Small cap and end cover for hemoperfusion device

Abstract

The utility model designs a small cap and an end cover for a hemoperfusion device. The small cap body comprises an end wall, a sealing column, a peripheral wall and a fixing bolt sliding groove. The sealing column is a hollow cylinder and extends from the center of the end wall to the small cap opening, and a sealing column opening is formed in the end, close to the small cap opening, of the sealing column; external threads are arranged on the periphery of the sealing column; the space between the external thread and the peripheral wall is a thread cavity; two symmetrical fixing bolt sliding grooves are formed in the peripheral wall, openings of the fixing bolt sliding grooves are formed in the opening end of the small cap, and the fixing bolt sliding grooves are matched with the fixing bolts in size; the end cover body is arched, and the center of the end cover extends outwards to form a blood nozzle; a circle of sheath is arranged on the periphery of the blood nozzle, internal threads are arranged on the inner wall of the sheath, and two symmetrical fixing bolts are arranged outside the sheath. A circle of annular protrusion is arranged at the end, connected with the middle cylinder, of the end cover and used in cooperation with the middle cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a small cap and an end cover for a blood perfusion device. Background Art

[0002] Hemoperfusion is a technique for purifying whole blood or plasma. This technique is effective in clearing macromolecular substances and protein-bound toxins in the blood. The diseases involved include kidney disease, acute poisoning, skin diseases, immune diseases, etc. Hemoperfusion requires a hemoperfusion device, which is filled with adsorbents for purifying blood. In the extracorporeal circulation circuit, blood passes through the hemoperfusion device and contacts the adsorbent. The target substance is retained by the adsorbent, and the blood returns to the patient's body, thereby achieving the purpose of reducing the concentration of toxic and harmful substances in the blood.

[0003] The blood perfusion device will directly contact the patient's blood or plasma, so it is necessary to keep the blood perfusion device sterile and pyrogen-free. This requires the blood perfusion device to have good sealing properties and to be conveniently connected to the extracorporeal circulation circuit when in use. The current blood perfusion device is generally composed of a small cap, an end cap, a sealing ring, a filter, and a middle tube. The small cap and end cap of the perfusion device are components of the perfusion device, and these two components are closely related to the sealing of the perfusion device. Since the high temperature and high pressure sterilization treatment will cause the threads to loosen to varying degrees, there is a risk of contamination.

[0004] The Chinese utility model patent announcement number is CN204170178U, and the patent application number is: CN201420574129.9, which discloses a cap for a blood perfusion device, including a cap body and a sealing cushion. The inner circumference of the sealing column is also provided with an exhaust groove for exhausting the air between the sealing cushion and the end wall, ensuring that the sealing cushion is installed in place. This patent directly eliminates the installation of the sealing cushion and integrates the cylindrical plug with the small cap. The material of the small cap is polypropylene, which can ensure the sealing of the cylindrical plug while taking into account the hardness of the small cap. Utility Model Content

[0005] The utility model aims to solve the problems of the sealing performance of the small cap and the end cover, the thread stripping of the small cap, the loosening of the small cap and the over-tightening of the small cap.

[0006] The technical solution of the utility model is as follows: The utility model is designed to be a small cap and an end cover for a blood perfusion device. The small cap is made of polypropylene, and the end cover is made of polycarbonate. The small cap body comprises an end wall, a sealing column, a peripheral wall and a fixing bolt slide groove. The sealing column is a hollow cylinder, extending from the center of the end wall to the opening of the small cap, and is in the shape of a hollow cylinder. The end of the sealing column close to the opening of the small cap is formed as a sealing column opening; an external thread is arranged on the outer periphery of the sealing column; the space between the external thread and the peripheral wall is a threaded cavity; the thickness of the end wall in the sealing column is 0.5 mm to 1 mm higher than the thickness of the end wall of the threaded cavity, and a cylindrical plug protrudes from the center of the inner end wall of the sealing column by 5 mm to 6 mm; there are two symmetrical fixing bolt slide grooves on the peripheral wall, the fixing bolt slide groove opening is at the opening end of the small cap, and the size of the fixing bolt slide groove matches the size of the fixing bolt; the vertical distance from the highest point of the fixing bolt slide groove to the opening of the small cap is 0.5 mm to 1 mm higher than the thread height. The end cap body is in the shape of an arch, with a blood nozzle extending outward from the center of the end cap; there is a circle of sheath around the blood nozzle, the inner wall of the sheath is provided with internal threads, and there are two symmetrical fixing bolts outside the sheath; there is a circle of annular protrusions at the end of the end cap connected to the middle tube, which is used in conjunction with the middle tube. The small cap is used in conjunction with the end cap to prevent the thread of the end cap and the small cap from slipping, the small cap screw is too tight, and the small cap screw is loose. The cylindrical plug used for sealing is designed as an integral part of the small cap, eliminating the operation of installing the sealing gasket.

[0007] The blood nozzle is provided with a sheath around it, and the internal thread of the sheath matches the external thread of the small cap. When the small cap is removed and the blood nozzle is connected to an external pipeline, the external thread of the external blood pipeline connector matches the internal thread of the sheath, making the connection between the blood nozzle and the external pipeline more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the present invention;

[0009] In the figure: 1. small cap; 11. cylindrical plug; 12. external thread; 13. circular hole; 14. fixing bolt slide groove; 15. fixing bolt slide groove opening; 16. sealing column; 17. small cap body; 18. small cap opening end; 19. end wall; 2. end cover; 21. blood nozzle; 22. fixing bolt; 23. internal thread; 24. end cover body; 25. end cover sleeve. DETAILED DESCRIPTION

[0010] With reference to the accompanying drawings, the specific embodiments of the present invention are described in detail. Although the present invention will be described in conjunction with exemplary embodiments, it should be understood that the present invention is not limited to these exemplary embodiments and also includes various modifications and improvements.

[0011] A small cap and an end cap for blood perfusion in this embodiment are shown in FIG. Figure 1, including a small cap body 1 and an end cover body 2, the small cap body 1 is connected with the internal thread 23 of the end cover sleeve 25 through the external thread 12 on the sealing column 16. At the same time, the fixing bolt 22 enters the fixing bolt slide slot opening 15, and as the thread rotates, the fixing bolt 22 slides along the fixing bolt slide slot 14 toward the small cap end wall 19. When the thread is screwed to the highest point, the fixing bolt 22 just enters the circular hole 13 and is fixed. At this time, the cylindrical plug 11 tightly blocks the blood nozzle 21 to form a good seal. Prevent the adsorbent liquid from leaking, and at the same time ensure the sterile state of the tank body after sterilization. When using the perfusion device, forcefully slide the fixing bolt 22 out of the circular hole 13, so that the fixing bolt slides along the slide slot 14 toward the small cap opening 18, and the small cap external thread 12 and the internal thread 25 of the end cover sleeve are rotated and separated until the fixing bolt 22 slides out of the fixing bolt slide slot opening 15. The external pipe is connected to the blood nozzle 21 and connected to the inner thread 25 of the sheath to fix the external pipe so that the blood perfusion device can be used normally.

[0012] The present invention designs the sealing cushion of the small cap as a small cap cylindrical plug, and the two parts are integrated into one, which reduces the assembly process of the blood perfusion device, is convenient to use, saves the installation process of the sealing cushion, and improves the sealing performance of the small cap. The coordinated use of the fixing bolt and the fixing bolt slide groove ensures the correct installation of the small cap, and also avoids the phenomenon of the thread of the small cap being stripped and the situation that the small cap is too tight and cannot be opened.

Claims

1. A cap and end cover for a blood perfusion device, characterized in that The small cap body comprises an end wall, a sealing column, a peripheral wall and a fixing bolt slide groove; the sealing column extends from the center of the end wall to the small cap opening, and a cylindrical plug protrudes from the center of the inner end wall of the sealing column; the end of the sealing column close to the small cap opening is formed as a sealing column opening; an external thread is arranged on the outer periphery of the sealing column; the space between the external thread and the peripheral wall is a threaded cavity; there are two symmetrical fixing bolt slide grooves on the peripheral wall, the fixing bolt slide grooves open at the small cap opening end, and the size of the fixing bolt slide grooves matches the size of the fixing bolt; it is characterized in that the end cover body is circular, and a blood nozzle extends outward from the center of the end cover; there is a circle of sheath around the blood nozzle, and the inner wall of the sheath is provided with an internal thread, which matches the external thread of the small cap, and there are two symmetrical fixing bolts outside the sheath; there is a circle of annular protrusions at the end of the end cover connected to the middle cylinder, which is used in conjunction with the middle cylinder.

2. A small cap and end cover for a blood perfusion device according to claim 1, characterized in that: The thickness of the end wall in the sealing column included in the small cap is 0.5 mm to 1 mm higher than the thickness of the end wall of the threaded cavity.

3. The small cap and end cover for a blood perfusion device according to claim 1, characterized in that: The cap is made of polypropylene and the end cap is made of polycarbonate.

4. A small cap and end cover for a blood perfusion device according to claim 1, characterized in that: The small cap contains a cylindrical plug in the sealing column, with a height of 5 mm to 6 mm.

5. The small cap and end cover for a blood perfusion device according to claim 1, characterized in that: The direction of the fixing bolt slide groove on the peripheral wall of the small cap is the same as the direction of the external thread of the small cap.

6. A small cap and end cover for a blood perfusion device according to claim 1, characterized in that: The fixing bolt slide groove on the peripheral wall of the small cap is symmetrically distributed on the peripheral wall of the small cap, and the total horizontal length from the opening of the fixing bolt slide groove to the circular hole does not exceed half of the circumference of the small cap; the total vertical height from the opening of the fixing bolt slide groove to the circular hole exceeds the vertical height of the thread by 0.5 mm to 1 mm.

7. A small cap and end cover for a blood perfusion device according to claim 1, characterized in that: The fixing bolt slide groove on the peripheral wall of the small cap extends vertically from the opening end of the small cap to the end wall of the small cap by 3 mm to 4 mm, and then extends obliquely to the end wall of the small cap at an angle of 45° to 60° to form an oblique slide groove.

8. The small cap and end cover for a blood perfusion device according to claim 1, characterized in that: Two symmetrical fixing bolts are arranged outside the protective sleeve on the end cover, and the vertical distance between the fixing bolts and the surface of the end cover is the same as the vertical distance between the circular hole of the slide groove and the opening of the small cap.

9. A small cap and end cover for a blood perfusion device according to claim 1, characterized in that: There are two symmetrical fixing bolts outside the sheath on the end cover. When the fixing bolts of the end cover are used in conjunction with the fixing bolt slide grooves of the small cap, the fixing bolts are fixed in the circular holes, and the blood nozzle opening of the end cover is combined with the cylindrical plug and sealed.

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