Auxiliary device for blood transfusion and transfusion

Abstract

The invention discloses an auxiliary device for blood transfusion and infusion, and belongs to the technical field of medical instruments. Comprising a body which is provided with a second connector connected with an injector and a first connector connected with a retention needle. The third connector is arranged on the main body, the third connector is connected with a collecting test tube, and the pumped-back liquid is collected through the collecting test tube; the rotating rod is rotationally arranged in the main body, a first torsional spring is connected between the rotating rod and the inner wall of the main body, a pumpback barrel close to one side of the first connector is rotationally arranged in the main body, and the rotating rod is fixedly connected with the pumpback barrel; and an inner cavity is formed in the pumpback cylinder. The auxiliary device for blood transfusion and transfusion has the beneficial effects that by arranging the withdrawing cylinder and the sliding baffle, liquid in a retention needle can be withdrawn through the connecting port, the withdrawn liquid is discharged into the collecting test tube through the first through port, whether thrombus exists or not can be observed, and the withdrawn liquid can be collected.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an auxiliary device for blood transfusion and infusion. Background Art

[0002] During the medical process, patients usually need to receive blood transfusion and infusion treatment. When long-term blood transfusion and infusion are required, an infusion port and an indwelling needle are usually implanted in the patient's hand vein to avoid repeated needle insertion. However, since the indwelling needle stays in the human body for a long time, blood may coagulate in the needle tube, causing blockage of the needle tube. Therefore, the indwelling needle needs to be repeatedly pulse-flushed with normal saline before infusion and blood transfusion. However, blood coagulation forms a thrombus. Before infusion, a backdraw treatment is performed, that is, backdrawing is performed through a syringe to avoid the thrombus being directly flushed into the blood vessel and causing danger. The current method generally uses medical staff to backdraw with a syringe and then pulse-flushed the indwelling needle. Medical staff need to have skilled techniques to ensure the flushing strength. If a thrombus appears during the backdraw, the syringe needs to be replaced and the tube flushed again. The requirements for the operator are high and the operation is also relatively complicated.

[0003] Therefore, there is a need for an auxiliary device for blood transfusion and infusion to solve the above problems. Summary of the Invention

[0004] The content of this application is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this application is not intended to identify key features or essential features of the technical solution for which protection is sought, nor is it intended to limit the scope of the technical solution for which protection is sought.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide an auxiliary device for blood transfusion and infusion, including: a main body, a second interface for connecting a syringe, and a first interface for connecting a retention needle are provided on the main body; a third interface is provided on the main body, the third interface is connected to a collection tube, and the withdrawn liquid is collected through the collection tube; a flushing component, a withdrawal component, and a connecting component are provided in the main body; the connecting component includes: a rotating rod rotatably provided in the main body, a first torsion spring is connected between the rotating rod and the inner wall of the main body, a withdrawal cylinder rotatably provided in the main body near the first interface, and the rotating rod is fixedly connected to the withdrawal cylinder; an inner cavity is provided in the withdrawal cylinder, a rotating rod is rotatably provided in the withdrawal cylinder, one end of the rotating rod passes through the withdrawal cylinder and is connected to the inner wall of the main body with a second torsion spring, the rotating rod is fixedly connected to a sliding baffle slidably provided in the withdrawal cylinder, and a fixed baffle is fixedly provided in the withdrawal cylinder.

[0006] Furthermore, the fixed baffle separates the inner cavity of the withdrawal cylinder into a first part and a second part that are not connected to each other, the sliding baffle is slidably arranged in the first part and divides the first part into two areas that are not connected to each other, and a first port and a second port that are connected to the first part are opened on the side wall of the withdrawal cylinder. The withdrawal cylinder is rotated so that the first port is located at the third interface position and is connected to the third interface, or the second port is located at the third interface position and is connected to the third interface, or neither the first port nor the second port is connected to the third interface. An opening that is connected to the first part is opened on the side end wall of the main body close to the first interface, and a through pipe is provided in the second part of the withdrawal cylinder, and both ends of the through pipe extend to the two end surfaces of the withdrawal cylinder respectively and form openings on the two end surfaces of the withdrawal cylinder. The withdrawal cylinder is rotated so that the opening of the through pipe is connected to the first interface position facing the first interface or the connecting port is connected to the first interface position facing the first interface position.

[0007] The withdrawal cylinder and the sliding baffle are provided, and the withdrawal cylinder is rotated so that the withdrawal cylinder has a first position and a second position. When the withdrawal cylinder is in the first position, the first opening is connected to the third interface and the third interface is directly opposite the third interface, and the through tube is directly opposite the first interface. When the withdrawal cylinder is rotated from the first position to the second position, the second opening is rotated to the third interface and connected to the third interface, and the connecting port is rotated to the first interface position and connected to the first interface. When the withdrawal cylinder is rotated from the first position to the second position, the sliding baffle is reversed under the action of the second torsion spring, and the liquid in the retained needle can be withdrawn into the first part of the withdrawal cylinder through the connecting port. When the withdrawal cylinder is reset, the withdrawn liquid is discharged into the collection tube through the first opening, so that the presence of thrombus can be observed.

[0008] Furthermore, a limit pin is slidably provided on the sliding baffle, a second spring is connected between the limit pin and the sliding baffle, a pin hole is provided on the inner wall of the retraction cylinder for embedding one end of the limit pin, a pushing head is slidably connected in the pin hole, and an abutment protrusion for pushing the pushing head is fixedly provided on the inner wall of the main body, so that the pushing head pushes the limit pin away from the pin hole.

[0009] By means of the limit pin and the push head, when the withdrawal cylinder rotates from the first position to the second position, the sliding baffle rotates therewith under the action of the limit pin. When the withdrawal cylinder reaches the second position, the limit pin is pushed away from the pin hole through the push head under the action of the abutment protrusion, and then the sliding baffle is reset under the action of the second torsion spring. At this time, the liquid retained in the needle can be withdrawn into the withdrawal cylinder.

[0010] Furthermore, the flushing assembly includes a rotating disk rotatably arranged in the main body, the rotating disk is located on the side close to the second interface, the outer edge of the rotating disk is attached to the inner wall of the main body, and the rotating disk and the inner wall of the main body cooperate to form a first cavity close to the second interface, and a mounting column is fixedly arranged on the rotating disk, one end of the mounting column is rotatably connected to the inner wall of the main body, and a sliding plate in the first cavity is fixedly arranged between the mounting column and the rotating disk.

[0011] By setting the rotating disk and sliding plate, when physiological saline is injected into the main body through the syringe and the second interface, the rotating disk and the mounting column rotate under the action of the sliding plate, thereby driving the rotating rod to rotate until the sliding plate moves to the limit position.

[0012] Furthermore, a fixed plate located in the first cavity is fixedly installed in the main body, and the fixed plate cooperates with the sliding plate to separate the first cavity into two parts. The opening formed by the second interface on the inner wall of the first cavity is located in the first part, and a breathable water stop valve connected to the second part is installed on the main body.

[0013] The physiological saline injected by the syringe is located in the first part, and the gas in the second part is discharged through the breathable water stop valve.

[0014] Furthermore, a fixing ring is fixedly connected to the inner wall of the main body, the fixing ring is embedded in the mounting column, a sliding bar is slidably connected in the mounting column, a first spring is connected between the sliding bar and the mounting column, an abutment is fixedly connected to the rotating rod, one end of the sliding bar abuts against the abutment, the end face of the fixing ring is a wall surface extending spirally around the axis and contacts the sliding bar, when the mounting column rotates, the end face of the fixing ring pushes the sliding bar so that the sliding bar finally disengages from the abutment.

[0015] The fixed ring and the sliding bar are provided. When the mounting post rotates, the sliding bar and the abutment portion act to drive the rotating rod to rotate, which in turn drives the withdrawal cylinder to rotate. When the withdrawal cylinder rotates from the first position to the second position, the liquid in the retained needle is withdrawn into the first portion of the withdrawal cylinder. The fixed ring pushes the sliding bar away from the first spring, causing the rotating rod and the withdrawal cylinder to return to the first position under the action of the first torsion spring. It should be noted that the sliding bar is configured as a hinged rod structure at one end where it contacts the abutment portion, which can drive the rotating rod to rotate in one direction.

[0016] Furthermore, a support plate is fixedly provided in the main body, a connecting cylinder coaxial with the first interface is provided on the support plate, a through hole is provided on the rotating disk, and the through hole and the connecting cylinder are made coaxial by rotating the rotating disk.

[0017] Furthermore, the retraction assembly includes: a rotating cylinder located between the support plate and the rotating disk is rotatably connected in the main body, a connecting tube is provided on the rotating cylinder, and the connecting tube is connected to the through hole and the connecting cylinder by rotating the rotating cylinder. A mounting groove connected to the first cavity is opened in the main body, a pressure plate is slidably connected in the mounting groove, and the sliding trajectory of the pressure plate rotates around the main body. A connecting spring is connected between the pressure plate and the inner wall of the mounting groove, and the mounting groove has a rod portion fixed to the rotating cylinder.

[0018] Through the provided rotating cylinder and pressure plate, when physiological saline is injected into the first cavity and the rotating disk is in the limit state, continued injection increases the pressure in the first cavity, thereby driving the pressure plate to move and driving the rotating cylinder to move. When the rotating disk is in the limit state, the through hole and the connecting cylinder are coaxial, and the rotating cylinder is rotated to the coaxial position of the connecting tube and the through hole, so that the through hole and the connecting cylinder are connected, so that the physiological saline in the first cavity passes through the connecting tube, the connecting cylinder and the through tube and then is injected into the retention needle through the first interface to flush the tube. When the through hole and the connecting cylinder are connected, the pressure in the first cavity drops, so that the pressure plate is reset under the action of the connecting spring, and the through hole and the connecting cylinder are continued to be separated at this time until the pressure in the first cavity pushes the pressure plate to move again so that the connecting tube is connected with the through hole and the connecting cylinder, so as to repeatedly perform pulsating flushing, which not only ensures the flushing strength but also can realize pulsating flushing.

[0019] The beneficial effects of this application are:

[0020] 1. By means of the withdrawal cylinder and the sliding baffle, the liquid in the retained needle can be withdrawn into the first part of the withdrawal cylinder through the connecting port. When the withdrawal cylinder is reset, the withdrawn liquid is discharged into the collection tube through the first port, so that the presence of thrombus can be observed.

[0021] 2. Through the provided rotating cylinder and pressure plate, after a certain pressure is reached in the first cavity, the physiological saline in the first cavity passes through the connecting tube, the connecting cylinder and the through tube and then is injected into the retention needle through the first interface to flush the tube, thereby ensuring the flushing force.

[0022] 3. When the through hole is connected to the connecting tube, the pressure in the first chamber drops, causing the pressure plate to reset under the action of the connecting spring until the pressure in the first chamber pushes the pressure plate to move again so that the connecting pipe is connected to the through hole and the connecting tube, thereby repeatedly performing pulsating flushing.

[0023] 4. Use a syringe to inject normal saline, which can complete the withdrawal and flushing operations without changing the syringe, while preventing the withdrawn liquid from re-entering the retention needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0025] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the elements and components are not necessarily drawn to scale.

[0026] In the attached figure:

[0027] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0028] Figure 2 yes Figure 1 A schematic diagram of the internal structure of the main body in the embodiment;

[0029] Figure 3 yes Figure 1 A schematic diagram of the installation of the rotating disk in the embodiment;

[0030] Figure 4 yes Figure 1 A schematic diagram of the installation of the mounting column in the embodiment;

[0031] Figure 5 yes Figure 1 A schematic diagram of the rotation direction of the withdrawal cylinder from the first position to the second position in the embodiment;

[0032] Figure 6 yes Figure 1 A schematic diagram of the internal structure of the retraction cylinder in the embodiment;

[0033] Figure 7 yes Figure 1 A schematic diagram of the installation of the sliding baffle in the embodiment;

[0034] Figure 8 yes Figure 7 A partial enlarged schematic diagram of point A in the embodiment;

[0035] Figure 9 yes Figure 1 Schematic diagram of the installation of the rotating drum in the embodiment.

[0036] Reference numerals:

[0037] 10. Main body; 11. Retention needle; 12. First interface; 13. Syringe; 14. Second interface; 15. Third interface; 16. Collection tube; 17. Flushing assembly; 18. Withdrawal assembly; 19. Connecting assembly; 20. Rotating disk; 21. Sliding plate; 22. Mounting column; 23. Fixed plate; 24. Air-permeable water-stop valve; 25. Rotating rod; 26. Abutment portion; 27. Sliding bar; 28. First spring; 29. ​​Fixed ring; 30. First torsion spring; 31. Withdrawal cylinder; 32. First opening; 33, second opening; 34, sliding baffle; 35, through pipe; 36, second torsion spring; 37, fixed baffle; 38, limit pin; 39, pushing head; 40, second spring; 41, abutment protrusion; 42, pressure plate; 43, connecting spring; 44, rotating cylinder; 45, connecting pipe; 46, support plate; 47, connecting cylinder; 48, through hole; 49, mounting groove; 50, air-permeable water-blocking pipe; 51, rotating rod; 52, connecting port; 53, first cavity; 54, hinged part. DETAILED DESCRIPTION

[0038] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0039] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0040] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0041] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0042] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0043] Reference Figure 1-9An auxiliary device for blood transfusion and infusion, comprising: a main body 10, a syringe 13, a second interface 14, a retention needle 11, a first interface 12, a third interface 15, a collection tube 16, a flushing assembly 17, a withdrawal assembly 18, a connecting assembly 19, a rotating rod 25, a first torsion spring 30, a withdrawal cylinder 31, a rotating rod 51, a second torsion spring 36, a sliding baffle 34, and a fixed baffle 37. Before infusing or transfusing blood through the retention needle 11, it is necessary to withdraw and flush the tube through the syringe to prevent the coagulated thrombus in the retention needle 11 from entering the blood vessel and to ensure that the retention needle 11 is unobstructed. By setting the main body 10, a second interface 14 for connecting to the syringe 13 and a first interface 12 for connecting to the retention needle 11 are provided on the main body 10. The syringe 13, the collection tube 16, and the retention needle 11 are all existing technologies, and the connection method can also refer to the existing connection method.

[0044] Before performing an infusion or blood transfusion, normal saline is injected into the main body 10 via a syringe 13. The saline then flows into the retention needle 11 through the first port 12. To prevent withdrawn fluid from re-injecting it into the retention needle 11, a third port 15 is provided on the main body 10. This port connects to a collection tube 16, to which a breathable, water-blocking tube 50 is attached. This tube 50 can be modeled after the air tube on a conventional infusion tube. This allows air within the collection tube 16 to escape through the tube when withdrawn fluid enters, ensuring pressure balance.

[0045] In order to achieve backdrawing before injecting normal saline, a backdrawing cylinder 31 is rotatably provided in the main body 10. The backdrawing cylinder 31 is a cylindrical shell structure with a cavity provided therein. The backdrawing cylinder 31 is located on a side close to the first interface 12. A rotating rod 51 is rotatably provided in the backdrawing cylinder 31. The rotating rod 51 is fixedly connected to a sliding baffle 34. The sliding baffle 34 is slidably sealed with the inner wall of the backdrawing cylinder 31. The sliding baffle 34 has an arc plate portion that fits the arc-shaped inner wall of the backdrawing cylinder 31, a side plate portion that fits the planar inner wall of the sliding baffle 34, and a main body portion fixed to the side plate portion of the arc plate portion. A fixed baffle 37 is fixedly connected in the backdrawing cylinder 31. The fixed baffle 37 divides the inner cavity of the backdrawing cylinder 31 into a first part and a second part that are not connected to each other. The sliding baffle 34 is slidably provided in the first part, and the sliding baffle 34 divides the first part into two non-connected areas.

[0046] A first opening 32 and a second opening 33 are provided on the annular side wall of the withdrawal cylinder 31. Both the first opening 32 and the second opening 33 are slidably sealed against the inner wall of the main body 10. The second opening 33 and the first opening 32 are both located in the first partial area. By rotating the withdrawal cylinder 31, the first opening 32 is aligned with and connected to the third interface 15, or the second opening 33 is aligned with or connected to the third interface 15. At the same time, a connecting port 52 is provided on the end wall of the withdrawal cylinder 31 near the first interface 12. The connecting port 52 is connected to the first part of the withdrawal cylinder 31. A through pipe 35 fixed to the withdrawal cylinder 31 is also provided in the second part of the withdrawal cylinder 31. Both ends of the through pipe 35 extend to the two side end surfaces of the withdrawal cylinder 31 and form openings. The opening of the through pipe 35 and the first cavity 53 are slidably sealed against the inner wall of the main body 10. The two ends of the connecting cylinder 47 are slidably sealed against the end wall of the withdrawal cylinder 31 and the end wall of the rotating cylinder 44, respectively.

[0047] The withdrawal cylinder 31 rotates between a first position and a second position. When in the first position, the passage 35 faces and connects to the first interface 12. When the withdrawal cylinder 31 rotates to the second position, the connection port 52 faces and connects to the first interface 12, allowing the liquid in the retained needle 11 to be withdrawn into the first portion of the withdrawal cylinder 31. When the withdrawal cylinder 31 is in the first position, the first opening 32 faces and connects to the third interface 15. When the withdrawal cylinder 31 is in the second position, the second opening 33 faces and connects to the third interface 15. When the withdrawal cylinder 31 is in the first position, the arc portion of the sliding baffle 34 blocks the first opening 32, and the side plate portion of the sliding baffle 34 blocks the connection port 52.

[0048] To draw the liquid in the retained needle 11 back into the withdrawal cylinder 31 and discharge it into the collection tube 16, one end of a rotating rod 51 passes through the withdrawal cylinder 31. One end of the rotating rod 51 rotatably engages with the inner wall of the main body 10 and is connected to a second torsion spring 36. The two ends of the second torsion spring 36 are respectively fixed to the rotating rod 51 and the inner wall of the main body 10. A limit pin 38 is slidably mounted on the sliding baffle 34. A second spring 40 is connected between the limit pin 38 and the sliding baffle 34. The two ends of the second spring 40 are respectively fixed to the limit pin 38 and the sliding baffle 34. A pin hole for the limit pin 38 is provided on the inner wall of the withdrawal cylinder 31. A push head 39 is slidably mounted on the withdrawal cylinder 31. An abutment protrusion 41 for pushing the push head 39 is fixed to the inner wall of the main body 10.

[0049] Specifically, when the withdrawal cylinder 31 rotates from the first position to the second position, the sliding baffle 34 will be driven to move synchronously under the action of the limit pin 38, and then the second torsion spring 36 will be twisted. When the withdrawal cylinder 31 moves to the second position, the abutment protrusion 41 abuts against the pushing head 39, so that the pushing head 39 pushes the limit pin 38 out of the pin hole, and then the sliding baffle 34 is reset under the action of the second torsion spring 36. At this time, negative pressure will be formed in the first part of the withdrawal cylinder 31, and at this time the connecting port 52 is opposite to and connected to the first interface 12, and the liquid in the retained needle 11 can be withdrawn into the first part of the withdrawal cylinder 31 through the first interface 12 to complete the withdrawal operation, and because the second opening 33 is opposite to and connected to the third interface 15 at this time, the gas in the first part of the withdrawal cylinder 31 can be discharged into the collection tube 16, ensuring that the air pressure balance does not hinder the movement of the sliding baffle 34.

[0050] In order to facilitate the discharge of the withdrawn liquid in the withdrawal cylinder 31 into the collection tube 16, after the liquid in the retention needle 11 is withdrawn into the withdrawal cylinder 31, the withdrawal cylinder 31 returns to the first position from the second position. At this time, due to the presence of the withdrawn liquid, the sliding baffle 34 and the withdrawal cylinder 31 are relatively stationary. At this time, the second torsion spring 36 will be twisted in the reverse direction until the withdrawal cylinder 31 returns to the first position. At this time, the first opening 32 is again aligned with and connected to the third interface 15. At this time, under the action of the second torsion spring 36, the sliding baffle 34 returns to the initial position, and then the withdrawn liquid in the first part of the withdrawal cylinder 31 is discharged into the collection tube 16 through the first opening 32, completing the collection of the withdrawn liquid.

[0051] When the withdrawal cylinder 31 reaches the first position, the through tube 35 faces the first interface 12 and is connected to the first interface 12. A support plate 46 is fixed in the main body 10, and a connecting tube 47 is fixed on the support plate 46. When the withdrawal cylinder 31 is in the first position, the connecting tube 47 faces the opening formed by the through tube 35 at the end surface of the withdrawal cylinder 31.

[0052] In order to achieve a backflow operation before the syringe 13 injects saline, a rotating disk 20 is rotatably provided in the main body 10. A mounting post 22 rotatably connected to the rotating disk 20 is fixedly connected to the main body 10. The rotating disk 20 is provided on a side of the main body 10 near the second interface 14. The rotating disk 20 and the inner wall of the main body 10 form a first cavity 53 near the second interface 14. A sliding plate 21 is fixed on the mounting post 22 and the rotating disk 20. A fixed plate 23 is fixed in the first cavity 53. The fixed plate 23 cooperates with the sliding plate 21 to separate the first cavity 53 into two mutually unconnected parts, wherein the second interface 14 is located in one part and is located between the fixed plate 23 and the sliding plate 21. A breathable water-stop valve 24 is provided at another part of the main body 10. The breathable water-stop valve 24 discharges the air in the first cavity 53.

[0053] When syringe 13 injects saline through second port 14, the saline pushes sliding plate 21 and rotating disk 20 to rotate, causing air in first chamber 53 to be expelled through air-permeable water-stop valve 24. Mounting post 22 is sleeved onto rotating rod 25. A sliding bar 27 is slidably mounted on mounting post 22. An abutment 26 is fixedly mounted on the sidewall of rotating rod 25. When mounting post 22 rotates, the sliding bar 27 and abutment 26 drive the rotating rod 25 to rotate. A first torsion spring 30 is connected between rotating rod 25 and main body 10, with its ends fixed to rotating rod 25 and main body 10, respectively. A fixing ring 29 is fixed to the inner wall of main body 10, and a groove is defined on mounting post 22 for retaining ring 29. A first spring 28 is connected between sliding bar 27 and mounting post 22, with its ends fixed to sliding bar 27 and mounting post 22, respectively.

[0054] The end face of the fixed ring 29 is a spirally extended surface and abuts against the sliding bar 27. When the mounting column 22 drives the rotating rod 25 to rotate a certain angle, the fixed ring 29 will push the sliding bar 27 to disengage from the abutment portion 26, so that the rotating rod 25 is reset under the action of the first torsion spring 30, and then drive the retraction cylinder 31 to reset.

[0055] It should be noted that the sliding bar 27 has a hinge portion 54 that abuts against the abutment portion 26, so that the sliding bar 27 can limit the abutment portion 26 in one direction, pushing the rotating rod 25 to rotate in one direction. When the mounting column 22 is reset, the abutment portion 26 will not block the sliding bar 27.

[0056] A through hole 48 is provided on the rotating disk 20, and the through hole 48 is slidably sealed with the end wall of the rotating cylinder 44. At the same time, a rotating cylinder 44 is provided between the support plate 46 and the rotating disk 20. The rotating cylinder 44 is rotatably provided in the main body 10. A connecting pipe 45 is fixedly provided on the rotating cylinder 44. The two ends of the connecting pipe 45 form openings at both end surfaces of the rotating cylinder 44. The connecting pipe 45 can be coaxially connected to the through hole 48 and the connecting cylinder 47 by rotating. A mounting groove 49 is provided in the main body 10 and is connected to the first cavity 53. A pressure plate 42 is slidably provided in the mounting groove 49, and a connecting spring 43 is provided between the pressure plate 42 and the end wall of the mounting groove 49. It should be noted that a ventilation and water-blocking valve connected to the outside world is also provided in the mounting groove 49 to balance the air pressure in the mounting groove 49.

[0057] When physiological saline is injected into the first cavity 53, the pressure plate 42 is driven to move under the action of pressure. The pressure plate 42 has a rod portion with one end fixed to the rotating cylinder 44. When the pressure plate 42 moves, the rotating cylinder 44 moves synchronously, and the sliding track of the pressure plate 42 rotates around the main body 10. When physiological saline is injected into the first cavity 53, the sliding plate 21 will move to the extreme position. At this time, the through hole 48 is coaxial with the first interface 12. Continuing to inject physiological saline will drive the pressure plate 42 and the rotating cylinder 44 to move, and then the connecting tube 45 will move to a coaxial position with the first interface 12. At this time, the through hole 48 is connected to the first interface 12 through the connecting tube 45, the connecting cylinder 47, and the through tube 35, and the physiological saline can be injected through the retention needle 11.

[0058] When the physiological saline is injected into the first chamber 53 and the rotating disk 20 is in the limit state, continued injection increases the pressure in the first chamber 53, thereby driving the pressure plate 42 to move and driving the rotating cylinder 44 to move. When the rotating disk 20 is in the limit state, the through hole 48 and the connecting cylinder 47 are coaxial, and the rotating cylinder 44 rotates to the coaxial position of the connecting tube 45 and the through hole 48, so that the through hole 48 and the connecting cylinder 47 are connected, so that the physiological saline in the first chamber 53 passes through the connecting tube 45, the connecting cylinder 47 and the through tube 35 and is injected into the retention needle 11 through the first interface 12 for flushing. When the through hole 48 is connected with the connecting cylinder 47, the pressure in the first chamber 53 drops, so that the pressure plate 42 is reset under the action of the connecting spring 43. At this time, the through hole 48 and the connecting cylinder 47 are continued to be separated until the pressure in the first chamber 53 pushes the pressure plate 42 to move again so that the connecting tube 45 is connected with the through hole 48 and the connecting cylinder 47, thereby repeatedly performing pulsating flushing, which not only ensures the flushing intensity but also can achieve pulsating flushing.

[0059] Working or installation process: In the initial state, the withdrawal cylinder 31 is located at the first position, and the connecting pipe 45 is not coaxial with the first interface 12.

[0060] 1. Physiological saline is injected into the main body 10 through the syringe 13. The physiological saline is located in the first chamber 53, which in turn drives the rotating disk 20 to rotate, causing the sliding plate 21 to rotate toward the limit state. When the mounting column 22 rotates, it drives the rotating rod 25 to rotate, and then drives the withdrawal cylinder 31 to move from the first position to the second position. When the withdrawal cylinder 31 moves to the second position, the sliding baffle 34 is driven to move synchronously under the action of the limit pin 38, thereby causing the second torsion spring 36 to twist. When the withdrawal cylinder 31 moves to the second position, the abutting protrusion 41 abuts against the pushing head 39, causing the pushing head to 39 pushes the limit pin 38 out of the pin hole, and then the sliding baffle 34 is reset under the action of the second torsion spring 36. At this time, negative pressure will be formed in the first part of the withdrawal cylinder 31, and the connecting port 52 is opposite to and connected with the first interface 12. The liquid in the retention needle 11 can be withdrawn into the first part of the withdrawal cylinder 31 through the first interface 12 to complete the withdrawal operation. Moreover, since the second opening 33 is opposite to and connected to the third interface 15 at this time, the gas in the first part of the withdrawal cylinder 31 can be discharged into the collecting tube 16 to ensure that the air pressure balance does not hinder the movement of the sliding baffle 34. Then, the fixing ring 29 will push the sliding bar 27 to disengage from the abutment portion 26, so that the rotating rod 25 and the withdrawal cylinder 31 are reset under the action of the first torsion spring 30. At this time, due to the presence of the withdrawn liquid, the sliding baffle 34 and the withdrawal cylinder 31 are relatively stationary. At this time, the second torsion spring 36 will be twisted in the reverse direction until the withdrawal cylinder 31 returns to the first position. At this time, the first opening 32 is again aligned with and connected to the third interface 15. At this time, under the action of the second torsion spring 36, the sliding baffle 34 returns to its initial position, and then the withdrawn liquid in the first part of the withdrawal cylinder 31 is discharged into the collection tube 16 through the first opening 32, completing the collection of the withdrawn liquid.

[0061] 2. When the sliding plate 21 rotates to the limit state, the through hole 48 is coaxial with the first interface 12. At this time, the connecting tube 45 of the rotating cylinder 44 is not coaxial with the first interface 12, and the physiological saline cannot be input into the retention needle 11. The injection continues until the pressure plate 42 drives the rotating cylinder 44 to move, and the connecting tube 45 is coaxial with the first interface 12. The physiological saline passes through the through hole 48, the connecting tube 45, the connecting cylinder 47, and the through tube 35 from the first cavity 53 and is discharged from the first interface 12 to start the injection flushing. Since there is pressure in the first cavity 53 at this time, the flushing force can be guaranteed. At the same time, when the water pressure in the first cavity 53 decreases, the connecting tube 45 is no longer coaxial with the first interface 12 under the action of the connecting spring 43 until the pressure in the first cavity 53 pushes the pressure plate 42 to move again so that the connecting tube 45 is connected to the through hole 48 and the connecting cylinder 47, thereby repeatedly performing pulsating flushing, which not only ensures the flushing force but also can achieve pulsating flushing.

[0062] The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. An auxiliary device for blood transfusion and infusion, characterized in that: include: A main body (10), the main body (10) is provided with a second interface (14) for connecting to a syringe (13), and a first interface (12) for connecting to a retention needle (11); A third interface (15) is provided on the main body (10), and the third interface (15) is connected to a collection tube (16) for collecting the withdrawn liquid through the collection tube (16); The main body (10) is provided with a flushing component (17), a retraction component (18), and a connecting component (19); The retraction assembly (18) comprises: A rotating rod (25) is rotatably arranged in the main body (10), a first torsion spring (30) is connected between the rotating rod (25) and the inner wall of the main body (10), a retraction cylinder (31) is rotatably arranged in the main body (10) near the first interface (12), and the rotating rod (25) is fixedly connected to the retraction cylinder (31); an inner cavity is arranged in the retraction cylinder (31), a rotating rod (51) is rotatably arranged in the retraction cylinder (31), one end of the rotating rod (51) passes through the retraction cylinder (31) and is connected to the inner wall of the main body (10) by a second torsion spring (36), the rotating rod (51) is fixedly connected to a sliding baffle (34) slidably arranged in the retraction cylinder (31), and a fixed baffle (37) is fixedly arranged in the retraction cylinder (31).

2. The blood transfusion and infusion auxiliary device according to claim 1, characterized in that: The fixed baffle (37) divides the inner cavity of the withdrawal cylinder (31) into a first part and a second part which are not connected to each other. The sliding baffle (34) is slidably arranged in the first part and divides the first part into two areas which are not connected to each other. A first opening (32) and a second opening (33) which are connected to the first part are opened on the side wall of the withdrawal cylinder (31). When the withdrawal cylinder (31) is rotated, the first opening (32) is located at the third interface (15) and is connected to the third interface (15), or the second opening (33) is located at the third interface (15) and is connected to the third interface (15), or the first opening (32) is opened. The second opening (33) is not connected to the third interface (15), and an opening connected to the first part is provided on an end wall of the main body (10) close to the first interface (12). A through pipe (35) is provided in the second part of the withdrawal cylinder (31), and both ends of the through pipe (35) extend to the two end surfaces of the withdrawal cylinder (31) and form openings on the two end surfaces of the withdrawal cylinder (31). When the withdrawal cylinder (31) is rotated, the opening of the through pipe (35) is positioned opposite to the first interface (12) and connected to the first interface (12), or the connection port (52) is positioned opposite to the first interface (12) and connected to the first interface (12).

3. The blood transfusion and infusion auxiliary device according to claim 2, characterized in that: A limit pin (38) is slidably provided on the sliding baffle (34), and a second spring (40) is connected between the limit pin (38) and the sliding baffle (34). A pin hole for embedding one end of the limit pin (38) is provided on the inner wall of the retraction cylinder (31), and a pushing head (39) is slidably connected in the pin hole. An abutting protrusion (41) for pushing the pushing head (39) is fixedly provided on the inner wall of the main body (10), so that the pushing head (39) pushes the limit pin (38) away from the pin hole.

4. The blood transfusion and infusion auxiliary device according to claim 3, characterized in that: The flushing assembly (17) includes a rotating disk (20) rotatably arranged in the main body (10), the rotating disk (20) is located on the side close to the second interface (14), the outer edge of the rotating disk (20) is attached to the inner wall of the main body (10), and the rotating disk (20) cooperates with the inner wall of the main body (10) to form a first cavity (53) close to the second interface (14), a mounting post (22) is fixedly arranged on the rotating disk (20), one end of the mounting post (22) is rotatably connected to the inner wall of the main body (10), and a sliding plate (21) in the first cavity (53) is fixedly arranged between the mounting post (22) and the rotating disk (20).

5. The blood transfusion and infusion auxiliary device according to claim 4, characterized in that: A fixed plate (23) is fixedly provided in the main body (10) and is located in the first cavity (53). The fixed plate (23) cooperates with the sliding plate (21) to separate the first cavity (53) into two parts. The opening of the second interface (14) formed on the inner wall of the first cavity (53) is located in the first part. A breathable water stop valve (24) is installed on the main body (10) and is connected to the second part.

6. The blood transfusion and infusion auxiliary device according to claim 5, characterized in that: A fixing ring (29) is fixedly connected to the inner wall of the main body (10), and the fixing ring (29) is embedded in the mounting column (22). A sliding bar (27) is slidably connected in the mounting column (22), and a first spring (28) is connected between the sliding bar (27) and the mounting column (22). An abutment portion (26) is fixedly connected to the rotating rod (25), and one end of the sliding bar (27) abuts against the abutment portion (26). When the mounting column (22) rotates, the end surface of the fixing ring (29) pushes the sliding bar (27) so that the sliding bar (27) finally disengages from the abutment portion (26).

7. The blood transfusion and infusion auxiliary device according to claim 6, characterized in that: A support plate (46) is fixedly provided in the main body (10), a connecting tube (47) coaxial with the first interface (12) is provided on the support plate (46), a through hole (48) is provided on the rotating disk (20), and the through hole (48) and the connecting tube (47) are coaxial when the rotating disk (20) rotates.

8. The blood transfusion and infusion auxiliary device according to claim 7, characterized in that: The retraction assembly (18) includes: a rotating cylinder (44) rotatably connected to the main body (10) and located between the support plate (46) and the rotating disk (20); a connecting tube (45) is provided on the rotating cylinder (44); the connecting tube (45) is connected to the through hole (48) and the connecting cylinder (47) by rotating the rotating cylinder (44); a mounting groove (49) connected to the first cavity (53) is provided in the main body (10); a pressure plate (42) is slidably connected in the mounting groove (49); the sliding track of the pressure plate (42) rotates around the main body (10); a connecting spring (43) is connected between the pressure plate (42) and the inner wall of the mounting groove (49); and the mounting groove (49) has a rod portion fixed to the rotating cylinder (44).

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