Blood sampling device

Abstract

The utility model provides a blood sampling device, and relates to the technical field of medical appliances, a first button, a second button and a third button are slidably connected to a cylinder, a user presses the first button, the first button moves relative to the cylinder, the first button drives a blood sampling needle to extend out of the cylinder, and the skin is punctured by the blood sampling needle, so that the blood sampling device is convenient to use. A user presses the second key, the second key moves relative to the barrel, the blood taking needle retracts into the barrel, meanwhile, the second key drives the sampling tube to stretch out of the barrel, blood samples are collected through the sampling tube, then the user presses the third key, the third key moves relative to the barrel, and the third key drives the tube abandoning component to push the sampling tube to move. The sampling tube is separated from the second key, so that the sampling tube and a blood sample are transferred into the sample collecting tube together, direct contact between fingers of an operator and blood is avoided in the whole blood sampling process, and meanwhile, the blood sampling device has the characteristics of simplicity and convenience in operation and coherence in blood sampling.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a blood sampling device. Background Technology

[0002] With the development of medical technology, blood samples play a crucial role in in vitro diagnostics. In the process of collecting micro-volume blood samples, common methods involve puncturing the skin with a lancet and then using a capillary glass tube to aspirate the blood sample. In current technology, the lancet and capillary glass tube are usually two separate devices. Specifically, the skin is first punctured with a lancet, then the lancet is set aside, the capillary glass tube is picked up to collect blood, and the blood sample in the capillary glass tube is then transferred to a sample collection tube. This procedure leads to interruptions in the blood collection process, affecting efficiency and continuity. Furthermore, because the capillary glass tube is transparent at both ends, after aspirating blood, the operator directly holds the glass tube containing the blood sample, posing a high risk of contamination and increasing the possibility of cross-infection. Utility Model Content

[0003] The purpose of this invention is to provide a blood sampling device to alleviate the technical problems existing in the prior art, such as the lack of continuity between blood collection and sampling, and the risk of blood sample contamination when the operator holds a glass tube containing the blood sample.

[0004] The blood sampling device provided by this utility model includes: a cylinder, a first button, a second button, a third button, a blood collection needle, a sampling tube, and a discard tube component;

[0005] The inner cavity of the cylinder can accommodate the blood collection needle, the sampling tube, and the discard tube component;

[0006] The first button, the second button, and the third button are slidably connected to the cylinder body;

[0007] The first button is movable relative to the cylinder body to cause the blood collection needle to extend out of the cylinder body;

[0008] The second button can move relative to the cylinder body to retract the blood collection needle into the cylinder body, while the sampling tube extends out of the cylinder body;

[0009] The third button is movable relative to the cylinder to drive the discarding tube component to move the sampling tube, thereby separating the sampling tube from the second button.

[0010] In an optional implementation,

[0011] The blood sampling device also includes a first connecting rod and a second connecting rod;

[0012] Both the first connecting rod and the second connecting rod are disposed inside the cylinder;

[0013] One end of the first connecting rod is connected to the first button, and the other end of the first connecting rod is connected to the needle holding block. The blood collection needle is connected to the bottom of the needle holding block.

[0014] One end of the second connecting rod is connected to the second button, and the other end of the second connecting rod is connected to the tube holding block. The sampling tube is detachably connected to the bottom of the tube holding block.

[0015] In an optional implementation,

[0016] The blood sampling device also includes a first spring;

[0017] The inner wall of the cylinder is provided with a first limiting plate, the outer wall of the first connecting rod is provided with a first fixing member, one end of the first spring is connected to the first limiting plate, and the other end of the first spring is connected to the first fixing member. The first spring is used to make the blood collection needle have a tendency to retract into the cylinder.

[0018] In an optional implementation,

[0019] The blood sampling device also includes a second spring;

[0020] The inner wall of the cylinder is provided with a second limiting plate, the outer wall of the second connecting rod is provided with a second fixing member, one end of the second spring is connected to the second limiting plate, the other end of the second spring is connected to the second fixing member, and the second spring is used to support the second button.

[0021] In an optional implementation,

[0022] The abandoned pipe component includes a third connecting rod and an abandoned pipe protrusion;

[0023] One end of the third link is connected to the third button, and the other end of the third link is connected to the discarding tube protrusion;

[0024] The tube holding block has a placement hole in the shape of an inverted frustum, which is used to install the sampling tube;

[0025] The discarding tube bump has a protrusion that can extend into the placement hole to push the sampling tube out of the placement hole.

[0026] In an optional implementation,

[0027] The abandoned pipe component also includes a third spring;

[0028] The inner wall of the cylinder is provided with a third limiting plate, the outer wall of the third connecting rod is provided with a third fixing member, one end of the third spring is connected to the third limiting plate, and the other end of the third spring is connected to the third fixing member. The third spring is used to make the discarding tube protrusion have a tendency to move away from the holding tube block.

[0029] In an optional implementation,

[0030] The inner wall of the cylinder is connected to a partition, which is disposed between the first connecting rod and the second connecting rod.

[0031] In an optional implementation,

[0032] The first connecting rod is provided with a first locking component;

[0033] The second link is provided with a second locking component;

[0034] The first locking component and the second locking component are arranged opposite to each other, and the first locking component and the second locking component can be locked together, and both the first locking component and the second locking component can abut against the partition.

[0035] In an optional implementation,

[0036] The first locking component and the second locking component have the same structure;

[0037] The top of the first locking component has a stepped surface, which can abut against the partition plate;

[0038] The first locking member has a first locking protrusion and a second locking protrusion on its side, and a locking groove is formed between the first locking protrusion and the second locking protrusion.

[0039] The first latching protrusion on the first latching member can extend into the latching groove on the second latching member, or the first latching protrusion on the second latching member can extend into the latching groove on the first latching member.

[0040] In an optional implementation,

[0041] The cylinder is provided with a first through hole, a second through hole and a third through hole;

[0042] The first button is installed in the first through hole, and the outer surface of the first button protrudes from the opening of the first through hole. The first button can move in the first through hole in a direction parallel to the partition or in a direction perpendicular to the partition.

[0043] The second button is installed in the second through hole, and the outer surface of the second button protrudes from the opening of the second through hole. The second button can move in the second through hole in a direction parallel to the partition or in a direction perpendicular to the partition.

[0044] The third button is installed in the third through hole, and the outer surface of the third button protrudes from the opening of the third through hole. The third button can move in the third through hole along a direction parallel to the partition.

[0045] The blood sampling device provided by this utility model has a first button, a second button, and a third button slidably connected on the cylinder. When the user presses the first button, the first button moves relative to the cylinder, causing the blood collection needle to extend out of the cylinder and pierce the skin. Then, the user presses the second button, which moves relative to the cylinder, causing the blood collection needle to retract into the cylinder and causing the sampling tube to extend out of the cylinder to collect the blood sample. Then, the user presses the third button, which moves relative to the cylinder, causing the tube disposal component to move the sampling tube, separating it from the second button. This transfers the sampling tube along with the blood sample to the sample collection tube. The entire blood sampling process avoids direct contact between the operator's fingers and blood. It is easy to operate and allows for a continuous blood sampling process, alleviating the technical problems of discontinuous blood collection and sampling in existing technologies, and the risk of blood sample contamination due to the operator holding a glass tube containing the blood sample. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 A cross-sectional view of the overall structure of the blood sampling device provided in this embodiment of the present invention in its natural state;

[0048] Figure 2 A cross-sectional view of the overall structure of the blood sampling device provided in this embodiment of the present invention in the blood sampling state;

[0049] Figure 3 A cross-sectional view of the overall structure of the blood sampling device provided in this embodiment of the present invention in the sampling state;

[0050] Figure 4This is a cross-sectional view of the overall structure of the blood sampling device provided in the embodiment of the present invention in the state of the sampling tube being extended;

[0051] Figure 5 A schematic diagram of the overall structure of the blood sampling device provided in this embodiment of the utility model;

[0052] Figure 6 A schematic diagram of the structure of the first button side of the blood sampling device provided in this embodiment of the utility model;

[0053] Figure 7 A schematic diagram of the second button side of the blood sampling device provided in this embodiment of the utility model;

[0054] Figure 8 A top-view structural diagram of the blood sampling device provided in an embodiment of this utility model;

[0055] Figure 9 This is a cross-sectional view of the plane containing the limiting plate in the blood collection and sampling device provided in this embodiment of the utility model;

[0056] Figure 10 This is a cross-sectional view of the plane containing the discard tube protrusion in the blood sampling device provided in this embodiment of the utility model.

[0057] Figure 11 This is a structural schematic diagram of the blood sampling device provided in an embodiment of the present invention from a bottom-view perspective.

[0058] Icons: 10-Cylinder body; 11-First limiting plate; 12-Second limiting plate; 13-Third limiting plate; 14-Partition; 15-First through hole; 16-Second through hole; 17-Third through hole; 100-First button; 110-First connecting rod; 111-First fixing component; 120-Needle holding block; 130-First spring; 200-Second button; 210-Second connecting rod; 211-Second fixing component; 220-Tube holding block; 221-Placement hole; 230-Second spring; 300-Third button; 400-Blood collection needle; 500-Sampling tube; 600-Discard tube component; 610-Third connecting rod; 611-Third fixing component; 620-Discard tube protrusion; 630-Third spring; 700-First locking component; 710-Step surface; 720-First locking protrusion; 730-Second locking protrusion; 740-Locking groove; 800-Second locking component. Detailed Implementation

[0059] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0060] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0063] like Figure 1-11 As shown, the blood sampling device provided in this embodiment includes: a cylinder 10, a first button 100, a second button 200, a third button 300, a blood collection needle 400, a sampling tube 500, and a discard tube component 600.

[0064] The lower end of the cylinder 10 is shaped like an inverted frustum. The cylinder 10 is generally pen-shaped. The inner cavity of the cylinder 10 can accommodate the blood collection needle 400, the sampling tube 500, and the discard tube component 600. A partition 14 is provided inside the cylinder 10, and the partition 14 is arranged along the axis of the cylinder 10. The first button 100, the second button 200, and the third button 300 are slidably connected to the cylinder 10. Specifically, a first through hole 15, a second through hole 16, and a third through hole 17 are opened on the side wall of the cylinder 10. The first button 100 is installed in the first through hole 15. The outer surface of the first button 100 protrudes from the opening of the first through hole 15. The first button 100 can move in the first through hole 15 in a direction parallel to the partition 14 or in a direction perpendicular to the partition 14. That is, the first button 100 can be pushed up, down, left, and right. Similarly, the second button 200 is installed in the second through hole 16. The outer surface of the second button 200 protrudes from the opening of the second through hole 16. The second button 200 can move in the second through hole 16 in a direction parallel to the partition 14 or in a direction perpendicular to the partition 14. The second button 200 can be pushed up, down, left, and right.

[0065] The third button 300 is installed in the third through hole 17. The outer surface of the third button 300 protrudes from the opening of the third through hole 17. The third button 300 can move in the third through hole 17 along a direction parallel to the partition 14. The third button 300 can only move up and down.

[0066] The first button 100 can move relative to the cylinder 10 to cause the blood collection needle 400 to extend out of the cylinder 10 or retract into the cylinder 10. Specifically, when the first button 100 is pressed inward and downward, the blood collection needle 400 extends out of the cylinder 10.

[0067] The second button 200 can move relative to the cylinder 10 to drive the sampling tube 500 out of the cylinder 10, while the blood collection needle 400 retracts into the cylinder 10. Specifically, when the second button 200 is pressed inward and downward, the sampling tube 500 extends out of the cylinder 10. When the second button 200 moves downward, it drives the first button 100 to move upward, and the blood collection needle 400 retracts into the cylinder 10.

[0068] The third button 300 can move relative to the cylinder 10 to drive the discarding tube component 600 to push the sampling tube 500 to separate the sampling tube 500 from the second button 200. Specifically, when it is necessary to separate the sampling tube 500 from the second button 200, the user presses the third button 300, the third button 300 moves downward, and the discarding tube component 600 pushes the sampling tube 500 to move relative to the second button 200, so that the sampling tube 500 can be pushed out.

[0069] The blood sampling device provided in this embodiment has a first button 100, a second button 200, and a third button 300 slidably connected to the cylinder 10. When the user presses the first button 100, the first button 100 moves relative to the cylinder 10, causing the blood collection needle 400 to extend out of the cylinder 10 and pierce the skin. Then, the user presses the second button 200, which moves relative to the cylinder 10, causing the blood collection needle 400 to retract into the cylinder 10. The second button 200 then causes the sampling tube 500 to extend out of the cylinder 10, collecting the blood sample. The user then presses the third button 300, which moves downward relative to the cylinder 10. The third button 300 drives the discard tube component 600 to move the sampling tube 500, separating the sampling tube 500 from the second button 200. This transfers the sampling tube 500 together with the blood sample into the sample collection tube. The entire blood sampling process avoids direct contact between the operator's fingers and the blood. It is easy to operate and completes blood sampling in a continuous manner, alleviating the technical problems of discontinuous blood collection and sampling in existing technologies, and the risk of blood sample contamination when the operator holds a glass tube containing the blood sample.

[0070] Based on the above embodiments, in an optional embodiment, the blood sampling device provided in this embodiment further includes a first connecting rod 110 and a second connecting rod 210; both the first connecting rod 110 and the second connecting rod 210 are disposed inside the cylinder 10; one end of the first connecting rod 110 is connected to the first button 100, and the other end of the first connecting rod 110 is connected to the needle holding block 120. The bottom of the needle holding block 120 is connected to a blood collection needle 400, thereby connecting the first button 100, the first connecting rod 110, the needle holding block 120 and the blood collection needle 400 into a whole. The user can move the blood collection needle 400 by using the first button 100.

[0071] One end of the second link 210 is connected to the second button 200, and the other end of the second link 210 is connected to the tube holding block 220. The bottom of the tube holding block 220 is detachably connected to the sampling tube 500. The user can move the sampling tube 500 by pressing the second button 200.

[0072] It should be noted that both the needle holding block 120 and the tube holding block 220 have inclined surfaces on the side near the inner wall of the cylinder 10. The inclined surfaces are parallel to the inner wall of the chamfered frustum at the bottom of the cylinder 10. When the first button 100 or the second button 200 is pressed, the inclined surfaces on the needle holding block 120 or the tube holding block 220 contact the inner wall of the chamfered frustum, which serves as a guide, causing the first connecting rod 110 or the second connecting rod 210 to move inward.

[0073] In an optional embodiment, the discard tube component 600 includes a third link 610 and a discard tube protrusion 620; one end of the third link 610 is connected to the third button 300, and the other end of the third link 610 is connected to the discard tube protrusion 620. The user can move the discard tube protrusion 620 by pressing the third button 300; the tube holding block 220 has a placement hole 221 in the shape of an inverted frustum, which is used to install the sampling tube 500. The discard tube protrusion 620 has a protrusion. When the user presses the third button 300, the protrusion extends into the placement hole 221, pushes the sampling tube 500 out of the placement hole 221, and transfers the sampling tube 500 together with the blood sample into the sample collection tube.

[0074] It should be noted that the detachable connection between the sampling tube 500 and the tube holding block 220 is specifically that the sampling tube 500 is held by the inverted frustum-shaped placement hole 221 in the tube holding block 220, wherein the lower end of the placement hole 221 is exactly the same as the diameter of the sampling tube 500, thereby holding the sampling tube 500. When the protrusion on the discarding protrusion 620 is embedded in the placement hole 221, the sampling tube 500 is pushed away from the tube holding block 220.

[0075] In an optional embodiment, the blood sampling device further includes a first spring 130; a first limiting plate 11 is provided on the inner wall of the cylinder 10, and a first fixing member 111 is provided on the outer wall of the first connecting rod 110. The first fixing member 111 is specifically two fixing blocks, which are respectively installed on both sides of the first connecting rod 110. One end of the first spring 130 is connected to the first limiting plate 11, and the other end of the first spring 130 is connected to the first fixing member 111. The first spring 130 is specifically a compression spring. The first spring 130 is used to make the blood collection needle 400 have a tendency to retract into the cylinder 10. When the user presses the first button 100, the first spring 130 is compressed, and the blood collection needle 400 extends out of the cylinder 10. In an optional embodiment, the blood sampling device further includes a second spring 230; a second limiting plate 12 is provided on the inner wall of the cylinder 10, and a second fixing member 211 is provided on the outer wall of the second connecting rod 210. The second fixing member 211 is specifically two fixing blocks, which are respectively installed on both sides of the second connecting rod 210. One end of the second spring 230 is connected to the second limiting plate 12, and the other end of the second spring 230 is connected to the second fixing member 211. The second spring 230 is specifically a compression spring, which supports the second button 200. When the user presses the second button 200, the second spring 230 is compressed, and the sampling tube 500 extends out of the cylinder 10.

[0076] In an optional embodiment, the discard tube component 600 further includes a third spring 630; a third limiting plate 13 is provided on the inner wall of the cylinder 10, and a third fixing member 611 is provided on the outer wall of the third connecting rod 610. The third fixing member 611 consists of two fixing blocks, which are respectively located on both sides of the third connecting rod 610. One end of the third spring 630 is connected to the third limiting plate 13, and the other end of the third spring 630 is connected to the third fixing member 611. Specifically, the third spring 630 is a compression spring. The third spring 630 is used to make the discard tube protrusion 620 have a tendency to move away from the tube holding block 220. When the user presses the third button 300, the third spring 630 is compressed, the discard tube protrusion 620 extends into the placement hole 221, and pushes the sampling tube 500 out of the tube holding block 220. After the third button 300 is released, the elastic force of the third spring 630 causes the third button 300 to rebound to the initial position, and the discard tube protrusion 620 returns to its original position.

[0077] Based on the above, in order to realize the first link 110 engaging and automatically retracting, the first link 110 is provided with a first locking member 700; the second link 210 is provided with a second locking member 800; the first locking member 700 and the second locking member 800 are arranged opposite to each other, the first locking member 700 and the second locking member 800 can engage with each other, and both the first locking member 700 and the second locking member 800 can abut against the partition 14.

[0078] Specifically, the top side of the first locking component 700 is recessed downward to form a stepped surface 710. The stepped surface 710 can abut against the partition 14. When the user presses the first button 100, the first button 100 needs to be pushed inward after pressing, and the stepped surface 710 can then rest against the partition 14.

[0079] The first locking member 700 has a first locking protrusion 720 and a second locking protrusion 730 on its side. A locking groove 740 is formed between the first locking protrusion 720 and the second locking protrusion 730. Since the first locking member 700 and the second locking member 800 have the same structure, the specific structure of the second locking member 800 will not be described in detail here.

[0080] The first engaging protrusion 720 on the first engaging member 700 can extend into the engaging groove 740 on the second engaging member 800, or the first engaging protrusion 720 on the second engaging member 800 can extend into the engaging groove 740 on the first engaging member 700.

[0081] When the second button 200 is pressed, the second locking component 800 pushes the first locking component 700 out of the partition 14, thereby releasing the elastic force of the first spring 130, causing the first button 100 to spring back to the initial position, and the blood collection needle 400 retracts into the cylinder 10.

[0082] The blood sampling device provided by this utility model is actually divided into two steps: blood collection and sampling. During the blood collection process, the operator pushes the first button 100 downward and inward with their finger. When the needle holding block 120 of the first connecting rod 110 contacts the inner wall of the lower end of the cylinder 10, it slides along with the first connecting rod 110 towards the central axis of the cylinder 10. This causes the first locking protrusion 720 on the first locking member 700 to be inserted into the locking groove 740 on the opposite side of the second locking member 800. At the same time, the stepped surface 710 on the first locking member 700 is exactly abutting against the lower end of the partition 14 and remains constant. At this time, the first button 100 is in the pressed state and pushes out the blood collection needle 400, which is used to puncture the finger of the sampling object.

[0083] During the sampling process, the operator pushes the second button 200 downwards and inwards. The first locking protrusion 720 on the second locking component 800 on the second connecting rod 210 slides, pushing the first locking protrusion 720 out of the locking groove 740 on the opposite side. This pushes the first connecting rod 110 away from the central axis of the cylinder 10, causing the stepped surface 710 on the first locking component 700 to no longer abut against the lower end of the partition 14. The first button 100 will spring back to its original position. At the same time, when the tube holding block 220 connected to the second connecting rod 210 contacts the inner wall of the lower end of the cylinder 10, it slides along with the second connecting rod 210 towards the central axis of the cylinder 10, thereby driving the second locking component 800... The first snap-fit ​​protrusion 720 on the 00 is embedded into the snap-fit ​​groove 740 on the opposite side. At the same time, the stepped surface 710 on the second snap-fit ​​component 800 is exactly abutting against the lower end of the partition 14 and remains constant. At this time, the second button 200 is in the pressed state and pushes out the sampling tube 500. The sampling tube 500 is specifically a capillary glass tube. It draws blood samples from the sampled object through capillary action. Then, the capillary glass tube with blood samples is aligned with the sample collection tube. The third button 300 is pressed, and the protrusion on the discard tube protrusion 620 is inserted into the placement hole 221. The capillary glass tube is pushed away from the tube holding block 220 and transferred together with a certain volume of blood sample into the sample collection tube. Thus, the blood collection and sampling operation is completed.

[0084] It should be noted that the blood sampling device is a disposable product and must be discarded after blood sampling.

[0085] In this invention, operators only need to press different buttons to complete the blood collection and sampling process. Throughout the process, the fingers do not directly contact the blood sample, the blood collection needle 400 after blood collection, or the capillary glass tube after sampling. Therefore, it has the advantages of simple operation and reduced risk of infection of operators by blood samples.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A blood sampling device, characterized in that, include: The cylinder (10), the first button (100), the second button (200), the third button (300), the blood collection needle (400), the sampling tube (500), and the tube disposal component (600); The inner cavity of the cylinder (10) can accommodate the blood collection needle (400), the sampling tube (500) and the discard tube component (600); The first button (100), the second button (200) and the third button (300) are slidably connected to the cylinder (10); The first button (100) can move relative to the cylinder (10) to drive the blood collection needle (400) to extend out of the cylinder (10); The second button (200) can move relative to the cylinder (10) to drive the blood collection needle (400) to retract into the cylinder (10), while the sampling tube (500) extends out of the cylinder (10); The third button (300) can move relative to the cylinder (10) to drive the discard tube component (600) to push the sampling tube (500) to move, so as to separate the sampling tube (500) from the second button (200).

2. The blood sampling device according to claim 1, characterized in that, The blood sampling device also includes a first connecting rod (110) and a second connecting rod (210); Both the first connecting rod (110) and the second connecting rod (210) are disposed inside the cylinder (10); One end of the first connecting rod (110) is connected to the first button (100), and the other end of the first connecting rod (110) is connected to the needle holding block (120). The bottom of the needle holding block (120) is connected to the blood collection needle (400). One end of the second connecting rod (210) is connected to the second button (200), and the other end of the second connecting rod (210) is connected to the tube holding block (220). The bottom of the tube holding block (220) is detachably connected to the sampling tube (500).

3. The blood sampling device according to claim 2, characterized in that, The blood sampling device also includes a first spring (130); The inner wall of the cylinder (10) is provided with a first limiting plate (11), the outer wall of the first connecting rod (110) is provided with a first fixing member (111), one end of the first spring (130) is connected to the first limiting plate (11), the other end of the first spring (130) is connected to the first fixing member (111), and the first spring (130) is used to make the blood collection needle (400) have a tendency to retract into the cylinder (10).

4. The blood sampling device according to claim 2, characterized in that, The blood sampling device also includes a second spring (230); The inner wall of the cylinder (10) is provided with a second limiting plate (12), the outer wall of the second connecting rod (210) is provided with a second fixing member (211), one end of the second spring (230) is connected to the second limiting plate (12), the other end of the second spring (230) is connected to the second fixing member (211), and the second spring (230) is used to support the second button (200).

5. The blood sampling device according to claim 2, characterized in that, The discarding tube component (600) includes a third link (610) and a discarding tube protrusion (620); One end of the third link (610) is connected to the third button (300), and the other end of the third link (610) is connected to the tube-discarding protrusion (620); The tube holding block (220) has a placement hole (221) in the shape of an inverted frustum, the placement hole (221) being used to install the sampling tube (500); The discarding tube bump (620) has a protrusion that can extend into the placement hole (221) to push the sampling tube (500) out of the placement hole (221).

6. The blood sampling device according to claim 5, characterized in that, The discarding tube component (600) also includes a third spring (630); The inner wall of the cylinder (10) is provided with a third limiting plate (13), the outer wall of the third connecting rod (610) is provided with a third fixing member (611), one end of the third spring (630) is connected to the third limiting plate (13), the other end of the third spring (630) is connected to the third fixing member (611), and the third spring (630) is used to make the discarding tube protrusion (620) have a tendency to move away from the holding tube block (220).

7. The blood sampling device according to claim 2, characterized in that, The inner wall of the cylinder (10) is connected to a partition (14), which is disposed between the first connecting rod (110) and the second connecting rod (210).

8. The blood sampling device according to claim 7, characterized in that, The first connecting rod (110) is provided with a first locking component (700); The second link (210) is provided with a second locking member (800); The first locking member (700) and the second locking member (800) are arranged opposite to each other, and the first locking member (700) and the second locking member (800) can be locked together, and both the first locking member (700) and the second locking member (800) can abut against the partition (14).

9. The blood sampling device according to claim 8, characterized in that, The first locking component (700) and the second locking component (800) have the same structure; The top of the first locking member (700) has a stepped surface (710), which can abut against the partition (14); The first locking member (700) has a first locking protrusion (720) and a second locking protrusion (730) on its side, and a locking groove (740) is formed between the first locking protrusion (720) and the second locking protrusion (730); The first snap-fit ​​protrusion (720) on the first snap-fit ​​member (700) can extend into the snap-fit ​​groove (740) on the second snap-fit ​​member (800), or the first snap-fit ​​protrusion (720) on the second snap-fit ​​member (800) can extend into the snap-fit ​​groove (740) on the first snap-fit ​​member (700).

10. The blood sampling device according to claim 7, characterized in that, The cylindrical body (10) is provided with a first through hole (15), a second through hole (16) and a third through hole (17); The first button (100) is installed in the first through hole (15), and the outer surface of the first button (100) protrudes from the opening of the first through hole (15). The first button (100) can move in the first through hole (15) in a direction parallel to the partition (14) or in a direction perpendicular to the partition (14). The second button (200) is installed in the second through hole (16), and the outer surface of the second button (200) protrudes from the opening of the second through hole (16). The second button (200) can move in the second through hole (16) in a direction parallel to the partition (14) or in a direction perpendicular to the partition (14). The third button (300) is installed in the third through hole (17), and the outer surface of the third button (300) protrudes from the opening of the third through hole (17). The third button (300) can move in the third through hole (17) in a direction parallel to the partition (14).

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