Novel hemodialyzer
By adopting PP material and ultrasonically welded bevel structure, combined with the raised part and sealing protrusion on the guide ring, the high cost, material risk and sealing problems of the hemodialyzer are solved, and a safer and more effective dialysis process is achieved.
Patent Information
- Application Number
- CN202422403185.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-09-30
AI Technical Summary
Existing hemodialyzers are expensive, contain materials that pose health risks, have unstable connections, and lack sealing, which affects patient health and user experience.
The shell and end cap are made of PP material, fixed with an ultrasonically welded inclined structure, the O-ring is eliminated, and a raised portion and a sealing protrusion are set on the guide ring to enhance the gathering and sealing of the dialysis membrane.
It reduces production costs, improves the sealing reliability and dialysis efficiency of the dialyzer, reduces blood retention volume, avoids membrane filament dispersion, and ensures the safety and stability of the dialysis process.
Smart Images
Figure CN223365973U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a novel hemodialyzer. Background Art
[0002] At present, the number of patients with kidney disease in China is increasing year by year, and the demand for hemodialysis machines is also gradually increasing. However, most domestic dialyzers are made of PC material and imported dialysis membranes. The dialyzers in the existing technology have the following problems: (1) The cost of dialyzers remains high, which increases the burden on patients; (2) There is a risk of bisphenol A precipitation in PC material, which affects the physical and mental health of patients. In addition, there is stress concentration during the injection molding process, and the product is more likely to be damaged after reaching the terminal; (3) The PC shell and the PC end cover are connected by threads, and vibration during transportation may cause the end cover to loosen; (4) In order to ensure the overall structural sealing of the dialyzer, a special O-ring needs to be placed in the PC end cover. Since it is made of polymer material, it will have an irritating effect on human blood. Utility Model Content
[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a new type of hemodialyzer that is safer, more effective and reduces production costs.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a new type of hemodialyzer, including an outer shell, an end cover, a dialysis membrane and a sealant. The outer shell is hollow, and a dialysate interface is provided on both end side walls of the outer shell. The dialysis membrane is arranged in the outer shell, and a guide ring is also provided on the inner wall of the end of the outer shell. A sealant is provided at the end of the dialysis membrane near the guide ring. The end cover is connected to the two ends of the outer shell. The end cover includes an integrally formed upper cover and a cover body. The cover body is cylindrical. The inner wall of the connection between the cover body and the upper cover is a shear welding surface. The shear welding surface is inclined. The inclination angle of the shear welding surface is 40°~50°. The shear welding surface is pressed tightly against the outer edge of the end face of the outer shell and fixed by ultrasonic welding. The outer shell and the end cover are both made of PP material.
[0005] Preferably, the inclination angle of the shear welding surface is 45°.
[0006] Preferably, a blood interface is provided in the middle of the upper cover, and a circle of sealing protrusions is provided on the inner wall of the upper cover protruding outward, and the sealing protrusions are embedded in the sealant.
[0007] Preferably, a plurality of liquid inlet channels are provided at intervals on the guide ring, and the liquid inlet channels are provided near an opening at one end of the end cover.
[0008] Preferably, the liquid flow area of the liquid inlet channel gradually increases from close to the dialysate interface to far away from the dialysate interface.
[0009] Preferably, protrusions are provided on both sides of the liquid inlet channel, and a plurality of protrusions are staggeredly provided in sequence along the length direction of the liquid inlet channel.
[0010] Preferably, the protrusion is arranged in a hook shape, and the end of the protrusion is bent toward the side away from the end cover, and the length of the protrusions gradually increases from away from the end cover to close to the end cover.
[0011] Preferably, a plurality of reinforcing ribs are provided on the outer wall of the dialysate interface close to the housing along the axial direction of the dialysate interface.
[0012] Preferably, the reinforcing ribs gradually widen from being away from the shell to being close to the shell.
[0013] Preferably, a circle of positioning bosses is provided on the outer wall of the end portion of the shell, and the positioning bosses are connected to one of the reinforcing ribs.
[0014] Compared with the existing technology, the above technical solution has the following beneficial effects:
[0015] 1. The dialyzer of the present invention includes a shell, an end cover, a dialysis membrane and a sealant. The shell and the end cover are made of PP material. The PP material has excellent chemical stability, is not easily corroded by chemicals such as acid, alkali, and salt, has good toughness, high tensile strength and impact resistance, and is not easy to break; the end cover includes an integrally formed upper cover and a cover body. The inner wall of the uppermost end of the cover body is a shear welding surface. The shear welding surface is inclined. The shear welding surface is pressed tightly against the outer edge of the shell end face and fixed by ultrasonic welding. The structure consists of an inclined surface structure and a 90° vertical surface structure of the shell. During the welding process, the 90° angle contacts the inclined surface first. Due to the linear contact, the ultrasonic energy can be well concentrated to achieve the purpose of rapid welding. Since ultrasonic welding uses high-speed vibration to make the two joints melt by friction, and then combine together after cooling, the molecules are intertwined to form molecular chains, which are very strong and can ensure the sealing reliability of the dialyzer. Therefore, the original O-ring can be eliminated. Since the O-ring is eliminated, the overall height of the blood chamber is reduced, thereby reducing the blood chamber capacity and the volume of blood retained in the blood chamber, so that the blood can smoothly enter the fiber membrane for dialysis.
[0016] 2. The utility model provides a raised portion on the guide ring, which can effectively gather the dialysis membranes at both ends and reduce the undesirable phenomenon of membrane filaments not passing blood due to the dispersion and deviation of the membrane filaments. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of the present utility model.
[0018] Figure 2 It is a structural schematic diagram of the end cover of the utility model.
[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0020] Figure 4 for Figure 2 Enlarged view of point B in the middle.
[0021] Among them: 1, outer shell 2, dialysis membrane 3, dialysate interface sealing plug 4, end cover 5, sealant 6, dialysate interface 7, blood interface 8, blood interface sealing plug 9, reinforcing rib 10, guide ring 11, liquid inlet channel 12, protrusion 1201, first protrusion 1202, second protrusion 1203, third protrusion 1204, fourth protrusion 13, positioning boss 14, shear welding surface 15, sealing protrusion. 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 Figures 1 and 2 As shown, a new type of hemodialyzer of the present invention includes a shell 1, an end cover 4, a dialysis membrane 2 and a sealant 5. The shell 1 is hollow, and a dialysate interface 6 is provided on the side walls at both ends of the shell 1. The two dialysate interfaces 6 serve as a dialysate inlet and a dialysate outlet, respectively. The dialysis membrane 2 is a dialysis membrane bundle composed of a plurality of fiber membranes. The dialysis membrane 2 is arranged in the shell 1, and a guide ring 10 is further provided on the inner wall of the end of the shell 1. A sealant 5 is provided near the guide ring 10 at the end of the dialysis membrane 2. The sealant 5 connects the end of the dialysis membrane 2 and one end of the guide ring 10. The dialysate passes through the guide ring 10 and enters the shell 1. The shell 1 and the end cover 4 are both made of PP material. The PP material has good toughness, high tensile strength and impact resistance.
[0024] like Figure 3As shown, the end caps 4 are connected to both ends of the shell 1. The end caps 4 include an integrally formed upper cover and a cover body. The cover body is cylindrical, and the inner wall of the uppermost end of the cover body is a shear welding surface 14. The shear welding surface 14 is inclined. The shear welding surface 14 is pressed tightly against the outer edge of the end face of the shell 1 and fixed by ultrasonic welding. The inclination angle of the shear welding surface 14 is 40°~50°. In this embodiment, the inclination angle of the shear welding surface 14 is 45°. The welding structure consists of a 45° inclined surface and a 90° vertical surface structure of the shell 1. During the welding process, the 90° outer edge of the shell 1 first contacts the 45° inclined surface as a linear contact, which can well concentrate the ultrasonic energy. Ultrasonic welding uses high-speed vibration to cause the two joints to generate heat and melt due to friction. After cooling, they are combined together to form a whole, which is very strong and can ensure the sealing reliability of the dialyzer. Therefore, the original O-ring can be eliminated. Due to the elimination of the O-ring, the height of the blood chamber is reduced, thereby reducing the blood chamber capacity and the volume of blood retained in the blood chamber, so that the blood can smoothly enter the fiber membrane for dialysis.
[0025] A blood interface 7 is provided in the middle of the upper cover. Both end caps 4 at both ends of the housing 1 are provided with blood interfaces 7. The blood interfaces 7 are cannula-shaped tubes with threads formed on the inner wall of the outer tube of the blood interfaces 7, which are connected to the external blood pipeline via the threads. The two blood interfaces 7 serve as the blood inlet and blood outlet, respectively. The direction of blood flow within the housing 1 is opposite to the direction of dialysate flow within the housing 1, i.e., the dialysate inlet of the dialysate interface 6 and the blood outlet of the blood interface 7 are at the same end, and the dialysate outlet of the dialysate interface 6 and the blood inlet of the blood interface 7 are at the same end. A sealing protrusion 15 is provided on the inner wall of the upper cover, protruding outward. The sealing protrusion 15 is embedded in the sealant 5. The sealing protrusion 15 is a conical structure with a cone tip angle of 30° to 60°. The height of the sealing protrusion 15 is 0.4mm to 0.5mm, and the height of the sealing protrusion 15 embedded in the sealant 5 is 0.2mm to 0.4mm.
[0026] A plurality of liquid inlet channels 11 are spaced apart on the guide ring 10. The liquid inlet channels 11 are opened at one end close to the end cover 4. The dialysate enters the housing through the plurality of liquid inlet channels 11. Since the flow rate of the dialysate is faster the closer it is to the dialysate interface 6, the diffusion and convection effects between the blood and the dialysate are reduced, which is not conducive to the full utilization of the dialysate. Therefore, in order to make the speed of the dialysate entering the housing 1 uniform, the liquid flow area of the liquid inlet channels 11 gradually increases from close to the dialysate interface 6 to away from the dialysate interface 6.
[0027] Protrusions 12 are provided on both sides of the liquid inlet channel 11. Several protrusions 12 are staggered in sequence along the length direction of the liquid inlet channel. Due to the provision of the liquid inlet channel 11, the length of the guide ring 10 is extended, and the guide ring 10 more effectively gathers the dialysis membranes 2 at both ends. At the same time, the protrusions 12 are inserted into the sealant 5, so that the dialysis membrane 2 is combined with the sealant 5 in a gathered state, making the combination tighter, preventing the membrane fibers from dispersing and separating from each other, and preventing the membrane fibers from bleeding.
[0028] like Figure 4 As shown, in this embodiment, the protrusion 12 is arranged in a hook shape, and the end of the protrusion 12 is bent toward the side away from the end cover, and the length of the protrusions 12 gradually increases from away from the end cover 4 to close to the end cover 4. Specifically, the raised portion 12 includes a first protrusion 1201, a second protrusion 1202, a third protrusion 1203 and a fourth protrusion 1204. The first protrusion 1201, the second protrusion 1202, the third protrusion 1203 and the fourth protrusion 1204 are arranged in sequence from far away from the end cover 4 to close to the end cover 4. The first protrusion 1201 and the third protrusion 1203 are arranged on the same side of the liquid inlet channel 11, and the second protrusion 1202 and the fourth protrusion 1204 are arranged on the same side of the liquid inlet channel 11. The first protrusion 1201, the second protrusion 1202, the third protrusion 1203 and the fourth protrusion 1204 are all arranged in a hook shape, and the protruding length gradually increases, and the depth of insertion into the sealant 5 gradually increases, so that the guide ring 10 and the sealant 5 are tightly combined.
[0029] Several reinforcing ribs 9 are provided along the axial direction of the dialysate interface 6 near the outer wall of the housing 1. The ribs 9 gradually widen from farther away from the housing 1 to closer to the housing 1. A circle of positioning bosses 13 are provided on the outer wall of the end of the housing 1. The positioning bosses 13 are connected to one of the reinforcing ribs 9 to strengthen the dialysate interface 6 and prevent breakage. When the dialyzer is not in use, the two dialysate interfaces 6 and the two blood interfaces 7 are respectively installed with dialysate interface sealing plugs 3 and blood interface sealing plugs 8 to prevent impurities from entering the dialyzer.
[0030] The outer shell 1 and the end cap 4 of the present invention are both made of PP material. PP material has excellent chemical stability, is not easily corroded by chemical substances such as acids, alkalis, and salts, has good toughness, high tensile strength and impact resistance, and is not easy to break. When the end cap 4 is installed on the outer shell 1, the shear welding surface of the uppermost end of the end cap 4 cover body is set at an angle, and the shear welding surface 14 is pressed tightly against the outer edge of the end face of the outer shell 1 and fixed by ultrasonic welding, which is very strong and can ensure the sealing reliability of the dialyzer. The length of the guide ring 10 is increased, which more effectively gathers the dialysis membranes 2 at both ends. At the same time, the protrusion 12 is inserted into the sealant 5, so that the dialysis membrane 2 is combined with the sealant in a gathered state, making the combination more compact, avoiding the dispersion and separation of the membrane filaments, and preventing the membrane filaments from bleeding.
[0031] 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 new type of hemodialyzer, characterized by: The invention comprises a shell (1), an end cover (4), a dialysis membrane (2) and a sealant (5), wherein the shell (1) is hollow, and a dialysis fluid interface (6) is provided on both end side walls of the shell (1), the dialysis membrane (2) is provided in the shell (1), and a guide ring (10) is provided on the inner wall of the end of the shell (1), and a sealant (5) is provided at the end of the dialysis membrane (2) near the guide ring (10), and the end cover (4) is connected to both ends of the shell (1), and the end cover (4) comprises an upper cover and a cover body formed in one piece, the cover body is cylindrical, and the inner wall of the connection between the cover body and the upper cover is a shear welding surface (14), the shear welding surface (14) is inclined, and the inclination angle of the shear welding surface (14) is 40°~50°, and the shear welding surface (14) is pressed tightly against the outer edge of the end face of the shell (1) and welded and fixed, and the shell (1) and the end cover (4) are both made of PP material.
2. A novel hemodialyzer according to claim 1, characterized in that: The inclination angle of the shear welding surface (14) is 45°.
3. A novel hemodialyzer according to claim 1, characterized in that: A blood interface (7) is provided in the middle of the upper cover, and a circle of sealing protrusions (15) is provided on the inner wall of the upper cover protruding outward, and the sealing protrusions (15) are embedded in the sealant (5).
4. A novel hemodialyzer according to claim 1, characterized in that: A plurality of liquid inlet channels (11) are provided at intervals on the guide ring (10), and the liquid inlet channels (11) are provided near an opening at one end of the end cover (4).
5. A novel hemodialyzer according to claim 4, characterized in that: The liquid flow area of the liquid inlet channel (11) gradually increases from close to the dialysate interface (6) to far away from the dialysate interface (6).
6. A novel hemodialyzer according to claim 4, characterized in that: Protrusions (12) are provided on both sides of the liquid inlet channel (11), and a plurality of protrusions (12) are staggered and arranged in sequence along the length direction of the liquid inlet channel (11).
7. A novel hemodialyzer according to claim 6, characterized in that: The protrusion (12) is arranged in a hook shape, and the end of the protrusion (12) is bent toward a side away from the end cover, and the protruding length of the plurality of protrusions (12) gradually increases from away from the end cover (4) to close to the end cover (4).
8. A novel hemodialyzer according to claim 1, characterized in that: A plurality of reinforcing ribs (9) are provided on the outer wall of the dialysate interface (6) close to the housing (1) along the axial direction of the dialysate interface (6).
9. A novel hemodialyzer according to claim 8, characterized in that: The reinforcing rib (9) gradually widens from being away from the shell (1) to being close to the shell (1).
10. A novel hemodialyzer according to claim 8, characterized in that: A circle of positioning bosses (13) is provided on the outer wall of the end of the housing (1), and the positioning bosses (13) are connected to one of the reinforcing ribs (9).