Modularized hollow fiber membrane dialysis unit

Abstract

The utility model discloses a modularized hollow fiber membrane dialysis unit, which belongs to the technical field of dialyzers and comprises a cylinder and a membrane wire mounting part. The upper and lower sides of the cylinder are provided with a dialysate inlet and a dialysate outlet, and the two ends of the cylinder are fixedly connected with an upper connector and a lower connector which are respectively connected with end covers with a blood inlet and a blood outlet; the connector is circumferentially provided with a stepped hole and a limiting nail, the membrane wire mounting piece comprises a packaging piece and an annular inner pressing piece, one side of the packaging piece is provided with a cutting part, the other side of the packaging piece is provided with a positioning groove, the circumferential direction of the packaging piece is provided with a limiting groove matched with the limiting nail, and the inner pressing piece is in threaded connection with the connector and is movably sealed with the cutting part. In the design, the membrane tows and the packaging pieces can be sealed and prefabricated in batches in advance, the dialysis unit does not need to be integrally replaced during replacement, the dialysis unit can be rapidly replaced by disassembling the end cover, the inner pressing piece and the limiting nail, and the maintenance time is greatly shortened; positioning of the packaging piece is achieved through the limiting structure, stable sealing is formed through threaded pressing of the inner pressing piece, and dialysis safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dialyzer technical field, concretely is a kind of modularization hollow fiber membrane dialysis unit. BACKGROUND

[0002] Hollow fiber membrane dialysis unit is as the core equipment of hemodialysis treatment, with its membrane silk high specific surface area, excellent selectivity and high efficiency material exchange capacity, has been widely used in the clinical treatment of chronic kidney disease and other diseases.With the development of medical technology, clinical dialysis equipment reliability, use convenience and cost control are proposed higher requirements, especially in primary medical institutions and long-term dialysis scene, equipment maintenance efficiency and use cost directly influence treatment continuity and patient burden.Currently, mainstream dialysis unit mostly adopts integrated structure design, membrane silk bundle as core function component, its assembly process and main structure are closely associated, become the key link to guarantee dialysis effect.

[0003] The membrane silk bundle of existing hollow fiber membrane dialysis unit is usually integrally filled with glue and packaged or fixedly connected with main structure such as cylinder, connector, and has high structural integration.This design can ensure initial sealing performance, but membrane silk bundle is prone to cause dialysis efficiency to decline due to pollution, aging or physical damage in long-term use, and due to lack of independent disassembly structure, damaged membrane silk bundle cannot be replaced alone, and the whole dialysis unit needs to be scrapped and replaced.This not only leads to long equipment maintenance period, affects clinical treatment scheduling, but also causes a large amount of effective structure to be wasted, significantly increases the procurement cost of medical institutions and the treatment burden of patients, and is difficult to meet the actual needs of clinical low-cost and high-efficiency maintenance. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of modularization hollow fiber membrane dialysis unit, to solve the following technical problems proposed in background art:

[0005] The membrane silk bundle and main structure in existing dialysis unit have high integration, cannot be replaced alone, lead to the whole dialysis unit to be replaced when membrane silk bundle is aged or damaged, cause long maintenance time and high use cost.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0007] The utility model provides a modular hollow fiber membrane dialysis unit, including cylinder and membrane silk mounting spare, the upper and lower sides of cylinder are provided with dialysate inlet and dialysate outlet respectively, and the both ends of cylinder are respectively fixed with upper connector and lower connector, and the upper connector is connected with upper end cover, and the upper end cover is connected with blood inlet, and the lower connector is connected with lower end cover, and the lower end cover is connected with blood outlet, and a plurality of step holes are arranged on the upper connector and the lower connector along the circumferential direction, and the step hole is provided with limiting nail, and one end of limiting nail extends into the upper connector or the lower connector, and the membrane silk mounting spare is arranged in the upper connector and the lower connector, and the membrane silk mounting spare includes encapsulation and inner pressure spare, and one side of encapsulation is provided with cutting part, and the other side is provided with positioning groove, and the circumferential direction of encapsulation is provided with limiting groove, and one end of limiting nail is connected in limiting groove, and the inner pressure spare is annular structure, and the inner pressure spare is connected with the upper connector or the lower connector through screw thread, and the inner pressure spare is movably and sealingly connected with cutting part.

[0008] Further, the dialysate inlet, the dialysate outlet, the blood inlet and the blood outlet all adopt quick plug connectors.

[0009] Further, the upper end cover is connected with the upper connector through screw thread, and the lower end cover is connected with the lower connector through screw thread.

[0010] Further, the encapsulation is gap fitted with the cylinder.

[0011] Further, the slot of the positioning groove of the encapsulation is chamfered.

[0012] Further, an end face sealing groove is arranged on the end face of one end of the encapsulation close to the cutting part, and a sealing washer is arranged in the end face sealing groove.

[0013] Further, a side face sealing groove is arranged on the inner side of the inner pressure spare, and a sealing ring is arranged in the side face sealing groove.

[0014] Further, a connecting wall is fixed on the outer side of the inner pressure spare, and the connecting wall is connected with the upper connector or the lower connector through screw thread.

[0015] Further, an unlocking plate is fixed on the inner side of the connecting wall.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] Through the design of the utility model, the encapsulation and the membrane silk bundle can be prefabricated in batches in advance, and when the membrane silk bundle is aged or damaged, the dialysis unit does not need to be replaced as a whole, only the end cover, the inner pressure spare and the limiting nail need to be disassembled, and the prefabricated membrane silk and encapsulation assembly can be quickly replaced, so that the maintenance time is greatly shortened and the use cost is reduced. The design realizes accurate positioning of the encapsulation through cooperation of the limiting nail and the limiting groove, avoids axial displacement, the threaded compression structure of the inner pressure spare forms stable sealing, effectively prevents blood and dialysate from flowing together, and guarantees the safety of the dialysis process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of the upper connector portion of this utility model;

[0020] Figure 3 for Figure 2 Enlarged schematic diagram of part A;

[0021] Figure 4 This is a structural schematic diagram of the internal pressure component of this utility model;

[0022] Figure 5 This is a schematic diagram of the packaging component of this utility model.

[0023] The markings in the diagram are: 1-Cylinder body, 2-Lower connector, 3-Lower end cap, 4-Blood outlet, 5-Dialysis fluid inlet, 6-Dialysis fluid outlet, 7-Blood inlet, 8-Upper end cap, 9-Upper connector, 10-Limiting groove, 11-Limiting pin, 12-Stepped hole, 13-Internal pressure component, 14-Connecting wall, 15-Positioning groove, 16-Unlocking plate, 17-Cutting part, 18-Encapsulation component, 19-Side sealing groove, 20-Sealing ring, 21-Sealing gasket, 22-End face sealing groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example:

[0026] A modular hollow fiber membrane dialysis unit includes a cylindrical body and membrane fiber mounting components, such as... Figure 1 As shown, the upper and lower sides of the cylinder 1 are respectively provided with a dialysate inlet 5 and a dialysate outlet 6. An upper connector 9 and a lower connector 2 are fixed to both ends of the cylinder 1, respectively. The upper connector 9 is connected to an upper end cap 8, which is connected to a blood inlet 7. The lower connector 2 is connected to a lower end cap 3, which is connected to a blood outlet 4. Figure 2As shown, the upper connector 9 and the lower connector 2 are both provided with a plurality of stepped holes 12 in the circumferential direction, and the stepped holes 12 are provided with 2-6, preferably 4. The stepped holes 12 are provided with a limiting pin 11, and one end of the limiting pin 11 extends into the upper connector 9 or the lower connector 2. The membrane filament mounting member is arranged in the upper connector 9 and the lower connector 2. The membrane filament mounting member includes an encapsulating member 18 and an internal pressure member 13. As shown, Figure 5 As shown, one side of the encapsulating member 18 is provided with a cutting part 17, and the other side is provided with a positioning groove 15. The encapsulating member 18 is circumferentially provided with a limiting groove 10, and one end of the limiting pin 11 is connected in the limiting groove 10. As shown, Figure 4 As shown, the internal pressure member 13 is a ring structure, and the internal pressure member 13 is threadedly connected with the upper connector 9 or the lower connector 2, and the internal pressure member 13 is movably and sealingly connected with the cutting part 17.

[0027] Among them, the cylinder body 1 is the core bearing component, not only provides installation space for the membrane filament bundle, but also constitutes the dialysate flow channel, and the dialysate inlets 5 and the dialysate outlets 6 on the upper and lower sides are respectively responsible for the introduction and discharge of the dialysate.

[0028] The upper connector 9 and the lower connector 2 are respectively fixedly connected to the two ends of the cylinder body 1, which are used for connecting the upper end cover 8 and the lower end cover 3, and providing installation reference for the membrane filament mounting member, and the stepped holes 12 arranged in the circumferential direction are the installation carriers of the limiting pins 11; the upper end cover 8 and the lower end cover 3 are connected with the connectors, on the one hand to protect the internal connecting structure, and on the other hand to guide the blood to enter and exit through the blood inlets 7 and the blood outlets 4, so as to realize the closed guidance of the blood flow channel.

[0029] The limiting pin 11 is installed in the stepped hole 12, and the axial positioning of the encapsulating member 18 is realized by embedding the limiting pin 11 in the limiting groove 10 of the encapsulating member 18, so as to prevent the displacement of the encapsulating member 18 due to fluid impact during use. The encapsulating member 18 is the fixed core of the membrane filament bundle, the positioning groove 15 is used for accommodating the end part of the membrane filament bundle to provide space for encapsulation, the cutting part 17 is treated to expose the end part of the membrane filament to ensure fluid communication, and the limiting groove 10 and the limiting pin 11 are matched to realize positioning. The internal pressure member 13 adopts a ring structure, and the axial pressure is generated by the threaded connection with the connector, so as to tightly press the encapsulating member 18 to realize sealing, and at the same time, the fluid passage is not blocked; the membrane filament bundle is the core functional component of dialysis, and the hollow structure provides a flow channel for blood, and the material exchange between blood and dialysate is realized through the selective permeability of the membrane.

[0030] In use, first, the membrane filament bundle is pretreated: the hollow fiber membrane filament bundle with a length meeting the requirement is cut, and the two ends thereof are respectively inserted into the positioning grooves 15 of the two encapsulating members 18, so as to ensure that the end part of the membrane filament bundle is tightly fitted with the inner wall of the positioning groove 15.

[0031] Then, the sealing operation is performed: medical grade epoxy resin glue is selected, and the glue solution is slowly poured into the positioning groove 15, and air bubbles are removed by slight vibration during the process to ensure that the glue solution completely fills the gap between the membrane fiber bundle and the positioning groove 15. Then, the packaging piece 18 is placed in a clean environment at 25-30°C for curing for 24 hours, and the fixation and sealing of the membrane fiber bundle and the packaging piece 18 are completed.

[0032] After curing, the cutting part 17 of the packaging piece 18 is planed by using a precise grinding device until the hollow end of the membrane fiber bundle is completely exposed, and it is ensured that the blood can smoothly enter the inside of the membrane fiber bundle.

[0033] The two packaging pieces 18 with the assembled membrane fiber bundle are respectively loaded into the cylinder 1 at both ends and moved to the installation position corresponding to the upper and lower connectors, and the limiting nails 11 are loaded one by one along the stepped hole 12, so that one end of the limiting nail 11 is embedded into the limiting groove 10 of the packaging piece 18, and the axial fixation of the packaging piece 18 is realized.

[0034] The inner pressure piece 13 is screwed into the threaded hole of the connector, the cutting part 17 is tightly pressed by the annular end face of the inner pressure piece 13, and the movable seal is formed by using pressure to block the flow of blood and dialysate.

[0035] Finally, the upper end cover 8 and the lower end cover 3 are fixed, and the overall assembly is completed.

[0036] In use, the blood enters the upper connector 9 through the blood inlet 7 of the upper end cover 8, flows into the hollow channel of the membrane fiber through the exposed membrane fiber end of the cutting part 17, and finally flows out from the blood outlet 4 of the lower end cover 3; the dialysate enters the inner cavity of the cylinder 1 through the dialysate inlet 5 of the cylinder 1, flows in the flow channel between the outer wall of the membrane fiber bundle and the inner wall of the cylinder 1, and is discharged from the dialysate outlet 6, and the exchange of toxins, water and other substances between the blood and the dialysate is completed through the selective permeability of the membrane fiber, and the dialysis function is realized.

[0037] Using this design, the glue sealing fixation of the membrane fiber bundle and the packaging piece 18 can be prefabricated in batches in advance, when the membrane fiber bundle is aged or damaged, the dialysis unit does not need to be replaced as a whole, only the end cover, the inner pressure piece 13 and the limiting nail 11 need to be disassembled, and the prefabricated membrane fiber and packaging piece 18 assembly can be quickly replaced, which greatly shortens the maintenance time and reduces the use cost. This design realizes precise positioning of the packaging piece 18 through cooperation of the limiting nail 11 and the limiting groove 10, avoids axial displacement, the threaded compression structure of the inner pressure piece 13 forms a stable seal, effectively prevents the flow of blood and dialysate, and guarantees the safety of the dialysis process. In a preferred embodiment, the dialysate inlet 5, the dialysate outlet 6, the blood inlet 7 and the blood outlet 4 all adopt quick plug connectors.

[0038] In a preferred embodiment, the dialysate inlet 5, the dialysate outlet 6, the blood inlet 7 and the blood outlet 4 are all provided with quick connectors. The quick connectors can realize the quick plugging and unplugging of the dialysate and blood pipelines, without the need for additional tools, shorten the pipeline assembly and disassembly time, adapt to the modular maintenance requirements, while ensuring the sealing reliability of the pipeline connection to prevent fluid leakage and improve the operation convenience and dialysis process safety.

[0039] In a preferred embodiment, the upper end cover 8 is threadedly connected with the upper connector 9, and the lower end cover 3 is threadedly connected with the lower connector 2. The thread connection realizes the stable assembly of the upper end cover 8 and the upper connector 9, and the lower end cover 3 and the lower connector 2, enhances the sealing property of the connection to prevent blood leakage, and facilitates the quick disassembly and assembly of the end cover, provides operation convenience for the maintenance and replacement of the internal membrane filament assembly, and adapts to the modular design requirements.

[0040] In a preferred embodiment, the packaging member 18 is clearance fitted with the barrel 1. The clearance fitting of the packaging member 18 with the barrel 1 can reduce the assembly resistance, facilitate the quick assembly and disassembly of the membrane filaments and the packaging member 18 into or out of the barrel 1, avoid interference with the inner wall of the barrel 1 during assembly, does not affect the positioning of the limiting peg 11 and the sealing effect of the internal pressure member 13, and adapts to the modular assembly and disassembly requirements.

[0041] In a preferred embodiment, as shown in Figure 2 , the slot opening of the positioning groove 15 of the packaging member 18 is provided with a chamfer. The chamfer provided at the slot opening of the positioning groove 15 of the packaging member 18 can guide the quick insertion of the membrane filament bundle into the positioning groove 15 and avoid the sharp edges of the slot opening scratching the membrane filaments.

[0042] In a preferred embodiment, as shown in Figure 3 , an end face sealing groove 22 is provided on the end face of the packaging member 18 close to the cutting portion 17, and a sealing gasket 21 is arranged in the end face sealing groove 22. The end face of the packaging member 18 close to the cutting portion 17 is provided with the end face sealing groove 22 and the sealing gasket 21 is arranged therein, which forms a double sealing with the pressing force of the internal pressure member 13, further blocks the flow channel of the blood and dialysate, improves the sealing reliability, the sealing groove can limit the displacement of the gasket, and does not affect the modular assembly and disassembly convenience.

[0043] In a preferred embodiment, as shown in Figure 3 , the inner side of the internal pressure member 13 is provided with a side sealing groove 19, and a sealing ring 20 is arranged in the side sealing groove 19. The inner side of the internal pressure member 13 is provided with the side sealing groove 19 and the sealing ring 20 is arranged therein, which realizes the positioning and displacement prevention of the sealing ring 20 in cooperation with the sealing groove, forms a lateral sealing with the inner wall of the connector, constitutes a multiple sealing structure with the end face sealing, further blocks the flow of the blood and dialysate, improves the overall sealing reliability, and does not affect the disassembly of the internal pressure member 13 and the modular maintenance efficiency.

[0044] In a preferred embodiment, as shown inFigure 2 and Figure 4 As shown in the figure, the outer side of the inner pressure piece 13 is fixedly connected with a connecting wall 14, and the connecting wall 14 is threadedly connected with the upper connecting head 9 or the lower connecting head 2. The connecting wall 14 fixedly connected with the outer side of the inner pressure piece 13 serves as a threaded connection carrier, and when threadedly matched with the upper connecting head 9 or the lower connecting head 2, the stress is more uniform, the deformation of the inner pressure piece 13 can be avoided, the stability of the sealing structure is guaranteed, meanwhile, the connecting wall 14 is designed not to interfere with the disassembly and assembly operation, and the modular maintenance requirement is adapted, and the reliability of assembly and compression is further improved. Further optimization, the inner side of the connecting wall 14 is fixedly connected with an unlocking plate 16, and the unlocking plate 16 can conveniently rotate the connecting wall 14 and the inner pressure piece 13.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screw connection" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning of the above-mentioned terms in the present application according to the specific situation.

[0047] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A modular hollow-fiber membrane dialysis unit, characterized by: The application relates to a dialysis machine, which comprises a cylinder (1) and a membrane filament mounting piece, the upper and lower sides of the cylinder (1) are respectively provided with a dialysis liquid inlet (5) and a dialysis liquid outlet (6); the two ends of the cylinder (1) are respectively fixedly connected with an upper connecting head (9) and a lower connecting head (2), the upper connecting head (9) is connected with an upper end cover (8), the upper end cover (8) is connected with a blood inlet (7), the lower connecting head (2) is connected with a lower end cover (3), and the lower end cover (3) is connected with a blood outlet (4); A plurality of stepped holes (12) are arranged on the upper connecting head (9) and the lower connecting head (2) in the circumferential direction, a limiting pin (11) is arranged at the stepped hole (12), and one end of the limiting pin (11) extends into the upper connecting head (9) or the lower connecting head (2); the membrane filament mounting piece is arranged in the upper connecting head (9) and the lower connecting head (2); The membrane filament mounting piece comprises an encapsulating piece (18) and an inner pressure piece (13), one side of the encapsulating piece (18) is provided with a cutting part (17), and the other side is provided with a positioning groove (15); a limiting groove (10) is arranged on the periphery of the encapsulating piece (18), and one end of the limiting pin (11) is connected in the limiting groove (10) in a matched mode; the inner pressure piece (13) is in an annular structure, the inner pressure piece (13) is threadedly connected with the upper connecting head (9) or the lower connecting head (2), and the inner pressure piece (13) is movably and sealingly connected with the cutting part (17).

2. A modular hollow-fiber membrane dialysis unit according to claim 1, characterized in that: The dialysis liquid inlet (5), the dialysis liquid outlet (6), the blood inlet (7) and the blood outlet (4) adopt quick plug connectors.

3. The modular hollow-fiber membrane dialysis unit of claim 1, wherein: The upper end cover (8) is threadedly connected with the upper connecting head (9), and the lower end cover (3) is threadedly connected with the lower connecting head (2).

4. The modular hollow-fiber membrane dialysis unit of claim 1, wherein: The encapsulating piece (18) is in clearance fit with the cylinder (1).

5. The modular hollow-fiber membrane dialysis unit of claim 1, wherein: The opening of the positioning groove (15) of the encapsulating piece (18) is provided with a chamfer.

6. The modular hollow-fiber membrane dialysis unit of claim 1, wherein: An end face sealing groove (22) is arranged on the end face of one end of the encapsulating piece (18) close to the cutting part (17), and a sealing ring (20) is arranged in the end face sealing groove (22).

7. The modular hollow-fiber membrane dialysis unit of claim 1, wherein: The inner side of the inner pressure piece (13) is provided with a side sealing groove (19), and a sealing ring (20) is arranged in the side sealing groove (19).

8. The modular hollow-fiber membrane dialysis unit of claim 1, wherein: The outer side of the inner pressure piece (13) is fixedly connected with a connecting wall (14), and the connecting wall (14) is threadedly connected with the upper connecting head (9) or the lower connecting head (2).

9. A modular hollow-fiber membrane dialysis unit according to claim 8, characterized in that: The inner side of the connecting wall (14) is fixedly connected with an unlocking plate (16).

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