Blood collector and blood collection device for sealing vascular access

Abstract

The utility model discloses a hemostix and a blood sampling device for sealing a vascular access, and relates to the technical field of medical instruments, and the hemostix comprises a barrel, a piston, a connecting assembly, an elastic piece, a pressing handle and a positioning structure. The piston is configured to pump blood into the cavity through the blood sampling pipeline in the process of moving from the second position to the first position; the connecting assembly is arranged on the piston and extends out of the cylinder body; the elastic piece is used for providing elastic force, so that the piston has a trend of moving towards the first position; the pressing handle is connected with the piston and used for driving the piston to move from the first position to the second position to enable the elastic piece to elastically deform and triggering the elastic piece to reset to enable the piston body to move from the second position to the first position. The positioning structure is used for positioning the pressing handle to the cylinder so that the piston can be kept at the second position. The hemostix solves the technical problem that a traditional injector is tedious and strenuous in pulling operation process and not beneficial to blood collection.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly relates to a blood sampler for a closed vascular access blood sampling device and a closed vascular access blood sampling device. Background Art

[0002] Currently, in order to reduce the risk of bacterial infection in patients and the probability of medical staff being stabbed by blood sampling needles, blood sampling is often carried out through venous / arterial vascular access.

[0003] In related technologies, the venous / arterial vascular access blood sampling device mainly uses a syringe to achieve the blood sampling function under a closed pipeline. Specifically, the vascular access blood sampling device includes components such as a blood sampling catheter, a three-way valve, and a syringe. During operation, the three-way valve is toggled to connect the piston to the vascular access, the syringe is pulled to create a vacuum so that diluted blood flows into the syringe, blood sampling is performed at the blood sampling valve at the front end of the syringe, and after blood sampling, the diluted blood is pushed back into the patient's body.

[0004] However, the current vascular access blood sampling device uses a traditional syringe to create a vacuum for blood sampling. Since the syringe needs to ensure a uniform pulling speed during the vacuum creation operation to avoid the formation of negative pressure in the blood vessel that prevents blood from flowing out due to too fast pulling, and the pulling process is also relatively cumbersome and laborious, this will increase the complexity of the operation for medical staff and is not conducive to blood sampling operation. Utility Model Content

[0005] The purpose of the present application is to provide a blood sampler for a closed vascular access blood sampling device and a closed vascular access blood sampling device, which solves the problem that the traditional syringe pulling operation process is cumbersome and laborious and is not conducive to blood sampling operation.

[0006] To achieve the above purpose, the present application provides a blood sampler for a closed vascular access blood sampling device, which is used to connect with a blood sampling pipeline. The blood sampler includes:

[0007] A cylinder body, the cylinder body has a cavity, the cavity is communicated with the blood sampling pipeline, and the cavity is used to accommodate the extracted blood;

[0008] A piston, the piston is movably arranged in the cylinder body, the piston has a first position and a second position, and the piston is configured to pump blood into the cavity through the blood sampling pipeline during the process of moving from the second position to the first position;

[0009] A connecting component, which is arranged on the piston and extends out of the cylinder body;

[0010] An elastic member, the elastic member is sleeved on the part of the connecting component that extends out of the cylinder body, and both ends of the elastic member are respectively abutted against the cylinder body and the connecting component. The elastic member is used to provide an elastic force so that the piston has a tendency to move from the second position to the first position;

[0011] A pressing handle connected to the piston, used to drive the piston to move from the first position to the second position so that the elastic member undergoes elastic deformation, and used to trigger the elastic member to reset so that the piston body moves from the second position to the first position;

[0012] The positioning structure is arranged on the pressing handle and the cylinder body, and is used to position the pressing handle on the cylinder body so that the piston is kept in the second position.

[0013] In some embodiments, the connection assembly includes:

[0014] A connecting rod is connected to the piston and extends out of the cylinder along the axis direction of the cylinder to be sleeved by the elastic member;

[0015] The cap is detachably connected to the end of the connecting rod away from the piston and is used for contacting and abutting against the elastic member.

[0016] In some embodiments, a sleeve is provided on the cylinder body, and the cap is movably arranged in the sleeve. The sleeve, the cap and the cylinder body form a sealed cavity, and the elastic member is accommodated in the sealed cavity.

[0017] In some embodiments, an end of the connecting rod facing away from the piston is provided with an external thread, and an internal thread is provided inside the cap. The internal thread and the external thread cooperate so that the cap can be detachably connected to the connecting rod.

[0018] In some embodiments, the positioning structure includes a positioning buckle and a positioning slot. The positioning buckle is arranged on the pressing handle, the positioning buckle is provided with a first locking surface, the positioning slot is arranged on the cylinder, the cylinder is provided with a second locking surface, the second locking surface is located on the side of the positioning slot close to the piston, and the first locking surface is configured to abut against the second locking surface after the positioning buckle passes over the positioning slot, so that the piston is positioned in the second position.

[0019] In some embodiments, the pressing handle includes two handle bodies, the two handle bodies are arranged on the piston opposite to each other, and positioning buckles are provided on the two handle bodies;

[0020] Any positioning buckle is also provided with a guiding inclined surface, and the guiding inclined surface is located on a side of the first locking surface close to the piston;

[0021] By pressing the two handle bodies, the two handle bodies are deformed under the cooperation of the guiding inclined surfaces and the corresponding positioning slots, so that the positioning buckles pass over the positioning slots.

[0022] In some embodiments, both handle bodies are provided with a pressing portion, and any pressing portion is provided with a pressing surface for the fingertips to press against, and the pressing surface is an arc surface.

[0023] The present application also provides a closed vascular access blood sampling device, including a blood sampling tube circuit, and also includes any of the above-mentioned blood sampling devices, the blood sampling device being connected to the blood sampling tube circuit.

[0024] In some embodiments, the blood collection device with a closed vascular access further includes a stop valve and a heparin cap. The stop valve is provided on the blood collection pipeline and is located on the side of the blood collector closer to the blood vessel. The stop valve is used to control the opening and closing of the blood collection pipeline, and the heparin cap is provided on the blood collection pipeline.

[0025] In some embodiments, the heparin cap is provided with an upward-facing socket, and the stop valve is provided with a switch handle. The switch handle is used to expose the socket when in the closed state and block the socket when in the open state.

[0026] Compared with the above background art, the blood collector of the blood collection device with a closed vascular access provided by the embodiments of the present application includes a cylinder body, a piston, a connection assembly, an elastic member, a pressing handle, and a positioning structure. Among them, the cylinder body has a cavity, and the cavity is communicated with the blood collection pipeline. The cavity is used to accommodate the extracted blood; the piston is movably arranged in the cylinder body. The piston has a first position and a second position. The piston is configured to draw blood into the cavity through the blood collection pipeline during the process of moving from the second position to the first position; the connection assembly is provided on the piston, and the connection assembly extends out of the cylinder body; the elastic member is sleeved on the part of the connection assembly extending out of the cylinder body. The two ends of the elastic member respectively abut against the cylinder body and the connection assembly. The elastic member is used to provide an elastic force so that the piston has a tendency to move from the second position to the first position; the pressing handle is connected to the piston. The pressing handle is used to drive the piston to move from the first position to the second position so that the elastic member undergoes elastic deformation, and is used to trigger the elastic member to reset so that the piston body moves from the second position to the first position; the positioning structure is provided on the pressing handle and the cylinder body. The positioning structure is used to position the pressing handle on the cylinder body so that the piston remains in the second position.

[0027] When blood collection is required, a pressing operation is performed on the pressing handle. This pressing operation will release the positioning of the pressing handle by the positioning structure, thus releasing the elastic member to reset. The elastic member returns from the deformed state to the original shape. The reset of the elastic member releases the stored energy, pushing the piston to move from the second position to the first position, so as to achieve the purpose of drawing blood into the cavity through the blood collection pipeline. After the blood collection is completed, a pressing operation is performed on the pressing handle again. The pressing handle drives the piston to move to the second position, and the pressing handle is positioned on the cylinder body through the positioning structure so that the piston is positioned at the second position. During this process, the elastic member undergoes elastic deformation, and this deformation will cause the elastic member to store energy and be ready to be released in the next step. At the same time, as the piston moves from the first position to the second position, the blood in the cylinder body can be pushed back into the human body.

[0028] With such a setting, compared with the traditional method of using a syringe for drawing and collecting blood, the blood collector provided by the embodiments of the present application has the following main beneficial effects:

[0029] First, during blood collection, by pressing the pressing handle and releasing energy through the reset of the elastic member, the piston automatically moves from the second position to the first position, so as to pump blood into the cavity of the cylinder. This blood collection operation process is easy to achieve semi-automatic blood collection, thereby improving blood collection efficiency and operation consistency.

[0030] Second, the pressing operation during blood collection is simpler and more direct. Users can easily complete it through hand movements without the need for complex pulling actions.

[0031] Third, the pressing operation during blood collection usually does not require much force, which is suitable for users of various physical levels, increasing applicability.

[0032] Fourth, the pressing operation during blood collection can quickly respond to user instructions, making the blood collection reaction time of the blood collector shorter and the operation smoother. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0034] Figure 1 It is a schematic structural diagram of the blood collector of the blood collection device for closing the blood vessel access in the embodiment of the present application;

[0035] Figure 2 It is a schematic structural diagram of the blood collection device for closing the blood vessel access in the embodiment of the present application.

[0036] Wherein:

[0037] 10 - Blood collector, 11 - Cylinder, 111 - Sleeve, 12 - Piston, 13 - Connection assembly, 131 - Connecting rod, 132 - Cap, 14 - Elastic member, 15 - Pressing handle, 151 - Handle body, 1511 - Pressing part, 1512 - Pressing surface, 16 - Positioning structure, 161 - Positioning buckle, 1611 - First locking surface, 1612 - Guide inclined surface, 162 - Positioning slot, 163 - Second locking surface;

[0038] 20 - Blood collection pipeline;

[0039] 30 - Stop valve, 31 - Switch handle;

[0040] 40 - Heparin cap, 41 - Socket. Detailed Embodiments

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0042] In order to enable those skilled in the art of this technology to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0043] It should be noted that the orientation words such as "upper end, lower end, left side, right side" described below are defined based on the accompanying drawings of the specification.

[0044] Please refer to Figure 1 , the blood collector 10 of the closed blood vessel access blood collection device provided by the embodiment of the present application includes a cylinder body 11, a piston 12, a connection assembly 13, an elastic member 14, a pressing handle 15 and a positioning structure 16.

[0045] The cylinder body 11 has a cavity, and the cavity is communicated with the blood collection pipeline. The cavity is used for accommodating the extracted blood. The cylinder body 11 can be integrally provided with the blood collection pipeline or hermetically connected to the blood collection pipeline.

[0046] The piston 12 is movably arranged in the cylinder body 11. The piston 12 has a first position and a second position. The piston 12 is configured to pump blood into the cavity through the blood collection pipeline during the process of moving from the second position to the first position. A sealing ring can be arranged between the piston 12 and the inner wall of the cylinder body 11 to ensure the sealing of the cavity during the movement of the piston 12 inside the cylinder body 11. Of course, the first position and the second position can be the top position and the bottom position in the cavity respectively.

[0047] The connection assembly 13 is arranged on the piston 12, and the connection assembly 13 extends out of the cylinder body 11. One end of the connection assembly 13 is connected to the center position of the top of the piston 12, and the other end extends upward from the center of the cylinder body 11. Such a setting is beneficial to improving the stability of the up and down movement of the piston 12.

[0048] The elastic member 14 is sleeved on the part of the connection assembly 13 that extends out of the cylinder body 11. The two ends of the elastic member 14 are respectively abutted against the cylinder body 11 and the connection assembly 13. The elastic member 14 is used to provide an elastic force, so that the piston 12 has a tendency to move from the second position to the first position. Of course, the elastic member 14 can be a compression spring. During the process of the piston 12 moving from the first position to the second position, the compression spring is compressed. At this time, the piston 12 is subjected to the elastic force of the compression spring and has a tendency to move from the second position to the first position.

[0049] The pressing handle 15 is connected to the piston 12. The pressing handle 15 and the piston 12 can be integrally formed structures. Specifically, one end of the bottom of the pressing handle 15 is connected to the piston 12, and the other end of the top extends out of the cylinder body 11 for the staff to press and operate. On the one hand, the pressing handle 15 is used to drive the piston 12 to move from the first position to the second position, causing the elastic member 14 to undergo elastic deformation. This deformation will cause the elastic member 14 to store energy and be ready to achieve blood collection after being released in the next step. On the other hand, the pressing handle 15 is also used to trigger the reset of the elastic member 14, that is, by releasing the positioning of the pressing handle 15, the piston 12 body moves from the second position to the first position under the action of the elastic member 14 to achieve the blood collection operation.

[0050] The positioning structure 16 is provided on the pressing handle 15 and the cylinder body 11. The positioning structure 16 is used to position the pressing handle 15 on the cylinder body 11 so that the piston 12 remains in the second position. Specifically, the positioning structure 16 includes a first positioning body provided on the pressing handle 15 and a second positioning body provided on the cylinder body 11. During the process of the piston 12 moving from the first position to the second position, the first positioning body and the second positioning body are cooperatively connected to achieve the purpose of positioning the pressing handle 15, so that the piston 12 remains in the second position.

[0051] When blood collection is required, a pressing operation is performed on the pressing handle 15. This pressing operation will release the positioning of the pressing handle 15 by the positioning structure 16, which will release the elastic member 14 to reset it. The elastic member 14 returns from the deformed state to its original shape. The reset of the elastic member 14 releases the stored energy and pushes the piston 12 to move from the second position to the first position, so as to achieve the purpose of pumping blood into the cavity through the blood collection pipeline.

[0052] After blood collection is completed, a pressing operation is performed on the pressing handle 15 again. The pressing handle 15 drives the piston 12 to move to the second position, and the pressing handle 15 is positioned on the cylinder body 11 through the positioning structure 16 so that the piston 12 is positioned in the second position. During this process, the elastic member 14 undergoes elastic deformation, and this deformation will cause the elastic member 14 to store energy and be ready to be released in the next step. At the same time, as the piston 12 moves from the first position to the second position, the blood in the cylinder body 11 can be pushed back into the human body.

[0053] With such a setting, compared with the traditional method of using a syringe for pulling and collecting blood, the blood collection device 10 provided by the embodiment of the present application has the following main beneficial effects:

[0054] First, during the blood collection process, the pressing handle 15 is pressed, and the elastic member 14 is reset to release energy so that the piston 12 automatically moves from the second position to the first position, so as to draw blood into the cavity of the cylinder 11. The blood collection operation process is easy to realize semi-automatic blood collection, thereby improving the blood collection efficiency and the consistency of the operation.

[0055] Secondly, the pressing operation during the blood collection process is simpler and more direct, and the user can easily complete it through hand movements without the need for complicated pulling movements.

[0056] Third, the pressing operation during the blood collection process usually does not require a lot of force, which is suitable for users of various physical strength levels, increasing applicability.

[0057] Fourthly, the pressing operation during the blood collection process can quickly respond to the user's instructions, so that the blood collection response time of the blood collection device 10 is shorter and the operation is smoother.

[0058] In some embodiments, the connecting assembly 13 includes a connecting rod 131 and a cap 132. The connecting rod 131 is connected to the piston 12, and the connecting rod 131 extends out of the cylinder 11 along the axial direction of the cylinder 11, and the portion of the connecting rod 131 extending out of the cylinder 11 is used for the elastic member 14 to be sleeved; the cap 132 is detachably connected to the end of the connecting rod 131 away from the piston 12, and the cap 132 is used to contact and abut against the elastic member 14.

[0059] In this way, the elastic member 14 can be sleeved on the portion of the connecting rod 131 extending out of the cylinder 11, the top end of the elastic member 14 can abut against the cap 132, and the bottom end of the elastic member 14 can abut against the cylinder 11. When the piston 12 moves from the first position to the second position, the connecting assembly 13 moves relative to the cylinder 11 with the piston 12, so that the elastic member 14 can be compressed, so that the elastic member 14 stores a certain amount of elastic energy to prepare for subsequent blood collection needs.

[0060] Furthermore, a sleeve 111 is disposed on the cylinder body 11 , and a cap 132 is movably disposed in the sleeve 111 . The sleeve 111 , the cap 132 and the cylinder body 11 form a sealed cavity, and the elastic member 14 is accommodated in the sealed cavity.

[0061] It can be seen that in order to strengthen the protection of the elastic member 14, a sleeve 111 is added to the top of the cylinder body 11. The sleeve 111 can be regarded as an extension section of the top of the cylinder body 11, and the inner diameter of the sleeve 111 is smaller than the inner diameter of the cylinder body 11, and the inner diameter of the sleeve 111 is larger than the outer diameter of the connecting rod 131. The cap 132 is movably arranged in the sleeve 111, and the cap 132 and the sleeve 111 are in clearance fit. A sealing ring can be added between the cap 132 and the inner wall of the sleeve 111 to ensure the sealing of the cavity below the cap 132. With such a setting, the sleeve 111, the cap 132 and the cylinder body 11 form a sealed cavity. The cap 132 moves relative to the cylinder body 11 following the piston 12 during the process of the piston 12 moving from the first position to the second position, and the elastic member 14 located inside the sealed cavity is compressed.

[0062] For the convenience of connecting the cap 132, the end of the connecting rod 131 facing away from the piston 12 is provided with an external thread, and the inside of the cap 132 is provided with an internal thread. The internal thread and the external thread cooperate to make the cap 132 detachably connected to the connecting rod 131. Adopting the detachable connection method is convenient for the installation and disassembly of the cap 132.

[0063] In some embodiments, the positioning structure 16 includes a positioning buckle 161 and a positioning slot 162. The positioning buckle 161 is arranged on the pressing handle 15. The positioning buckle 161 can be a positioning convex structure protruding towards the outside of the pressing handle 15. The positioning buckle 161 is provided with a first locking surface 1611, and the first locking surface 1611 is arranged on the side of the positioning buckle 161 facing away from the piston 12; the positioning slot 162 is arranged on the cylinder body 11, and the cylinder body 11 is provided with a second locking surface 163. The second locking surface 163 is the inner wall of the top of the cylinder body 11 on the side of the positioning slot 162 close to the piston 12. The first locking surface 1611 is configured to abut against the second locking surface 163 after the positioning buckle 161 crosses the positioning slot 162, so that the piston 12 is positioned at the second position.

[0064] Specifically, by pressing the pressing handle 15, the piston 12 and the pressing handle 15 thereon move downward. The positioning buckle 161 on the pressing handle 15 first crosses the positioning slot 162, and then the first locking surface 1611 on the positioning buckle 161 abuts against the second locking surface 163 on the cylinder body 11 to achieve the positioning effect on the pressing handle 15. At this time, the piston 12 remains in the second position, and the elastic member 14 is compressed and deformed.

[0065] In some embodiments, the pressing handle 15 includes two handle bodies 151, and the positioning buckle 161 is arranged on both of the two handle bodies 151. That is to say, the number of the positioning buckle 161 and the positioning slot 162 is two, and the two handle bodies 151 are relatively arranged on the piston 12 at a preset distance.

[0066] Further, for the convenience of positioning, any positioning buckle 161 is further provided with a guiding inclined surface 1612. The guiding inclined surface 1612 is located on the side of the first locking surface 1611 close to the piston 12. The guiding inclined surface 1612 is slidably arranged with the inner side wall of the positioning slot 162, so that the positioning buckle 161 can easily cross over the positioning slot 162.

[0067] In this way, by pressing the two handle bodies 151, the two handle bodies 151 are deformed under the cooperation of the guiding inclined surface 1612 and the corresponding positioning slot 162 (the distance between the two handle bodies 151 becomes smaller after being squeezed), so that the positioning buckle 161 crosses over the positioning slot 162. After the positioning buckle 161 crosses over the positioning slot 162, the two handle bodies 151 return to the initial position, so that the first locking surface 1611 on the positioning buckle 161 abuts against the second locking surface 163 on the cylinder body 11, so as to achieve the positioning effect on the pressing handle 15.

[0068] In some embodiments, both of the two handle bodies 151 are provided with pressing parts 1511. Any pressing part 1511 is provided with a pressing surface 1512 for a finger pulp to abut against. The pressing surface 1512 is an arc surface, and the size of the arc surface can be adjusted according to the fingers of the staff, so as to ensure the adaptation between the fingers of the staff and the pressing surface 1512 during operation.

[0069] Please refer to Figure 2 , a blood sampling device for closing a blood vessel access provided by the present application, includes a blood sampling pipeline 20, and further includes a blood sampler 10 of the blood sampling device for closing a blood vessel access described in the above specific embodiments. The blood sampler 10 is connected to the blood sampling pipeline 20.

[0070] In some embodiments, the blood sampling device for closing a blood vessel access further includes a stop valve 30 and a heparin cap 40. Among them, the stop valve 30 is arranged on the blood sampling pipeline 20. The stop valve 30 is located on the side of the blood sampler 10 close to the human blood vessel. The stop valve 30 is used to control the opening and closing of the blood sampling pipeline 20; the heparin cap 40 is arranged on the blood sampling pipeline 20.

[0071] In addition, the heparin cap 40 is provided with an upward socket 41, and the stop valve 30 is provided with a switch handle 31. The switch handle 31 is used to expose the socket 41 when in the closed state and block the socket 41 when in the open state.

[0072] During operation, open the stop valve 30 (the switch handle 31 of the stop valve 30 blocks the socket 41 of the heparin cap 40), apply a certain force to the pressing handle 15. After the positioning buckle 161 of the pressing handle 15 crosses the positioning slot 162 on the cylinder body 11, the first locking surface 1611 of the positioning buckle 161 fits with the second locking surface 163 on the cylinder body 11 to position the pressing handle 15 on the cylinder body 11. During this process, the piston 12 moves from the first position to the second position and is positioned at the second position, and the elastic member 14 undergoes compressive elastic deformation. When a certain force is applied to the pressing handle 15 again, the positioning of the pressing handle 15 by the positioning structure 16 will be released, and the elastic member 14 will be released. Under the elastic force of the elastic member 14, the piston 12 is pushed from the second position to the first position to achieve blood collection.

[0073] The blood drawing process includes: after releasing the elastic member 14, the piston 12 moves from the second position to the first position to draw a vacuum, and the diluted venous / arterial blood enters the cylinder body 11. Close the stop valve 30 (the socket 41 of the heparin cap 40 is exposed), draw the middle segment of blood at the heparin cap 40 for testing, and then open the stop valve 30, and compress the piston 12 to push the venous / arterial blood in the cylinder body 11 back into the patient's body.

[0074] Adopting the above semi-automatic operation makes the work of medical staff more concise, labor-saving, safe and effective, and can also avoid some uncertain risks.

[0075] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0076] The blood collector of the closed vascular access blood collection device and the closed vascular access blood collection device provided by the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the solution and its core idea of the present application. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A blood sampling device for a closed blood vessel access blood sampling device, used to connect to a blood sampling tube, characterized in that: The blood sampling device comprises: A barrel, the barrel having a cavity, the cavity being in communication with the blood collection tube, the cavity being used to accommodate the drawn blood; A piston, the piston is movably disposed in the cylinder, the piston has a first position and a second position, and the piston is configured to draw blood into the cavity through the blood collection tube during movement from the second position to the first position; A connecting assembly, disposed on the piston and extending out of the cylinder; an elastic member, wherein the elastic member is sleeved on the portion of the connecting assembly extending out of the cylinder, and two ends of the elastic member are respectively in contact with the cylinder and the connecting assembly, and the elastic member is used to provide elastic force so that the piston has a tendency to move from the second position to the first position; A pressing handle connected to the piston, used to drive the piston to move from the first position to the second position so that the elastic member undergoes elastic deformation, and used to trigger the elastic member to reset so that the piston body moves from the second position to the first position; A positioning structure is provided on the pressing handle and the cylinder body, and is used to position the pressing handle on the cylinder body so that the piston is maintained at the second position.

2. The blood collection device according to claim 1, characterized in that: The connection component comprises: A connecting rod, connected to the piston and extending out of the cylinder along the axis direction of the cylinder, for being sleeved by the elastic member; A cap is detachably connected to an end of the connecting rod away from the piston and is used for contacting and abutting against the elastic member.

3. The blood collection device according to claim 2, characterized in that: The cylinder body is provided with a sleeve, the cap is movably arranged in the sleeve, the sleeve, the cap and the cylinder body form a sealed cavity, and the elastic member is accommodated in the sealed cavity.

4. The blood collection device according to claim 2, characterized in that: An end of the connecting rod facing away from the piston is provided with an external thread, and an internal thread is provided inside the cap. The internal thread cooperates with the external thread so that the cap can be detachably connected to the connecting rod.

5. The blood collection device according to claim 1, characterized in that: The positioning structure includes a positioning buckle and a positioning slot, the positioning buckle is arranged on the pressing handle, the positioning buckle is provided with a first locking surface, the positioning slot is arranged on the cylinder, the cylinder is provided with a second locking surface, the second locking surface is located on the side of the positioning slot close to the piston, and the first locking surface is configured to abut against the second locking surface after the positioning buckle passes over the positioning slot, so that the piston is positioned at the second position.

6. The blood collection device according to claim 5, characterized in that: The pressing handle comprises two handle bodies, the two handle bodies are arranged on the piston opposite to each other, and the positioning buckles are arranged on the two handle bodies; Any of the positioning buckles is further provided with a guiding inclined surface, and the guiding inclined surface is located on a side of the first locking surface close to the piston; By pressing the two handle bodies, the two handle bodies are deformed under the cooperation of the guide inclined surfaces and the corresponding positioning slots, so that the positioning buckle passes over the positioning slots.

7. The blood collection device according to claim 6, characterized in that: The two handle bodies are both provided with a pressing portion, and any one of the pressing portions is provided with a pressing surface for the fingertips to press against, and the pressing surface is an arc surface.

8. A blood sampling device with a closed blood vessel access, comprising a blood sampling blood vessel access, characterized in that: It also includes a blood collection device as described in any one of claims 1 to 7, wherein the blood collection device is connected to the blood collection tube circuit.

9. The closed blood vessel access blood sampling device according to claim 8, characterized in that: The closed blood vessel access blood sampling device also includes a stop valve and a heparin cap. The stop valve is arranged on the blood sampling tube path and is located on the side of the blood sampling device close to the blood vessel. The stop valve is used to control the opening and closing of the blood sampling tube path. The heparin cap is arranged on the blood sampling tube path.

10. The closed blood vessel access blood sampling device according to claim 9, characterized in that: The heparin cap is provided with an upwardly directed socket, and the stop valve is provided with a switch handle, wherein the switch handle is used to expose the socket when in a closed state and to cover the socket when in an open state.

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