Universal protective cap for hemodialyzer and hemodialyzer

Abstract

The universal protective cap is characterized by comprising an end cover, the top of the end cover extends towards the opening direction of the end cover to form an annular wall, the periphery of the annular wall is provided with a first contact face, the annular wall further extends towards the opening direction of the end cover to form a protrusion, the protrusion is provided with a second contact face, and the second contact face is provided with a first contact face and a second contact face. The ring wall and the protrusion are made of elastic materials, the ring wall can be sleeved with the dialysate connector, the first contact face is in interference clamping connection with the circumferential face of an inner hole of the dialysate connector, the protrusion can be arranged in a blood chamber connector, and the second contact face is in sealed connection with an inner hole of the blood chamber connector. The device can be commonly used at the blood chamber connector and the dialysate connector, and the good dustproof effect of the blood chamber connector and the good airtight sealing effect of the dialysate connector side are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a universal protective cap for a hemodialyzer and a hemodialyzer. Background Art

[0002] Hemodialyzer, also known as dialyzer for short, is a pipe and container for solute exchange between blood and dialysate, and is a key part of hemodialysis. Dialyzers are usually composed of hollow fiber bundles, hollow cylinders, sealing rings, encapsulating rubber layers, end caps, and protective caps. Protective caps usually refer to cap structures installed at the inlet and outlet of the blood chamber and the inlet and outlet of the dialysate.

[0003] Due to the different requirements for the flow rate or flow rate of blood and dialysate, the calibers of the axial port (i.e., blood chamber interface) and the radial port (i.e., dialysate interface) of the dialyzer cylinder are slightly different. Therefore, the manufacturer needs to design different protective caps for the blood chamber interface and dialysate interface of the dialyzer. In order to reduce the number of molds and reduce production costs, some manufacturers design the protective caps of the blood chamber interface and the dialysate interface to be the same, and the two are universal. The material is usually polypropylene, so the sealing effect is average, and it can only cover the interface and prevent dust, but cannot make the interface airtight.

[0004] In addition, the study found that medical staff should pre-flushed the dialyzer before using it to remove gas and impurities inside the dialyzer. During pre-flushing, saline flows into the inner cavity of the cylinder from the blood chamber interface at the upper end of the dialyzer, and then flows out from the blood chamber interface at the lower end. During this process, since the protective cap at the dialysate interface does not have an airtight sealing effect, the saline in the cylinder will overflow from the dialysate interface, wet the ground, and in serious cases affect the effect of pre-flushing exhaust.

[0005] Therefore, there is an urgent need to provide a protective cap that can not only provide an airtight seal for the dialysate interface of the dialyzer, but also be used for the blood chamber interface and the breathable liquid interface of the dialyzer. Utility Model Content

[0006] The utility model provides a universal protective cap for a hemodialyzer and a hemodialyzer, which can be universally used at a blood chamber interface and a dialysate side, while ensuring that the blood chamber interface has a good dustproof effect and the dialysate interface side has a good airtight sealing effect.

[0007] The present application provides a universal protective cap for a hemodialyzer, characterized in that it includes an end cover, an annular wall extending from the top of the end cover in the direction of the opening of the end cover, a first contact surface being provided on the outer periphery of the annular wall, a protrusion also extending from the annular wall in the direction of the end cover opening, the protrusion being provided with a second contact surface, the annular wall and the protrusion being made of elastic material, the dialysate interface being sleeved outside the annular wall, the first contact surface being interference fit with the circumferential surface of the inner hole of the dialysate interface, the protrusion being placed in the blood chamber interface, the second contact surface being in close contact or interference fit with the inner hole of the blood chamber interface.

[0008] Furthermore, the end cover includes a peripheral wall and an end wall, the peripheral wall is sleeved on the outer periphery of the annular wall, one end of the end wall is connected to the peripheral wall, and the other end is connected to the annular wall.

[0009] Furthermore, the ring wall includes an outer ring and a transverse surface closely connected to the circumference of the outer ring, the protrusion is arranged on the lower bottom surface of the transverse surface, the first contact surface is arranged on the outer circumference of the outer ring, and the outer ring, the transverse surface and the protrusion are made of soft rubber material.

[0010] Furthermore, the end wall and the annular wall are integrally formed.

[0011] Furthermore, the peripheral wall is made of hard rubber material.

[0012] Furthermore, the outer diameter of the outer ring gradually decreases in the direction of the end cover opening, and the outer diameter of the outer ring is at least partially larger than the inner diameter of the dialysate interface.

[0013] Furthermore, a plurality of ribs are arranged at intervals on the inner circumferential surface of the circumferential wall, and a limit block protruding toward the axial direction of the annular wall is arranged above the ribs on the inner circumferential surface of the circumferential wall, and the limit block is provided with vertical edges along the axial direction of the circumferential wall and transverse edges perpendicular to the vertical edges, wherein the vertical edges and the outer circumferential wall of the outer ring form a groove, and the groove width matches the thickness of the end wall of the dialysate interface, and when the protective cap is matched with the dialysate interface, the end wall of the dialysate interface can be embedded in the groove, so that the limit block produces radial extrusion on the dialysate interface through the vertical edges, further ensuring the interference fit and clamping of the annular wall and the dialysate interface, and in addition, the transverse edges are used to abut against the end face of the blood chamber interface when the protective cap is matched with the blood chamber interface, to ensure that the protective cap is installed in place.

[0014] Furthermore, the center of the protrusion coincides with the center of the outer ring.

[0015] Furthermore, a connection hole is provided on the outer periphery of the top end of the peripheral wall, and a fixing column facing the peripheral wall is provided at a position of the end wall corresponding to the hole, and the fixing column can be embedded in the connection hole.

[0016] The present application also provides a hemodialyzer, characterized in that it includes the above-mentioned universal protective cap for the hemodialyzer.

[0017] The beneficial effects brought about by the technical solutions provided in some embodiments of the present application include at least: through the protrusion made of elastic material, the protrusion and the inner hole of the blood chamber interface can be matched and sealed to ensure the sealing of the blood chamber interface; through the annular wall made of elastic material, the outer peripheral surface of the annular wall and the inner hole of the dialysate interface are interference fit and clamped, which not only makes the protective cap compatible with the blood chamber interface and the dialysate side, but also ensures good dustproof effect of the blood chamber interface and good airtight sealing effect on the dialysate interface side. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Attached Figure 1 This is a schematic diagram of the first axial section structure of this embodiment;

[0020] Attached Figure 2 This is a schematic diagram of the second axial section structure of this embodiment;

[0021] Attached Figure 3 is a reverse structural schematic diagram of this embodiment;

[0022] Attached Figure 4 This is a schematic diagram of the front view structure of this embodiment;

[0023] Attached Figure 5 FIG. 2 is a schematic diagram of the installation structure of this embodiment.

[0024] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings. When describing the embodiments of the present invention in detail, for the sake of convenience, the drawings showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. It should be noted that the drawings are simplified in form and use non-precise proportions, which are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention. It should be noted that the connection mentioned in this application can be a direct connection or an indirect connection.

[0026] like Figure 1-5As shown, this embodiment provides a universal protective cap for a hemodialyzer, including a peripheral wall 1, an annular wall 2 and an end wall 3. The peripheral wall 1 is provided with an upper port and a lower port. The annular wall 2 includes an outer ring 21 and a transverse surface 22 which is in close contact with the inner periphery of the outer ring. The axial section of the outer ring 21 and the transverse surface 22 in the annular wall 2 is in an "H" shape. The peripheral wall 1 is sleeved on the outer periphery of the annular wall 2. One end of the end wall 3 is connected to the upper port of the peripheral wall 1, and the other end is in close contact with the upper end surface of the annular wall 2. Specifically, the other end of the end wall 3 is in close contact with the inner periphery of the outer ring. The top surface of the outer ring 21 is in close contact; the outer periphery of the ring wall 2 is provided with a first contact surface, and a protrusion is extended on the ring wall toward the end cover opening. Specifically, the protrusion is provided on the lower bottom surface of the transverse surface 22, and the protrusion is provided with a second contact surface. The peripheral wall 2 wraps the outer wall of the blood chamber interface 4. The ring wall 2 and the protrusion are made of elastic material. The protrusion 23 can be in close contact or interference fit with the inner hole of the blood chamber interface 4 through the second contact surface. It should be noted that the close contact here can be just abutting or sticking. The ring wall 2 can be tightened with the inner hole of the dialysate interface 5 through interference fit through the first contact surface thereon.

[0027] In some embodiments, the peripheral wall 1 is cylindrical, and the outer periphery of the cylindrical peripheral wall 1 may be provided with a plurality of convex strips 11 and other regular or irregular shaped convex strips or other structures, forms of convex blocks, etc. that increase the friction of hand grip. In the present embodiment, the outer periphery of the peripheral wall 1 is provided with spaced regular strip-shaped convex strips arranged along the axial direction of the peripheral wall 1, and an opening 12 is provided at the lower end of the peripheral wall 1, which is the entrance of the blood chamber interface 4 or the dialysate interface 5.

[0028] In some embodiments, the peripheral wall 1 can be made of hard rubber material, while the annular wall 2 and the protrusion 23 are made of soft rubber material. However, the peripheral wall is not limited to hard rubber material. In actual use, the peripheral wall 1 can be made of a non-elastic material or the same soft material as the annular wall. The hard rubber material has a certain elasticity, but compared with the soft rubber material, the elasticity of the hard rubber material is not as great as that of the soft rubber material. When the peripheral wall 1 is made of hard rubber material, it can be easily molded and shaped, and it is also convenient to connect with other components.

[0029] In some embodiments, the end wall 3 and the annular wall 2 are integrally formed. When integrally formed, the annular wall 2 can be formed by injection molding the end wall 3 from the top downward. The other end of the peripheral wall 1 has an opening 12 of a protective cap, and the blood chamber interface 4 or the dialysate interface 5 can be connected through the opening 12.

[0030] In some embodiments, part of the outer diameter of the annular wall 2, or at least the outer diameter where the first contact surface is located, is slightly larger than the inner diameter of the dialysate interface 5. The first contact surface of the annular wall 2 can be interference fit with the inner hole of the dialysate interface 5. Since the annular wall 2 is made of soft rubber material and has elasticity, the annular wall 2 is compressed and deformed during the interference fit, thereby achieving the effect of airtight sealing of the dialysate interface 5.

[0031] In some embodiments, a plurality of ribs 13 are arranged at intervals on the inner circumference of the peripheral wall 1. The ribs 13 can reduce the contact area, prevent the peripheral wall 1 from being too tight with the blood chamber interface 4 or the dialysate interface 5, and in addition, the amount of interference fit can be increased when the tightness of the fit is appropriate, thereby reducing the loosening of the protective cap caused by the deviation of the injection molding size and the normal aging of the product.

[0032] In summary, the ribs 13 can be provided on the inner circumferential surface of the peripheral wall 1 in combination with the annular wall 2 made of soft rubber material to achieve an airtight seal on the dialysate interface 5 .

[0033] In some embodiments, a limit block 14 protruding toward the axial direction of the annular wall 2 is further provided on the inner circumferential surface of the circumferential wall 1 and located above the rib 13. The limit block 14 is provided with a vertical edge 141 along the axial direction of the circumferential wall 1 and a horizontal edge 142 perpendicular to the vertical edge, wherein a groove 143 is formed between the vertical edge 141 and the outer circumferential wall of the outer ring 21, and the groove width matches the thickness of the end wall of the dialysate interface 5. When the protective cap is matched with the dialysate interface 5, the end wall of the dialysate interface 5 can be embedded in the groove 143. In this way, the limit block 14 produces radial extrusion on the dialysate interface 5 through the vertical edge, further ensuring that the annular wall 2 and the dialysate interface 5 are interference fit and clamped. In addition, the horizontal edge 142 is used to abut against the end face of the blood chamber interface 4 when the protective cap is matched with the blood chamber interface 4, to ensure that the protective cap is installed in place.

[0034] In some embodiments, the limit block 14 can extend axially from the rib 13 on the inner surface of the peripheral wall 1 to the top of the adjacent end wall 3, and bulge to form a plurality of right-angle limit blocks convex toward the axis of the annular wall 2, and the horizontal edge 142 and the vertical edge 141 are perpendicular to each other. The limit block with a right-angle structure not only realizes the function of cooperating, abutting and clamping between the peripheral wall and the blood chamber interface and the dialysate interface, but also has a simple and durable structure.

[0035] In addition, in some embodiments, the outer diameter of the outer ring 21 gradually decreases in the direction of the end cap opening. The outer ring 21 and the dialysate interface 5 have an appropriate degree of tightness, and can be assembled in place without too much force during assembly, and can be disassembled without too much force during disassembly, which is convenient to use and improves customer experience.

[0036] In some embodiments, the outer diameter of the outer ring 21 can be adjusted accordingly according to the size of the dialysate interface 5 to ensure that the outer ring 21 forms a suitable amount of compression when squeezed and to ensure sealing, so that the protective cap will not be too tight to be pulled out due to excessive interference fit.

[0037] In some embodiments, the protrusion 23 is a hemispherical protrusion, the center of the ball coincides with the axis of the annular wall 2, the aperture of the hemispherical protrusion 23 is not less than the inner hole of the blood chamber interface 4, and can be interference fit with the inner hole of the blood chamber interface 4, so that the connection is tighter and a sealed dustproof is formed. Specifically, when the protective cap is matched with the blood chamber interface 4, the hemispherical protrusion is stuck into the inner hole of the blood chamber interface 4 to form a sealed dustproof; the inner diameter of the hemispherical protrusion can be adjusted appropriately and is slightly larger than the inner hole of the blood chamber interface 4. When the protective cap is matched with the blood chamber interface 4, since the end wall 3 and the hemispherical protrusion are made of soft rubber material, the end wall 3 is pressed vertically downward, and the hemispherical protrusion can be squeezed into the inner hole of the blood chamber interface 4 to form an interference fit, thereby achieving the effect of airtight sealing of the blood chamber interface.

[0038] In some embodiments, the diameter of the hemispherical protrusion 23 is equal to the inner hole of the blood chamber interface 4 , and can abut or seal against the inner hole of the blood chamber interface 4 .

[0039] In some other embodiments, the protrusion 23 may also be in the shape of an inverted frustum or cone, and at least part of the diameter of the protrusion 23 is greater than or equal to the inner diameter of the blood chamber interface. The above shapes are just examples, and the specific shapes are not limited. As long as an interference fit installation form with the blood chamber interface can be achieved and airtightness can be guaranteed, any structural shape can be adopted.

[0040] In addition, it should be noted that the hard rubber material in the above embodiment can be PP or PE, etc., and the soft rubber material can be TPE or PVC, etc.

[0041] In some embodiments, in order to improve the connection effect between the end wall 3 and the peripheral wall 1, a connection hole is further provided on the outer periphery of the top of the peripheral wall 1, and a fixing column 31 is provided at a position corresponding to the hole of the end wall 3, and the fixing column 31 can be embedded in the connection hole. The number of connection holes can be 2 or more, and the more than 2 connection holes can be arranged at equal intervals in pairs. The fixing column 31 can be integrally formed with the end wall 3. When the fixing column 31 is made of elastic material, the diameter of the fixing column 31 can also be slightly larger than the hole diameter of the connection hole, so that an interference fit connection can be achieved, so that the two are connected more tightly and are not easy to fall off.

[0042] A hemodialyzer comprises the above-mentioned universal protective cap for the hemodialyzer.

[0043] In some embodiments, the hemodialyzer includes an upper blood chamber interface and a lower blood chamber interface, and the upper blood chamber interface and the lower blood chamber interface are located in the same vertical direction. The side of the hemodialyzer is provided with two horizontal dialysate interfaces, one for entry and one for exit. The universal protective cap of the hemodialyzer can be respectively covered on the upper and lower blood chamber interfaces and the horizontal dialysate interface.

[0044] In this embodiment, the same protective cap can be used with both the blood chamber interface and the dialysate interface, thereby achieving the universal use of the blood chamber interface and the dialysate interface.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A universal protective cap for a hemodialyzer, characterized in that: It includes an end cover, wherein an annular wall extends from the top of the end cover toward the opening direction of the end cover, a first contact surface is arranged on the outer periphery of the annular wall, a protrusion also extends from the annular wall toward the opening direction of the end cover, and the protrusion is provided with a second contact surface, the annular wall and the protrusion are made of elastic material, the dialysate interface can be sleeved outside the annular wall, the first contact surface is interference fit with the circumference of the inner hole of the dialysate interface, the protrusion can be placed in the blood chamber interface, and the second contact surface is in close contact or interference fit with the inner hole of the blood chamber interface.

2. The universal protective cap for hemodialyzer according to claim 1, characterized in that: The end cover comprises a peripheral wall and an end wall. The peripheral wall is sleeved on the outer periphery of the annular wall. One end of the end wall is connected to the peripheral wall, and the other end is connected to the annular wall.

3. The universal protective cap for hemodialyzer according to claim 1, characterized in that: The ring wall includes an outer ring and a transverse surface closely connected to the circumference of the outer ring, the protrusion is arranged on the lower bottom surface of the transverse surface, the first contact surface is arranged on the outer circumference of the outer ring, and the outer ring, the transverse surface and the protrusion are made of soft rubber material.

4. The universal protective cap for hemodialyzer according to claim 2, characterized in that: The end wall and the annular wall are formed integrally.

5. The universal protective cap for hemodialyzer according to claim 2, characterized in that: The peripheral wall is made of hard rubber material.

6. The universal protective cap for hemodialyzer according to claim 3, characterized in that: The outer diameter of the outer ring gradually decreases toward the end cover opening, and the outer diameter of the outer ring is at least partially larger than the inner diameter of the dialysate interface.

7. The universal protective cap for hemodialyzer according to claim 2, characterized in that: A plurality of ribs are arranged at intervals on the inner circumferential surface of the circumferential wall, and a limit block protruding toward the axial direction of the ring wall is also arranged above the ribs on the inner circumferential surface of the circumferential wall, and the limit block is provided with vertical edges along the axial direction of the circumferential wall and transverse edges perpendicular to the vertical edges, wherein the vertical edges and the outer circumferential wall of the outer ring form a groove, and the groove width matches the thickness of the end wall of the dialysate interface, and the end wall of the dialysate interface can be embedded in the groove when the protective cap is matched with the dialysate interface, and the transverse edge is used to abut against the end face of the blood chamber interface when the protective cap is matched with the blood chamber interface.

8. The universal protective cap for hemodialyzer according to claim 3, characterized in that: The center of the protrusion coincides with the center of the outer ring.

9. The universal protective cap for hemodialyzer according to claim 2, characterized in that: A connection hole is arranged on the outer periphery of the top end of the peripheral wall, and a fixing column facing the peripheral wall is arranged at a position of the end wall corresponding to the hole, and the fixing column can be embedded in the connection hole.

10. A hemodialyzer, characterized in that: A universal protective cap for a hemodialyzer comprising the universal protective cap for a hemodialyzer according to any one of claims 1 to 9.

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