Syringe switch valve capable of preventing blood accumulation

Abstract

The invention relates to the technical field of biomedicine, in particular to an injector switch valve capable of preventing blood accumulation. Comprising a valve body, the valve body is internally provided with a first liquid guide channel, a second liquid guide channel and a cleaning liquid filling channel, the valve body is in sealed rotation and is in sliding connection with a rotating part, the rotating part is internally provided with a first channel and a second channel, the first channel is used for communicating the first liquid guide channel with the second liquid guide channel, and the second channel is used for communicating the second liquid guide channel with the second liquid guide channel. And the second channel is used for communicating the first liquid guide channel, the second liquid guide channel and the cleaning liquid filling channel. A mechanical structure simulating a three-way valve is adopted, the valve body is additionally arranged between the injector and the needle head, active closing and mechanical locking of the first liquid guide channel and the second liquid guide channel are achieved by rotating the rotating piece, the design replaces a traditional rubber plug manual push-in mode depending on the operation speed, timely sealing of blood after blood sampling is guaranteed, and the blood sampling efficiency is improved. And gas exchange errors caused by delay or vibration are avoided.

Description

Technical Field

[0001] This invention relates to the field of biomedical technology, and in particular to a switch valve for syringes that prevents blood accumulation. Background Technology

[0002] Arterial blood gas analysis is a core tool for clinically assessing a patient's respiratory function, acid-base balance, and electrolyte status. Its results have significant guiding value for intensive care, surgical anesthesia, and the treatment of chronic respiratory diseases. Currently, arterial blood gas analysis typically involves collecting blood from the patient before performing the analysis. After drawing arterial blood with a syringe, medical staff must immediately and quickly push the rubber stopper into the syringe to isolate the blood sample from outside air (because contact between oxygen or carbon dioxide and the blood sample will cause changes in the gas composition and pH value of the sample, ultimately leading to deviations in the test results).

[0003] However, this method has two major drawbacks: High operational dependence: The rubber stopper needs to be quickly sealed to the syringe after blood collection. If the medical staff delays the operation or their technique is unstable, air can easily get in, which will directly affect the detection accuracy of blood oxygen saturation and carbon dioxide partial pressure. Insufficient transport stability: The rubber stopper is only fixed inside the syringe by friction. If it falls off during transport due to bumps, tilting or accidental collision, the seal will fail and the sample will be quickly exposed to the air, causing data distortion. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a switch valve for a syringe that prevents blood accumulation.

[0005] The technical solution of the present invention is as follows: a syringe switch valve for preventing blood accumulation, comprising a valve body, wherein the valve body is provided with a first liquid guiding channel, a second liquid guiding channel and a cleaning fluid infusion channel, the first liquid guiding channel being used to connect to a needle, the valve body being provided with a sealing plug for controlling the opening and closing of the cleaning fluid infusion channel, the valve body being sealed and slidably connected to a rotating component, the rotating component being provided with a first channel and a second channel, the first channel being used to connect the first liquid guiding channel and the second liquid guiding channel, the second channel being used to connect the first liquid guiding channel, the second liquid guiding channel and the cleaning fluid infusion channel, when blood collection is not required, the rotating component rotates and blocks the connection between the first liquid guiding channel and the second liquid guiding channel, a connecting cylinder connected to the second liquid guiding channel is fixedly connected to the side of the valve body near the second liquid guiding channel, the connecting cylinder being used to connect to a syringe.

[0006] More preferably, the first liquid guiding channel, the second liquid guiding channel, and the cleaning fluid injection channel gradually slope downward from the side closer to the rotating member to the side farther away from the rotating member, and both the first channel and the second channel gradually slope downward from the side closer to the central axis of the rotating member to the outside.

[0007] More preferably, the cleaning fluid injection channel is located between the first fluid guiding channel and the second fluid guiding channel, and the angle between the cleaning fluid injection channel and the projection of the first fluid guiding channel and the second fluid guiding channel onto the horizontal plane is less than 90°.

[0008] More preferably, the first liquid guiding channel, the second liquid guiding channel, the cleaning fluid injection channel, the first channel, and the second channel are all coated with a hydrophilic and oleophobic composite coating.

[0009] More preferably, the valve body is rotatably connected with a limiting pin, and the rotating component is provided with annular recesses distributed in a linear array. When the limiting pin is engaged in the annular recesses, the rotating component is fixed.

[0010] More preferably, when the second channel is connected to the first liquid guiding channel, the second liquid guiding channel and the cleaning fluid injection channel, the first channel is exposed to the outside world to facilitate cleaning of the first channel.

[0011] More preferably, it further includes a fixing component for fixing the syringe. The fixing component is disposed on the side of the valve body near the connecting cylinder. The fixing component includes a connecting ring. The connecting ring is disposed on the side of the valve body near the connecting cylinder. The side of the connecting ring near the valve body is fixedly connected to a ring array of fixing members. The fixing members are slidably connected to a sliding frame. A first spring is disposed between the sliding frame and the fixing members. The sliding frame is fixedly connected to a first arc-shaped extrusion block.

[0012] More preferably, the side of the first arc-shaped extrusion block closest to the syringe is provided with an anti-slip rubber layer, which is used to increase the friction between the first arc-shaped extrusion block and the syringe.

[0013] More preferably, it further includes an adjusting component for adjusting the clamping force of all the first arc-shaped extrusion blocks. The adjusting component is disposed on the connecting ring. The adjusting component includes a rotating shell, which is threaded to the connecting ring. A connecting shell is fixedly connected to the side of the rotating shell away from the valve body. The connecting shell is rotatably connected to a second arc-shaped extrusion block distributed in a ring array. A torsion spring is fixedly connected between the second arc-shaped extrusion block and the connecting shell. All the second arc-shaped extrusion blocks together form a complete ring, and the ring is used to extrude all the sliding frames.

[0014] More preferably, the fixed members distributed in a ring array are slidably connected to a limiting ring for limiting all the second arc-shaped extrusion blocks. The limiting ring is located on the outside of the connecting shell, and a second spring is provided between the limiting ring and the rotating shell. The limiting ring is fixedly connected to a pressing rod.

[0015] The beneficial effects of this invention are: This invention adopts a mechanical structure that simulates a three-way valve, and adds a valve body between the syringe and the needle. By rotating the rotating part, the first liquid guiding channel and the second liquid guiding channel are actively closed and mechanically locked. This design replaces the traditional method of manually pushing in a rubber stopper that relies on operating speed, ensuring timely sealing of blood after blood collection and avoiding gas exchange errors caused by delay or vibration. By setting the shapes of the first fluid guiding channel, the second fluid guiding channel, the cleaning fluid injection channel, the first channel, and the second channel, and matching them with the coatings inside, the effect of reducing blood adhesion is achieved, thereby facilitating subsequent cleaning. When the syringe is connected to the valve body, the anti-slip rubber layer is made to fit the syringe by the opposite movement of all the first arc-shaped squeezing blocks, thereby increasing the fixing force on the syringe and keeping the syringe stable during blood collection. When it is necessary to disconnect the syringe from the valve body, all the first arc-shaped squeezing blocks are actively disengaged from the syringe by pressing the lever with one hand, thereby improving convenience. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a bottom view of the three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the valve body of the present invention; Figure 4 This is a three-dimensional sectional view of the valve body of the present invention; Figure 5 This is a three-dimensional structural diagram showing the shapes of the first and second channels of the present invention; Figure 6 This is a three-dimensional structural diagram of the sealing plug of the present invention; Figure 7 This is an exploded three-dimensional view of the rotating component, the first channel, and the second channel of the present invention. Figure 8 This is a three-dimensional structural diagram of the connecting ring and the fixing member of the present invention; Figure 9 This is a three-dimensional structural cross-sectional view of the limiting ring of the present invention; Figure 10 This is an exploded three-dimensional view of the rotating shell, connecting shell, and second arc-shaped extrusion block of the present invention.

[0017] The meanings of the reference numerals in the figure are as follows: 1: Valve body, 2: First fluid channel, 3: Second fluid channel, 4: Cleaning fluid injection channel, 5: Packer plug, 6: Rotating component, 7: First channel, 8: Second channel, 9: Limiting pin, 10: Annular recess, 11: Needle, 12: Connecting cylinder, 13: Syringe, 14: Connecting ring, 15: Fixing component, 16: Sliding frame, 17: First arc-shaped extrusion block, 18: Rotating shell, 19: Connecting shell, 20: Second arc-shaped extrusion block, 21: Limiting ring, 22: Pressing rod. Detailed Implementation

[0018] Although the invention may be described with respect to specific applications or industries, those skilled in the art will recognize its broader applicability. Those skilled in the art will appreciate that terms such as "above," "below," etc., are used to facilitate understanding of the accompanying drawings. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0019] To address the problems of high operational dependence and unreliable sealing caused by the reliance on manual sealing of syringe 13 and rubber stopper in traditional arterial blood gas analysis, this invention solves the above problems through the following design:

[0020] Example 1: A syringe switching valve to prevent blood accumulation, such as Figures 1-7 As shown, the device includes a valve body 1, which contains a first fluid guiding channel 2, a second fluid guiding channel 3, and a cleaning fluid infusion channel 4. The first fluid guiding channel 2 is used to connect to a needle 11. The valve body 1 is provided with a sealing plug 5 for controlling the opening and closing of the cleaning fluid infusion channel 4. The valve body 1 is sealed, rotates, and is slidably connected to a rotating component 6. The rotating component 6 contains a first channel 7 and a second channel 8. The first channel 7 is used to connect the first fluid guiding channel 2 and the second fluid guiding channel 3, and the second channel 8 is used to connect the first fluid guiding channel 2, the second fluid guiding channel 3, and the cleaning fluid infusion channel 4. When blood collection is not required, the rotating component 6 rotates and blocks the connection between the first fluid guiding channel 2 and the second fluid guiding channel 3. A connecting cylinder 12 connected to the second fluid guiding channel 3 is fixedly connected to the side of the valve body 1 near the second fluid guiding channel 3. The connecting cylinder 12 is used to connect to a syringe 13.

[0021] The above technical solution is achieved by adding a valve body 1 between the syringe 13 and the needle 11, which has a built-in simulated three-way valve mechanism, including a first liquid guiding channel 2 (connected to the needle 11) and a second liquid guiding channel 3 (connected to the syringe 13). During the blood collection stage, valve body 1 is initially in the conductive state, that is, the first liquid guiding channel 2, the first channel 7 and the second liquid guiding channel 3 are connected; During the blood collection stage, blood enters the syringe 13 sequentially through the needle 11, the first fluid channel 2, the first channel 7, and the second fluid channel 3. After blood collection, the rotating part 6 is rotated to physically close the connection between the first channel 7 and the second fluid channel 3, thereby improving the sealing performance and increasing the accuracy of the results while simplifying the operation.

[0022] like Figures 4-7 As shown, the first liquid guiding channel 2, the second liquid guiding channel 3, and the cleaning fluid injection channel 4 gradually slope downwards from the side closer to the rotating part 6 to the side farther away from the rotating part 6. The first channel 7 and the second channel 8 both gradually slope downwards from the side closer to the central axis of the rotating part 6 to the outside, so that the highest point in the middle is higher than the two end interfaces, promoting the drainage of liquid by gravity. The cleaning fluid injection channel 4 is located between the first liquid guiding channel 2 and the second liquid guiding channel 3, and the angle between the cleaning fluid injection channel 4 and the first liquid guiding channel 2 and the second liquid guiding channel 3 on the horizontal plane is less than 90°. The first liquid guiding channel 2, the second liquid guiding channel 3, the cleaning fluid injection channel 4, the first channel 7, and the second channel 8 are all coated with a hydrophilic and oleophobic composite coating to reduce the adhesion of liquids (such as blood and cleaning fluid). When the second channel 8 is connected to the first liquid guiding channel 2, the second liquid guiding channel 3, and the cleaning fluid injection channel 4, the first channel 7 is exposed to the outside world to facilitate the cleaning of the first channel 7.

[0023] The above technical solution achieves the following: When blood needs to be sent into the testing device, first establish the connection between the needle 11 and the testing device, then rotate the rotating part 6 in the opposite direction to connect the first liquid channel 2, the first channel 7 and the second liquid channel 3. Then, the medical staff pushes the syringe 13 so that the blood enters the testing device sequentially through the second liquid channel 3, the first channel 7, the first liquid channel 2 and the needle 11. Finally, the medical staff can disassemble the syringe 13 and the needle 11. After disassembling the two, the medical staff can lay the valve body 1 flat. The residual blood in the first liquid channel 2, the first channel 7 and the second liquid channel 3 falls freely due to gravity, reducing the adhesion of blood in the three and facilitating subsequent cleaning. When cleaning the inside of valve body 1, medical staff press down the rotating part 6 to connect the second channel 8 with the first fluid channel 2, the second fluid channel 3, and the cleaning fluid infusion channel 4 respectively (at this time, the first channel 7 is exposed). Then, the medical staff removes the sealing plug 5 and connects the cleaning tube to the cleaning fluid infusion channel 4. Then, the cleaning fluid is injected into the cleaning fluid infusion channel 4 through the cleaning tube. The cleaning fluid then enters the first fluid channel 2 and the second fluid channel 3 through the second channel 8, quickly flushing out the residual blood in the first fluid channel 2 and the second fluid channel 3. Then, the residual blood in the first channel 7 is quickly flushed out, thus cleaning the first fluid channel 2, the second fluid channel 3, and the first channel 7. After cleaning the above parts is completed, the medical staff can lay the valve body 1 flat. The residual cleaning fluid in the first fluid channel 2, the second fluid channel 3, and the first channel 7 falls freely under the action of gravity.

[0024] Example 2: Based on Example 1, a limiting device for the rotating component 6 is proposed, so that the rotating component 6 can only rotate on its own axis during the blood drawing process, such as... Figure 1 and Figure 3 As shown, the valve body 1 is rotatably connected to the limiting pin 9. There is friction between the limiting pin 9 and the valve body 1, so that the limiting pin 9 remains fixed without being subjected to external force. The rotating part 6 is provided with annular recesses 10 distributed in a linear array. When the limiting pin 9 is inserted into the annular recesses 10, the rotating part 6 is fixed.

[0025] The above technical solution achieves the following: During blood collection, the limiting pin 9 is manually rotated so that it engages in the annular recess 10 located on the lower side, so that the rotating part 6 can only rotate on its own. During the process of cleaning up residual blood, the limiting pin 9 is manually rotated so that it engages in the annular recess 10 located on the upper side, so that the relative position of the rotating part 6 and the valve body 1 will not change.

[0026] Example 3: Based on Example 1, a method for fixing the syringe 13 is proposed to ensure its stability during blood drawing, such as... Figures 4-10As shown, it also includes a fixing assembly for fixing the syringe 13. The fixing assembly is located on the front side of the valve body 1. The fixing assembly includes a connecting ring 14, which is located on the side of the valve body 1 near the connecting cylinder 12. Two fixing members 15 arranged in a ring array are fixedly connected to the rear side of the connecting ring 14 (the fixing member 15 includes an L-shaped frame fixedly connected to each other and a fixing pin with a T-shaped cross section). Sliding frames 16 are slidably connected to the front side of each of the two fixing members 15. A first spring is provided between the sliding frame 16 and the fixing member 15. A first arc-shaped extrusion block 17 is fixedly connected to the sliding frame 16. Through all the first arc-shaped extrusion blocks 17, the syringe 13 is fixedly connected to the first arc-shaped extrusion block 17. The opposing movement of 7 achieves clamping and fixing of syringe 13. The side of the first arc-shaped squeezing block 17 near syringe 13 is provided with an anti-slip rubber layer. This anti-slip rubber layer is used to increase the friction between the first arc-shaped squeezing block 17 and syringe 13. It also includes an adjustment component for adjusting the clamping force of all the first arc-shaped squeezing blocks 17. The adjustment component is provided on the connecting ring 14. The adjustment component includes a rotating shell 18, which is threaded to the connecting ring 14. A connecting shell 19 is fixedly connected to the side of the rotating shell 18 away from the valve body 1. The connecting shell 19 is rotatably connected to the second arc-shaped squeezing blocks 20 distributed in a ring array. A torsion spring is fixed between the second arc-shaped extrusion block 20 and the connecting shell 19. All the second arc-shaped extrusion blocks 20 together form a complete ring, which is used to extrude all the sliding frames 16. The fixed members 15 distributed in a ring array are slidably connected to a limiting ring 21 for limiting all the second arc-shaped extrusion blocks 20 (in the initial state, the limiting ring 21 extrudes all the second arc-shaped extrusion blocks 20). The limiting ring 21 is located on the outside of the connecting shell 19. When the limiting ring 21 contacts all the second arc-shaped extrusion blocks 20, the distance between the second arc-shaped extrusion blocks 20 and the connecting shell 19 is limited. When the torsion spring is in a charged state, and the limiting ring 21 is no longer in contact with all the second arc-shaped extrusion blocks 20, the torsion spring between the second arc-shaped extrusion block 20 and the connecting shell 19 is in a released state. At that time, all the second arc-shaped extrusion blocks 20 are in an outward swinging state, and in this state, the second arc-shaped extrusion blocks 20 are no longer in contact with the sliding frame 16. The limiting ring 21 is fixedly connected to the second spring, which is in contact with the rotating shell 18. The elastic coefficient of the second spring is greater than the elastic coefficient of the adjacent torsion spring of the second arc-shaped extrusion block 20. A second spring is provided between the limiting ring 21 and the rotating shell 18, and the limiting ring 21 is fixedly connected to the pressing rod 22.

[0027] The above technical solution is implemented as follows: Before blood collection, medical staff insert the connecting ring 14 into the valve body 1 (this assembly method is the same as the existing one, which is to insert the connecting ring 14 into the valve body 1 by pressing and turning, similar to the connection between existing buckles), and then insert the head of the syringe 13 into the connecting tube 12 to complete the connection between the syringe 13 and the connecting tube 12. At this time, all the first arc-shaped extrusion blocks 17 are located on the outside of the syringe 13. Through the above, the installation of the connecting ring 14 and its parts is completed.

[0028] Subsequently, medical personnel rotate the rotating shell 18, causing it to drive all the second arc-shaped extrusion blocks 20 to rotate synchronously via the connecting shell 19. During the rotation, the rotating shell 18 moves forward along the thread on the connecting ring 14 (during this process, the limiting ring 21 restricts all the second arc-shaped extrusion blocks 20). All the second arc-shaped extrusion blocks 20 move and rotate with the rotating shell 18, thereby extruding all the sliding frames 16. This causes the sliding frames 16 to drive the adjacent first arc-shaped extrusion blocks 17 to move along the adjacent fixing members 15 (during the movement of the sliding frames 16, the adjacent first springs are extruded), shortening the distance between the first arc-shaped extrusion blocks 17 and the syringe 13. During the movement, the rotating shell 18 contacts the second spring (the connecting shell 19 rotates relative to the second spring during the movement), thereby driving the limiting ring 21 to move synchronously.

[0029] As the rotating shell 18 gradually rotates, all the second arc-shaped extrusion blocks 20 continue to extrude pressure on all the sliding frames 16, causing the anti-slip rubber layers on the opposite sides of all the first arc-shaped extrusion blocks 17 to adhere to the outer side of the syringe 13. During this process, the anti-slip rubber layers increase the friction between the first arc-shaped extrusion blocks 17 and the syringe 13, thereby increasing the fixing force on the syringe 13 and keeping the syringe 13 stable during blood collection.

[0030] When blood collection is completed and the blood is delivered to the testing equipment, the syringe 13 is released from its fixation by one hand by quickly disconnecting it from all the first arc-shaped compression blocks 17. Details are as follows: Medical staff press the press lever 22, which moves the limiting ring 21 away from the syringe 13. During the movement of the limiting ring 21, the second spring is squeezed and no longer blocks all the second arc-shaped squeezing blocks 20. All the second arc-shaped squeezing blocks 20 expand outward under the action of the torsion spring. After all the second arc-shaped squeezing blocks 20 expand outward, they no longer contact all the sliding frames 16. At this point, the squeezing of all the sliding frames 16 is released. Under the action of the adjacent first spring, all the sliding frames 16 drive the corresponding first arc-shaped squeezing blocks 17 to reset one after another. After all the first arc-shaped squeezing blocks 17 reset, they no longer fix the syringe 13. Then the medical staff can pull out the syringe 13. During the subsequent cleaning of the valve body 1, the medical staff first remove the connecting ring 14 and related parts from the valve body 1 to prevent the cleaning fluid or residual blood from splashing onto the connecting ring 14 and related parts when cleaning the parts inside the valve body 1.

[0031] After removing the connecting ring 14, the medical staff rotated the rotating shell 18 in the opposite direction, causing the rotating shell 18 to move and reset its components. Under the action of the second spring, the limiting ring 21 moved back to the side closer to the second arc-shaped pressing block 20, and pressed all the second arc-shaped pressing blocks 20 back into place. Figure 8The state in.

[0032] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A syringe switching valve for preventing blood accumulation, characterized in that, The device includes a valve body (1), which has a first liquid guiding channel (2), a second liquid guiding channel (3), and a cleaning fluid injection channel (4). The first liquid guiding channel (2) is used to connect to a needle (11). The valve body (1) is provided with a sealing plug (5) for controlling the opening and closing of the cleaning fluid injection channel (4). The valve body (1) is sealed and slidably connected to a rotating component (6). The rotating component (6) has a first channel (7) and a second channel (8). The first channel (7) is used to channel the first liquid guiding channel (2). The second channel (8) is connected to the second liquid channel (3). The second channel (8) is used to connect the first liquid channel (2), the second liquid channel (3) and the cleaning fluid infusion channel (4). When blood collection is not required, the rotating part (6) rotates and blocks the connection between the first liquid channel (2) and the second liquid channel (3). The valve body (1) is fixedly connected to a connecting cylinder (12) connected to the second liquid channel (3) on the side near the second liquid channel (3). The connecting cylinder (12) is used to dock with the syringe (13).

2. The syringe switching valve for preventing blood accumulation according to claim 1, characterized in that, The first liquid guiding channel (2), the second liquid guiding channel (3) and the cleaning fluid injection channel (4) gradually slope downward from the side close to the rotating part (6) to the side away from the rotating part (6), and the first channel (7) and the second channel (8) gradually slope downward from the side close to the central axis of the rotating part (6) to the outside.

3. A syringe switching valve for preventing blood accumulation according to claim 2, characterized in that, The cleaning fluid injection channel (4) is located between the first fluid guiding channel (2) and the second fluid guiding channel (3), and the angle between the cleaning fluid injection channel (4) and the first fluid guiding channel (2) and the second fluid guiding channel (3) on the horizontal plane is less than 90°.

4. A syringe switching valve for preventing blood accumulation according to claim 3, characterized in that, The first liquid guiding channel (2), the second liquid guiding channel (3), the cleaning fluid injection channel (4), the first channel (7) and the second channel (8) are all coated with a hydrophilic and oleophobic composite coating.

5. A syringe switching valve for preventing blood accumulation according to claim 1, characterized in that, The valve body (1) is rotatably connected to a limiting pin (9), and the rotating part (6) is provided with annular recesses (10) arranged in a linear array. When the limiting pin (9) is inserted into the annular recesses (10), the rotating part (6) is fixed.

6. A syringe switching valve for preventing blood accumulation according to claim 4, characterized in that, When the second channel (8) is connected to the first liquid guiding channel (2), the second liquid guiding channel (3) and the cleaning fluid injection channel (4), the first channel (7) is exposed to the outside world so as to facilitate the cleaning of the first channel (7).

7. A syringe switching valve for preventing blood accumulation according to claim 1, characterized in that, It also includes a fixing component for fixing the syringe (13), the fixing component is disposed on the side of the valve body (1) near the connecting cylinder (12), the fixing component includes a connecting ring (14), the connecting ring (14) is disposed on the side of the valve body (1) near the connecting cylinder (12), the connecting ring (14) is fixedly connected to a ring array of fixing members (15) on the side of the connecting ring (14) near the valve body (1), the fixing members (15) are slidably connected to a sliding frame (16), a first spring is disposed between the sliding frame (16) and the fixing members (15), and a first arc-shaped extrusion block (17) is fixedly connected to the sliding frame (16).

8. A syringe switching valve for preventing blood accumulation according to claim 7, characterized in that, The first arc-shaped extrusion block (17) is provided with an anti-slip rubber layer on the side near the syringe (13). This anti-slip rubber layer is used to increase the friction between the first arc-shaped extrusion block (17) and the syringe (13).

9. A syringe switching valve for preventing blood accumulation according to claim 7, characterized in that, It also includes an adjustment component for adjusting the clamping force of all the first arc-shaped extrusion blocks (17). The adjustment component is disposed on the connecting ring (14). The adjustment component includes a rotating shell (18). The rotating shell (18) is threaded to the connecting ring (14). A connecting shell (19) is fixedly connected to the side of the rotating shell (18) away from the valve body (1). The connecting shell (19) is rotatably connected to a second arc-shaped extrusion block (20) distributed in a ring array. A torsion spring is fixedly connected between the second arc-shaped extrusion block (20) and the connecting shell (19). All the second arc-shaped extrusion blocks (20) together form a complete ring, and the ring is used to extrude all the sliding frames (16).

10. A syringe switching valve for preventing blood accumulation according to claim 9, characterized in that, The fixed members (15) distributed in a ring array are slidably connected to a limiting ring (21) for limiting all the second arc-shaped extrusion blocks (20). The limiting ring (21) is located outside the connecting shell (19). A second spring is provided between the limiting ring (21) and the rotating shell (18). The limiting ring (21) is fixedly connected to a pressing rod (22).

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