlet blood component is provided. A scale is provided on the blood collection tube, and an electromagnetic valve is also provided on the blood collection tube. In this way, when the required blood collection volume is calculated, the electromagnetic valve can be closed at any time to control the final blood collection volume. It only needs to add the blood collection volume passing through the buffer box and the blood volume in the blood collection tube, which is the entire required blood collection volume. In this solution, the blood collection volume at each position in the whole process is considered, which is more accurate than the prior art;

[0026] (3) An outlet blood component is provided. On the one hand, through the bottom cylinder and the outflow tube, the blood can be collected into the collection part. On the other hand, the bottom cylinder is blocked by the telescopic cylinder three and the blocking column to control the blood volume.

[0027] (4) A suction component is provided. When it is necessary to discharge the blood at the top of the first bottom plate, the piston cylinder and the piston are used to temporarily pump out the blood above the second bottom plate to avoid affecting the blood volume above the first bottom plate. After the blood volume above the first bottom plate is discharged, the blood volume in the piston cylinder is then discharged above the second bottom plate, playing a role in buffering the blood and ensuring the controllability and accuracy of the blood collection volume;

[0028] (5) An air pressure balance component is provided. Through the cooperation of the intake pipe and the barometer, the air pressure in the buffer box is ensured to be stable; at the same time, the intake pipe blows air onto the first piston plate and the second piston plate, which helps the remaining blood on them to quickly enter above the first bottom plate. Description of the Drawings

[0029] Figure 1 It is the front view of the precise control system in the present invention.

[0030] Figure 2 It is the structural schematic diagram of the precise control system in the present invention.

[0031] Figure 3Schematic diagram of the connection structure between the buffer box and the suction assembly in the present invention.

[0032] Figure 4 Schematic cross-sectional view of the buffer box in the present invention.

[0033] Figure 5 Schematic diagram of the structure of the suction assembly in the present invention.

[0034] Figure 6 Schematic diagram of the structure of the air pressure balance assembly in the present invention.

[0035] Figure 7 Schematic diagram of the connection structure between the buffer box and the telescopic cylinder in the present invention.

[0036] Figure 8 Schematic diagram of the installation structure of the camera assembly in the present invention.

[0037] Among them, the reference numerals are: 1, bracket; 2, buffer box; 21, first baffle; 22, second baffle; 23, third baffle; 24, first bottom plate; 241, bottom cylinder; 25, second bottom plate; 26, third bottom plate; 27, fourth baffle; 3, first telescopic cylinder; 31, first piston plate; 4, suction assembly; 41, positioning cylinder; 42, piston cylinder; 43, piston; 5, second telescopic cylinder; 51, second piston plate; 6, air pressure balance assembly; 61, intake pipe; 62, air storage box; 63, baffle; 64, air hole; 7, blood collection needle; 8, blood collection tube; 9, solenoid valve; 10, top plate; 101, first camera; 102, second camera; 103, third camera; 11, micro motor; 12, outflow pipe; 13, collection member; 14, third telescopic cylinder. Detailed implementation manners

[0038] In order to more clearly illustrate the technical features of this solution, the following elaborates on this solution through specific implementation manners.

[0039] See Figure 1 - Figure 8 , a precise blood collection volume control system, including a bracket 1, on which a buffer box 2 for temporarily storing blood, a blood inlet assembly connected to one end of the buffer box 2, a blood outlet assembly connected to the other end of the buffer box 2, a suction assembly 4 connected to the outside of the buffer box 2, and an air pressure balance assembly 6 connected to one end of the buffer box 2 are provided. The air pressure balance assembly 6 is arranged close to the blood inlet assembly, and a blood volume adjustment assembly is arranged at the bottom end of the buffer box 2;

[0040] The blood outlet assembly is connected to a collection member 13 for storing blood. A pressure sensor is arranged below the collection member 13. The pressure sensor is connected to a PLC controller, and the PLC controller is connected to the blood volume adjustment assembly;

[0041] The buffer box 2 is made of transparent material, and a camera assembly is provided on the other side opposite to the suction assembly 4. The camera assembly is connected to the printing and laser engraving detection system, and the printing and laser engraving detection system is connected to the PLC controller.

[0042] The buffer box 2 includes two side plates arranged in parallel with each other, a baffle assembly and a bottom plate assembly, and a top plate 10 that are respectively vertically arranged between the two side plates. The baffle assembly includes baffle four 27, baffle one 21, baffle two 22, and baffle three 23 that are sequentially arranged vertically and parallel to each other. The bottom plate assembly includes bottom plate one 24, bottom plate two 25, and bottom plate three 26 that are sequentially arranged horizontally and parallel to each other.

[0043] The bottom plate three 26 is arranged between the baffle four 27 and the baffle one 21. The bottom plate two 25 is arranged between the baffle one 21 and the baffle two 22. The bottom plate three 26 is arranged between the baffle two 22 and the baffle three 23.

[0044] The top end of the baffle one 21 is slightly higher than the top end of the baffle two 22. The top end of the baffle one 21 is lower than the top ends of the baffle one 21 and the baffle three 23. The heights of the bottom plate one 24, the bottom plate two 25, and the bottom plate three 26 increase in sequence, forming a stepped structure.

[0045] The blood inlet assembly includes a blood collection needle 7, a blood collection tube 8 with one end connected to the blood collection needle 7, and a solenoid valve 9 arranged on the blood collection tube 8. The other end of the blood collection tube 8 communicates with the top plate 10.

[0046] Among them, the shape of the blood collection needle 7 has various types, which are not limited in this solution, and a conventional blood collection needle can also be used.

[0047] The blood outlet assembly includes a bottom cylinder 241 with the top end communicating with the bottom plate one 24, an outflow tube 12 with one end communicating with the side part of the bottom cylinder 241, and a collecting member 13 connected to the other end of the outflow tube 12. The bottom end of the bottom cylinder 241 is connected to the free end of the telescopic cylinder three 14. The free end of the telescopic cylinder three 14 is connected to a blocking column, and the blocking column is slidably connected up and down inside the bottom cylinder 241.

[0048] In order to ensure the accuracy of the blood content, the top end of the blocking column needs to be flush with the upper end surface of the bottom plate one 24.

[0049] The suction assembly 4 includes a positioning cylinder 41 with one end vertically and fixedly communicating with the outside of the buffer box 2, a piston cylinder 42 docked and communicated with the positioning cylinder 41, and a piston 43 slidably arranged inside the piston cylinder 42. One end of the piston 43 slides into the positioning cylinder 41.

[0050] When the suction assembly 4 works, the internal air pressure of the buffer box 2 will inevitably change. At this time, the internal air pressure is sensed by a barometer, and the air flow rate of the intake pipe 61 is adjusted to control the internal air pressure of the buffer box 2.

[0051] The air pressure balance assembly 6 includes an air storage box 62, an air inlet pipe 61 with one end communicating with the air storage box 62, a baffle 63 closing one end of the air storage box 62, and a plurality of air holes 64 distributed on the baffle 63. The other end of the air inlet pipe 61 is connected to the air purification and disinfection machine; it also includes a barometer provided on the buffer box 2.

[0052] For simplicity of design, the air purification and disinfection machine is not marked in the attached drawings, and this is hereby explained.

[0053] The blood volume adjustment assembly includes a first telescopic cylinder 3, a first piston plate 31 fixedly connected to the free end of the first telescopic cylinder 3, a second telescopic cylinder 5, and a second piston plate 51 fixedly connected to the free end of the second telescopic cylinder 5. The first piston plate 31 slides up and down between a first baffle 21 and a second baffle 22, and the second piston plate 51 slides up and down between the first baffle 21 and a fourth baffle 27.

[0054] Under normal circumstances, the first piston plate 31 and the second piston plate 51 are in the low position, and when all the blood needs to be discharged, they are in the high position.

[0055] Scales are provided on the outer side of the buffer box 2, on the blood collection tube 8, and on the outer side of the piston cylinder 42.

[0056] The camera assembly includes a first camera 101, a second camera 102, and a third camera 103.

[0057] Among them, the first camera 101, the second camera 102, and the third camera 103 respectively take pictures near the top of the first baffle 21, the top of the second baffle 22, and above the first bottom plate 24.

[0058] More preferably, a rotating shaft is vertically fixed on the outer side of the buffer box 2. The rotating shaft is connected to the micro-motor 11 and is used for rotating and adjusting the buffer box 2. In the last step of blood collection, it is convenient to tilt all the blood into the area above the first bottom plate 24; the tilting of the buffer box 2, combined with blowing air from the air inlet pipe onto the first piston plate and the second piston plate, helps the rapid flow of blood.

[0059] The specific working process of the present invention is as follows:

[0060] In this solution, the buffer box 2 is designed. Through the baffle assembly and the bottom plate assembly, a gradient distribution of the buffer box 2 from one end to the other end is realized, so that the blood collection volume is divided into multiple areas for separate adjustment and control, which is convenient to control the accuracy of blood collection according to the actual situation and avoid excessive or insufficient blood collection volume;

[0061] Scale lines are provided on the buffer box, which cooperate with the camera assembly, helping to immediately judge the size of the blood collection volume and being able to monitor the blood collection progress in real time to avoid errors;

[0062] A blood inlet component is provided. There are scales on the blood collection tube 8, and a solenoid valve 9 is also provided on the blood collection tube 8. In this way, after calculating the required blood collection volume, the solenoid valve 9 can be closed at any time to control the final blood collection volume. It only needs to add the blood volume passing through the buffer box 2 and the blood volume in the blood collection tube 8, which is the entire required blood collection volume. In this solution, the blood collection volume at each position in the whole process is considered, which is more accurate than the prior art.

[0063] During the actual use process, blood enters from the blood collection tube 8 and gradually enters above the second piston plate 51. After the upper part is filled, it overflows to the other side of the first baffle 21 and enters above the first piston plate 31. After its upper part is filled, it overflows to the other side of the second baffle 22 and enters above the first bottom plate 24. At this time, the blocking column blocks the bottom cylinder 241 until the blood volume above the first bottom plate 24 is flush with the top of the second baffle 22. How to judge whether it is flush? Take a photo through the imaging component and transmit it to the printing and laser engraving detection system, and compare it with the original input photo of the printing and laser engraving detection system. If the comparison is successful, it proves that it is flush. At this time, the PLC controller controls the solenoid valve 9 to close (blood collection is paused), controls the suction component 4 to work, and sucks a part of the blood above the second bottom plate 25 into the piston cylinder 42 (since the flow of blood still has inertia, at this time, in order to ensure accurate calculation and avoid the blood above the second bottom plate 25 flowing back above the first bottom plate 24). At the same time, control the third telescopic cylinder 14 to work, the blocking column descends, and the blood enters the outflow pipe 12 until the blood above the first bottom plate 24 is emptied. At this time, the pressure sensor under the collecting part 13 senses the gravity reading and transmits it to the upper computer to judge whether the blood weight meets the requirements. Usually, a single blood collection does not meet the requirements. Judge the difference a - b between the required blood weight a and the actual blood weight b in the actual collecting part 13. What is its specific value?

[0064] Since scales are provided on the outer sides of the blood collection tube 8, the buffer box 2, and the piston cylinder 42, at this time, it is very convenient and fast to calculate the blood volume not yet collected outside the human body. Assume that the overflowing blood volume above the first piston plate 31 is c (including the blood volume in the piston cylinder 42 because a part has been sucked), the blood volume above the second piston plate 51 is d, and the blood volume inside the blood collection tube 8 is e. Therefore, when a - b is much greater than c + d + e, it means that the current blood collection volume outside the human body is far from reaching the required blood collection volume, and the above process is repeated.

[0065] In this solution, through automatic control, c + d + e gradually approaches a - b. When a - b - (c + d + e) = f, and f is less than c or d, at this time, adjust the first telescopic cylinder 3 or the second telescopic cylinder 5 to make the first piston plate 31 or the second piston plate 51 rise, so that a part of the blood volume f enters above the first bottom plate 24 and flows out through the bottom cylinder 241, and then the first telescopic cylinder 3 or the second telescopic cylinder 5 resets.

[0066] When the blood volume in the blood collection tube 8, the buffer box 2 and the piston cylinder 42 is adjusted to c + d + e again, the solenoid valve 9 is closed, and blood collection is stopped. The first piston plate 31 and the second piston plate 51 are raised so that all the blood outside the body enters above the first bottom plate 24 and finally enters the collection member 13, completing the precise blood collection work. Among them, the blood in the blood collection tube 8 enters the buffer box 2 through negative pressure;

[0067] Among them, how to determine that the first piston plate 31 is flush with the top of the second baffle 22 and the rising position of the second piston plate 51 is flush with the top of the first baffle 21 is jointly controlled and adjusted by the camera assembly and the printing and laser engraving detection system. The working principle of the printing and laser engraving detection system is prior art and will not be elaborated here.

[0068] The bleeding assembly is connected to the collection member 13 for storing blood. A pressure sensor is provided below the collection member 13. The pressure sensor is connected to the PLC controller, and the PLC controller is connected to the blood volume adjustment assembly;

[0069] The buffer box 2 is made of a transparent material, and a camera assembly is provided on the other side opposite to the suction assembly 4. The camera assembly is connected to the printing and laser engraving detection system, and the printing and laser engraving detection system is connected to the PLC controller.

[0070] A bleeding assembly is provided. On the one hand, blood can be collected into the collection member 13 through the bottom cylinder 241 and the outflow pipe 12. On the other hand, the bottom cylinder 241 is blocked by the telescopic cylinder three 14 and the blocking column to control the blood volume.

[0071] A suction assembly 4 is provided. When it is necessary to discharge the blood above the top of the first bottom plate 24, the piston cylinder 42 and the piston 43 are used to temporarily extract the blood above the second bottom plate 25 to avoid affecting the blood volume above the first bottom plate 24. After the blood volume above the first bottom plate 24 is discharged, the blood volume in the piston cylinder 42 is then discharged above the second bottom plate 25, playing a role in buffering the blood and ensuring the controllability and precision of the blood collection volume;

[0072] An air pressure balance assembly 6 is provided. Through the mutual cooperation of the air inlet pipe 61 and the barometer, the air pressure in the buffer box 2 is ensured to be stable; at the same time, the air inlet pipe 61 blows air on the first piston plate 31 and the second piston plate 51, which helps the remaining blood on them to quickly enter above the first bottom plate 24.

[0073] The technical features not described in the present invention can be realized by or adopted the prior art and will not be elaborated here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. A blood sampling volume precision control system, comprising a support (1), characterized in that: The support (1) is provided with a buffer box (2) for temporarily storing blood, a blood inlet component connected to one end of the buffer box (2), a bleeding component connected to the other end of the buffer box (2), a suction component (4) connected to the outside of the buffer box (2), and an air pressure balance component (6) connected to one end of the buffer box (2), wherein the air pressure balance component (6) is arranged close to the blood inlet component, and a blood volume regulating component is arranged at the bottom end of the buffer box (2); The bleeding component is connected to a collecting piece (13) for storing blood, a pressure sensor is provided below the collecting piece (13), the pressure sensor is connected to a PLC controller, and the PLC controller is connected to the blood volume regulating component; The buffer box (2) is made of a transparent material, and a camera assembly is provided on the other side opposite to the suction assembly (4); the camera assembly is connected to a printed laser engraving detection system, and the printed laser engraving detection system is connected to the PLC controller.

2. A blood sampling volume accurate control system according to claim 1, characterized in that: The cache box (2) comprises two side plates arranged in parallel with each other, a baffle assembly and a bottom plate assembly respectively arranged vertically between the two side plates, and a top plate (10); the baffle assembly comprises a baffle plate 4 (27), a baffle plate 1 (21), a baffle plate 2 (22) and a baffle plate 3 (23) arranged vertically in sequence and in parallel with each other; the bottom plate assembly comprises a bottom plate 1 (24), a bottom plate 2 (25) and a bottom plate 3 (26) arranged horizontally in sequence and in parallel with each other; The bottom plate three (26) is arranged between the baffle four (27) and the baffle one (21), the bottom plate two (25) is arranged between the baffle one (21) and the baffle two (22), and the bottom plate three (26) is arranged between the baffle two (22) and the baffle three (23); The top of the baffle plate 1 (21) is slightly higher than the top of the baffle plate 2 (22), and the top of the baffle plate 1 (21) is lower than the tops of the baffle plate 1 (21) and the baffle plate 3 (23). The heights of the bottom plate 1 (24), the bottom plate 2 (25) and the bottom plate 3 (26) are successively increased to form a stepped structure.

3. A blood sampling volume accurate control system according to claim 2, characterized in that: The blood supply assembly comprises a blood collection needle (7), a blood collection tube (8) one end of which is connected to the blood collection needle (7), and a solenoid valve (9) arranged on the blood collection tube (8); the other end of the blood collection tube (8) is connected to the top plate (10).

4. The blood sampling volume accurate control system according to claim 2, characterized in that: The bleeding component comprises a bottom tube (24) whose top end is connected to the bottom plate one (24), an outflow tube (12) whose one end is connected to the side of the bottom tube (24), and a collecting member (13) connected to the other end of the outflow tube (12); the bottom end of the bottom tube (24) is connected to the free end of the telescopic cylinder three (14); the free end of the telescopic cylinder three (14) is connected to a blocking column; the blocking column is connected to the inside of the bottom tube (24) in an upward and downward sliding manner.

5. The blood sampling volume accurate control system according to claim 1, characterized in that: The suction assembly (4) comprises a positioning cylinder (41) with one end vertically fixed and connected to the outside of the buffer box, a piston cylinder (42) connected to the positioning cylinder (41), and a piston (43) slidably arranged on the inside of the piston cylinder (42), and one end of the piston (43) slides into the positioning cylinder (41).

6. The blood sampling volume accurate control system according to claim 1, characterized in that: The air pressure balance component (6) comprises an air storage box (62), an air intake pipe (61) one end of which is connected to the air storage box (62), a baffle (63) sealing one end of the air storage box (62), and a plurality of air holes (64) distributed on the baffle (63); the other end of the air intake pipe (61) is connected to the air purification and disinfection machine; and also comprises a barometer arranged on the buffer box (2).

7. The blood sampling volume accurate control system according to claim 1, characterized in that: The blood volume regulating component comprises a telescopic cylinder 1 (3), a piston plate 1 (31) fixedly connected to the free end of the telescopic cylinder 1 (3), a telescopic cylinder 2 (5), and a piston plate 2 (51) fixedly connected to the free end of the telescopic cylinder 2 (5), wherein the piston plate 1 (31) is slidably disposed up and down between the baffle plate 1 (21) and the baffle plate 2 (22), and the piston plate 2 (51) is slidably disposed up and down between the baffle plate 1 (21) and the baffle plate 4 (27).

8. The blood sampling volume accurate control system according to claim 1, characterized in that: The outside of the buffer box (2), the blood collection tube (8), and the outside of the piston cylinder (42) are all provided with scales.

9. The blood sampling volume accurate control system according to claim 1, characterized in that: The camera assembly includes camera 1 (101), camera 2 (102) and camera 3 (103).

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