Blood collection device

Abstract

The invention belongs to the field of blood collection medical instruments, and particularly relates to a blood collection device which comprises a puncture needle, a blood collection connecting body, a primary blood collection structure and a blood collection structure, and a valve element switch is installed on a valve seat in the blood collection connecting body. Two-step blood collection is achieved through unique structural design, in the first step, initial blood collection is conducted firstly and mainly used for collecting possibly-polluted blood, isolation of the part of blood is achieved through design of a valve body switch, then the position of the valve body switch is adjusted, and then formal blood collection operation is conducted in the second step; therefore, the collected blood cannot be polluted due to external influence, so that the finally collected blood can be ensured to be pollution-free, and data obtained when blood sample analysis is performed on the blood of a patient is more accurate.

Description

Technical Field

[0001] The invention relates to a blood collection device, belonging to the field of blood collection medical instruments. Background Art

[0002] In the medical field, ensuring the sterility of blood collection needles is an important link, which is directly related to the health and safety of patients. Normally used blood collection needles are packaged in sterile sealed bags and undergo strict sterilization. Therefore, commercially available blood collection needles themselves remain sterile and can be used safely. However, there is a possibility of needle contamination during use, as explained below:

[0003] There is a needle at each end of the blood collection needle. One end is the puncture needle, which is responsible for puncturing the skin and blood vessels to establish a blood collection channel and ensure aseptic operation; the other end is the connection needle, which is responsible for connecting the blood collection tube and establishing a negative pressure channel to smoothly collect blood samples. Before blood collection, medical staff will routinely disinfect the patient's skin to be punctured to prevent blood collection contamination problems. However, if the disinfection operation is not standardized, or if multiple punctures occur during the blood collection process, resulting in repeated touching of the skin at the puncture site / repeated withdrawal and insertion of the needle, etc., the risk of blood contamination will increase. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a blood collection device that can realize step-by-step blood collection and collect and isolate the initially collected blood, ultimately ensuring that the collected blood is contaminated.

[0005] The blood collection device of the present invention comprises a puncture needle, a blood collection connection body, a primary blood collection structure and a blood collection structure;

[0006] The primary blood collection structure includes a blood collection needle and a vacuum blood collection tube;

[0007] The blood collection structure comprises a blood collection needle 2 and a vacuum blood collection tube 2, and the blood collection needle 2 is provided with a rubber sheath;

[0008] The blood collection connection body is provided with a hose connection end and a blood collection needle connection end, and a valve seat is provided inside the hose connection end. A hose is installed on the hose connection end and the puncture needle is connected through the hose. A second blood collection needle is installed on the blood collection needle connection end.

[0009] The valve seat is provided with a channel 1 and a channel 2 which are respectively connected with the hose connection end and the blood collection needle connection end, and a valve core switch is installed in the valve seat; a blood collection needle 1 is installed at the front end of the valve core switch, and the blood collection needle 1 is located in the front inner cavity of the blood collection connection body; two concave flow channels are radially provided on the outer periphery of the valve core switch, and the concave flow channel 1 is located behind the concave flow channel 2, and a channel 3 which is connected with the concave flow channel 1 and the blood collection needle 1 is provided inside the valve core switch; sealing members are installed at both sides of the two concave flow channels on the valve core switch;

[0010] The blood sampling connection body is provided with a positioning structure capable of locking the initial position of the valve core switch, and the blood sampling connection body is provided with a limiting structure for limiting the final position of the valve core switch;

[0011] In the initial state (i.e., when not in use), vacuum blood collection tube 1 is separated from blood collection needle 1, and blood collection needle 2 is separated from vacuum blood collection tube 2. At this time, the valve core switch is in the initial position, and channel 1 is connected to channel 3 through the concave flow channel 1; when the valve core switch is in the final position, channel 1 is connected to channel 2 through the concave flow channel 2.

[0012] The steps for collecting blood using this blood collection device are as follows:

[0013] ① Select the patient's blood collection site, tie a tourniquet, and disinfect the blood collection site;

[0014] ②Take out the blood collection device from the sterile packaging bag and insert the puncture needle into the skin and blood vessels;

[0015] ③ After the puncture is successful, hold the positioning structure on the blood collection connection body with one hand to lock the valve core switch position, and insert the vacuum blood collection tube 1 into the front cavity of the blood collection connection body with the other hand and push it inward, so that the blood collection needle 1 is inserted into the vacuum blood collection tube 1 for the initial blood collection operation. In this process, the initially collected blood is collected in the first channel, the concave flow channel 1, and the third channel in turn under the action of negative pressure and finally collected in the blood collection tube 1. Since this part of the blood may be contaminated, it is not used for sampling and analysis;

[0016] ④ Then loosen the positioning structure on the blood collection connection body, release the lock on the valve core switch position, and continue to push the vacuum blood collection tube one toward the inside of the blood collection connection body. During this process, the vacuum blood collection tube one drives the valve core switch to move until the valve core switch reaches the position of the limit structure (i.e., the final position), and the valve core switch stops moving. At this time, channel one is connected to channel two through the concave flow channel two. Then, insert the blood collection needle two into the vacuum blood collection tube two, and the blood in the blood vessel is sucked into the blood collection tube two under the action of negative pressure, completing the formal blood collection operation, and this part of the collected blood is used for sampling and analysis.

[0017] Preferably, the positioning structure includes a limit plate and a positioning spring piece, the limit plate is located in front of the valve core switch and behind the blood collection needle, the positioning spring piece is arranged on the side wall of the blood collection connection body, and a card platform is provided on the positioning spring piece; when external force acts on the positioning spring piece, the limit plate can be positioned.

[0018] There are many structural forms of the limiting structure, which can be a first limiting platform arranged on the inner wall of the blood sampling connection body or the inner wall of the valve seat, or a second limiting platform arranged at the rear end of the valve seat. The rear end of the blood sampling connection body or the valve seat can also be directly designed as a closed end and the closed end can be used as a limiting structure.

[0019] Preferably, the sealing member is an O-ring, and correspondingly, sealing grooves are provided on the outer periphery of the valve core switch at both sides of the concave flow channel 1 and the concave flow channel 2, and the O-ring is installed in each sealing groove to prevent the blood in the concave flow channel 1 and the concave flow channel 2 from flowing out of the gap between the valve core switch and the valve seat.

[0020] Preferably, the outer shells of channel 1 and channel 2 on the valve seat are fixedly connected to the blood sampling connection body through corresponding reinforcing plates, and the structural stability of the valve seat in the blood sampling connection body is enhanced by the reinforcing plates. Further preferably, the valve seat and the blood sampling connection body are integrally formed.

[0021] Preferably, a handle is provided on the blood sampling connection body. For easy operation, the handle is preferably arranged at the end of the blood sampling connection body.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention realizes two-step blood collection through a unique structural design. The first step is to perform initial blood collection, which is mainly used to collect blood that may be contaminated, and isolate this part of blood through the design of the valve body switch. Then, the position of the valve body switch is adjusted, and the second step of formal blood collection operation is performed. In this way, the collected blood will not be contaminated by external influences. Therefore, it can ensure that the blood finally collected is uncontaminated, and the data obtained when analyzing the patient's blood sample is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a blood collection device according to an embodiment;

[0025] Figure 2 is a side view of the blood sampling connection body;

[0026] Figure 3 yes Figure 2 Cross-sectional view of section AA;

[0027] Figure 4 It is a structural schematic diagram of a blood sampling connection body;

[0028] Figure 5 is a cross-sectional view of the blood sampling connection body;

[0029] Figure 6 It is a schematic diagram of the structure of the valve core switch;

[0030] Figure 7 It is a cross-sectional view of the valve core switch;

[0031] Figure 8 is a schematic diagram of using a blood collection device for initial blood collection;

[0032] Fig. 9 This is a schematic diagram of formal blood collection using a blood collection device.

[0033] In the figure: 1. Blood collection connection body; 2. Positioning spring piece; 3. Card table; 4. Hose connection end; 5. Hose; 6. Puncture needle; 7. Handle; 8. Blood collection needle connection end; 9. Rubber sheath; 10. Valve seat; 11. Valve core switch; 12. Limit plate; 13. Blood collection needle 1; 14. Channel 1; 15. Reinforcement plate; 16. Channel 2; 17. Limit structure; 18. Blood collection needle 2; 19. Channel 3; 20. O-ring; 21. Concave flow channel 2; 22. Concave flow channel 1; 23. Sealing groove; 24. Vacuum blood collection tube 1; 25. Vacuum blood collection tube 2. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0035] Example:

[0036] like Figures 1 to 7 As shown, the blood collection device described in this embodiment includes a puncture needle 6, a blood collection connection body 1, an initial blood collection structure and a blood collection structure.

[0037] The primary blood collection structure includes a blood collection needle 13 and a vacuum blood collection tube 24.

[0038] The blood collection structure comprises a blood collection needle 18 and a vacuum blood collection tube 25 . The blood collection needle 18 is provided with a rubber sheath 9 .

[0039] The blood collection connection body 1 is provided with a hose connection end 4 and a blood collection needle connection end 8, and has a valve seat 10 inside. The hose connection end 4 is provided with a hose 5 and is connected to a puncture needle 6 through the hose 5, and the blood collection needle connection end 8 is provided with a blood collection needle 18.

[0040] The valve seat 10 is provided with a channel 14 and a channel 2 16 which are respectively connected with the hose connection end 4 and the blood collection needle connection end 8, and a valve core switch 11 is installed in the valve seat 10; a blood collection needle 13 is installed at the front end of the valve core switch 11, and the blood collection needle 13 is located in the front inner cavity of the blood collection connection body 1; two concave flow channels are radially opened on the outer periphery of the valve core switch 11, and the concave flow channel 1 22 is located behind the concave flow channel 21, and a channel 3 19 which connects the concave flow channel 1 22 and the blood collection needle 13 is provided inside the valve core switch 11; seals are installed on both sides of the two concave flow channels on the valve core switch 11. The sealing member in this embodiment adopts an O-type sealing ring 20. Correspondingly, sealing grooves 23 are opened on both sides of the inner concave flow channel 1 22 and the inner concave flow channel 21 on the outer periphery of the valve core switch 11. The O-type sealing ring 20 is installed in each sealing groove 23 to prevent the blood in the inner concave flow channel 1 22 and the inner concave flow channel 21 from flowing out from the gap between the valve core switch 11 and the valve seat 10 during the blood collection process.

[0041] The blood sampling connection body 1 is provided with a positioning structure capable of locking the initial position of the valve core switch. The positioning structure in this embodiment includes a limit plate 12 and a positioning spring 2. The limit plate 12 is located in front of the valve core switch 11 and behind the blood sampling needle 13. The positioning spring 2 is arranged on the side wall of the blood sampling connection body 1. The positioning spring 2 is provided with a clamping table 3. When an external force acts on the positioning spring 2, the limit plate 12 can be positioned; after the spring is released, the limit plate 12 can be displaced under the action of the external force, thereby driving the valve core switch 11 to move in the valve seat 10.

[0042] The blood sampling connection body 1 has a limiting structure 17 for limiting the final position of the valve core switch. In this embodiment, the rear end of the valve seat 10 is directly designed as a closed end, and the closed end is used as the limiting structure 17. The limiting structure can also adopt other structural forms as long as it can limit the final position of the valve core switch.

[0043] When the blood collection device described in this embodiment is in the initial state (i.e., not in use), the vacuum blood collection tube 1 24 is separated from the blood collection needle 1 13, and the blood collection needle 2 18 is separated from the vacuum blood collection tube 2 25. At this time, the valve core switch 11 is in the initial position, and the channel 1 14 is connected to the channel 3 19 through the concave flow channel 1 22; when the valve core switch 11 is in the final position, the channel 1 14 is connected to the channel 2 16 through the concave flow channel 2 21.

[0044] In order to enhance the structural stability of the valve seat 10 in the blood sampling connection body 1, the outer shells of the channel 1 and the channel 2 on the valve seat 10 in this embodiment are fixedly connected to the blood sampling connection body 1 through corresponding reinforcing plates 15. In practical applications, the valve seat 10 and the blood sampling connection body 1 can be integrally formed.

[0045] In order to facilitate hand-held operation, a handle 7 is provided at the end of the blood sampling connection body 1 in this embodiment.

[0046] The following are the steps for blood collection using the blood collection device:

[0047] ① Select the patient's blood collection site, tie a tourniquet, and disinfect the blood collection site;

[0048] ② Take out the blood collection device from the sterile packaging bag and insert the puncture needle 6 into the skin and blood vessels;

[0049] ③ After the puncture is successful, one hand holds the positioning spring piece 2 on the blood sampling connection body 1 from both sides to lock the position of the valve core switch 11, and the other hand inserts the vacuum blood sampling tube 24 into the front cavity of the blood sampling connection body 1 and pushes it inward, so that the blood sampling needle 13 is inserted into the lumen of the vacuum blood sampling tube 24, and the initial blood collection operation is started (such as Figure 8As shown), during this process, the initially collected blood is collected in blood collection tube 1 through channel 14, concave flow channel 1 22, and channel 3 19 under the action of negative pressure. However, since this part of the blood may be contaminated, it is not used for sampling and analysis. Only an appropriate amount of blood can be collected initially.

[0050] ④ Then, loosen the positioning spring piece 2 on the blood collection connection body 1, unlock the position of the valve core switch 11, and continue to push the vacuum blood collection tube 24 toward the inside of the blood collection connection body 1. During this process, the vacuum blood collection tube 24 pushes the limit plate 12 to open the positioning spring piece 2 toward the outside of the blood collection connection body 1, and the card table 3 on the positioning spring piece 2 is separated from the limit plate 12 and loses the limiting effect. The limit plate 12 drives the valve core switch 11 to move under the push of the vacuum blood collection tube 24 until the valve core switch 11 reaches the closed end of the rear end of the valve seat 10 (i.e., the final position), and the valve core switch 11 stops moving. At this time, the channel 14 is connected with the channel 2 16 through the concave flow channel 21, and then the blood collection needle 2 18 is inserted into the vacuum blood collection tube 25 (such as Fig. 9 As shown in the figure, the blood in the blood vessel is sucked into the blood collection tube 2 under the action of negative pressure, completing the formal blood collection operation, and the collected blood is used for sampling and analysis.

[0051] It can be seen from the above blood collection steps that the blood collection device described in this embodiment can achieve two-step blood collection through a unique structural design. The blood initially collected in the first step will be collected and isolated through the vacuum blood collection tube 24, and the second step is the formal blood collection operation. The blood collected in the vacuum blood collection tube 2 25 will not be contaminated by external influences. Therefore, it can ensure that the blood finally collected is uncontaminated, and the data obtained when analyzing the patient's blood sample is more accurate.

Claims

1. A blood collection device, characterized in that: The invention comprises a puncture needle (6), a blood sampling connection body (1), an initial blood sampling structure and a blood sampling structure; the initial blood sampling structure comprises a first blood sampling needle (13) and a first vacuum blood sampling tube (24); the blood sampling structure comprises a second blood sampling needle (18) and a second vacuum blood sampling tube (25); the second blood sampling needle (18) is provided with a rubber sheath (9); the blood sampling connection body (1) is provided with a hose connection end (4) and a blood sampling needle connection end (8), a valve seat (10) is provided inside the hose connection end (4); a hose (5) is installed on the hose connection end (4) and is connected to the puncture needle (6) through the hose (5); the second blood sampling needle (18) is installed on the blood sampling needle connection end (8); The valve seat (10) is provided with a channel 1 (14) and a channel 2 (16) which are respectively connected to the hose connection end (4) and the blood collection needle connection end (8); a valve core switch (11) is installed in the valve seat (10); a blood collection needle 1 (13) is installed at the front end of the valve core switch (11), and the blood collection needle 1 (13) is located in the front inner cavity of the blood collection connection body (1); two concave flow channels are radially provided on the outer periphery of the valve core switch (11), the concave flow channel 1 (22) is located behind the concave flow channel 2 (21), and a channel 3 (19) which is connected to the concave flow channel 1 (22) and the blood collection needle 1 (13) is provided inside the valve core switch (11); sealing members are installed at both sides of the two concave flow channels on the valve core switch (11); a positioning structure capable of locking the initial position of the valve core switch is provided on the blood collection connection body (1), and a limit structure for limiting the final position of the valve core switch is provided on the blood collection connection body (1); In the initial state, vacuum blood collection tube 1 (24) is separated from blood collection needle 1 (13), and blood collection needle 2 (18) is separated from vacuum blood collection tube 2 (25). At this time, the valve core switch (11) is located in the initial position, and channel 1 (14) is connected to channel 3 (19) through the concave flow channel 1 (22); when the valve core switch (11) is located in the final position, channel 1 (14) is connected to channel 2 (16) through the concave flow channel 2 (21).

2. The blood collection device according to claim 1, characterized in that: The positioning structure comprises a limit plate (12) and a positioning spring piece (2); the limit plate (12) is located in front of the valve core switch (11) and behind the blood sampling needle (13); the positioning spring piece (2) is arranged on the side wall of the blood sampling connection body (1); and a clamping platform (3) is arranged on the positioning spring piece (2); when an external force acts on the positioning spring piece (2), the limit plate (12) can be positioned.

3. The blood collection device according to claim 1 or 2, characterized in that: The limiting structure is a first limiting platform arranged on the inner wall of the blood sampling connection body (1) or the inner wall of the valve seat (10).

4. The blood collection device according to claim 1 or 2, characterized in that: The limiting structure is a second limiting platform arranged at the rear end of the valve seat (10).

5. The blood collection device according to claim 1 or 2, characterized in that: The rear end of the blood sampling connection body (1) or the valve seat (10) is a closed end, and the closed end is the aforementioned limiting structure.

6. The blood collection device according to claim 1, characterized in that: The sealing member is an O-type sealing ring (20), and correspondingly, sealing grooves (23) are provided on both sides of the inner concave flow channel 1 (22) and the inner concave flow channel 2 (21) on the outer periphery of the valve core switch (11), and the O-type sealing ring (20) is installed in each sealing groove (23).

7. The blood collection device according to claim 1, characterized in that: The outer shells of channel 1 and channel 2 on the valve seat (10) are respectively fixedly connected to the blood sampling connection body (1) via corresponding reinforcing plates (15).

8. The blood collection device according to claim 7, characterized in that: The valve seat (10) and the blood sampling connection body (1) are integrally formed.

9. The blood collection device according to claim 1, characterized in that: A handle (7) is provided on the blood sampling connection body (1).

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