Dry powder cylinder for dialysis

Abstract

The dry powder cylinder for dialysis comprises a cylinder body, a sealing cover arranged at the top end of the cylinder body in a covering mode and a filter piece arranged in the cylinder body, the sealing cover comprises a cover body part and a filter element part, the cover body part is provided with a liquid inlet channel, the filter element part is located in the liquid inlet channel, and the circumferential outer edge of the filter element part is integrally connected with the circumferential inner wall of the liquid inlet channel; a liquid outlet channel is arranged at the bottom end of the cylinder body, the filter piece comprises a filter piece part, a connecting part vertically extending outwards from the circumferential outer edge of the filter piece part, and a clamping part extending outwards in the radial direction of the filter piece part from one end, far away from the filter piece part, of the connecting part, and a plurality of filter holes are formed in the filter piece part; the plurality of filter holes are uniformly formed at intervals around the center of the filter disc part, and the filter disc is clamped with the circumferential inner wall, right above the liquid outlet channel, in the cylinder body through the clamping part. In addition, the sealing cover and the filtering piece are both manufactured through the integrated injection molding technology, the production technology is simplified, the production cost and the use cost are reduced, and the treatment burden of a patient can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a dry powder cartridge for dialysis. Background Technology

[0002] In the medical field, hemodialysis is one of the renal replacement therapies for patients with acute and chronic renal failure. The dry powder cartridge is a key piece of equipment in hemodialysis. It is a container used to hold dialysis dry powder and is usually used in conjunction with a dialysis machine. Through the automatic control system of the dialysis machine, dialysis water is injected into the dry powder cartridge and mixed with the dialysis dry powder to generate concentrated dialysis solution for output to meet clinical needs.

[0003] Currently, dry powder cartridges for hemodialysis mainly consist of a cartridge body and a cap on top of the cartridge body. The bottom of the cartridge body has a concentrate outlet, and the cap has a dialysis water inlet. Filter accessories are usually installed at the dialysis water inlet and the concentrate outlet to remove tiny impurities and bacteria from the liquid, ensuring that the purity of the input dialysis water and output concentrate meets clinical requirements. Specifically, existing dry powder cartridges for hemodialysis usually have a sintered filter element welded to the dialysis water inlet on the cap. A filter plate with multiple 5mm filter holes is placed above the concentrate outlet at the bottom of the cartridge body, and a filter membrane is added to the filter plate to improve the filtration effect. To ensure the stability of the filter membrane on the filter plate, the filter membrane and filter plate are usually welded together by ultrasonic welding before being installed into the cartridge body.

[0004] However, the manufacturing processes for sintered filter elements and membranes are complex, and the cost of raw materials is relatively high, leading to an increase in the overall cost of dry powder cartridges for hemodialysis. This increases the treatment burden on patients. Furthermore, the welding quality of the sintered filter element cap and the welding quality of the membrane onto the filter sheet directly affect the sealing performance of the dry powder cartridge, potentially causing dialysate leakage, severely impacting dialysis effectiveness, and even damaging the entire dialysis equipment. Therefore, there is an urgent need to develop a new type of dry powder cartridge for dialysis. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a dry powder cartridge for dialysis, aiming to solve the technical problems of the complex manufacturing process of the sintered filter element and filter membrane installed in the existing dry powder cartridge for dialysis, the relatively high cost of raw materials, which leads to an increase in the overall cost of the dry powder cartridge for hemodialysis, increasing the treatment burden on patients. Moreover, the welding quality of the sintered filter element on the cap and the welding quality of the filter membrane on the filter sheet directly affect the sealing performance of the dry powder cartridge, which may lead to dialysis fluid leakage, seriously affecting the dialysis effect and even damaging the entire dialysis equipment.

[0006] The purpose of this utility model is to provide a dry powder cartridge for dialysis, including a cartridge body, a cap on the top of the cartridge body, and a filter sheet disposed inside the cartridge body. The cap includes a cover part and a filter element part. The cover part is provided with a liquid inlet channel. The filter element part is located inside the liquid inlet channel, and the circumferential outer edge of the filter element part is integrally connected to the circumferential inner wall of the liquid inlet channel.

[0007] The bottom end of the cylinder is provided with a liquid outlet channel. The filter includes a filter part, a connecting part extending vertically outward from the circumferential outer edge of the filter part, and a snap-fit ​​part extending radially outward from one end of the connecting part away from the filter part. The filter part is provided with a plurality of filter holes, which are evenly spaced around the center of the filter part. The filter is snapped into the circumferential inner wall of the cylinder located directly above the liquid outlet channel through the snap-fit ​​part.

[0008] Compared to existing technologies, the advantages of this utility model's dialysis dry powder cartridge are as follows: The cap and filter element in this application are both manufactured using an integrated injection molding process, simplifying the production process and significantly reducing the production and usage costs of the dialysis dry powder cartridge, thus helping to reduce the treatment burden on patients. Specifically, the cap is an integrated design of the cap body and filter element, allowing the cap itself to have a filtering function without the need for additional welding and sintering of the filter element; the filter element has multiple filter holes, which have excellent filtering effects, eliminating the need for additional welding of the filter membrane and effectively avoiding the impact of the welding quality of the sintered filter element on the cap and the welding quality of the filter membrane on the filter element on the performance of the dry powder cartridge.

[0009] In addition, the dialysis dry powder cartridge according to the present invention may also have the following additional technical features:

[0010] Furthermore, the filter element is provided with a plurality of first reinforcing ribs, the first reinforcing ribs being annular structures, and the plurality of first reinforcing ribs being radially and evenly spaced along the center of the filter element to form a plurality of annular grooves. The cross-section of the annular groove is trapezoidal, and the large end opening of the annular groove is located near the inlet end of the liquid inlet channel, and the small end opening of the annular groove is located near the outlet end of the liquid inlet channel.

[0011] Furthermore, the filter element portion is also provided with at least two second reinforcing ribs. The second reinforcing ribs are arranged radially along the filter element portion. In the axial direction of the filter element portion, the two ends of the second reinforcing ribs extend beyond the two ends of the first reinforcing ribs, and the total height of the second reinforcing ribs is consistent with the thickness of the filter element portion.

[0012] Furthermore, the filter holes are arranged radially along the filter element portion, with one end of the filter hole located near the center of the filter element portion and the other end located near the circumferential outer edge of the filter element portion.

[0013] Furthermore, the cross-section of the filter hole is trapezoidal, the large end of the filter hole is located on the side of the filter element that is connected to the connecting part, and the small end of the filter hole is located on the side of the filter element that is away from the connecting part.

[0014] Furthermore, the width of the large end opening of the filter hole is 0.5mm-0.7mm, and the width of the small end opening of the filter hole is 0.07mm-0.13mm.

[0015] Furthermore, the end of the snap-fit ​​portion away from the connecting portion is bent towards the filter element portion, and in the axial direction of the filter element, the plane of the end face of the snap-fit ​​portion away from the connecting portion is lower than the plane of the side of the filter element portion connected to the connecting portion.

[0016] Furthermore, a plurality of support ribs are provided on the circumferential inner wall of the cylinder near the liquid outlet channel. The plurality of support ribs are evenly spaced around the center line of the liquid outlet channel. The end of the support rib away from the liquid outlet channel is used to abut against the side of the snap-fit ​​portion opposite to the filter element portion to support the filter element.

[0017] Furthermore, a limiting ring is provided on the circumferential inner wall of the cylinder located directly above the liquid outlet channel. When the filter is placed on the multiple support ribs, the end face of the snap-fit ​​part away from the connecting part is located directly below the limiting ring.

[0018] Furthermore, the dialysis dry powder cartridge also includes a first cap and a second cap, wherein the first cap is adapted to the inlet channel to close the inlet channel, and the second cap is adapted to the outlet channel to close the outlet channel. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the dialysis dry powder cartridge of this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle;

[0021] Figure 3 This is a three-dimensional structural view of the sealing cap in the dialysis dry powder cartridge of this utility model from a first perspective.

[0022] Figure 4 for Figure 3 Enlarged view of the structure at point B;

[0023] Figure 5 This is a three-dimensional structural view of the sealing cap in the dialysis dry powder cartridge of this utility model from a second perspective.

[0024] Figure 6 for Figure 5 Enlarged view of the structure at point C;

[0025] Figure 7 This is a cross-sectional view of the sealing structure of the dialysis dry powder cartridge of this utility model;

[0026] Figure 8 This is a three-dimensional structural diagram of the filter element in the dialysis dry powder cartridge of this utility model from a first-view perspective.

[0027] Figure 9 This is a three-dimensional structural view of the filter element in the dialysis dry powder cartridge of this utility model from a second perspective.

[0028] Figure 10 This is a cross-sectional view of the filter element in the dialysis dry powder cartridge of this utility model.

[0029] The above-mentioned figures include the following reference numerals: 10-cylinder; 11-support rib; 12-limiting ring; 101-liquid outlet channel; 20-cap; 21-cap body; 211-cap welding line; 22-filter element; 221-first reinforcing rib; 222-second reinforcing rib; 201-liquid inlet channel; 202-annular groove; 30-filter plate; 31-filter plate part; 32-connecting part; 33-clamping part; 301-filter hole; 40-first cap; 50-second cap.

[0030] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0031] To facilitate understanding of this utility model, a more complete description of it will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figures 1 to 10 The image shows a dialysis dry powder cartridge of the present invention, including a cartridge body 10, a cap 20 covering the top of the cartridge body 10, and a filter 30 disposed inside the cartridge body 10. In this embodiment, the cap 20 is provided with an inlet channel 201 for introducing dialysis water, and the cap 20 is provided with at least one cap welding line 211 for welding to the top end face of the cartridge body 10, so as to achieve a stable connection between the cap 20 and the cartridge body 10 and effectively ensure the airtightness of the entire dry powder cartridge.

[0035] As an example, the cap 20 includes a cap body 21 and a filter element 22. The cap body 21 has a liquid inlet channel 201 in its center and an annular receiving groove on its circumference. The annular receiving groove is adapted to the end face of the top of the cylinder 10, and an annular sealing welding line 211 is provided within the annular receiving groove. The filter element 22 is located inside the liquid inlet channel 201, and its outer circumferential edge is integrally connected to the inner circumferential wall of the liquid inlet channel 201. Specifically, in this embodiment, the filter element 22 is located in the central region along the axial direction of the liquid inlet channel 201. Furthermore, the filter element 22 is provided with a plurality of first reinforcing ribs 221. The first reinforcing ribs 221 are annular structures. The plurality of first reinforcing ribs 221 are radially and evenly distributed along the center of the filter element 22 to form a plurality of annular through grooves 202. The cross-section of the annular through grooves 202 is trapezoidal. The large end opening of the annular through grooves 202 is located near the inlet end of the liquid inlet channel 201, and the small end opening of the annular through grooves 202 is located near the outlet end of the liquid inlet channel 201.

[0036] Furthermore, the width of the large end opening of the annular through groove 202 is 0.3mm-0.5mm, and the width of the small end opening of the annular through groove 202 is 0.07mm-0.13mm. As a specific example, in this embodiment, the width of the large end opening of the annular through groove 202 is 0.4mm, and the width of the small end opening of the annular through groove 202 is 0.1mm.

[0037] Furthermore, the filter element portion 22 is also provided with at least two second reinforcing ribs 222. The second reinforcing ribs 222 are arranged radially along the filter element portion 22. In the axial direction of the filter element portion 22, the two ends of the second reinforcing ribs 222 extend beyond the two ends of the first reinforcing ribs 221, and the total height of the second reinforcing ribs 222 is consistent with the thickness of the filter element portion 22. As a specific example, in this embodiment, the filter element portion 22 is provided with two second reinforcing ribs 222, and the two second reinforcing ribs 222 are perpendicular to each other.

[0038] As an example, the filter element 30 includes a filter element portion 31, a connecting portion 32 extending vertically outward from the circumferential outer edge of the filter element portion 31, and a snap-fit ​​portion 33 extending radially outward from one end of the connecting portion 32 away from the filter element portion 31. The filter element portion 31 is provided with a plurality of filter holes 301, which are evenly spaced around the center of the filter element portion 31. The filter element 30 is snapped into the circumferential inner wall of the cylinder 10 located directly above the liquid outlet channel 101 by the snap-fit ​​portion 33. Furthermore, the filter holes 301 are arranged radially along the filter element portion 31, with one end of the filter hole 301 located near the center of the filter element portion 31 and the other end located near the circumferential outer edge of the filter element portion 31. In other words, the filter holes 301 are formed by extending linearly from the center of the filter element portion 31 toward the circumferential outer edge of the filter element portion 31. Furthermore, the cross-section of the filter hole 301 is trapezoidal, with the large end opening of the filter hole 301 located on the side of the filter element 31 connected to the connecting part 32, and the small end opening of the filter hole 301 located on the side of the filter element 31 away from the connecting part 32.

[0039] Furthermore, the width of the large end opening of the filter hole 301 is 0.5mm-0.7mm, and the width of the small end opening of the filter hole 301 is 0.07mm-0.13mm. As a specific example, in this embodiment, the width of the large end opening of the filter hole 301 is 0.6mm, and the width of the small end opening of the filter hole 301 is 0.1mm.

[0040] Furthermore, the end of the snap-fit ​​portion 33 away from the connecting portion 32 is bent toward the filter portion 31, and in the axial direction of the filter 30, the plane of the end face of the snap-fit ​​portion 33 away from the connecting portion 32 is lower than the plane of the side of the filter portion 31 connected to the connecting portion 32.

[0041] Furthermore, the cap 20 and filter 30 in the dialysis dry powder cartridge of this application are both manufactured using an integral injection molding process, and both the cap 20 and filter 30 are made of PP material.

[0042] As an example, the inner wall of the cylinder 10 near the liquid outlet channel 101 is provided with multiple support ribs 11. The support ribs 11 are evenly spaced around the center line of the liquid outlet channel 101. The end of the support rib 11 away from the liquid outlet channel 101 is used to abut against the side of the snap-fit ​​part 33 opposite to the filter element part 31 to support the filter element 30. Furthermore, the inner wall of the cylinder 10 located directly above the liquid outlet channel 101 is provided with a limiting ring 12. When the filter element 30 is placed on the multiple support ribs 11, the end face of the snap-fit ​​part 33 away from the connecting part 32 is located directly below the limiting ring 12. Through the cooperation of the support ribs 11 and the limiting ring 12, the filter element 30 can be stably limited to the liquid outlet channel 101 at the bottom of the cylinder 10, which can effectively prevent the filter element 30 from tilting during use and ensure the normal use of the filter element 30.

[0043] As an example, the dialysis dry powder cartridge of this application also includes a first cap 40 and a second cap 50, wherein the first cap 40 is adapted to the inlet channel 201 to close the inlet channel 201, and the second cap 50 is adapted to the outlet channel 101 to close the outlet channel 101.

[0044] In practical use, the working principle of the dialysis dry powder cartridge of this utility model is as follows: First, remove the first cap 40 on the inlet channel 201, and then introduce dialysis water into the cartridge body 10 through the inlet channel 201. Specifically, the dialysis water will flow in from the inlet end of the inlet channel 201, and sequentially pass through the large end opening and the small end opening of the annular groove 202 on the filter core 22, and finally flow into the cartridge body 10 from the outlet end of the inlet channel 201 to mix with the dialysis dry powder contained inside the cartridge body 10 to form a concentrated solution. After the dialysis water has been filled, the first cap 40 can be put back on the inlet channel 201 to seal the inlet channel 201 and prevent impurities from entering the cartridge body 10 and contaminating the concentrated solution. After the concentrate is mixed, the second cap 50 on the outlet channel 101 can be removed, allowing the concentrate to flow out of the outlet channel 101 to the outside of the cylinder 10. Specifically, the concentrate inside the cylinder 10 will flow in from the small end opening of the filter hole 301, then flow out from the large end opening of the filter hole 301 to the inlet end of the outlet channel 101, and finally reach the outside of the cylinder 10 through the outlet end of the outlet channel 101 at the bottom of the cylinder 10, thereby realizing the output of the concentrate.

[0045] In summary, the beneficial effects of this utility model's dialysis dry powder cartridge are as follows: The cap and filter element in this application are both manufactured using an integrated injection molding process, simplifying the production process and significantly reducing the production and usage costs of the dialysis dry powder cartridge, thus helping to reduce the treatment burden on patients. Specifically, the cap is an integrated design of the cap body and filter element, allowing the cap itself to have a filtering function, eliminating the need for additional welding and sintering of the filter element; the filter element has multiple filter holes, which have excellent filtering effects, eliminating the need for additional welding of the filter membrane, effectively avoiding the impact of the welding quality of the sintered filter element on the cap and the welding quality of the filter membrane on the filter element on the performance of the dry powder cartridge.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A dry powder cartridge for dialysis, characterized by, The device includes a cylindrical body, a cap covering the top of the cylindrical body, and a filter element disposed inside the cylindrical body. The cap includes a cover portion and a filter element portion. The cover portion is provided with a liquid inlet channel. The filter element portion is located inside the liquid inlet channel, and the circumferential outer edge of the filter element portion is integrally connected to the circumferential inner wall of the liquid inlet channel. The bottom end of the cylinder is provided with a liquid outlet channel. The filter includes a filter part, a connecting part extending vertically outward from the circumferential outer edge of the filter part, and a snap-fit ​​part extending radially outward from one end of the connecting part away from the filter part. The filter part is provided with a plurality of filter holes, which are evenly spaced around the center of the filter part. The filter is snapped into the circumferential inner wall of the cylinder located directly above the liquid outlet channel through the snap-fit ​​part.

2. The dry powder cartridge for dialysis according to claim 1, characterized by The filter element is provided with a plurality of first reinforcing ribs, which are annular structures. The plurality of first reinforcing ribs are evenly spaced radially along the center of the filter element to form a plurality of annular grooves. The cross-section of the annular groove is trapezoidal, and the large end opening of the annular groove is located near the inlet end of the liquid inlet channel, while the small end opening of the annular groove is located near the outlet end of the liquid inlet channel.

3. The dry powder cartridge for dialysis according to claim 2, characterized in that, The filter element portion is further provided with at least two second reinforcing ribs. The second reinforcing ribs are arranged radially along the filter element portion. In the axial direction of the filter element portion, the two ends of the second reinforcing ribs extend beyond the two ends of the first reinforcing ribs, and the total height of the second reinforcing ribs is consistent with the thickness of the filter element portion.

4. The dry powder cartridge for dialysis according to claim 1, characterized by, The filter holes are arranged radially along the filter element portion, with one end of the filter hole located near the center of the filter element portion and the other end located near the circumferential outer edge of the filter element portion.

5. The dry powder cartridge for dialysis according to claim 4, characterized in that, The cross-section of the filter hole is trapezoidal. The large end of the filter hole is located on the side of the filter element that is connected to the connecting part, and the small end of the filter hole is located on the side of the filter element that is away from the connecting part.

6. The dialysis dry powder cartridge according to claim 5, characterized in that, The width of the large end opening of the filter hole is 0.5mm-0.7mm, and the width of the small end opening of the filter hole is 0.07mm-0.13mm.

7. The dry powder cartridge for dialysis according to claim 1, characterized by The end of the snap-fit ​​portion away from the connecting portion is bent toward the filter element portion, and in the axial direction of the filter element, the plane of the end face of the snap-fit ​​portion away from the connecting portion is lower than the plane of the side of the filter element portion connected to the connecting portion.

8. The dry powder cartridge for dialysis according to claim 7, characterized in that, Multiple support ribs are provided on the circumferential inner wall of the cylinder near the liquid outlet channel. The multiple support ribs are evenly spaced around the center line of the liquid outlet channel. The end of the support rib away from the liquid outlet channel is used to abut against the side of the snap-fit ​​part opposite to the filter part to support the filter.

9. The dry powder cartridge for dialysis according to claim 8, characterized in that, A limiting ring is provided on the circumferential inner wall of the cylinder located directly above the liquid outlet channel. When the filter is placed on the multiple support ribs, the end face of the snap-fit ​​part away from the connecting part is located directly below the limiting ring.

10. The dialysis dry powder cartridge according to claim 1, characterized in that, The dry powder cartridge for dialysis further comprises a first cap and a second cap, wherein the first cap is adapted to the liquid inlet channel for closing the liquid inlet channel, and the second cap is adapted to the liquid outlet channel for closing the liquid outlet channel.

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