A dry powder device for hemodiafiltration

Abstract

The present invention discloses a dry powder device for hemodialysis filtration, comprising a dry powder bag, a bracket and a cover body; the dry powder bag is made of disposable flexible material; the cover body has a nozzle at one end away from the dry powder bag, which is used to be connected to a liquid inlet pipe / liquid outlet pipe of a dialyzer; the cover body is welded to the top and bottom of the dry powder bag 4 respectively, so that the cover body and the dry powder bag are connected to form a chamber; sodium bicarbonate particles are placed in the chamber, which is used to make the liquid in the liquid inlet pipe flow through the cover body and the dry powder bag and then flow out from the liquid outlet pipe; the bracket is detachably connected to the cover body, which is used to longitudinally support the dry powder bag made of flexible material on the bracket, and assist the end of the cover body to be accurately connected to the dialyzer.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a dry powder device for hemodialysis filtration. Background Art

[0002] A hemodialysis device is generally composed of a dialysis machine, a hemodialysis filter, and a dialysis line. It is mainly used for the treatment of acute and chronic renal failure and toxic diseases. It uses the principle of a semipermeable membrane to exchange or excrete metabolic waste, excess water, and electrolytes in the patient's blood through diffusion, convection, and filtration, making the patient's internal environment close to that of a normal person, thereby achieving the purpose of purifying the blood.

[0003] At present, hemodialysis uses online B powder devices and A powder devices for hemodialysis and filtration. The online B powder device has solid sodium bicarbonate built in. When in use, water is injected from the inlet at the top, allowing the water to flow through the cartridge to dissolve the built-in sodium bicarbonate powder into a saturated sodium bicarbonate solution. Then, liquid is drawn from the outlet at the bottom and flows through the dialyzer, and then mixed with other dialysis solutions from the upstream of the dialyzer pipeline. Existing online B powder devices for dialysis and filtration are as follows: Figure 2 As shown, it comprises a barrel body 7 and a barrel cover 6. The barrel body and the barrel cover are injection molded by polypropylene. The barrel bottom is integrally molded with the barrel body. A filter sheet is arranged at the barrel bottom, but no filter sheet is arranged at the barrel cover.

[0004] CN202096520U discloses an online B powder device for hemodialysis and filtration, which consists of a barrel body, an upper cover, two upper and lower anti-overflow caps, a filter sheet, a PP sintered filter element, and large-particle sodium bicarbonate. The filter sheet is installed in the slot at the bottom of the barrel body, and a quantitative amount of sodium bicarbonate powder is filled in the barrel body as required. The upper cover is equipped with a PP sintered filter element, which is welded to the top of the barrel body by ultrasonic technology, and the liquid inlet and outlet pipes are covered with anti-overflow caps. However, the online B powder device is a disposable device with high production cost, which imposes a large economic burden on patients who need long-term dialysis.

[0005] Therefore, a low-cost online B powder device capable of realizing hemodialysis and filtration is considered. Summary of the invention

[0006] The object of the present invention is to provide a dry powder device for hemodialysis filtration, which changes the outer shell of the existing dry powder device into a structure with a flexible liner in a bracket, and the built-in dry powder bag and the cover body welded together are disposable, using inexpensive PE bags, and the bracket can be reused, thereby simply realizing the problem of reuse and low cost.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A dry powder device for hemodialysis filtration comprises a dry powder bag, a bracket and a cover body; the dry powder bag is made of disposable flexible material; the cover body has a nozzle at one end away from the dry powder bag for connecting with a liquid inlet pipe / liquid outlet pipe of a dialyzer, the cover body is welded to the top and bottom of the dry powder bag respectively, so that the cover body and the dry powder bag are connected to form a chamber, and sodium bicarbonate particles are placed in the chamber for allowing liquid in the liquid inlet pipe to flow through the cover body and the dry powder bag and then flow out from the liquid outlet pipe; the bracket is detachably connected to the cover body, and is used to longitudinally support the dry powder bag made of flexible material on the bracket, and to assist in accurately connecting the end of the cover body to the dialyzer.

[0009] The cover body comprises a sealing cap, an interface and a filter sheet arranged in sequence, the sealing cap is a hollow cylinder with a closed top, the inner contour of the sealing cap is adapted to the outer contour of the nozzle at the top of the interface, and is used to seal the nozzle of the interface; the interface is an integrally formed structure, comprising a nozzle, a first partition and a second partition connected in sequence from top to bottom, the nozzle, the first partition and the second partition have a vertically through channel inside, which is used to flow through the liquid from the dialyzer liquid inlet pipe; the nozzle is located at the top, and is used to connect the dialyzer liquid inlet pipe, the first partition is a hollow cylinder, and a slot is provided on its outer wall which is radially concave inward along the first partition; the circumference of the cross section of the second partition is not greater than the circumference of the opening of the dry powder bag;

[0010] The filter sheet is ultrasonically welded inside the interface, facing the channel inside the interface, and is used to filter the liquid flowing from the liquid inlet pipe through the filter sheet and the liquid flowing into the liquid outlet pipe;

[0011] The dry powder bag comprises two openings and a side bag body, and two opposite ends extending in the vertical direction of the side bag body have openings; the inner wall of the side bag body near the opening is used for hot-melt welding with the outer surface of the second partition;

[0012] The bracket includes an integrally formed support body and a wing plate, the length of the support body is adapted to the vertical space of the dialysis machine for placing online B powder; the support body has a long axis direction along its long side, and the two ends of the support body extend perpendicular to the long axis direction to form wing plates, and the wing plates are located on the same side of the main support body; the wing plate has a U-shaped opening, and the inner wall contour of the U-shaped opening is adapted to the outer contour of the slot of the interface, so as to position the wing plate of the bracket on the slot of the interface.

[0013] Furthermore, the cross-section of the second partition is designed to be an olive shape for easy welding.

[0014] Furthermore, the sieve hole diameter of the filter plate is 100-400 mesh.

[0015] Furthermore, the dry powder bag is made of polyethylene and has a thickness of 0.2 mm.

[0016] Furthermore, the inner wall of the side bag body is a welding area 10 mm from the opening toward the side bag body, which is used to hot-melt weld the welding area to the outer surface of the second partition of the interface.

[0017] Furthermore, the side bag body is formed by hot-melt welding two sides of two rectangular PE films to form a side bag body with two end openings, or a seamless, integrally formed annular structure.

[0018] Furthermore, the length of the support body is 210-220 mm.

[0019] Furthermore, the bracket is made of PP, PE or ABS material by integral injection molding, or is made of stainless steel sheet metal.

[0020] Furthermore, the supporting body is a plate-like structure, and a vertical groove is formed on the plate-like supporting body.

[0021] Furthermore, the support body is a plate-like structure, and vertical or horizontal reinforcing ribs are additionally provided on the plate-like support body to increase the support effect on the dry powder bag.

[0022] Optionally, the filter plate located on the upper cover body and the filter plate located on the lower cover body have different sieve hole diameters. The sieve hole diameter of the filter plate close to the liquid inlet pipe is 100 mesh, which is used to filter the liquid flowing through the filter plate from the liquid inlet pipe. The sieve hole diameter of the filter plate close to the liquid outlet pipe is 400 mesh, which is used to filter the liquid flowing into the liquid outlet pipe to prevent sodium bicarbonate particles from flowing into the liquid outlet pipe.

[0023] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0024] The dry powder bag of the device is welded to the cover body, and as a disposable medical device, it avoids contamination and is safe to use; and the two ends of the device are covers with the same structure, and there is no distinction between the upper and lower parts. When using, there is no need to distinguish between the upper and lower parts, which saves operation steps and can completely avoid the situation where the device is inverted due to operator error and contamination of dry powder;

[0025] The dry powder bag of the device adopts a cheap PE bag, and its bracket can be reused, which greatly controls the production cost, thereby easily realizing the problem of reuse and low cost;

[0026] At the same time, since the stent is smaller and has no cavity, it is easier to handle aseptically; and the space of the overall device is reduced, packaging is more convenient, and storage space is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1aIt is a schematic structural diagram of the dry powder device for hemodiafiltration according to the present invention; Figure 1b yes Figure 1a Exploded diagram of

[0028] Figure 2 The utility model is an existing dry powder device for hemodialysis filtration.

[0029] in,

[0030] 1: Sealing cap 2: Interface 3: Filter

[0031] 4: PE bag 5: bracket 21: nozzle

[0032] 22: First zone 23: Second zone 41: Welding area

[0033] 6: Cylinder cover 7: Cylinder body 51: Support body

[0034] 52: Wing plate 53: U-shaped opening DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme, beneficial effects and significant progress of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention is clearly and completely described below in combination with the drawings provided in the embodiments of the present invention. Obviously, all the described embodiments are only partial embodiments of the present invention, rather than all embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1a and 1b As shown, a dry powder device for hemodialysis filtration includes a dry powder bag 4, a bracket 5 and a cover. The cover is welded to the top and bottom of the dry powder bag 4, respectively, and the dry powder bag is made of flexible material; the cover has a nozzle at one end away from the dry powder bag 4, which is used to connect with the inlet pipe / outlet pipe of the dialyzer, and the cover is connected with the dry powder bag to allow the liquid in the inlet pipe to flow through the cover and the dry powder bag and then flow out from the outlet pipe; the bracket 5 is clamped with the cover to support the dry powder bag and assist the end of the cover to be accurately connected to the dialyzer, so as to accurately position the dry powder bag made of flexible material on the bracket longitudinally.

[0038] The two ends of the dry powder device of the present invention adopt the same structure of the cover body, without distinguishing the top and the bottom, which is different from Figure 2 The dry powder device of the prior art shown does not present the risk of being installed upside down.

[0039] The cover body includes a sealing cap 1, an interface 2 and a filter 3 arranged in sequence. The sealing cap 1 is a hollow cylinder with a closed top. The inner contour of the sealing cap 1 is adapted to the outer contour of the nozzle 21 at the top of the interface, and is used to sleeve the sealing cap 1 on the nozzle 21 at the top of the interface 2 to seal the nozzle of the interface 2; the interface 2 is an integrally formed structure, including a nozzle 21, a first partition 22 and a second partition 23 connected in sequence from top to bottom, and the nozzle 21, the first partition 22 and the second partition 23 have a vertically through channel inside for flowing through the liquid from the dialyzer inlet pipe. The nozzle 21 is located at the top and is used to connect the dialyzer inlet pipe. The first partition is a hollow cylinder, and a slot is opened on its outer wall that is radially concave inward along the first partition; the cross section of the second partition is olive-shaped, and the circumference of the cross section of the second partition is not greater than the circumference of the opening of the dry powder bag 4. The reason why the cross section of the second partition is selected as olive-shaped is to facilitate welding. Of course, a circle, an ellipse or other geometric shapes can also be selected.

[0040] The filter sheet 3 is ultrasonically welded inside the interface, i.e., at the bottom of the first partition, facing the channel inside the interface, and is used to filter the liquid flowing through the filter sheet 3 from the liquid inlet pipe and the liquid flowing into the liquid outlet pipe to prevent sodium bicarbonate particles from flowing into the liquid outlet pipe. The material of the filter sheet 3 is selected from nylon, PE or PP, and the sieve hole diameter is 100-400 mesh.

[0041] The dry powder bag 4 is a disposable PE bag made of polyethylene with a thickness of 0.2 mm. It contains granular crystalline sodium bicarbonate, but other solid forms can also be used. The dry powder bag includes two openings and a side bag body. The side bag body is formed by hot-melt welding two sides of two rectangular PE films to form a side bag body with two end openings. It can also be a seamless one-piece annular structure with openings at two opposite ends extending in the vertical direction of the side bag body. The inner wall of the side bag body is 10 mm from the opening to the side bag body, which is used to hot-melt weld the welding area 41 with the outer surface of the second partition 23 of the interface 2, so as to form a sealed environment between the interface and the dry powder bag 4 to avoid contamination.

[0042] The bracket includes an integrally formed support body 51 and a wing plate 52, the length of the support body is 210-220mm, which is adapted to the vertical space of the dialysis machine for placing online B powder, so that the nozzles of the interfaces at both ends of the device can be inserted into the dialysis machine and keep the dry powder bag 4 upright; the support body has a long axis direction along its long side, and the two ends of the support body extend perpendicular to the long axis direction to form wing plates 52, and the wing plates 52 are located on the same side of the main support body 51; the wing plate 52 has a U-shaped opening 53, and the inner wall contour of the U-shaped opening 53 is adapted to the outer contour of the slot of the interface 2, which is used to position the wing plate 52 of the bracket on the slot of the interface 2.

[0043] According to actual needs, the bracket is made of PP, PE or ABS material, or made of stainless steel sheet metal. The support body 51 is a plate-like structure. Optionally, in order to reduce the deadweight, vertical grooves can be opened on the plate-like support body 51; in order to increase the support effect on the dry powder bag, vertical or horizontal reinforcing ribs can also be additionally provided on the support body 51.

[0044] Optionally, the support body 51 may also be a frame structure, that is, a rectangular structure composed of four support tubes, and wing plates 52 extend along the long sides of the support tubes.

[0045] When in use, install the bracket in the slot on the interface, remove the sealing cap 1 at the end of the cover body, push the supporting body of the bracket into the position of the dialysis machine, and align the nozzle at the interface 2 with the liquid inlet and outlet pipes of the dialysis machine to complete the installation.

[0046] Example 2

[0047] The structure of the dry powder device for hemodiafiltration is similar to that of the dry powder device for hemodiafiltration described in Example 1, and will not be described in detail here. Only the differences are described below:

[0048] Since the filter sheet located on the upper cover is used to filter the inflowing water, and the filter sheet on the lower cover is used to filter the particles that may remain in the saturated solution in the dry powder bag to prevent them from entering the liquid outlet pipe, the filter sheets on the upper cover and the lower cover are set to have different sieve apertures. The specific strategies are as follows:

[0049] The sieve hole diameter of the filter plate 3 close to the liquid inlet pipe is 100 mesh, which is used to filter the liquid flowing through the filter plate from the liquid inlet pipe. The sieve hole diameter of the filter plate close to the liquid outlet pipe is 400 mesh, which is used to filter the liquid flowing into the liquid outlet pipe to prevent sodium bicarbonate particles from flowing into the liquid outlet pipe.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. The non-essential improvements, adjustments or replacements made by those skilled in the art based on the contents of this specification are all within the scope of protection required by the present invention.

Claims

1. A dry powder device for hemodiafiltration, characterized in that: The device comprises a dry powder bag (4), a bracket (5) and a cover body; the dry powder bag (4) is made of disposable flexible material; the cover body has a nozzle (21) at one end away from the dry powder bag (4) for connecting to a liquid inlet pipe / liquid outlet pipe of a dialysis machine, the cover body is welded to the top and bottom of the dry powder bag (4) respectively, and the two ends of the device are covers with the same structure, so that the cover body and the dry powder bag (4) are connected to form a chamber, and sodium bicarbonate particles are placed in the chamber to allow liquid in the liquid inlet pipe to flow through the cover body and the dry powder bag and then flow out from the liquid outlet pipe; the bracket (5) is detachably connected to the top and bottom of the cover body, and is used to longitudinally support the dry powder bag (4) made of flexible material on the bracket (5), and to assist the end of the cover body to be accurately connected to the dialysis machine; The cover body comprises a sealing cap (1), an interface (2) and a filter sheet (3) which are arranged in sequence. The sealing cap (1) is a hollow cylinder with a closed top. The inner contour of the sealing cap (1) is adapted to the outer contour of the nozzle (21) at the top of the interface and is used to seal the nozzle of the interface (2). The interface (2) is an integrally formed structure, comprising a nozzle (21), a first partition (22) and a second partition (23) which are connected in sequence from top to bottom. The nozzle (21), the first partition (22) and the second partition (23) have a vertically through passage inside for liquid from a dialyzer liquid inlet pipe to flow through. The nozzle (21) is located at the top and is used to connect to the dialyzer liquid inlet pipe. The first partition (22) is a hollow cylinder, and a groove is provided on its outer wall which is concave radially inwardly along the first partition (22). The circumference of the cross section of the second partition (23) is not greater than the circumference of the opening of the dry powder bag (4). The filter sheet (3) is ultrasonically welded inside the interface (2) and faces the channel inside the interface (2), and is used to filter the liquid flowing from the liquid inlet pipe through the filter sheet (3) and to filter the liquid flowing into the liquid outlet pipe; The dry powder bag (4) comprises two openings and a side bag body, wherein two opposite ends extending in the vertical direction of the side bag body have openings; the inner wall of the side bag body near the opening is used for hot-melt welding with the outer surface of the second partition (23); The support (5) comprises an integrally formed support body (51) and a wing plate (52), the length of the support body being adapted to the vertical space of the dialysis machine for placing the online B powder; the support body (51) having a long axis along its long side, the two ends of the support body (51) respectively extending in a direction perpendicular to the long axis to form wing plates (52), the wing plates (52) being located on the same side of the support body (51); the wing plate (52) having a U-shaped opening (53), the inner wall contour of the U-shaped opening (53) being adapted to the outer contour of the slot of the interface (2), for positioning the wing plate (52) of the support on the slot of the interface (2).

2. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The cross section of the second partition (23) is designed to be an olive-shaped structure that is convenient for welding.

3. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The sieve hole diameter of the filter plate (3) is 100-400 mesh.

4. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The dry powder bag (4) is made of polyethylene and has a thickness of 0.2 mm.

5. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The inner wall of the side bag body 10 mm from the opening in the direction of the side bag body is a welding area (41), which is used for hot-melt welding the welding area (41) to the outer surface of the second partition (23) of the interface (2).

6. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The side bag body is formed by hot-melting two sides of two rectangular PE films to form a side bag body with two end openings, or a seamless integrally formed annular structure.

7. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The bracket (5) is made of PP, PE or ABS material through integral injection molding, or is made of stainless steel sheet metal.

8. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The supporting body (51) is a plate-shaped structure, and vertical or horizontal reinforcing ribs are additionally arranged on the plate-shaped supporting body (51) to increase the supporting effect on the dry powder bag.

9. The dry powder device for hemodiafiltration according to claim 1, characterized in that: The filter sheet (3) located on the upper cover body and the filter sheet (3) located on the lower cover body have different sieve hole diameters. The sieve hole diameter of the filter sheet (3) close to the liquid inlet pipe is 100 meshes, and is used to filter the liquid flowing through the filter sheet (3) from the liquid inlet pipe. The sieve hole diameter of the filter sheet (3) close to the liquid outlet pipe is 400 meshes, and is used to filter the liquid flowing into the liquid outlet pipe, so as to prevent sodium bicarbonate particles from flowing into the liquid outlet pipe.

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