A simple blood precision quantitative sampling device

Abstract

The embodiment of the present invention provides a simple blood precision quantitative sampling device, including a shell, a piston and a joint, wherein the piston is slidably arranged in the inner cavity of the shell, and the joint is fixedly arranged at the end of the shell, and the inner cavity of the joint is used to connect the inner cavity of the shell and the external environment; a liquid quantitative area, the liquid quantitative area is arranged in the inner cavity of the shell and is connected to the inner cavity of the joint, and the liquid quantitative area is used to quantitatively store liquid; a water absorption structure, the water absorption structure is arranged between the liquid quantitative area and the inner side wall of the shell. The simple blood precision quantitative sampling device provided by the present invention has a simple overall structure and no special method of use, which can realize bedside detection, rapid results and rapid diagnosis, and provide a more efficient way for the diagnosis and treatment of patients. In addition, the overall appearance of the device is similar to that of a conventional syringe, without additional pipes or injection ports, and the operation method is simple and quick. It can be directly matched and connected with a conventional test paper card for experiments without the need for additional operating steps.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment and supplies, and in particular to a simple blood precision quantitative sampling device. Background Art

[0002] In the field of medical device technology, it is often necessary to directly and accurately extract liquid blood samples from instruments such as catheters, indwelling needles or injection needles implanted in the human body, thereby providing solutions for various testing methods that require accurate and quantitative liquid blood samples for testing (such as testing accurate and quantitative blood samples through various diagnostic test strips), thereby achieving bedside testing, rapid results and rapid diagnosis.

[0003] The micro-injection devices such as micro-injectors and pipettes in the prior art are more suitable for operation in laboratory locations, and cannot directly accurately extract a fixed amount of liquid blood samples from instruments such as catheters, indwelling needles or injection needles indwelling in human blood vessels. The main reasons are as follows:

[0004] ① The catheter, indwelling needle or injection needle and other instruments built into the blood vessels are directly inserted into the human blood vessels, and the interfaces are all Luer connectors. Existing micro-injection devices such as micro-injectors and pipettes cannot be directly connected to the catheter, indwelling needle or injection needle and other instruments indwelling in the blood vessels because the connection ports do not match;

[0005] ② Even if the connection port of micro-injection equipment such as micro-injection device and pipette is successfully connected with the catheter, indwelling needle or injection needle indwelling in the blood vessel through certain technical means, it is still impossible to accurately transfer a fixed amount of blood sample due to the influence of factors such as the pressure in the human blood vessels and the viscosity of the blood itself.

[0006] Therefore, how to directly and accurately extract liquid blood samples from instruments such as catheters, indwelling needles and injection needles implanted in the human body has become a technical problem that needs to be urgently solved in the field of medical devices. Summary of the invention

[0007] In view of the technical problems described in the above background technology, the present invention provides a simple blood precision quantitative sampling device, which has the characteristics of simple structure, easy operation and the ability to achieve precise quantitative sampling of liquid blood samples.

[0008] A simple blood precision quantitative sampling device, characterized by comprising:

[0009] A housing, a piston and a joint, wherein the piston is slidably disposed in the inner cavity of the housing, the joint is fixedly disposed at the end of the housing, and the inner cavity of the joint is used to connect the inner cavity of the housing with the external environment;

[0010] A liquid quantitative area, which is arranged in the inner cavity of the shell and communicates with the inner cavity of the connector, and is used to quantitatively store liquid;

[0011] A water absorption structure is arranged between the liquid quantitative area and the inner side wall of the shell.

[0012] Furthermore, a protruding structure is fixedly provided in the inner cavity of the shell, and the accommodation space formed by the inner cavity of the protruding structure is the liquid quantitative area.

[0013] Furthermore, the connector is an external Luer connector.

[0014] Furthermore, the water absorbing structure is a water absorbing sponge.

[0015] Furthermore, it also includes a test paper card, which is arranged adjacent to the outer side wall of the shell, and an intermediate channel is provided between the test paper card and the liquid quantitative area, and the test paper card and the intermediate channel are connected.

[0016] Furthermore, it also includes a steering valve, which is arranged in the liquid quantitative area, wherein:

[0017] When the opening of the steering valve faces the liquid quantitative area and the connector respectively, the liquid quantitative area and the inner cavity of the connector are connected;

[0018] When the opening of the steering valve faces the liquid quantitative area and the intermediate channel respectively, the liquid quantitative area and the intermediate channel are communicated.

[0019] Furthermore, a test paper card sampling area is provided on the test paper card, and the test paper card sampling area and the middle channel are arranged correspondingly.

[0020] Furthermore, it also includes a one-way valve, which is arranged in the inner cavity of the connector and is used to prevent the liquid in the connector and the liquid quantitative area from flowing back.

[0021] Furthermore, the inner cavity of the shell is provided with a lower limit structure and an upper limit structure, the lower limit structure is arranged at the bottom of the upper limit structure, the lower limit structure is used to prevent the piston from sliding downward, and the upper limit structure is used to prevent the piston from sliding upward.

[0022] Furthermore, the lower limit structure and the upper limit structure are both annular protruding structures arranged on the inner side wall of the shell.

[0023] The simple blood precision quantitative sampling device provided by the present invention comprises a shell, a piston and a joint, wherein the piston is slidably arranged in the inner cavity of the shell, and the joint is fixedly arranged at the end of the shell, connecting the inner cavity of the shell and the external environment, and by pulling the piston upward, the liquid sample of the external environment can be extracted into the inner cavity of the shell through the joint. A liquid quantitative area is also arranged in the inner cavity of the shell, and the liquid quantitative area is used to quantitatively store the liquid sample. The specific principle is: when the piston is pulled upward, the liquid sample of the external environment first enters the liquid quantitative area, and when the liquid sample in the liquid quantitative area is full, the liquid sample will be retained in the liquid quantitative area under the action of atmospheric pressure, thereby realizing the quantitative and accurate extraction of the liquid sample volume. A water absorption structure is also arranged in the inner cavity of the shell, and the water absorption structure is arranged between the liquid quantitative area and the inner side wall of the shell, and the water absorption structure is used to absorb the excess liquid sample drawn into the inner cavity of the shell, and the specific principle is: the liquid sample drawn into the inner cavity of the shell first fills the liquid quantitative area, and the excess liquid sample will overflow and fall to the water absorption structure, thereby being absorbed by the water absorption structure.

[0024] In summary, the specific steps and principles of using the simple blood precision quantitative sampling device are as follows:

[0025] ①. Align the connector at the end of the housing with the liquid sample to be extracted, and pull the piston upward. As the piston moves from bottom to top, the liquid sample is drawn into the housing cavity through the inner cavity of the connector;

[0026] ② The liquid sample entering the shell cavity first enters the liquid quantitative area. When the liquid sample in the liquid quantitative area is filled, the liquid sample will be retained in the liquid quantitative area under the action of atmospheric pressure;

[0027] ③. As the piston continues to pull upward, the liquid sample exceeding the volume of the liquid quantitative area overflows and falls to the water absorption structure between the liquid quantitative area and the inner wall of the shell, and is absorbed by the water absorption structure;

[0028] ④. Finally, push the piston downward, and the liquid sample in the liquid quantitative area will be completely discharged to the required position (such as a diagnostic instrument such as a test strip), thereby completing the accurate sampling of the liquid sample.

[0029] Therefore, the simple blood precision quantitative sampling device provided by the present invention has at least the following technical effects:

[0030] a. The blood precision quantitative sampling device as a whole comprises a housing, a joint, a piston arranged in the inner cavity of the housing, a liquid quantitative area and a water absorption structure, and the overall structure is simple;

[0031] b. In actual use, the extraction and discharge of liquid samples are completed by the piston. Accurate sampling of liquid samples can be completed by pulling and pushing, which is simple and convenient to operate;

[0032] c. The excess liquid sample exceeding the volume of the liquid quantitative area is absorbed by the water absorption structure to ensure that the sample liquid discharged after pushing the piston is the sample liquid stored in the liquid quantitative area.

[0033] d. The principle of atmospheric pressure is used to retain the liquid sample filled in the liquid quantitative area in the liquid quantitative area, so as to achieve accurate volume quantification of the liquid sample, thereby realizing bedside detection, rapid results and rapid diagnosis, and providing a more efficient way for diagnosis and treatment of patients.

[0034] In addition, the overall appearance of the blood precision quantitative sampling device of the present invention is similar to that of a conventional syringe, without additional pipes or injection ports, and the operation method is simple and quick. It can be directly matched and connected with a conventional test paper card for experiments without the need for additional operating steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a first embodiment of a simple blood precision quantitative sampling device;

[0036] Figure 2 It is a schematic diagram of a first state of a second embodiment of a simple blood precision quantitative sampling device;

[0037] Figure 3 It is a schematic diagram of the second state of the second embodiment of the simple blood precision quantitative sampling device;

[0038] Explanation of the accompanying drawings: 1. one-way valve; 2. housing; 3. steering valve; 4. water absorption structure; 5. piston; 6. test paper card; 7. liquid quantitative area; 8. lower limit structure; 9. upper limit structure; 10. test paper card sampling area; 11. connector. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] See also Figure 1As shown, in the first embodiment of the present invention, the simple blood precision quantitative sampling device comprises a housing 2, a piston 5 and a joint 11, wherein the piston 5 is slidably disposed in the inner cavity of the housing 2, and the joint 11 is fixedly disposed at the end of the housing 2, and the inner cavity of the joint 11 is used to connect the inner cavity of the housing 2 with the external environment. Specifically, when the blood precision quantitative sampling device is used, the piston 5 is pulled from bottom to top, and during the sliding process of the piston 5, the air volume in the cavity of the housing 2 increases, thereby reducing its air pressure, and the atmospheric pressure of the external environment presses the liquid sample into the cavity of the housing 2 through the joint 11, completing the liquid sample extraction operation.

[0042] The simple blood precision quantitative sampling device also includes a liquid quantitative area 7, which is arranged in the inner cavity of the housing 2 and communicated with the inner cavity of the connector 11. The liquid quantitative area 7 is used to quantitatively store liquid. The liquid quantitative area 7 is used to quantitatively store liquid samples. The specific principle is that when the piston 5 is pulled upward, the liquid sample in the external environment first enters the liquid quantitative area 7. When the liquid sample in the liquid quantitative area 7 is filled, the liquid sample will be retained in the liquid quantitative area 7 under the pressure of atmospheric pressure, thereby realizing the quantitative and accurate extraction of the liquid sample volume.

[0043] The simple blood precision quantitative sampling device also includes a water absorption structure 4, which is arranged between the liquid quantitative area 7 and the inner side wall of the shell 2. The water absorption structure 4 is used to absorb the excess liquid sample drawn into the inner cavity of the shell 2. The specific principle is: the liquid sample drawn into the inner cavity of the shell 2 first fills the liquid quantitative area 7, and the excess liquid sample overflows and falls to the water absorption structure 4, and is then absorbed by the water absorption structure 4, ensuring that the sample liquid discharged after pushing the piston is the sample liquid stored in the liquid quantitative area 7.

[0044] In general, the specific steps and principles of using the blood precision quantitative sampling device are as follows:

[0045] ①, align the connector 11 at the end of the housing 2 with the liquid sample to be extracted, and pull the piston 5 upward. During the movement of the piston 5 from bottom to top, the liquid sample is drawn into the cavity of the housing 2 through the inner cavity of the connector 11;

[0046] ②, the liquid sample entering the cavity of the housing 2 first enters the liquid quantitative area 7. When the liquid sample in the liquid quantitative area 7 is filled, the liquid sample will be retained in the liquid quantitative area 7 under the action of atmospheric pressure;

[0047] ③, when the piston 5 continues to be pulled upward, the liquid sample exceeding the volume of the liquid quantitative area 7 overflows outward, falls to the water absorption structure 4 between the liquid quantitative area 7 and the inner side wall of the shell 2, and is absorbed by the water absorption structure 4;

[0048] ④. Finally, the piston 5 is pushed downward, and the liquid sample in the liquid quantitative area 7 will be completely discharged to the desired position (such as a diagnostic instrument such as a test strip), thereby finally completing the accurate sampling of the liquid sample.

[0049] Therefore, in the scheme of the first embodiment, the simple blood precision quantitative sampling device has a simple overall structure, and can complete the precise sampling of liquid samples by pulling and pushing when in use, and the operation is simple and convenient. At the same time, the liquid quantitative area 7 uses the principle of atmospheric pressure to achieve precise volume quantification of liquid samples, thereby providing solutions for various test methods that require precise quantitative liquid blood samples for detection (for example, testing precise quantitative blood samples through various diagnostic test strips), thereby achieving bedside detection, rapid results and rapid diagnosis, and providing a more efficient way for the diagnosis and treatment of patients. In addition, the overall appearance of the blood precision quantitative sampling device of the present invention is similar to that of a conventional syringe, without additional pipes or injection ports, and the operation method is simple and quick, and can be directly matched and connected with conventional test strip cards for experiments without the need for additional operating steps.

[0050] In a further solution of this embodiment, a protrusion structure is fixedly provided in the inner cavity of the housing 2, and the accommodation space formed by the inner cavity of the protrusion structure is the liquid quantitative area 7. In this further solution, the liquid quantitative area 7 is the accommodation space formed by the inner cavity of the protrusion structure formed in the inner cavity of the housing 2. More specifically, in terms of structural setting, the protrusion structure is connected to the joint 11, so that the inner cavity of the protrusion structure and the inner cavity of the joint 11 are connected, that is, the liquid quantitative area 7 and the inner cavity of the joint 11 are connected, ensuring that the liquid sample drawn from the external environment first enters the liquid quantitative area 7 after passing through the inner cavity of the joint 11. When the liquid sample in the liquid quantitative area 7 is full, the liquid sample will be retained in the liquid quantitative area 7 under the action of atmospheric pressure, so as to achieve accurate volume quantification of the liquid sample.

[0051] In the preferred embodiment of the first embodiment, the connector 11 is an external Luer connector. Specifically, the external Luer connector, also known as the Luer connector, is a standardized micro-impermeable connector widely used in medical and laboratory instruments. In the embodiment of the present invention, the external Luer connector has the advantages of simple connection and compatibility between different products.

[0052] In another preferred embodiment of the present invention, the water-absorbing structure 4 is a water-absorbing sponge. Specifically, the water-absorbing sponge is a porous material made of wood cellulose fiber or foamed plastic polymer, which has good softness and water absorption properties, and is easy to install and convenient to assemble between the liquid quantitative area 7 and the inner wall of the shell 2 during the production process; it also has good liquid absorption performance, fully absorbing the excess liquid sample overflowing from the liquid quantitative area 7, and ensuring that the sample liquid discharged after pushing the piston is the sample liquid stored in the liquid quantitative area.

[0053] Embodiment 2:

[0054] See also Figure 2 and Figure 3 As shown, in the second embodiment of the present invention, the simple blood precision quantitative sampling device also includes a test paper card 6, wherein the test paper card 6 and the outer side wall of the shell 2 are adjacently arranged, an intermediate channel is provided between the test paper card 6 and the liquid quantitative area 7, and the test paper card 6 and the intermediate channel are connected. In the scheme of this embodiment, the connector 11 is connected to an instrument such as a needle tube or a catheter that has been inserted into the human body. In the process of pulling the piston 5 from bottom to top, under the pressure of atmospheric pressure, the blood liquid in the instrument such as the needle tube or the catheter enters the inner cavity of the shell 2 through the connector 11. Specifically, since there will be a certain amount of tube sealing liquid in the instrument such as the needle tube or the catheter, the tube sealing liquid is generally extracted at the beginning, and the tube sealing liquid will be absorbed by the water absorption structure 4 after entering the inner cavity of the shell 2. More specifically, the blood liquid drawn in later will fill the liquid quantitative area 7, and stay in the liquid quantitative area 7 under the principle of atmospheric pressure, so as to realize the quantitative and accurate extraction of blood liquid volume. Furthermore, the test paper card 6 arranged on the outer side wall of the shell 2 is a diagnostic test paper, which is used to detect the accurately quantitative blood sample. After the blood in the needle tube or catheter is drawn into the liquid quantitative area 7 to complete the quantification of the blood liquid, the piston 5 is pushed downward to discharge the blood liquid in the blood quantitative area 7 onto the test paper card, thereby completing the detection of the blood sample.

[0055] In the preferred solution of the second embodiment, the connector 11 is also an external Luer connector. In this embodiment of the present invention, the external Luer connector has the advantages of easy connection and compatibility between different products. Since the change in pressure after the blood pressure in the body is withdrawn will affect the blood volume in the liquid quantitative area 7, the blood in the liquid quantitative area 7 can be directed to the desired direction before the pressure changes by rotating the steering valve 3 before the external Luer connector is withdrawn from the catheter in the body. The external Luer connector of this embodiment can be easily connected to instruments such as catheters, indwelling needles or injection needles indwelling in blood vessels, thereby effectively solving this problem.

[0056] In the preferred embodiment, the simple blood precision quantitative sampling device further includes a steering valve 3, which is disposed in the liquid quantitative area 7. When the opening of the steering valve 3 is respectively directed toward the liquid quantitative area 7 and the connector 11, the inner cavities of the liquid quantitative area 7 and the connector 11 are connected; when the opening of the steering valve 3 is respectively directed toward the liquid quantitative area 7 and the intermediate channel, the liquid quantitative area 7 and the intermediate channel are connected. In the preferred embodiment, by rotating the steering valve 3, different use states of the blood precision quantitative sampling device can be switched to realize the control of different flow directions of the blood liquid in the liquid quantitative area 7, as follows:

[0057] See also Figure 2As shown, the opening of the steering valve 3 is respectively directed toward the liquid quantitative area 7 and the connector 11, connecting the inner cavities of the liquid quantitative area 7 and the connector 11, and the device for precise quantitative sampling of blood is now in the state of drawing liquid. Specifically, since the inner cavities of the liquid quantitative area 7 and the connector 11 are connected, the piston 5 is pulled, and during the sliding process of the piston 5 from bottom to top, the blood liquid in the needle tube or catheter inserted into the human body moves upward under the pressure of atmospheric pressure, passes through the inner cavity of the connector 11 and the liquid quantitative area 7 in turn, and stays in the liquid quantitative area 7, thereby completing the operation of drawing blood liquid.

[0058] See also Figure 3 As shown, when the opening of the steering valve 3 is respectively facing the liquid quantitative area 7 and the middle channel, the liquid quantitative area 7 and the middle channel are connected, and this is the discharge state of the blood precision quantitative sampling device. Specifically, the liquid quantitative area 7 is connected to the middle channel, that is, connected to the test paper card 6 outside the shell 2, and the steering valve 3 is turned to push the piston 5. During the sliding process of the piston 5 from top to bottom, the blood liquid stored in the liquid quantitative area 7 moves to the side under the pressure of the air in the inner cavity of the shell 2, passes through the liquid quantitative area 7 and the middle channel in turn, and finally is discharged to the test paper card 6 connected to the middle channel, and the test paper card 6 completes the detection of the precisely quantitative blood sample. At the same time, by rotating the steering valve 3, the influence of the blood pressure in the human body on the blood stored in the liquid quantitative area 7 can be solved.

[0059] In a further solution of this embodiment, a test paper card sampling area 10 is provided on the test paper card 6, and the test paper card sampling area 10 is arranged corresponding to the middle channel. Specifically, the test paper card sampling area 10 is a local sampling area arranged on the test paper card 6, and it is arranged corresponding to the middle channel in the horizontal direction. When the steering valve 3 is switched to the discharge state, the piston 5 is pushed, and the blood liquid is discharged from the liquid quantitative area 7 to the middle channel, and then discharged from the middle channel to the test paper card sampling area 10, and the test paper card sampling area 10 area completes the detection and diagnosis of the blood sample.

[0060] In a further solution of this embodiment, the simple blood precision quantitative sampling device also includes a one-way valve 1, which is arranged in the inner cavity of the connector 11, wherein the one-way valve 1 is used to prevent the liquid in the connector 11 and the liquid quantitative zone 7 from backflowing, and to prevent the air in the cavity from accidentally entering the human body. Specifically, in the solution of this embodiment, the blood precision quantitative sampling device is connected to an instrument such as a needle or a catheter to extract blood from the human body. If the one-way valve 1 is not provided, under the pressure of the blood pressure in the body, the blood liquid sucked from the connector 11 into the liquid quantitative zone 7 will be discharged from the inner cavity of the connector 11 again, resulting in the phenomenon of blood liquid backflow, and the liquid quantitative zone 7 cannot achieve the effect of preserving the blood liquid. Therefore, the embodiment of the present invention provides a one-way valve 1 to ensure that the blood liquid extracted from an instrument such as a needle tube or a catheter can only flow into the liquid quantitative area 7 from the inner cavity of the connector 11, and cannot flow back from the liquid quantitative area 7 to the connector 11, thereby preventing the blood liquid sucked into the inner cavity of the shell 2 from flowing back into the instrument such as the needle tube or the catheter, so that the liquid quantitative area 7 has the function of preserving blood liquid, thereby realizing the quantitative and accurate extraction of blood liquid volume.

[0061] In the optional scheme of this embodiment, the inner cavity of the housing 2 is provided with a lower limit structure 8 and an upper limit structure 9, the lower limit structure 8 is arranged at the bottom of the upper limit structure 9, the lower limit structure 8 is used to prevent the piston 5 from sliding downward, and the upper limit structure 9 is used to prevent the piston 5 from sliding upward. In this optional scheme, the upper limit structure 9 and the lower limit structure 8 are respectively arranged at the upper and lower positions of the inner cavity of the housing 2, so as to prevent the piston 5 from sliding up and down. More specifically, a certain distance is provided between the upper limit structure 9 and the lower limit structure 8, and the distance is the movable distance of the piston 5. In the scheme of this embodiment, the distance between the upper limit structure 9 and the lower limit structure 8 is set to a preset value, so as to ensure that the excess sealing liquid and blood extracted from the needle tube or catheter and other instruments are within the absorbable range of the water absorption structure 4, thereby ensuring that the volume of the blood sample discharged after pushing the piston 5 is the volume of the blood sample accurately and quantitatively stored in the liquid quantitative area 7.

[0062] Furthermore, the lower limit structure 8 and the upper limit structure 9 are both annular protrusion structures arranged on the inner side wall of the shell 2. Specifically, by respectively arranging annular protrusion structures at the upper and lower positions of the inner side wall of the shell 2, the blocking and limiting effect of the up and down movement of the piston 5 can be achieved. This structural design method is simple and convenient, and can achieve a good blocking and limiting effect. More specifically, in the production and manufacturing process of the precise quantitative blood sampling device, the annular protrusion structures at the upper and lower positions can be directly formed on the inner side wall of the shell 2 through a processing technology, so that the lower limit structure 8, the upper limit structure 9 and the shell 2 are integrally formed, saving the assembly process between the shell 2 and the limit structure, and the structural design is reasonable.

[0063] In summary, the simple blood precision quantitative sampling device provided by the present invention has a simple overall structure and no special method of use. When in use, its connector 11 can be directly connected to instruments such as catheters, indwelling needles or injection needles in blood vessels to directly extract accurate quantitative blood samples from the human body, providing solutions for various tests that require accurate quantitative blood samples for detection (such as various diagnostic test strips that require accurate quantitative blood samples for detection), thereby achieving bedside detection, rapid results and rapid diagnosis, and providing a more efficient way for the diagnosis and treatment of patients. In addition, the overall appearance of the blood precision quantitative sampling device of the present invention is similar to that of a conventional syringe, without additional pipes or injection ports, and the operation method is simple and quick. It can be directly matched and connected with a conventional test strip card for experiments without the need for additional operating steps.

[0064] Of course, the above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A simple blood precision quantitative sampling device, characterized in that: include: A housing, a piston and a joint, wherein the piston is slidably disposed in the inner cavity of the housing, the joint is fixedly disposed at the end of the housing, and the inner cavity of the joint is used to connect the inner cavity of the housing with the external environment; A liquid quantitative area, which is arranged in the inner cavity of the shell and communicates with the inner cavity of the connector, and is used to quantitatively store liquid; A water absorbing structure, the water absorbing structure being arranged between the liquid quantitative area and the inner side wall of the shell; A test paper card, wherein the test paper card and the outer side wall of the housing are arranged adjacent to each other, an intermediate channel is provided between the test paper card and the liquid quantitative area, and the test paper card and the intermediate channel are communicated with each other; A diverter valve is provided in the liquid dosing area, wherein: When the opening of the steering valve faces the liquid quantitative area and the connector respectively, the liquid quantitative area and the inner cavity of the connector are connected; When the opening of the steering valve faces the liquid quantitative area and the intermediate channel respectively, the liquid quantitative area and the intermediate channel are communicated.

2. The simple blood precise quantitative sampling device according to claim 1, characterized in that: The inner cavity of the shell is fixedly provided with a protruding structure, and the accommodation space formed by the inner cavity of the protruding structure is the liquid quantitative area.

3. The simple blood precise quantitative sampling device according to claim 2, characterized in that: The connector is an external Luer connector.

4. The simple blood precise quantitative sampling device according to claim 2, characterized in that: The water absorbing structure is a water absorbing sponge.

5. The simple blood precise quantitative sampling device according to claim 1, characterized in that: The test paper card is provided with a test paper card sampling area, and the test paper card sampling area and the middle channel are arranged correspondingly.

6. The simple blood precise quantitative sampling device according to claim 5, characterized in that: It also includes a one-way valve, which is arranged in the inner cavity of the connector and is used to prevent the liquid in the connector and the liquid quantitative area from flowing back.

7. The simple blood precise quantitative sampling device according to claim 2, characterized in that: The inner cavity of the shell is provided with a lower limit structure and an upper limit structure, wherein the lower limit structure is arranged at the bottom of the upper limit structure, the lower limit structure is used to prevent the piston from sliding downward, and the upper limit structure is used to prevent the piston from sliding upward.

8. The simple blood precise quantitative sampling device according to claim 7, characterized in that: The lower limit structure and the upper limit structure are both annular protruding structures arranged on the inner side wall of the shell.

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