Fastening type sealing ring suitable for steam sterilization and mounting structure

Abstract

The utility model relates to a fastening type sealing ring suitable for steam sterilization, which comprises a sealing ring body, a through hole is arranged in the middle of the sealing ring body, the sealing ring body comprises a fastening part and a buckling part from outside to inside, annular convex ribs are arranged on the upper side and the lower side of the fastening part, and the buckling part is an annular groove. The rebounding parts of the sealing ring and the annular convex rib can be used for filling the expanded area, so that the end cover, the shell and the sealing ring are always kept integrated before and after sterilization, the size change caused by steam sterilization is counteracted, and the sealing effect is ensured; the edge of the through hole is a straight edge and plays a role in guiding the flow direction of blood in a blood chamber of the dialyzer, so that the blood can smoothly enter the hollow fiber membrane downwards, and meanwhile, a V-shaped included angle formed by a traditional O-shaped ring, the shell and the surface of the sealant can be avoided, so that the blood coagulation phenomenon caused by poor circulation due to the fact that the blood enters dead corners and dead spaces in the treatment process is prevented; the utility model further provides a fastening type sealing ring installation structure which comprises the fastening type sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of hemodialysis equipment, in particular to a sealing ring. Background Art

[0002] A dialyzer is generally composed of a hollow fiber membrane and a shell. The hollow fiber membrane is placed inside the shell. The dialysate and blood chamber interfaces designed at both ends of the shell end cover are connected to the dialysate inlet / outlet pipelines and blood inlet / outlet pipelines of the blood purification dialysis machine respectively.

[0003] During the dialyzer production process, most dialyzer products on the market are sterilized by irradiation, but irradiation sterilization can easily lead to problems such as yellowing, brittleness, and increased precipitates of the material. Compared with irradiation sterilization, steam sterilization is non-toxic and residue-free after steam sterilization. The only sterilization residue is water vapor, which is a sterilization method with better biocompatibility. However, steam sterilization also has its shortcomings. For example, during the steam sterilization process, the dialyzer components will undergo a process of thermal expansion and contraction, which will cause the dialyzer shell and end cover to change and expand in size, and gaps will be generated at the threaded connections, causing them to loosen, resulting in the general O-ring being unable to perform its sealing function. During treatment, blood will leak from the gap between the end cover and the shell, failing to meet the sealing requirements. Utility Model Content

[0004] In order to solve the problem in the prior art that the dialyzer sealing ring cannot meet the sealing requirements during steam sterilization, the utility model provides a fastening sealing ring suitable for steam sterilization, which can offset the impact of dimensional changes caused by steam sterilization and ensure the sealing effect.

[0005] To achieve the above-mentioned purpose, the utility model provides a fastening sealing ring suitable for steam sterilization, including a sealing ring body, a through hole is provided in the middle of the sealing ring body, the sealing ring body includes a fastening part and a buckling part from the outside to the inside, annular ribs are provided on the upper and lower sides of the fastening part, and the buckling part is an annular groove.

[0006] The dialyzer housing has external threads on its outer end, and the inner wall of the end cap has matching internal threads. A sealing ring is placed between the end of the dialyzer housing and the interior of the end cap. The inner side of the end cap has an annular ridge that fits into an annular groove. When the dialyzer housing and end cap are threaded together, the end cap and the dialyzer housing end squeeze the sealing ring, causing the annular rib on the sealing ring to be compressed. During steam sterilization of the ventilator, the dialyzer housing and end cap change and expand in size. The compressed annular rib then rebounds and fills the gap above and below the threaded connection, maintaining the seal.

[0007] Furthermore, the guide portion is further provided on the side of the buckle portion close to the through hole, and both sides of the guide portion are provided with a fitting surface I and a fitting surface II inclined toward the buckle portion.

[0008] Furthermore, the connections between the fitting surface I and the fitting surface II and the annular groove are both provided with rounded corners.

[0009] Furthermore, the horizontal inclination angles of the fitting surface I and the fitting surface II in the longitudinal section are both 18°±5°, and the horizontal inclination angle of the edge of the annular convex groove close to the rounded corner in the longitudinal section is 50°±5°.

[0010] Furthermore, there are more than two annular ribs on the upper and lower sides of the fastening portion.

[0011] Furthermore, the edge of the through hole of the sealing ring body is a vertical edge.

[0012] Furthermore, an annular convex pattern matching the annular groove is provided on the inner side of the end cover.

[0013] The utility model also provides a fastening sealing ring installation structure, which includes the above-mentioned fastening sealing ring, and also includes an end cover and a dialyzer shell, the end of the dialyzer shell is threadedly connected to the end cover; the fastening sealing ring is located between the inner side of the end cover and the top of the dialyzer shell; a hollow fiber membrane is provided below the lower part of the sealing ring; the hollow fiber membrane and the inner wall of the dialyzer shell are sealed by sealant.

[0014] The beneficial effects of the utility model are:

[0015] 1. The annular rib structure on the fastening part of the sealing ring can support the end cover and the housing. Before sterilization, when the dialyzer housing and the end cover are threaded together, the sealing ring and the annular rib are compressed to a high degree. After sterilization, the dimensions of the end cover and the housing change, and the assembly gap expands. The rebound part of the sealing ring and the annular rib can fill the expanded area, so that the end cover, the housing and the sealing ring always remain integrated before and after sterilization, offsetting the dimensional changes caused by steam sterilization and ensuring the sealing effect.

[0016] 2. The straight edge of the through hole guides the blood flow in the dialyzer blood chamber, allowing the blood to flow smoothly downward into the hollow fiber membrane. At the same time, it avoids the V-shaped angle formed between the traditional O-ring and the shell and sealant surface, thereby preventing the blood from entering the dead corners and dead spaces during treatment, resulting in poor circulation and clotting.

[0017] 3. The fitting surface I and the fitting surface II of the guide part have an oblique angle. When the sealing ring contacts the end cover, the fitting surface I serves as the fitting surface to fit the end cover, and the rounded areas on the fitting surface I and the fitting surface II serve as top angles for support, so that the sealing ring fitting surface I and the end cover can fit tightly together to prevent blood from entering the dead corner; the fitting surface II of the sealing ring in contact with the sealant surface can also effectively block the sealant surface. The setting of the fitting surface I and the fitting surface II can reduce the contact area between the blood and the sealant surface and reduce the occurrence of blood coagulation on the sealant surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the fastening seal ring in the utility model;

[0019] Figure 2 This is a cross-sectional view of the fastening seal ring in the utility model;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the structure of the dialyzer in the present utility model;

[0022] Figure 5 This is a schematic diagram of the sealing ring installation structure of the present invention;

[0023] Figure 6 This is a structural diagram of the end cover in the utility model;

[0024] In the figure: 1. Sealing ring body; 2. Fastening part; 3. Buckling part; 4. Annular rib; 5. Annular groove; 6. Guide part; 7. Fitting surface I; 8. Fitting surface II; 9. Fillet; 10. Vertical edge; 11. End cover; 12. Dialyzer shell; 13. Hollow fiber membrane; 14. Blood chamber; 15. Blood inlet; 16. Blood outlet; 17. Dialysate inlet; 18. Dialysate outlet; 19. Annular convex pattern. DETAILED DESCRIPTION

[0025] The following describes in detail a fastening seal ring and an installation structure suitable for steam sterilization according to the present invention in conjunction with the embodiments.

[0026] Incorporated into the dialyzer seal mounting structure, such as Figure 4 、 Figure 5 As shown, the mounting structure includes the above-mentioned fastening sealing ring, and also includes an end cover 11 and a dialyzer shell 12, the end of the dialyzer shell 12 is threadedly connected to the end cover 11; the fastening sealing ring is located between the inner side of the end cover 11 and the top of the dialyzer shell 12; a hollow fiber membrane 13 is provided below the lower part of the sealing ring; the hollow fiber membrane 13 and the inner wall of the dialyzer shell 12 are sealed by sealant.

[0027] like Figure 4 、 Figure 6As shown, the end caps 11 at the upper and lower ends of the dialyzer housing 12 are respectively provided with a blood inlet 15 and a blood outlet 16; the dialysate inlet 17 and the dialysate outlet 18 are provided on the side of the housing. The hollow fiber membrane 13 is a fiber bundle composed of nearly 10,000 hollow fiber filaments. Generally, when manufacturing a dialyzer, the hollow fiber membrane 13 is placed inside the dialyzer housing 12, and then hot-melt encapsulation is performed to fix the edges of the fiber bundle to the two ends of the dialyzer housing 12. Then, sealant, such as polyurethane glue, is injected into the edges of the fiber bundle at both ends of the dialyzer housing 12; then centrifugation is performed to ensure that the edges of the fiber bundle on the inner wall of the dialyzer housing 12 are evenly sealed. Finally, the excess parts of the fiber bundle at both ends are cut off to form a flat sealing surface. The sealing ring is placed between the sealing surface and the end caps 11. The end caps 11 are installed at both ends of the dialyzer housing 12 to complete the manufacturing process.

[0028] The inner cavity between the end cap 11 and the hollow fiber membrane 13 forms a blood chamber 14. When blood enters the blood chamber 14 from the blood inlet 15 of the end cap 11, and then enters the hollow fiber membrane 13, the dialysate enters the inner cavity of the dialyzer shell 12 from the dialysate inlet 17 on the outside of the dialyzer shell 12. The diameter of each fiber filament of the hollow fiber membrane 13 is about 200 μm, and the outer wall is densely provided with nano-scale pores. Under the action of the dialysate, waste and excess water and electrolytes in the blood will flow out from the nano-scale pores into the inner cavity of the dialyzer shell 12, and flow out along the dialysate outlet 18 on the side of the dialyzer shell, and blood will flow out from the blood outlet 16 of the end cap 11 at the other end; the dialysate and blood flow channels are complementary and connected inside the dialyzer shell 12.

[0029] like Figure 1 、 Figure 2 、 Figure 3 As shown, a fastening type sealing ring suitable for steam sterilization includes a sealing ring body 1, a through hole is provided in the middle of the sealing ring body 1, and the sealing ring body 1 includes a fastening part 2 and a buckling part 3 from the outside to the inside, annular ribs 4 are provided on the upper and lower sides of the fastening part 2, and the buckling part 3 is an annular groove 5.

[0030] The dialyzer housing has external threads on its outer end, and the inner wall of the end cap 11 has matching internal threads. A sealing ring is positioned between the end of the dialyzer housing and the interior of the end cap 11. The inner side of the end cap 11 features an annular ridge that engages within the annular groove 5. When the dialyzer housing and end cap 11 are threaded together, the end cap 11 and the dialyzer housing end squeeze the sealing ring, creating a compressed annular rib 4 on the sealing ring. During steam sterilization of the ventilator, the dialyzer housing 12 and end cap 11 change and expand in size. However, the compressed annular rib 4 rebounds and fills the gap between the threaded connection, maintaining a sealed state.

[0031] In this embodiment, the sealing ring body 1 , the fastening portion 2 and the buckling portion 3 are integrally formed.

[0032] Preferably, a guide portion 6 is further provided on the side of the buckling portion 3 close to the through hole, and both sides of the guide portion 6 are provided with a fitting surface I7 and a fitting surface II8 inclined toward the buckling portion 3.

[0033] The fitting surface I7 and the fitting surface II8 of the guide portion 6 have an oblique angle. When the sealing ring contacts the end cover 11, the fitting surface I7 is fitted with the end cover 11 to prevent dead angles in the connection part, which may cause blood to enter. The fitting surface II8 where the sealing ring contacts the sealing rubber surface can also effectively block the sealing rubber surface. The setting of the fitting surface I7 and the fitting surface II8 can reduce the contact area between blood and the sealing rubber surface, thereby reducing the risk of blood coagulation on the sealing rubber surface.

[0034] Better, such as Figure 3 As shown, the joints between the annular groove 5 and the mating surfaces I7 and II8 are both provided with rounded corners 9. These rounded corners 9 on the mating surfaces I7 and II8 serve as support angles, ensuring a tight fit between the sealing ring mating surface I7 and the end cap 11. In this embodiment, the horizontal inclination angle of both mating surfaces I7 and II8 in the longitudinal cross-section is 18°, while the horizontal inclination angle of the edge of the annular groove 5 near the rounded corner in the longitudinal cross-section is 50°. This angle matches the angle of the inner wall of the end cap 11, achieving a better fit.

[0035] Preferably, there are two or more annular ribs 4 to ensure a satisfactory sealing effect. In this embodiment, there are two annular ribs 4 on each side of the fastening portion 2, which is beneficial for ensuring a good sealing effect and also ensures that the annular ribs 4 do not squeeze each other after compression, and that they subsequently rebound smoothly to fill the gap between the end cap 11 and the dialyzer housing 12.

[0036] Better, such as Figure 2 As shown, the edge of the through hole of the sealing ring body 1 is a vertical edge 10. The straight edge of the through hole guides the blood flow in the dialyzer blood chamber 14, allowing blood to smoothly flow downward into the hollow fiber membrane. At the same time, it avoids the V-shaped angle formed by the traditional O-ring and the shell and sealant surface, thereby preventing blood from entering dead corners and dead spaces during treatment, resulting in poor circulation and clotting.

Claims

1. A fastening type sealing ring suitable for steam sterilization, comprising a sealing ring body (1), wherein a through hole is provided in the middle of the sealing ring body (1), characterized in that: The sealing ring body (1) comprises a fastening portion (2) and a buckling portion (3) from the outside to the inside. The fastening portion (2) is provided with annular ribs (4) on both the upper and lower sides, and the buckling portion (3) is an annular groove (5).

2. The fastening seal ring suitable for steam sterilization according to claim 1, characterized in that: A guide portion (6) is further provided on one side of the buckle portion (3) close to the through hole, and both sides of the guide portion (6) are provided with a fitting surface I (7) and a fitting surface II (8) inclined toward the buckle portion (3).

3. The fastening seal ring suitable for steam sterilization according to claim 2, characterized in that: The joints between the fitting surface I (7) and the fitting surface II (8) and the annular groove (5) are both provided with rounded corners (9).

4. The fastening seal ring suitable for steam sterilization according to claim 3, characterized in that: The horizontal inclination angles of the fitting surface I (7) and the fitting surface II (8) on the longitudinal section are both 18°±5°, and the horizontal inclination angle of the edge of the annular groove (5) close to the rounded corner on the longitudinal section is 50°±5°.

5. The fastening seal ring suitable for steam sterilization according to any one of claims 1 to 4, characterized in that: There are more than two annular ribs (4) on both upper and lower sides of the fastening portion (2).

6. The fastening seal ring suitable for steam sterilization according to any one of claims 1 to 4, characterized in that: The edge of the through hole of the sealing ring body (1) is a vertical edge (10).

7. The fastening seal ring suitable for steam sterilization according to claim 5, characterized in that: The edge of the through hole of the sealing ring body (1) is a vertical edge (10).

8. A fastening seal ring installation structure, characterized in that: It comprises the fastening sealing ring as described in any one of claims 1 to 7, and also comprises an end cover (11) and a dialyzer shell (12), the end of the dialyzer shell (12) is threadedly connected to the end cover (11); the fastening sealing ring is located between the inner side of the end cover (11) and the top of the dialyzer shell (12); a hollow fiber membrane is provided below the lower part of the sealing ring; the hollow fiber membrane and the inner wall of the dialyzer shell (12) are sealed by a sealant.

9. The fastening seal ring installation structure according to claim 8, characterized in that: An annular convex pattern (19) matching the annular groove (5) is provided on the inner side of the end cover (11).

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