Dialyzer end cover and dialyzer shell

Abstract

The utility model discloses a dialyzer end cover and a dialyzer shell, and belongs to the technical field of dialyzers. Which comprises a cover body (8), a blood connector (2) is arranged in the center of the upper surface of the cover body (8), an annular sealing compression ring (11) is arranged at the upper end of the inner surface of the cover body (8), and the blood collection cover is characterized in that the section of the sealing compression ring (11) is conical, the angle of the conical tip of the sealing compression ring (11) is 30-60 degrees, and the height of the sealing compression ring (11) is 0.4-0.5 mm. According to the dialyzer end cover and the dialyzer shell, the sealing compression ring is arranged, sealing is achieved on the premise that a sealing ring is omitted, meanwhile, the sealing compression ring is designed to have fixed parameters, and the sealing reliability and durability of the end cover are guaranteed. By arranging the reinforcing ribs, the strength of the blood connector is improved. The inclination angle of the welding face is set to be 30-60 degrees, and the sealing performance of the dialyzer shell can be effectively guaranteed.

Description

Technical Field

[0001] A dialyzer end cover and a dialyzer shell belong to the technical field of dialyzers. Background Art

[0002] Dialyzers are essential medical consumables for dialysis treatment of kidney patients. Traditional dialyzers consist of a housing containing a fiber membrane. Polyurethane sealants 5 seal the ends of the membrane against ports on either end of the housing. End caps are installed at each end of the housing, creating a sealed contact with the sealant 5. This creates a sealed blood chamber between the end caps and the sealant 5. The patient's blood enters the blood chamber through the openings in the end caps and then passes through the fiber membrane within the housing for dialyzation.

[0003] In the prior art, the seal between the end cap and the sealant 5 is generally achieved by the following two methods:

[0004] (1) A sealing ring is provided on the inner upper part of the end cap. After the end cap and the housing are screwed together, the sealing ring squeezes the sealant 5. After the sealing ring is deformed under pressure, sealing is achieved. This method requires a sealing groove to be provided inside the housing, and then the sealing ring is placed in the sealing groove. Therefore, this sealing method is more complicated to process and requires an additional sealing ring, which increases the cost to a certain extent.

[0005] (2) A Chinese utility model patent application numbered 201320651945.0, filed on October 22, 2013, and entitled “A hemodialyzer housing” discloses a technical solution in which an annular sealing protrusion is provided on the inner side of the end cap. When the end cap is fixed to the housing, the annular sealing protrusion squeezes the sealant 5, forming a groove on the surface of the sealant 5. The annular sealing protrusion is embedded in the sealant 5 to achieve sealing.

[0006] This method can omit the sealing ring at the end cap, saving costs and reducing the processing difficulty of the end cap to a certain extent. However, when implementing this technical solution, it was found that after a period of use, the sealing performance is likely to decline. Experiments have shown that the reason for this problem is that when the sealing ring is used for sealing, the sealing is achieved by the deformation of the sealing ring after being compressed. Then, after the sealing ring is deformed, the elasticity of the sealing ring itself is used to seal the sealing surface, so this sealing state always exists. After the sealant 5 is squeezed by the annular protrusion to form a groove, the groove itself does not have a tendency to reset. Therefore, there is almost no elastic change between the annular protrusion and the groove, resulting in a decline in the sealing effect after long-term use. Experiments have also shown that when the annular sealing protrusion is used to achieve sealing, the persistence of the sealing effect is related to the material of the sealant 5 itself and the parameter setting of the annular sealing protrusion itself. For example, the greater the height of the annular protrusion, the more durable the sealing performance.

[0007] Therefore, under the premise of the existing technology of using sealing annular protrusions to achieve sealing, designing a technical solution that can enable the dialyzer to always maintain a high degree of sealing has become an urgent problem to be solved. Utility Model Content

[0008] The technical problem to be solved by the utility model is: to overcome the shortcomings of the existing technology and provide a dialyzer end cover and dialyzer housing that achieves sealing by setting a sealing pressure ring without omitting a sealing ring, and at the same time designs the sealing pressure ring as a fixed parameter to ensure the reliability and durability of the sealing at the end cover.

[0009] The technical solution adopted by the utility model to solve the technical problem is: the dialyzer end cover includes a cover body, a blood interface is provided at the center of the upper surface of the cover body, and an annular sealing pressure ring is provided at the upper end of the inner surface of the cover body, which is characterized in that the cross section of the sealing pressure ring is conical, the angle of the sealing pressure ring cone tip is 30°~60°, and the height of the sealing pressure ring is 0.4mm~0.5mm.

[0010] Preferably, the angle of the sealing pressure ring cone tip is 40°~50°.

[0011] Preferably, the blood interface is a sleeve structure, comprising an outer tube and a central tube coaxially arranged inside the outer tube, and an end thread is provided on the inner wall of the outer tube.

[0012] Preferably, an annular reinforcing rib is provided between the root of the blood interface and the cover body.

[0013] A dialyzer housing comprises a shell, a fiber membrane is arranged inside the shell, and sealants are arranged at both ends of the shell to achieve sealing between the fiber membrane and the shell. The dialyzer end cover is fixed at the shell port, and is characterized in that the dialyzer end cover is fixed to the shell, and the depth of the sealing pressure ring embedded in the sealant 5 is 0.2mm~0.4mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the dialyzer end cap and dialyzer housing, a sealing pressure ring is provided to achieve sealing without omitting a sealing ring. At the same time, the sealing pressure ring is designed to have fixed parameters, thereby ensuring the reliability and durability of the seal at the end cap.

[0016] In the dialyzer end cap and the dialyzer housing, the strength of the blood connector is improved by arranging reinforcing ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of the dialyzer.

[0018] Figure 2 A top view of the dialyzer end cap.

[0019] Figure 3 for Figure 2 Middle AA section view.

[0020] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0021] Among them: 1, dialysate interface 2, blood interface 3, end cap 4, fiber membrane 5, sealant 5 6, shell 7, end 8, cover 9, end thread 10, reinforcing rib 11, sealing pressure ring 12, welding surface. DETAILED DESCRIPTION

[0022] Figures 1 to 4 This is the best embodiment of the present invention, Figures 1 to 4 The utility model is further described.

[0023] like Figure 1 As shown, the dialyzer housing includes a shell 6, with end caps 3 provided at the ports at both ends of the shell 6. The shell 6 is cylindrical with both ends open, and a fiber membrane 4 is provided inside the shell 6. The fiber membrane 4 is a strip-shaped structure and is sealed at both ends of the shell 6 by a sealant (polyurethane glue).

[0024] Taking one end of the dialyzer shell as an example: a dialysate interface 1 is radially arranged at the end of the shell 6, and a blood interface 2 is arranged on the top of the end cover 3. The flow direction of blood in the shell 6 is opposite to the flow direction of dialysate in the shell 6, that is: when the blood interface 2 of one end cover 3 is the blood inlet, the dialysate interface 1 close to it is the dialysate outlet, and vice versa.

[0025] After entering the dialyzer shell through the end cap 3 (denoted as the proximal end), the blood enters the fiber membrane 4 and flows radially inside the fiber membrane 4 to the other end (distal end) of the shell 6; the dialysate enters the dialysate interface at the distal end of the shell 6 and flows through the gaps between the fiber membranes 4 in the shell 6 to the proximal end of the shell 6. Therefore, during the reverse flow of blood and dialysate, harmful substances in the blood pass through the fiber membrane 4 into the dialysate and are then discharged to achieve dialysis.

[0026] Combine Figures 2 and 3 The end cap 3 includes a circular cover body 8. The blood interface 2 is protruding from the center of the upper surface of the cover body 8 and is provided with a terminal 7. The blood interface 2 is housed within the terminal 7. The blood interface 2 is a cannula structure, comprising an outer tube and a central tube coaxially disposed within the outer tube. The inner wall of the outer tube of the blood interface 2 is provided with a terminal thread 9, which connects the cover body 8 to the external blood line.

[0027] After the external blood line is docked with the end 7, the internal thread on the outer wall of the blood line is threadedly connected to the end thread 9, so that the interior of the blood line is docked with the central tube. The patient's blood to be dialyzed enters the cover body 8 through the end 7, and then further enters the shell 6 for dialysis treatment.

[0028] An annular reinforcing rib 10 is further provided between the root of the blood connector 2 and the cover 8 . The provision of the reinforcing rib 10 improves the strength of the blood connector 2 .

[0029] The lower surface of the cover 8 is a vertically arranged cylindrical structure. A welding surface 12 is provided on the upper portion of the inner wall of the cylindrical structure. The diameter of the welding surface 12 facing the housing 6 is larger than the diameter of the end facing away from the housing 6, giving the welding surface 12 an inclined surface shape. In the dialyzer housing, the inclination angle of the welding surface 12 is 30° to 60°. Experimental results show that setting the inclination angle of the welding surface 12 to 30° to 60° can effectively ensure the sealing of the dialyzer housing.

[0030] The top surface of the inner surface of the cover body 8 is an arc-shaped arc surface, the lower end of the arc surface is circular, and a sealing pressure ring 11 is provided on the outer ring of the lower end of the arc surface. Figure 4The end cap 3 is snapped onto the upper end of the housing 6. Once snapped into place, the welding surface 12 is aligned with the corresponding end surface of the upper end of the housing 6. The end cap 3 and the housing 6 are then fixed together using conventional ultrasonic welding. After the end cap 3 and the housing 6 are fixed together, the sealing ring 11 presses the sealant 5 to form a groove, which is then embedded in the groove to achieve sealing.

[0031] In the end cap 3 of the dialyzer housing, the sealing pressure ring 11 is a conical structure, with the tip of the cone facing the side of the sealant 5. The angle of the tip of the sealing pressure ring 11 is 30° to 60°, and the preferred angle is 40° to 50°. Experiments have found that when the angle of the tip of the sealing pressure ring 11 is 30° to 60°, the sealant 5 can be effectively pressed into the groove, thereby forming a closer contact and enhancing the sealing effect. At the same time, sufficient pressure can be applied during the pressing process to ensure that the sealant 5 fully fills the gap, without causing insufficient pressure due to excessive angles or damaging the sealing material due to excessive pressure due to too small angles.

[0032] Setting the angle of the sealing ring 11's tip between 30° and 60° provides excellent mechanical stability, neither too sharp to break easily nor too blunt to effectively press into the sealant 5. This design evenly distributes pressure during welding, preventing deformation or damage to the end cap 3 and housing 6. This angle range is compatible with a variety of sealant 5 materials, ensuring a good seal even with different materials. It provides sufficient pressure to ensure a secure seal even with sealants of varying hardness and viscosity.

[0033] And in the subsequent ultrasonic welding process, the 30°~60° conical structure can better guide the flow of the sealant 5 during the vibration process to achieve an ideal sealing effect. This design can better adapt to the heat distribution during the welding process and prevent uneven welding or overheating and decomposition of the sealant 5.

[0034] The height of the sealing pressure ring 11 is 0.4mm~0.5mm. After the end cap 3 is fixed to the housing 6, the depth of the sealing pressure ring 11 embedded in the sealant 5 is 0.2mm~0.4mm. Experiments have found that setting the height of the sealing pressure ring 11 to 0.4mm~0.5mm can ensure that the pressing protrusion is pressed deeply enough into the interior of the sealant 5 during the welding process, that is, the aforementioned 0.2mm~0.4mm, thereby achieving a sufficient sealing effect. This height range can effectively compact the sealant 5, fill any gaps or unevenness between the end cap 3 and the housing 6, and improve the overall sealing performance.

[0035] A sealing ring 11 with a height of 0.4mm to 0.5mm ensures that the sealant protrusion has sufficient structural strength and is not susceptible to breakage or deformation during manufacturing or use. This height range provides an appropriate balance of rigidity and elasticity, allowing the sealant protrusion to effectively press into the sealant 5 while also withstanding the mechanical stress generated during welding.

[0036] During ultrasonic welding, a sealing ring 11 with a height of 0.4mm to 0.5mm ensures that the pressing protrusions effectively press into the sealant 5 during welding, preventing incomplete sealing due to insufficient height and increased welding difficulty due to excessive height. This height range optimizes the ultrasonic welding effect, ensures uniform heat distribution during welding, and prevents overheating or uneven welding.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A dialyzer end cap, comprising a cap body (8), a blood interface (2) provided at the center of the upper surface of the cap body (8), and an annular sealing pressure ring (11) provided at the upper end of the inner surface of the cap body (8), characterized in that: The cross section of the sealing pressure ring (11) is conical, the angle of the cone tip of the sealing pressure ring (11) is 30° to 60°, and the height of the sealing pressure ring (11) is 0.4 mm to 0.5 mm.

2. The dialyzer end cap according to claim 1, wherein: The angle of the cone tip of the sealing pressure ring (11) is 40°~50°.

3. The dialyzer end cap according to claim 1, wherein: The blood interface (2) is a sleeve structure, comprising an outer tube and a central tube coaxially arranged inside the outer tube, and an end thread (9) is provided on the inner wall of the outer tube.

4. The dialyzer end cap according to claim 3, wherein: An annular reinforcing rib (10) is provided between the root of the blood interface (2) and the cover body (8).

5. A dialyzer housing provided with a dialyzer end cap according to any one of claims 1 to 4, comprising a housing (6), a fiber membrane (4) provided in the housing (6), a sealant (5) for achieving a seal between the fiber membrane (4) and the housing (6) provided at both ends of the housing (6), the dialyzer end cap being fixed at a port of the housing (6), characterized in that: The dialyzer end cap is fixed to the housing (6), and the sealing pressure ring (11) is embedded in the sealant (5) to a depth of 0.2 mm to 0.4 mm.

Images