Dialyzer shell

Abstract

The utility model belongs to the technical field of blood purification. The dialyzer shell comprises a first barrel, a second barrel, a dialysate connector, reinforcing ribs and a first boss, the first barrel is arranged at the two ends of the second barrel, the dialysate connector and the first boss are arranged on the outer side of the first barrel, the dialysate connector is perpendicular to the axis of the first barrel, the first boss is arranged in the mode that the first barrel protrudes outwards, and the reinforcing ribs are arranged on the first boss. The first boss is located on the side, close to a port of the first barrel, of the dialysate connector, a plurality of reinforcing ribs are arranged between the dialysate connector and the first barrel, one reinforcing rib is connected with the first boss, and the other reinforcing ribs are connected with the outer wall of the first barrel in an arc mode. The first boss is arranged on the outer side of the first barrel, one reinforcing rib is connected with the first boss, the other reinforcing ribs are connected with the outer wall of the first barrel in an arc mode, sharp points can be eliminated, the wall thickness of the root of the dialysate connector is kept uniform, generation of internal stress is reduced, and therefore the strength of the dialysate connector is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of blood purification technology, and in particular to a dialyzer shell. Background Technology

[0002] Dialyzer: The dialyzer mainly uses the principle of a semipermeable membrane to introduce the patient's blood and dialysate into the dialyzer at the same time. The two flow in opposite directions inside and outside the dialysate membrane. With the help of the solute gradient and osmotic gradient on both sides of the membrane, toxins and excess water retained in the body are removed, while replenishing the substances needed by the body.

[0003] The dialysis membrane is one of the most critical components of a dialyzer, playing a central filtration role in the hemodialysis process. Dialysis membranes are typically made of synthetic polymer materials such as polysulfone (PS), polyethersulfone (PES), polyacrylonitrile (PAN), and polyamide (PA). The main function of the dialysis membrane is to utilize the solute concentration difference across the hollow fiber membrane, through osmosis, diffusion, and ultrafiltration, to allow small molecule waste products in the blood (such as urea, creatinine, and excess electrolytes) to pass through the membrane while preventing larger molecules (such as blood cells and proteins) from passing through, thereby purifying the blood.

[0004] Housing: The dialyzer housing refers to the outer casing of the dialyzer, made of polycarbonate (PC) material, and is typically used to enclose and protect the internal structure and components of the dialyzer. This housing is designed to provide corrosion resistance, chemical resistance, and high-temperature resistance to ensure the safe and reliable operation of the dialyzer during use.

[0005] PC: an abbreviation for polycarbonate, is a high-performance thermoplastic engineering plastic that is tough yet rigid, has good impact resistance, and produces molded parts with excellent dimensional accuracy and maintains dimensional stability over a wide temperature range.

[0006] Polyurethane adhesive: It is a mixture of two components, A and B, and is used to bond and fix the outer shell and membrane fibers.

[0007] Currently, the main structure of dialyzers in clinical practice consists of a hollow fiber membrane placed inside an outer shell, with both ends fixed with polyurethane adhesive. Blood flows through the inside of the hollow fiber membrane, while the dialysate flows in the opposite direction between the shell and the fiber membrane. Toxic molecules (large and small molecules) in the blood enter the dialysate through diffusion, ultrafiltration, adsorption, and convection, and are eventually eliminated from the body.

[0008] The dialysate connector is positioned vertically to the cylinder, which can easily create sharp points at its interface, leading to uneven wall thickness. In addition, the dialysate connector is connected to the dialysis tubing, and its complex structure causes inconsistent cooling rates during injection molding. The complex structure can also generate internal stress, reducing the strength of the dialysate connector and increasing the risk of breakage. Utility Model Content

[0009] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a dialyzer shell that can eliminate sharp points and enhance the strength of the dialysate connector.

[0010] The technical solution adopted by this utility model to solve its technical problem is as follows: The dialyzer shell includes a first cylinder, a second cylinder, a dialysate connector, reinforcing ribs, and a first boss. The first cylinder is disposed at both ends of the second cylinder. The dialysate connector and the first boss are both disposed on the outside of the first cylinder. The dialysate connector is disposed perpendicular to the axis of the first cylinder. The first boss is disposed protruding outward from the first cylinder. The first boss is located on the side of the dialysate connector near the port of the first cylinder. Multiple reinforcing ribs are disposed between the dialysate connector and the first cylinder. One of the reinforcing ribs is connected to the first boss, and the remaining reinforcing ribs are connected to the outer wall of the first cylinder by a circular arc transition.

[0011] Preferably, the diameter of the dialysate connector is 12~14mm, and the reinforcing rib includes a first reinforcing edge, a second reinforcing edge and a third reinforcing edge. The side away from the dialysate connector tube wall is the second reinforcing edge, and its width is 1.8~2.2mm. The first reinforcing edge and the third reinforcing edge are respectively set on both sides of the second reinforcing edge and connected to the tube wall of the dialysate connector. The included angle between the first reinforcing edge and the third reinforcing edge is 60°~80°.

[0012] Preferably, the width of the second reinforcing edge is 1.9~2.1mm.

[0013] Preferably, the width of the second reinforcing edge is 2mm.

[0014] Preferably, the angle between the first reinforcing edge and the third reinforcing edge is 65°~75°.

[0015] Preferably, the angle between the first reinforcing edge and the third reinforcing edge is 70°.

[0016] Preferably, the diameter of the dialysate connector is 12.5~13.5mm.

[0017] Preferably, the diameter of the dialysate connector is 13 mm.

[0018] Preferably, the diameter of the first cylinder is larger than the diameter of the second cylinder, the second cylinder extends into the first cylinder to form a flow guide ring, and a flow guide protrusion is provided on the side of the flow guide ring near the dialysate connector.

[0019] Preferably, it further includes an adhesive cavity, which is disposed on the inner side of both ends of the first cylinder. The inner diameter of the adhesive cavity is larger than the inner diameter of the first cylinder, and a second protrusion is provided at the end of the adhesive cavity near the first cylinder.

[0020] Compared with existing technologies, the beneficial effects of this technical solution are:

[0021] This utility model employs a dialyzer shell with a first boss on the outside of the first cylinder and multiple vertical reinforcing ribs between the dialysate connector and the outer wall of the first cylinder. One of the reinforcing ribs is connected to the first boss, and the remaining reinforcing ribs are connected to the outer wall of the first cylinder with an arc. This can eliminate sharp points, maintain uniform wall thickness at the root of the dialysate connector, reduce the generation of internal stress, and thus enhance the strength of the dialysate connector.

[0022] Furthermore, by improving the parameters of the reinforcing ribs, the diameter of the dialysate connector is 12~14mm, and the reinforcing ribs are provided with a first reinforcing edge, a second reinforcing edge, and a third reinforcing edge. The side away from the dialysate connector tube wall is the second reinforcing edge, and its width is 1.8~2.2mm. The first reinforcing edge and the third reinforcing edge connect the second reinforcing edge and the dialysate connector tube wall, and the included angle between the first reinforcing edge and the third reinforcing edge is 60°~80°, thereby enhancing the strength of the dialysate connector. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a dialyzer shell according to the present invention.

[0024] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0025] Figure 3 for Figure 1 A magnified view of a section at point B in the middle.

[0026] Among them: 1. First cylinder body 2. Second cylinder body 3. Dialysis fluid connector 4. Guide ring 5. Reinforcing rib 501, First reinforcing edge 502, Second reinforcing edge 503, Third reinforcing edge 6. First boss 7. Adhesion cavity 8. Guide protrusion 9. Second boss. Detailed Implementation

[0027] Figures 1-3 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-3 The present invention will be further described below.

[0028] Reference Figure 1The dialyzer housing includes a first cylinder 1, a second cylinder 2, a dialysate connector 3, a flow guide ring 4, a first boss 6, and reinforcing ribs 5 on the outer wall of the dialysate connector 3. Two first cylinders 1 are located at both ends of the second cylinder 2, with the diameter of the first cylinder 1 being larger than the diameter of the second cylinder 2. The second cylinder 2 extends into the first cylinder 1 to form the flow guide ring 4. A horizontal flow guide protrusion 8 is provided on the side of the flow guide ring 4 near the dialysate connector 3. Two dialysate connectors 3 are located perpendicular to the axis of the first cylinder 1 on the outer side of the first cylinder 1, and are designated as a dialysate inlet and a dialysate outlet as needed. A thread is also provided on the outer side of the first cylinder 1 between the first boss 6 and the port of the first cylinder 1 to connect the dialyzer end caps at both ends. This thread, combined with O-ring seals, ensures a tight structural fit.

[0029] The dialysate on the side closer to dialysate connector 3 has a shorter path to the hollow fiber membrane and lower pressure, while the dialysate on the side farther from dialysate connector 3 has a longer path and higher pressure. Since liquids flow to areas of lower pressure first, the dialysate on the side farther from dialysate connector 3 will flow slowly or not at all. This leads to a reduction in the diffusion and convection between blood and dialysate, and the dialysis membrane cannot perform to its full potential.

[0030] This invention features a horizontally oriented guide protrusion 8 on the side of the guide ring 4 near the dialysate connector 3, forming a shape where the side closer to the dialysate connector 3 is higher and the side farther away is lower. This ensures that the distance and time for the dialysate to reach the membrane fiber from the far end of the dialysate connector 3 are equal to the distance and time from the near end of the dialysate connector 3, enabling uniform distribution of the dialysate and enhancing the dialysis effect. When high-flow-rate dialysate enters through the dialysate connector 3 and directly contacts the membrane fiber, the membrane fiber may be flattened or broken due to the impact. The guide protrusion 8 can prevent the dialysate from directly affecting the membrane fiber, thus acting as a buffer.

[0031] Reference Figure 2 Since the dialysate connector 3 is a pair of cylindrical structures protruding from the first cylinder 1, sharp points are easily generated at the interface during its molding process, resulting in uneven interface wall thickness. This causes inconsistent cooling rates during injection molding, and internal stress is easily generated in complex parts, reducing the strength of the dialysate connector 3 and causing the connection between the dialysate connector 3 and the first cylinder 1 to break.

[0032] This invention features a first protrusion 6 circumferentially disposed on the outer wall of the first cylinder 1. The first protrusion 6 is adjacent to the side of the dialysate connector 3 near the port of the first cylinder 1. One of the reinforcing ribs 5 disposed between the dialysate connector 3 and the first cylinder 1 is connected to the first protrusion 6. This invention has four reinforcing ribs 5, with the remaining three ribs connected to the outer wall of the first cylinder 1 via a rounded transition. This rounded transition ensures uniform wall thickness of the dialysate connector 3, eliminates sharp points, and, through simulation, ensures that the molten PC reaches the root of the dialysate connector 3 at a consistent time, preventing the plastic that first enters the mold from remaining at the root of the dialysate connector 3. This ensures a relatively consistent cooling rate for the dialysate connector 3, reduces internal stress during injection molding, and thus enhances the strength of the root of the dialysate connector 3. Simultaneously, the connection to the first protrusion 6 also strengthens the root of the dialysate connector 3 and facilitates mold processing. The first protrusion 6 provides positioning during the production process.

[0033] Furthermore, this invention improves the parameters of the four reinforcing ribs 5, increasing their strength. The reinforcing rib 5 includes a first reinforcing edge 501, a second reinforcing edge 502, and a third reinforcing edge 503. The side furthest from the dialysate connector wall is the second reinforcing edge 502, with a width of 1.8~2.2mm. The first reinforcing edge 501 and the third reinforcing edge 503 are respectively located on both sides of the second reinforcing edge 502 and connected to the dialysate connector 3 wall. The included angle between the first reinforcing edge 501 and the third reinforcing edge 503 is 60°~80°. The reinforcing rib 5 is trapezoidal.

[0034] Experiments have shown that when the width of the second reinforcing edge 502 is 2mm and the angle between the first reinforcing edge 501 and the third reinforcing edge 503 is 70°, the structural stress of the dialysate connector 3 during injection molding can be effectively reduced, the bonding strength between the dialysate connector 3 and the outer wall of the first cylinder 1 can be enhanced, and the connection point can be prevented from breaking. When the width of the second reinforcing edge 502 is less than 2mm and the angle between the first reinforcing edge 501 and the third reinforcing edge 503 is less than 70°, the strength of the reinforcing rib 5 is too low, the stress at the contact point between the dialysate connector 3 and the outer shell is too high during injection molding, and the connection point can break. When the width of the second reinforcing edge 502 is greater than 2mm and the angle between the first reinforcing edge 501 and the third reinforcing edge 503 is greater than 70°, the shape of the dialysate connector 3 will be affected during molding, the shrinkage during injection molding will cause the dialysate port 3 to be elliptical, and the installation of the dialysate tubing will be affected. Therefore, when the width of the second reinforcing edge 502 is 2mm and the angle between the first reinforcing edge 501 and the third reinforcing edge 503 is 70°, the performance of the reinforcing rib 5 is optimal.

[0035] Reference Figure 3The first cylinder 1 has bonding cavities 7 at both ends on its inner side. The inner diameter of the bonding cavity 7 is larger than that of the first cylinder 1. A second protrusion 9 is provided at the port of the bonding cavity 7 near the first cylinder 1. The stepped bonding cavity 7 and the cavity surface of the second protrusion 9 are sanded. The sanded surface is relatively rough, which can increase the contact area between the first cylinder 1 and the polyurethane adhesive and improve its bonding effect. In addition, the polyurethane adhesive is subjected to an axial extrusion force from the O-ring and blood during the dialysis process. The second protrusion 9 can provide support for the polyurethane adhesive and provide an axial support force, which can balance the extrusion force formed during the dialysis process.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A dialyzer housing, characterized in that: The device includes a first cylinder (1), a second cylinder (2), a dialysate connector (3), reinforcing ribs (5), and a first boss (6). The first cylinder (1) is located at both ends of the second cylinder (2). The dialysate connector (3) and the first boss (6) are both located on the outside of the first cylinder (1). The dialysate connector (3) is set perpendicular to the axis of the first cylinder (1). The first boss (6) is set to protrude outward from the first cylinder (1). The first boss (6) is located on the side of the dialysate connector (3) near the port of the first cylinder (1). Multiple reinforcing ribs (5) are set between the dialysate connector (3) and the first cylinder (1). One of the reinforcing ribs (5) is connected to the first boss (6), and the remaining reinforcing ribs (5) are connected to the arc of the outer wall of the first cylinder (1).

2. The dialyzer housing according to claim 1, characterized in that: The diameter of the dialysate connector (3) is 12~14mm. The reinforcing rib (5) includes a first reinforcing edge (501), a second reinforcing edge (502) and a third reinforcing edge (503). The side away from the wall of the dialysate connector (3) is the second reinforcing edge (502), which has a width of 1.8~2.2mm. The first reinforcing edge (501) and the third reinforcing edge (503) are respectively set on both sides of the second reinforcing edge (502) and connected to the wall of the dialysate connector (3). The included angle between the first reinforcing edge (501) and the third reinforcing edge (503) is 60°~80°.

3. A dialyzer housing according to claim 2, characterized in that: The width of the second reinforcing edge (502) is 1.9~2.1mm.

4. A dialyzer housing according to claim 3, characterized in that: The width of the second reinforcing edge (502) is 2mm.

5. A dialyzer housing according to claim 2, characterized in that: The angle between the first reinforcing edge (501) and the third reinforcing edge (503) is 65°~75°.

6. A dialyzer housing according to claim 5, characterized in that: The angle between the first reinforcing edge (501) and the third reinforcing edge (503) is 70°.

7. A dialyzer housing according to claim 1, characterized in that: The diameter of the dialysate connector (3) is 12.5~13.5mm.

8. A dialyzer housing according to claim 7, characterized in that: The diameter of the dialysate connector (3) is 13 mm.

9. A dialyzer housing according to claim 1, characterized in that: The diameter of the first cylinder (1) is larger than the diameter of the second cylinder (2). The second cylinder (2) extends into the first cylinder (1) to form a flow guide ring (4). A flow guide protrusion (8) is provided on the side of the flow guide ring (4) near the dialysate connector (3).

10. A dialyzer housing according to claim 1, characterized in that: It also includes an adhesive cavity (7), which is located on the inner side of both ends of the first cylinder (1). The inner diameter of the adhesive cavity (7) is larger than the inner diameter of the first cylinder (1). A second boss (9) is provided at the end of the adhesive cavity (7) near the first cylinder (1).

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