Blood perfusion device

Abstract

The utility model provides a hemoperfusion device which comprises a column casing and a sealing assembly for sealing the column casing, and openings are formed in the two ends of the column casing in the first direction. The sealing assembly comprises an end cover, a sealing ring and a filter screen assembly, the end cover is arranged at an opening of the column casing, the end cover is fixedly connected with the column casing, a blood nozzle and a protruding ring protruding towards an inner cavity of the column casing in the first direction are arranged on the end cover, the blood nozzle is communicated with the ring inner side space of the protruding ring, and the filter screen assembly comprises a filter screen and a screen frame extending along the periphery of the filter screen; the filter screen is arranged at the front end of the convex ring in the first direction; the net rack and the sealing ring are both located between the peripheral wall of the end cover and the inner wall of the column casing, the front end, in the first direction, of the net rack abuts against the inner wall of the column casing, the rear end, in the first direction, of the net rack abuts against the end cover and the sealing ring, and the rear end, in the first direction, of the sealing ring abuts against the peripheral wall of the end cover; the sealing assembly further comprises a limiting part, and the limiting part is used for limiting the position of the sealing ring and / or the net rack. The sealing performance of the blood perfusion device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field, specifically, relate to a blood perfusion device. BACKGROUND

[0002] Blood perfusion is one of important ways of blood purification, and blood perfusion is generally carried out by blood perfusion device. In the blood purification process, the blood perfusion device is connected in series in the circulating blood path leading out of the body, and when the blood flows through the tank, the adsorbent adsorbs the toxic substances in the blood, and the purified blood reenters the body circulation. In order to ensure the effect and safety of blood purification, the sealing property of the blood perfusion device is particularly important.

[0003] In the prior art, the blood perfusion device is mainly composed of a cylinder, an end cover mounted on the shell cylinder, a sealing ring and a filter screen, and the end cover and the cylinder are screwed together, so that the inner surface of the end cover presses the sealing ring to ensure the sealing effect. However, in the actual use process, the friction between the end cover surface and the sealing ring during the screwing of the end cover and the cylinder can easily cause the sealing ring to deform and deviate from the original sealing position, thereby increasing the risk of leakage of the blood perfusion device and affecting the qualification rate of the blood perfusion device. SUMMARY

[0004] The utility model aims at providing a blood perfusion device which can avoid displacement of the sealing ring to improve the sealing property.

[0005] To solve the above problems, the utility model provides a blood perfusion device, which comprises a cylinder and a sealing assembly, the cylinder has openings at both ends in a first direction, the inside of the cylinder is hollow, and the sealing assembly is used for sealing the openings of the cylinder.

[0006] The sealing assembly comprises an end cover, a sealing ring and a filter screen assembly, the end cover is arranged at the opening of the cylinder, the end cover is fixedly connected with the cylinder, a blood nozzle and a convex ring protruding towards the inner cavity of the cylinder in the first direction are arranged on the end cover, the blood nozzle is in communication with the space inside the convex ring, the filter screen assembly comprises a filter screen and a mesh frame extending along the outer periphery of the filter screen, and the filter screen is arranged at the front end of the convex ring in the first direction.

[0007] The mesh frame and the sealing ring are located between the outer peripheral wall of the end cover and the inner wall of the cylinder, the front end of the mesh frame in the first direction abuts against the inner wall of the cylinder, the rear end of the mesh frame in the first direction abuts against the end cover and the sealing ring, and the rear end of the sealing ring in the first direction abuts against the outer peripheral wall of the end cover.

[0008] The sealing assembly further comprises a limiting part for limiting the position of the sealing ring and / or the mesh frame.

[0009] Further, at least one of the limiting parts is arranged between the sealing ring and the end cover.

[0010] Further, at least one of the limiting parts is arranged between the net rack and the end cover.

[0011] Further, at least one of the limiting parts is arranged between the net rack and the column.

[0012] Further, at least one of the limiting parts is arranged between the sealing ring and the net rack.

[0013] Further, the limiting part comprises a limiting protrusion and a limiting groove matched with the limiting protrusion, and the limiting protrusion and the limiting groove are arranged on two adjacent components respectively.

[0014] Further, the limiting protrusion comprises a first limiting protrusion and / or a second limiting protrusion, the first limiting protrusion is arranged on a side surface of the sealing ring facing the end cover in the first direction, the second limiting protrusion is arranged on a side surface of the sealing ring facing the outer circumferential wall of the end cover in the second direction, the first limiting protrusion and the second limiting protrusion are integrally connected with the sealing ring, and the second direction is perpendicular to the first direction.

[0015] The end cover is provided with a limiting groove matched with the first limiting protrusion and / or the second limiting protrusion.

[0016] Further, the limiting protrusion comprises a third limiting protrusion, the third limiting protrusion is arranged on a side surface of the net rack facing the end cover in the first direction, the third limiting protrusion is integrally connected with the net rack, and the end cover is provided with a limiting groove matched with the third limiting protrusion.

[0017] Further, the limiting protrusion comprises a fourth limiting protrusion, the fourth limiting protrusion is arranged on a side surface of the column facing the net rack in the first direction, the fourth limiting protrusion is integrally connected with the column, and the net rack is provided with a limiting groove matched with the fourth limiting protrusion.

[0018] Further, in the first direction, the top end of the fourth limiting protrusion is higher than the bottom end of the convex ring.

[0019] Further, the limiting protrusion comprises a fifth limiting protrusion, the fifth limiting protrusion is arranged on a side surface of the net rack facing the sealing ring in the first direction, the fifth limiting protrusion is integrally connected with the net rack, and the sealing ring is provided with a limiting groove matched with the fifth limiting protrusion.

[0020] Further, the sealing ring is formed by curing glue applied on the outer peripheral wall of the end cover.

[0021] Further, the end cover further comprises a cap for covering the blood nozzle, and a sealing gasket is arranged between the blood nozzle and the cap for sealing the inlet of the blood nozzle.

[0022] The blood perfusion device provided by the utility model, by setting the net rack and the sealing ring between the end cover and the cylinder, and abutting one end of the net rack along the first direction with the cylinder and the other end of the net rack with the end cover and the sealing ring, the net rack is limited between the end cover and the cylinder by this setting mode, the displacement of the net rack in the axial and radial directions can be effectively avoided, so that the displacement of the net rack in the blood perfusion device is avoided, the assembly gap between the net rack and the cylinder or the assembly gap between the net rack and the end cover is avoided from being enlarged, and the sealing property of the blood perfusion device is improved. Meanwhile, one end of the sealing ring along the first direction abuts with the net rack, and the other end of the sealing ring abuts with the end cover, the sealing ring can be limited between the end cover, the cylinder and the net rack, the sealing ring is limited by the three limiting parts, the position of the sealing ring is limited, the displacement of the sealing ring is avoided, and the sealing property of the blood perfusion device is improved. In addition, the sealing ring is used for sealing the cooperation between the cylinder and the end cover and the cooperation between the end cover and the net rack, the number of the sealing ring is reduced, the structure of the blood perfusion device is simplified, and the cost of the blood perfusion device is reduced. In addition, the limiting part is arranged in the sealing assembly, the tightness of the connection between the sealing ring and the adjacent part is increased, the position of the sealing ring is further limited, and the risk of displacement of the sealing ring is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The cross-sectional structure schematic view of the blood perfusion device provided by the utility model embodiment is provided;

[0024] Figure 2 The cross-sectional structure schematic view of the end cover in the blood perfusion device provided by the utility model embodiment is provided;

[0025] Figure 3 The enlarged structure schematic view of the middle A part is provided; Figure 1

[0026] Figure 4 The first structure schematic view of the sealing assembly in the blood perfusion device provided by the utility model embodiment is provided;

[0027] Figure 5 The second structure schematic view of the sealing assembly in the blood perfusion device provided by the utility model embodiment is provided;

[0028] Figure 6 ​The third structure schematic diagram of the sealing assembly in the blood perfusion device is provided in the embodiments of the present application.

[0029] Figure 7 The fourth structure schematic diagram of the sealing assembly in the blood perfusion device is provided in the embodiments of the present application.

[0030] Figure 8 The fifth structure schematic diagram of the sealing assembly in the blood perfusion device is provided in the embodiments of the present application. DETAILED DESCRIPTION

[0031] The technical solutions of the present application are described in detail below with reference to the drawings. In the description of the present application, it should be noted that the directions or position relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inner", "outer" are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular direction, be constructed in a particular direction and be operated, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In addition, in the description of the present application, the meaning of "at least one" is one or more, unless otherwise specifically limited.

[0032] In the description of the present application, the description of the term "as an optional embodiment" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one optional embodiment or optional example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0033] In combination with Figure 1 And Figure 3 As shown in the drawings, the present embodiment provides a blood perfusion device, which comprises a cylinder 10 and a sealing assembly 20, the cylinder 10 has openings at both ends along a first direction (i.e. an axial direction), the inside of the cylinder 10 is hollow, the inside of the cylinder 10 is used to load an adsorbent, the sealing assembly 20 is used to seal the openings of the cylinder 10, two groups of sealing assemblies 20 are respectively installed at the two openings of the cylinder 10 along the first direction, and the structures of the two groups of sealing assemblies 20 are the same.

[0034] The sealing assembly 20 comprises an end cover 21, a sealing ring 22 and a filter screen assembly. The end cover 21 covers the opening of the cylinder 10 and is fixedly connected to the cylinder 10. The end cover 21 is provided with a blood nozzle 211 and a convex ring 212 protruding towards the inner cavity of the cylinder 10 in the first direction. The blood nozzle 211 is in communication with the space inside the ring of the convex ring 212. The convex ring 212 extends into the inner cavity of the cylinder 10, and the outer peripheral wall surface of the convex ring 212 coincides with the axis of the inner wall surface of the cylinder 10 and is arranged in a spaced manner.

[0035] The filter screen assembly comprises a filter screen 23 and a screen frame 24. The filter screen 23 is in the shape of a ring. The screen frame 24 extends along the outer peripheral edge of the filter screen 23 and protrudes away from the inner cavity of the cylinder 10 in the first direction relative to the filter screen 23. The filter screen 23 covers the front end of the convex ring 212 in the first direction, and the filter screen 23 and the convex ring 212 are arranged in a spaced manner.

[0036] The screen frame 24 and the sealing ring 22 are both located between the outer peripheral wall of the end cover 21 and the inner wall of the cylinder 10. The front end of the screen frame 24 in the first direction abuts against the inner wall of the cylinder 10. The rear end of the screen frame 24 in the first direction abuts against the end cover 21 and the sealing ring 22. The rear end of the sealing ring 22 in the first direction abuts against the outer peripheral wall of the end cover 21. The sealing assembly 20 further comprises a limiting part for limiting the position of the sealing ring 22 and / or the screen frame 24.

[0037] In the blood perfusion device provided in the embodiment, the screen frame and the sealing ring are arranged between the end cover and the cylinder. One end of the screen frame abuts against the cylinder in the first direction, and the other end of the screen frame abuts against the end cover and the sealing ring. In this way, the screen frame is limited between the end cover and the cylinder, which can effectively avoid the deviation of the screen frame in the axial and radial directions, thereby avoiding the deviation of the position of the screen frame in the blood perfusion device and avoiding the increase of the assembly gap between the screen frame and the cylinder or the increase of the assembly gap between the screen frame and the end cover, which is conducive to improving the sealing performance of the blood perfusion device. Meanwhile, one end of the sealing ring abuts against the screen frame in the first direction, and the other end of the sealing ring abuts against the end cover, which can limit the sealing ring between the end cover, the cylinder and the screen frame. The limiting of the three parts can constrain the sealing ring to limit the position of the sealing ring, thereby avoiding the displacement of the sealing ring and improving the sealing performance of the blood perfusion device. In addition, the sealing ring is used for sealing the cooperation between the cylinder and the end cover and for sealing the cooperation between the end cover and the screen frame, which is conducive to reducing the number of sealing rings, simplifying the structure of the blood perfusion device and reducing the cost of the blood perfusion device. Furthermore, the limiting part is arranged in the sealing assembly to increase the tightness of the connection between the sealing ring and the adjacent parts, which can further limit the position of the sealing ring and further reduce the risk of displacement of the sealing ring.

[0038] Specifically, in combination with the above description, the following can be understood. Figure 2As shown, the outer periphery of the end cover 21 is circular, and the outer peripheral wall surface of the end cover 21 has a first outer peripheral wall surface 214, a second outer peripheral wall surface 215, a third outer peripheral wall surface 216 and a fourth outer peripheral wall surface 217 distributed in the first direction in sequence, the axes of the first outer peripheral wall surface 214, the second outer peripheral wall surface 215, the third outer peripheral wall surface 216 and the fourth outer peripheral wall surface 217 coincide and the diameters increase in sequence, and the first outer peripheral wall surface 214, the second outer peripheral wall surface 215, the third outer peripheral wall surface 216 and the fourth outer peripheral wall surface 217 are connected in sequence. The first outer peripheral wall surface 214 is the outer peripheral wall surface of the convex ring 212, the grid 24 is fixedly sleeved on the first outer peripheral wall surface 214, the sealing ring 22 is arranged on the second outer peripheral wall surface 215, and the inner wall of the cylinder barrel 10 abuts against the third outer peripheral wall surface 216. Therefore, the end cover 21 with the structure can limit the grid 24 between the end cover 21 and the cylinder barrel 10, and limit the sealing ring 22 between the end cover 21, the cylinder barrel 10 and the grid 24, thereby effectively avoiding the deviation of the grid 24 and the sealing ring 22 in the axial and radial directions.

[0039] In the embodiment, at least one limiting part is arranged between the sealing ring 22 and the end cover 21, and / or at least one limiting part is arranged between the grid 24 and the end cover 21, and / or at least one limiting part is arranged between the grid 24 and the cylinder barrel 10, and / or at least one limiting part is arranged between the sealing ring 22 and the grid 24. The limiting part includes a limiting protrusion and a limiting groove matched with the limiting protrusion, and the limiting protrusion and the limiting groove are arranged on two adjacent components respectively. Therefore, by arranging the limiting part between the above-mentioned adjacent components, the tightness of the connection between the sealing ring 22 and the end cover 21 or the grid 24 can be increased, the sealing ring 22 can be prevented from falling off, and the risk of displacement of the sealing ring 22 can be further reduced, or the tightness of the connection between the grid 24 and the end cover 21 or the cylinder barrel 10 can be increased, so that the position of the sealing ring 22 is indirectly further limited by the grid 24, thereby further reducing the risk of displacement of the sealing ring 22.

[0040] Specifically, in combination with Figure 3 , Figure 5 and Figure 6The limiting protrusions include first limiting protrusions 251 and / or second limiting protrusions 252. The first limiting protrusions 251 are arranged on one side surface of the sealing ring 22 facing the end cover 21 in a first direction, and are arranged around the circumference of the end cover 21. The second limiting protrusions 252 are arranged on one side surface of the outer circumferential wall surface 215 of the sealing ring 22 facing the end cover 21 in a second direction (in the radial direction of the cylinder 10), that is, the second limiting protrusions 252 are arranged on one side surface of the sealing ring 22 facing the second outer circumferential wall surface 215 in the second direction. The end cover 21 is provided with limiting grooves matched with the first limiting protrusions 251 and / or the second limiting protrusions 252. The limiting grooves matched with the first limiting protrusions 251 can be arranged on the connecting surface between the second outer circumferential wall surface 215 and the third outer circumferential wall surface 216, and the limiting grooves matched with the second limiting protrusions 252 can be arranged on the second outer circumferential wall surface 215.

[0041] The first limiting protrusions 251 and the second limiting protrusions 252 are integrally formed with the sealing ring 22, thereby facilitating the stability of the connection between the first limiting protrusions 251, the second limiting protrusions 252 and the sealing ring 22. The number of the first limiting protrusions 251 and the second limiting protrusions 252 is at least one. If there are multiple first limiting protrusions 251, the multiple first limiting protrusions 251 are arranged in the second direction at intervals. If there are multiple second limiting protrusions 252, the multiple second limiting protrusions 252 are arranged in the first direction at intervals.

[0042] In the present embodiment, only the first limiting protrusions 251 can be arranged on the sealing ring 22 to enhance the tightness of the connection between the sealing ring 22 and the end cover 21, prevent the sealing ring 22 from falling off, and prevent the sealing ring 22 from moving in the second direction. Only the second limiting protrusions 252 can be arranged on the sealing ring 22 to enhance the tightness of the connection between the sealing ring 22 and the end cover 21, prevent the sealing ring 22 from falling off, and prevent the sealing ring 22 from moving in the first direction. The first limiting protrusions 251 and the second limiting protrusions 252 can be arranged on the sealing ring 22 at the same time to enhance the tightness of the connection between the sealing ring 22 and the end cover 21, prevent the sealing ring 22 from falling off, and prevent the sealing ring 22 from moving in the first direction and the second direction, thereby better limiting the sealing ring 22.

[0043] In combination Figures 3 to 6As shown, the limiting protrusions include third limiting protrusions 253, which are protrudedly arranged on one side surface of the net rack 24 towards the end cover 21 along the first direction, and are circumferentially arranged along the net rack 24. The end cover 21 is provided with limiting grooves matched with the third limiting protrusions 253. The limiting grooves matched with the third limiting protrusions 253 can be arranged on the connecting surface between the first outer circumferential wall surface 214 and the second outer circumferential wall surface 215. Thus, by arranging the third limiting protrusions 253 on the net rack 24 and the limiting grooves matched with the third limiting protrusions 253 on the end cover 21, the net rack 24 can abut against the end cover 21 through the third limiting protrusions 253, the extrusion force of the end cover 21 on the net rack 24 is strengthened, the sealing property between the end cover 21 and the net rack 24 is enhanced, meanwhile, the position of the net rack 24 can be prevented from being deviated, and the position of the sealing ring 22 is further limited.

[0044] The third limiting protrusions 253 are integrally connected with the net rack 24, thus, the stability of the connection between the third limiting protrusions 253 and the net rack 24 is enhanced. The number of the third limiting protrusions 253 is at least one, if the third limiting protrusions 253 are arranged in plurality, the plurality of third limiting protrusions 253 are arranged in interval along the second direction.

[0045] Based on the above embodiment, as an optional implementation manner, the third limiting protrusions 253 account for 10% to 50% of the sum of the area of the net rack 24 and the third limiting protrusions 253, and the height of the third limiting protrusions 253 protruding from the net rack 24 along the first direction is 1 mm to 5 mm. Thus, the extrusion force of the end cover 21 on the net rack 24 is further strengthened.

[0046] In combination Figure 3 and Figure 8 As shown, the limiting protrusions include fourth limiting protrusions 254, which are protrudedly arranged on one side surface of the column 10 towards the net rack 24 along the first direction, and are circumferentially arranged along the column 10. The net rack 24 is provided with limiting grooves matched with the fourth limiting protrusions 254, which are arranged on one side surface of the net rack 24 towards the column 10. Thus, by arranging the fourth limiting protrusions 254 on the column 10 and the limiting grooves matched with the fourth limiting protrusions 254 on the net rack 24, the net rack 24 can be pressed by the fourth limiting protrusions 254, the extrusion force of the column 10 on the net rack 24 is strengthened, the sealing property between the column 10 and the net rack 24 is enhanced, the position of the net rack 24 can be prevented from being deviated, and the position of the sealing ring 22 is further limited by the net rack 24.

[0047] The fourth limiting protrusion 254 is integrally connected with the cylinder 10, thereby facilitating the stability of the connection between the fourth limiting protrusion 254 and the cylinder 10. The number of the fourth limiting protrusion 254 is at least one, and if the fourth limiting protrusion 254 is provided in multiple, the multiple fourth limiting protrusions 254 are arranged at intervals along the second direction.

[0048] On the basis of the above-mentioned embodiments, as an optional implementation manner, along the first direction, the top end of the fourth limiting protrusion 254 is higher than the bottom end of the convex ring 212. Thereby, not only can the liquid in the cylinder 10 be prevented from penetrating out from the gap between the net rack 24 and the cylinder 10, but also the fourth limiting protrusion 254 can increase the difficulty of foreign matter entering the inside of the cylinder 10, effectively prevent foreign matter from entering the inside of the cylinder 10, and improve the safety of the blood perfusion device.

[0049] In the embodiment, the distance between the top end of the fourth limiting protrusion 254 and the bottom end of the convex ring 212 is h, and the specific value range of h is not limited in the embodiment, and a person skilled in the art can set it according to the actual situation, as long as h is greater than 0.

[0050] In combination with Figure 7 As shown in the figure, the limiting protrusion includes a fifth limiting protrusion 255, the fifth limiting protrusion 255 is arranged on the side surface of the net rack 24 facing the sealing ring 22 along the first direction, and the fifth limiting protrusion 255 is arranged around the circumference of the net rack 24. The sealing ring 22 is provided with a limiting groove matched with the fifth limiting protrusion 255, and the limiting groove is arranged on the side surface of the sealing ring 22 facing the net rack 24. Thereby, by arranging the fifth limiting protrusion 255 on the net rack 24 and arranging the limiting groove matched with the fifth limiting protrusion 255 on the sealing ring 22, the extrusion force of the net rack 24 on the sealing ring 22 can be strengthened, the sealing property between the net rack 24 and the sealing ring 22 can be enhanced, and the position of the sealing ring 22 can be further limited by the fifth limiting protrusion 255.

[0051] The fifth limiting protrusion 255 is integrally connected with the net rack 24, thereby facilitating the stability of the connection between the fifth limiting protrusion 255 and the net rack 24. The number of the fifth limiting protrusion 255 is at least one, and if the fifth limiting protrusion 255 is provided in multiple, the multiple fifth limiting protrusions 255 are arranged at intervals along the second direction. It should be noted that the third limiting protrusion 253 and the fifth limiting protrusion 255 are both arranged on the same side surface of the net rack 24, and the difference lies in that the third limiting protrusion 253 abuts against the end cover 21, and the fifth limiting protrusion 255 abuts against the sealing ring 22.

[0052] On the basis of the above-mentioned embodiments, as an optional implementation, the shapes of the first limiting protrusion 251, the second limiting protrusion 252, the third limiting protrusion 253, the fourth limiting protrusion 254, and the fifth limiting protrusion 255 can be rectangular, trapezoidal, arc-shaped, triangular, or a combination of any two of the above. Those skilled in the art can set them according to actual conditions.

[0053] In the present embodiment, any one of the first limiting protrusion 251, the second limiting protrusion 252, the third limiting protrusion 253, the fourth limiting protrusion 254, and the fifth limiting protrusion 255 can be provided in the sealing assembly 20, or any two, any three, or any four of them can be provided, or all of them can be provided in the sealing assembly 20. Those skilled in the art can set them according to actual conditions. Preferably, all of the first limiting protrusion 251, the second limiting protrusion 252, the third limiting protrusion 253, the fourth limiting protrusion 254, and the fifth limiting protrusion 255 are provided in the sealing assembly 20.

[0054] On the basis of the above-mentioned embodiments, as a preferred implementation, the sealing ring 22 is formed by curing the glue liquid applied on the outer peripheral wall of the end cover 21. Thus, by applying the glue liquid on the outer peripheral wall of the end cover 21 to form the sealing ring 22, the gap between the sealing ring 22 and the outer peripheral wall of the end cover 21 can be reduced, which is conducive to further improving the sealing performance of the sealing assembly and avoiding the entry of foreign matters. Specifically, the glue liquid can be injected on the second outer peripheral wall surface 215 of the end cover 21 and the connecting surface between the second outer peripheral wall surface 215 and the third outer peripheral wall surface 216, and the sealing ring 22 and the glue layer can be formed on the outer peripheral wall of the end cover 21 after the glue liquid is cured. Thus, the sealing ring 22 is arranged on the outer peripheral wall of the end cover 21 in the form of being coated with glue, which not only can reduce the gap between the sealing ring 22 and the end cover 21, but also can further limit the position of the sealing ring 22.

[0055] On the basis of the above-mentioned embodiments, as an optional implementation, the end cover 21 further comprises a cap 213 for covering the blood nozzle 211, and a sealing gasket 218 is further arranged between the blood nozzle 211 and the cap 213, which is used to seal the inlet of the blood nozzle 211 to avoid the entry of foreign matters into the blood nozzle 211.

[0056] On the basis of the above-mentioned embodiments, as an optional implementation, the filter screen 23 is further provided with a non-woven fabric layer 26 at the front end in the first direction, so that the adsorbent in the inner cavity of the cylinder 10 is prevented from moving to the blood nozzle 211 through the inner side ring cavity of the convex ring 212 by arranging the non-woven fabric layer 26.

[0057] On the basis of the above-mentioned embodiments, as an optional implementation, the sealing assembly 2 further comprises a locking nut 27, and the end cover 21 is fixedly connected with the cylinder 10 through the locking nut 27. Specifically, the locking nut 27 is threadedly connected with the outer peripheral wall of the cylinder 10, and part of the structure of the end cover 21 is pressed and fixed between the end of the cylinder 10 and the locking nut 27 in the first direction, and the connecting surface between the third outer peripheral wall surface 216 and the fourth outer peripheral wall surface 217 is abutted against the end of the cylinder 10 under the action of the locking nut 27. Of course, the locking nut 27 can also be used in other ways in the prior art to fixedly connect the end cover 21 and the cylinder 10.

[0058] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. A hemocatheter, characterized by, The application relates to a column and sealing assembly. The column has openings at both ends in a first direction, and is hollow inside. The sealing assembly comprises a cap, a sealing ring and a filter screen assembly. The cap is fixedly connected to the column and has a blood nozzle and a convex ring protruding towards the inner cavity of the column in the first direction. The blood nozzle is in space communication with the inner side of the convex ring.

2. The hemocatheter according to claim 1, characterized in that The filter screen assembly comprises a filter screen and a screen frame extending along the outer periphery of the filter screen. The screen frame and the sealing ring are located between the outer peripheral wall of the cap and the inner wall of the column. The front end of the screen frame in the first direction abuts against the inner wall of the column. The rear end of the screen frame in the first direction abuts against the cap and the sealing ring.

3. The hemocatheter according to claim 2, characterized in that The rear end of the sealing ring in the first direction abuts against the outer peripheral wall of the cap.

4. The hemocatheter according to claim 3, characterized in that The sealing assembly further comprises a limiting part for limiting the position of the sealing ring and / or the screen frame. At least one limiting part is arranged between the sealing ring and the cap.

5. The cartridge of claim 3, wherein the first and second chambers are separated by a membrane. At least one limiting part is arranged between the screen frame and the cap.

6. The cartridge of claim 3, wherein the first and second chambers are separated by a membrane. At least one limiting part is arranged between the screen frame and the column.

7. The cartridge of claim 6, wherein the first and second chambers are separated by a membrane. At least one limiting part is arranged between the sealing ring and the screen frame. The limiting part comprises a limiting protrusion and a limiting groove matched with the limiting protrusion. The limiting protrusion and the limiting groove are arranged on two adjacent components respectively. The limiting protrusion comprises a first limiting protrusion and / or a second limiting protrusion. The first limiting protrusion protrudes from the side surface of the sealing ring towards the cap in the first direction. The second limiting protrusion protrudes from the side surface of the sealing ring towards the outer peripheral wall of the cap in a second direction. The first limiting protrusion and the second limiting protrusion are integrally connected with the sealing ring. The second direction is perpendicular to the first direction. The cap is provided with a limiting groove matched with the first limiting protrusion and / or the second limiting protrusion. The limiting protrusion comprises a third limiting protrusion. The third limiting protrusion protrudes from the side surface of the screen frame towards the cap in the first direction. The third limiting protrusion is integrally connected with the screen frame. The cap is provided with a limiting groove matched with the third limiting protrusion. The limiting protrusion comprises a fourth limiting protrusion. The fourth limiting protrusion protrudes from the side surface of the column towards the screen frame in the first direction. The fourth limiting protrusion is integrally connected with the column. The screen frame is provided with a limiting groove matched with the fourth limiting protrusion. In the first direction, the top end of the fourth limiting protrusion is higher than the bottom end of the convex ring.

8. The cartridge of claim 3, wherein, The limiting protrusion comprises a fifth limiting protrusion, which is arranged on one side surface of the net rack towards the sealing ring in the first direction, and is integrally connected with the net rack, and the sealing ring is provided with a limiting groove matched with the fifth limiting protrusion.

9. The cartridge of claim 1, wherein, The sealing ring is formed by curing glue liquid coated on the outer peripheral wall of the end cover.

10. The cartridge of claim 1, wherein, The end cover further comprises a cap for covering the blood nozzle, and a sealing gasket for sealing the inlet of the blood nozzle is further arranged between the blood nozzle and the cap.

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