Dialyzer end cover

Abstract

The utility model discloses a dialyzer end cover, and belongs to the technical field of dialyzers. Comprising a cover body (3), the center of the upper surface of the cover body (3) is provided with an end head (2) used for introducing blood, the center of the end head (2) is provided with a central tube (1) axially penetrating through the end head (2), the inner surface of the cover body (3) is provided with a sealing groove (7), the inside of the sealing groove (7) is an arc-shaped surface (9), and the arc-shaped surface (9) is a contact surface of the blood, and is characterized in that the surface area of the arc-shaped surface (9) is 1.25 cm < 2 >-13.2 cm < 2 >. According to the end cover of the dialyzer, the contact area of the blood chamber in the end cover is reduced, the volume of the blood chamber is reduced, and the volume of the blood retained in the blood chamber is reduced, so that the blood can smoothly enter the fibrous membrane for dialysis. The condition that fiber membrane holes of the fiber membrane are easily blocked after coagulation due to blood retention in the prior art is further avoided, and the probability of causing blood coagulation adverse accidents is reduced.

Description

Technical Field

[0001] The invention discloses a dialyzer end cover, belonging to the technical field of dialyzers. Background Art

[0002] Dialyzers are essential medical consumables for dialysis treatment of kidney patients. Traditional dialyzers consist of a housing containing a fiber membrane. Polyurethane adhesive seals the ends of the membrane with ports on either end of the housing. End caps are installed at each end of the housing, creating a sealed blood chamber between the two. The patient's blood enters the blood chamber through the openings in the end caps and then passes through the fiber membrane within the housing for dialyzation.

[0003] In the prior art, the following problems exist during the process of blood entering the blood chamber and further passing through the fiber membrane to complete dialysis: because the shell port and the fiber membrane are sealed with polyurethane glue, and the fiber membrane needs to be sintered before being placed in the shell and sealed, the polyurethane glue is mostly located in the area between the fiber membrane and the shell, that is, on the inner wall of the shell. Since there is no fiber membrane here, a blind spot is formed on the outer circle of the blood chamber, and blood flowing there cannot quickly enter the fiber membrane. Although anticoagulants are injected into the patient's blood during dialysis to reduce the blood coagulation rate, the blood retained in this blind spot is still prone to coagulation. Once the blood coagulates in the fiber membrane, it is easy to block the fiber membrane pores during the subsequent dialysis, causing adverse coagulation accidents. At this time, the dialyzer coagulation will cause the dialysis treatment to be interrupted, resulting in a decrease in clearance rate. During the normal dialysis process, the patient will lose a small amount of blood. The coagulation will increase the blood loss and aggravate the patient's anemia symptoms. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a dialyzer end cover which reduces the contact area of ​​the blood chamber in the end cover, eliminates the blind spots existing at the edge of the traditional blood chamber, avoids the retention of blood at the edge of the fiber membrane, and allows the blood to smoothly enter the fiber membrane for dialysis.

[0005] The technical solution adopted by the utility model to solve the technical problem is as follows: the dialyzer end cover includes a cover body, a terminal for introducing blood is provided at the center of the upper surface of the cover body, the center of the terminal is an axially penetrating central tube, a sealing groove is provided on the inner surface of the cover body, the interior of the sealing groove is an arc-shaped curved surface, and the curved surface is the contact surface of the blood, characterized in that: the surface area of ​​the curved surface is 1.25cm 2 ~13.2cm 2 .

[0006] Preferably, the surface area of ​​the curved surface is 1.28 cm 2 .

[0007] Preferably, the end cap is a sleeve structure, and an outer tube is provided outside the central tube.

[0008] Preferably, an end thread is provided on the inner wall of the outer tube.

[0009] Preferably, an oblique groove is provided on the side wall of the sealing groove.

[0010] Preferably, the lower portion of the cover body is a cylindrical structure, and a cover body thread is provided on the inner wall of the cylindrical structure.

[0011] Preferably, the sealing groove is located above the thread of the cover body.

[0012] Preferably, a plurality of tightening grooves are evenly arranged around the circumference of the upper surface of the cover body.

[0013] Preferably, the edge of the tightening groove is arc-shaped.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In this dialyzer end cap, by reducing the contact area of ​​the blood chamber within the end cap, the blood chamber volume is reduced, and the volume of blood retained in the blood chamber is reduced, allowing blood to smoothly enter the fiber membrane for dialysis. This further avoids the problem in the prior art where coagulation caused by retained blood easily blocks the fiber membrane pores, reducing the probability of adverse coagulation accidents.

[0016] After a lot of experiments and verification, the surface area of ​​the curved surface was reduced to 8%~13% of the original surface area (the reduced surface area is 1.25cm 2 ~13.2cm 2 ) is the optimal reduction ratio. If the reduction ratio is less than 8%, blood retention is still likely to occur; if the reduction ratio is greater than 13%, the filling area of ​​the polyurethane glue will be reduced, the filling rate will be reduced, and defects such as pinholes and center glue shortage will appear in the product, reducing product safety.

[0017] In the dialyzer end cap, the edge of the tightening groove adopts an arc transition to ensure that the complex parts of the end cap maintain a uniform wall thickness, reduce the generation of internal stress, and reduce the possibility of the end cap breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A top view of the dialyzer end cap.

[0019] Figure 2 for Figure 1 Middle AA section view.

[0020] Among them: 1. center tube 2. end 3. cover body 4. tightening groove 5. end thread 6. inclined groove 7. sealing groove 8. cover body thread 9. contact surface. DETAILED DESCRIPTION

[0021] Figures 1 and 2 This is the best embodiment of the present invention, Figures 1 and 2 The utility model is further described.

[0022] Example 1:

[0023] like Figure 1 As shown, a dialyzer end cover includes a cover body 3, which is circular and has a plurality of tightening grooves 4 evenly arranged around the upper surface of the cover body 3. The tightening grooves 4 enable the cover body 3 to cooperate with the tightening tool on the external assembly line to fix the cover body 3 to the outer shell of the dialyzer.

[0024] In the dialyzer end cap, the edge of the tightening groove 4 adopts an arc transition to ensure that the complex parts of the end cap maintain a uniform wall thickness, reduce the generation of internal stress, and reduce the possibility of the end cap breaking.

[0025] Combine Figure 2 At the center of the upper surface of the cover body 3, there is a protruding end 2. The end 2 is a sleeve structure. The end 2 includes an outer tube and a central tube 1 coaxially arranged in the outer tube. The central tube 1 passes through the end 2 and the cover body 3. An end thread 5 is provided on the inner wall of the outer tube. The cover body 3 is connected to the external blood access pipeline through the end thread 5.

[0026] After the external blood access line is docked with the end 2, the internal thread on the outer wall of the blood access line is threadedly connected to the end thread 5, so that the interior of the blood access line is docked with the central tube 1. The patient's blood to be dialyzed enters the cover body 3 through the end 2, and then further passes through the dialyzer for dialyzation treatment.

[0027] The lower surface of the cover body 3 is a vertically arranged cylindrical structure, and a cover body thread 8 is provided on the inner wall of the cylindrical structure. The cover body 3 is installed to the port of the dialyzer housing through the cover body thread 8.

[0028] A sealing groove 7 is provided on the inner surface of the cover body 3. The sealing groove 7 is located above the cover body thread 8. The interior of the sealing groove 7 is an arc-shaped curved surface 9. The lower end of the curved surface 9 is circular. A sealing ring (not shown in the figure) is placed in the sealing groove 7. After the cover body 3 is threadedly connected to the dialyzer shell through the cover body thread 8, the polyurethane glue at the dialyzer port contacts the sealing ring and squeezes the sealing ring to deform it, thereby achieving sealing. At this time, the airtightness formed between the cover body 3 and the dialyzer is the blood chamber.

[0029] To facilitate the installation and inspection of the sealing ring, an inclined groove 6 is opened on the side wall of the sealing groove 7. The height of the inclined groove 6 decreases gradually to avoid missing the sealing ring and improve the sealing performance of the dialyzer end cover.

[0030] When blood enters the dialyzer through the central tube of the endpiece 2, it first fills the space between the inside of the cover 3 and the dialyzer shell (the end of the fiber membrane), and then enters the fiber membrane for dialysis. Therefore, the curved surface 9 on the upper surface of the cover 3 is the contact surface between the blood and the fiber membrane (the above-mentioned blood chamber). Due to the different sizes of dialyzers on the market, in this embodiment, the surface area of ​​the curved surface 9 is 14.4 cm 2 In this embodiment, the height and diameter of the arc surface 9 at the top of the cover 3 are proportionally reduced, so that the surface area of ​​the arc surface 9 is reduced to 89% of the original area (about 12.8 cm 2 ), and at the same time, the diameter of the sealing groove 7 located on the outer ring of the arc surface 9 port is proportionally reduced.

[0031] Experiments have shown that reducing the surface area of ​​the curved surface 9 can reduce the volume of the blood chambers at both ends of the dialyzer, thereby reducing the volume and time of blood retention in the dialyzer, effectively preventing adverse events such as coagulation. It also prevents energy from directly acting on the adhesive surface during the drying process, reducing adhesion and preventing product peeling.

[0032] Example 2:

[0033] This embodiment uses the same end cap as that of embodiment 1, with the difference that: in this embodiment, the surface area of ​​the arcuate surface 9 is reduced to 87% of the original area (about 12.5 cm 2 ).

[0034] Example 3:

[0035] The difference between this embodiment and embodiment 1 is that in this embodiment, an end cap corresponding to a dialyzer of a different model from that in embodiment 1 is used. In this embodiment, the surface area of ​​the inner arcuate surface 9 of the cover body 3 is 17.6 cm 2 In this embodiment, the height and diameter of the arc surface 9 are proportionally reduced, so that the surface area of ​​the arc surface 9 is reduced to 92% of the original area (about 13.2cm 2 ), and at the same time, the diameter of the sealing groove 7 located on the outer ring of the arc surface 9 port is proportionally reduced.

[0036] Example 4:

[0037] This embodiment uses the same end cap as that of embodiment 3, the difference being that in this embodiment, the surface area of ​​the arcuate surface 9 is reduced to 90% of the original area (about 12.9 cm 2 ).

[0038] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A dialyzer end cap, comprising a cap body (3), wherein a terminal (2) for introducing blood is provided at the center of the upper surface of the cap body (3), a central tube (1) axially passing through the center of the terminal (2), a sealing groove (7) is provided on the inner surface of the cap body (3), the interior of the sealing groove (7) is an arcuate surface (9), and the arcuate surface (9) is a contact surface for blood, characterized in that: The surface area of ​​the arc surface (9) is 1.25 cm 2 ~13.2cm 2 .

2. The dialyzer end cap according to claim 1, wherein: The surface area of ​​the arc surface (9) is 1.28 cm 2 .

3. The dialyzer end cap according to claim 1, wherein: The end head (2) is a sleeve structure, and an outer tube is further provided outside the central tube (1).

4. The dialyzer end cap according to claim 3, wherein: An end thread (5) is provided on the inner wall of the outer tube.

5. The dialyzer end cap according to claim 1, characterized in that: An oblique groove (6) is provided on the side wall of the sealing groove (7).

6. The dialyzer end cap according to claim 1, characterized in that: The lower part of the cover body (3) is a cylindrical structure, and a cover body thread (8) is provided on the inner wall of the cylindrical structure.

7. The dialyzer end cap according to claim 6, characterized in that: The sealing groove (7) is located above the cover body thread (8).

8. The dialyzer end cap according to claim 1, characterized in that: A plurality of tightening grooves (4) are evenly arranged around the circumference of the upper surface of the cover body (3).

9. The dialyzer end cap according to claim 8, characterized in that: The edge of the tightening groove (4) is arc-shaped.

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