A double-lumen dialysis catheter

Abstract

The present invention relates to the technical field of hemodialysis equipment, and provides a double-chamber dialysis catheter, which includes a main tube, a pair of branch tubes, and a connector for connecting the main tube and the pair of branch tubes. The lumen of the main tube is separated by a partition plate to form a pair of flow channels. The characteristics are as follows: Sealing plates are respectively connected to the openings of the flow channels through flexible materials, and the partition plate is formed with positioning grooves; A longitudinally pressurized channel and a laterally pressurized channel that communicate with each other are opened in the partition plate. Intermediate mounting holes and end mounting holes are symmetrically opened on the front and back sides of the partition plate. An intermediate elastic membrane and a spring piece are installed in the intermediate mounting hole, and the lower end surface of the spring piece abuts against the sealing plate. A side elastic membrane is installed in the end mounting hole, and the side elastic membrane is connected to the sealing plate through an elastic stretching body; The double-chamber dialysis catheter further includes a pressurizing assembly, and the pressurizing assembly, the longitudinally pressurized channel, and the laterally pressurized channel are pre-filled with liquid. The present invention solves a series of problems caused by the diffusion of blood into the catheter and the reverse diffusion of heparin out of the catheter into the blood in the existing double-chamber dialysis catheter. At the same time, the use and operation are simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of hemodialysis equipment, and particularly relates to a double-lumen dialysis catheter. Background Art

[0002] Existing double-lumen dialysis catheters include a main tube, a pair of branch tubes, and a connector for connecting the main tube and the pair of branch tubes. After each dialysis of a patient, it is necessary to inject heparin solution from the pair of branch tubes to achieve tube sealing, so as to reduce the formation of thrombus in the tube. However, since the end of the main tube implanted into the human body is open, there is still a risk of blood diffusing into the tube to form thrombus, especially at the end of the main tube; at the same time, the reverse diffusion of heparin out of the tube and into the blood will cause side effects such as allergy, thrombocytopenia, and diarrhea.

[0003] Therefore, we propose a double-lumen dialysis catheter. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] The present invention provides a double-lumen dialysis catheter, which solves a series of problems caused by blood diffusing into the tube and the reverse diffusion of heparin out of the tube and into the blood in the existing double-lumen dialysis catheter.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] A double-lumen dialysis catheter includes a main tube, a pair of branch tubes, and a connector for connecting the main tube and the pair of branch tubes. The lumen of the main tube is separated by a partition plate to form a pair of flow channels. It is characterized in that:

[0009] Sealing plates are respectively connected to the openings of the flow channels through flexible materials or flexible hinges, and the partition plate is formed with positioning grooves;

[0010] A longitudinally pressurized channel and a laterally pressurized channel that communicate with each other are opened in the partition plate. Symmetrically arranged intermediate mounting holes are opened on the front and rear sides of the partition plate at the root of the longitudinally pressurized channel. Symmetrically arranged end mounting holes are opened on the front and rear sides of the partition plate at the end of the laterally pressurized channel. An intermediate elastic membrane and a spring piece are installed in the intermediate mounting holes. The lower end surface of the spring piece abuts against the sealing plate. A side elastic membrane is installed in the end mounting holes. The side elastic membrane is connected to the sealing plate through an elastic stretching body;

[0011] The double-lumen dialysis catheter further includes a pressurizing assembly, and the pressurizing assembly, the longitudinally pressurized channel, and the laterally pressurized channel are pre-filled with liquid;

[0012] When the pressurizing component continues to fill the longitudinal pressurizing channel and the transverse pressurizing channel with liquid, the internal pressure on the side elastic membrane and the middle elastic membrane increases and arches outward, and the middle elastic membrane drives the spring to arch outward synchronously, and the sealing plate flips outward to block the opening of the flow channel under the action of the middle elastic membrane, the side elastic membrane and the spring;

[0013] When the pressurizing component draws back the liquid in the longitudinal pressurizing channel and the transverse pressurizing channel, the internal pressure on the side elastic membrane and the middle elastic membrane is reduced and returns inward to a taut state, and the spring sheet simultaneously returns to a straight state. Under the action of the side elastic membrane and the elastic stretching body, the sealing plate flips inward until it is accommodated in the positioning groove and the end face of the sealing plate is flush with the end face of the partition plate.

[0014] Furthermore, the pressurizing assembly includes a pressurizing outer sleeve, a pressurizing end cover, a pressurizing piston and a pressurizing rod. The pressurizing outer sleeve is fixed to the upper end of the connecting piece, the pressurizing end cover is threadedly installed at the upper end opening of the pressurizing outer sleeve, the pressurizing piston is arranged in the pressurizing outer sleeve and is sealed with the inner side wall of the pressurizing outer sleeve, and the pressurizing rod passes through the pressurizing end cover and extends into the pressurizing outer sleeve and is connected to the pressurizing piston.

[0015] Furthermore, the upper end of the pressurizing end cover extends upward from the edge of the central perforation through which the pressurizing rod passes to form a threaded connecting sleeve, and a conical locking sleeve is formed on the upper end of the threaded connecting sleeve, and an elastic locking plate is formed on the conical locking sleeve through a number of evenly distributed slits. The pressurizing component also includes a locking sleeve, and the locking sleeve has a built-in locking cone surface. The locking sleeve is threadedly connected to the threaded connecting sleeve and the locking cone surface is used to retract each locking plate inward, and each locking plate clamps the pressurizing rod together.

[0016] Furthermore, the thickness of the partition plate behind the side wall of the middle mounting hole is greater than the sum of the thicknesses of the middle elastic membrane and the spring sheet, and the end surface of the spring sheet in a straight state does not exceed the middle mounting hole.

[0017] Furthermore, the end surface of the side elastic membrane in a tensioned state does not extend beyond the side mounting hole.

[0018] Furthermore, the longitudinal pressurizing channel and the transverse pressurizing channel are distributed in an inverted T-shape, and the partition plate is symmetrically provided with end mounting holes on both sides of the middle mounting hole.

[0019] Furthermore, the longitudinal pressurized channel penetrates the partition plate from top to bottom, and a blocking block is fixed to the lower end of the partition plate. The blocking block blocks the lower end opening of the longitudinal pressurized channel and its front and rear side walls are used to limit the rotation of the sealing plate.

[0020] Further, vertical pins extending outward are respectively provided at four corners of the elastic piece, and sliding grooves extending along the length direction are respectively formed on the upper end surface of the sealing block and the upper edge end surface of the middle mounting hole, and the pins are inserted into the sliding grooves.

[0021] Further, a pipe clamp is provided on the branch pipe.

[0022] Further, a pair of connecting pieces extending outward are formed on the left and right sides of the connecting piece, and perforations are formed at the ends of the connecting pieces.

[0023] (III) Beneficial Effects

[0024] The present invention provides a double-chamber dialysis catheter, which has the following beneficial effects:

[0025] 1. The sealing plate can block the opening of the main flow channel, avoid the bidirectional diffusion of heparin and blood, and reduce the risk of thrombus formation and heparin side effects;

[0026] 2. During the opening and closing process of the sealing plate, a scraping operation on the side wall of the flow channel opening can be formed, reducing the risk of thrombus formation at the flow channel opening;

[0027] 3. When the sealing plate is turned inward and received in the positioning groove and the end surface of the sealing plate is flush with the end surface of the partition plate, the influence on blood flow can be reduced. At the same time, the sealing plate can also cover and block each elastic membrane and elastic piece, which can further reduce the influence on blood flow;

[0028] 4. Under the combined action of the pressurizing assembly and the liquid pressurization in the longitudinal and transverse pressurizing channels, the middle elastic membrane expands and arches outward, which can push the sealing plate to turn. At the same time, the middle elastic membrane arches with a certain curvature, and its bottom cannot form a reliable extrusion on the sealing plate, which may cause the sealing plate to not turn in place. The setting of the elastic piece can solve this problem. Under the arching action of the middle elastic membrane, the elastic piece arches outward synchronously. During this period, the elastic piece only undergoes bending deformation in the length direction, that is, the transverse direction, and does not bend in the width direction, that is, the vertical direction. Therefore, the elastic piece can well resist and extrude the sealing plate to ensure that the sealing plate turns in place;

[0029] 5. During the expansion and arching of the middle elastic membrane, the side elastic membranes will expand and arch outward synchronously, and the elastic stretching body will also stretch. When it is necessary to turn and reset and open the flow channel, only by pumping back the liquid in the longitudinal and transverse pressurizing channels through the pressurizing assembly, the side elastic membranes are tightened and the elastic stretching body retracts, realizing the inward turning and resetting of the flap, that is, the outward turning and opening operation and the inward turning and resetting operation of the sealing plate are both realized through the pressurizing assembly, and the operation is simple and convenient. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the first perspective of the present invention;

[0031] Figure 2 Structural schematic diagram of the second perspective of the present invention;

[0032] Figure 3 is Figure 2 Structural schematic diagram of the partial enlargement at position A in

[0033] Figure 4 Structural schematic diagram of the third perspective of the present invention when the bottom end sealing plate of the main pipe is in a closed state;

[0034] Figure 5 Structural schematic diagram of the third perspective of the present invention when the bottom end sealing plate of the main pipe is in an open state;

[0035] Figure 6 Structural schematic diagram of the fourth perspective of the present invention when the bottom end sealing plate of the main pipe is in a closed state;

[0036] Figure 7 Structural schematic diagram of the fourth perspective of the present invention when the bottom end sealing plate of the main pipe is in an open state;

[0037] Figure 8 Cross-sectional structural schematic diagram of the root of the partition plate of the present invention;

[0038] Figure 9 Structural schematic diagram of the cooperation between the elastic piece and the plugging block of the present invention;

[0039] Figure 10 Cross-sectional schematic diagram of the cooperation between the elastic piece and the plugging block of the present invention;

[0040] Figure 11 Explosion structural schematic diagram of the pressurizing assembly of the present invention;

[0041] Figure 12 Cross-sectional schematic diagram of the cooperation between the locking sleeve and the pressurizing end cover of the pressurizing assembly of the present invention.

[0042] In the figure:

[0043] 1. Main pipe;

[0044] 1a. Pipe wall;

[0045] 1b. Partition plate;

[0046] 1b-1. Positioning groove;

[0047] 1b-2. Longitudinal pressurizing channel;

[0048] 1b-3. Transverse pressurizing channel;

[0049] 1b-4. Intermediate mounting hole;

[0050] 1b-5. End mounting hole;

[0051] 1c. Flow channel;

[0052] 2. Branch pipe;

[0053] 3. Connector;

[0054] 4. Pipe clamp;

[0055] 5. Sealing plate;

[0056] 6. Plugging block;

[0057] 6a. Slide groove;

[0058] 7. Intermediate elastic membrane;

[0059] 8. Side elastic membrane;

[0060] 9. Elastic stretching body;

[0061] 10. Elastic piece;

[0062] 10a. Plug pin;

[0063] 11. Pressurizing outer sleeve;

[0064] 12. Pressurizing end cap;

[0065] 12a. Threaded connection sleeve;

[0066] 12b. Locking piece;

[0067] 12c. Slit;

[0068] 13. Pressurizing piston;

[0069] 13a. Locking conical surface;

[0070] 14. Pressurizing rod;

[0071] 15. Locking sleeve. Detailed implementation manners

[0072] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0073] Refer to the attached Figures 1-12 , a double-chamber dialysis catheter, comprising a main pipe 1, a branch pipe 2, a connector 3, a sealing plate 5, elastic membranes (including an intermediate elastic membrane 7 and a side elastic membrane 8), an elastic piece 10 and a pressurizing assembly;

[0074] The lumen of the main pipe 1 is separated by a partition plate 1b to form a pair of flow channels 1c. The pipe wall 1a of the main pipe 1 and the partition plate 1b are integrally formed. The openings of the flow channels 1c are respectively connected with a sealing plate 5 through a flexible material (such as silica gel, silicone rubber film, the two sides of the film are respectively attached and adhered to the sealing plate 5 and the partition plate, or corresponding grooves can be provided so that the surface of the film is flush with the corresponding connection parts of the sealing plate 5 and the partition plate after fitting) or a flexible hinge. The sealing plate 5 has the same cross-sectional shape as the flow channel 1c, both being arcuate. The setting of the flexible material or the flexible hinge can, on the one hand, enable the sealing plate 5 to flip relative to the partition plate 1b, and on the other hand, can achieve the sealing at the connection between the sealing plate 5 and the partition plate 1b. The partition plate 1b is formed with a positioning groove 1b-1, and the partition plate 1b can be received in the positioning groove 1b-1 and the end face of the sealing plate 5 is flush with the end face of the partition plate 1b;

[0075] A longitudinally pressurized channel 1b-2 and a laterally pressurized channel 1b-3 that communicate with each other are formed in the partition plate 1b. The partition plate 1b is symmetrically provided with intermediate mounting holes 1b-4 on the front and rear sides at the root of the longitudinally pressurized channel 1b-2, and the partition plate 1b is symmetrically provided with end mounting holes 1b-5 on the front and rear sides at the end of the laterally pressurized channel 1b-3, that is, the longitudinally pressurized channel 1b-2, the laterally pressurized channel 1b-3, the intermediate mounting holes 1b-4 and the end mounting holes 1b-5 communicate with each other. An intermediate elastic membrane 7 and a spring piece 10 (the spring piece 10 is made of metal material and is in the shape of a horizontally extending strip) are installed in the intermediate mounting hole 1b-4. The lower end face of the spring piece 10 can be in contact with the sealing plate 5. Specifically, the lower end face of the spring piece 10 is flush with the upper end face of the sealing plate 5 that is flipped outward by 90° to close the opening of the flow channel 1c. A side elastic membrane 8 is installed in the end mounting hole 1b-5, and the side elastic membrane 8 is connected to the sealing plate 5 through an elastic stretching body 9;

[0076] A pair of branch pipes 2 are provided and are connected to the main pipe 1 through a connector 3. The pair of branch pipes 2 and the single main pipe 1 are distributed in a Y shape. A pipe clamp 4 is provided on the branch pipe 2;

[0077] The upper end of the connector 3 is provided with a pair of branch pipe connectors, and the lower part is provided with a single main pipe connector. The branch pipe connectors and the main pipe connector are respectively inserted and matched with the corresponding branch pipes 2 and the main pipe 1. An intermediate connection channel and a pair of side connection channels respectively arranged on the left and right sides of the intermediate connection channel are provided inside the connector 3. The intermediate connection channel pressurizing assembly and the (main pipe 1) longitudinally pressurized channel 1b-2, and the side connection channel communicates with the branch pipe 2 and the (main pipe 1) flow channel 1c on the same side;

[0078] The pressurizing assembly includes a pressurizing outer sleeve 11, a pressurizing end cover 12, a pressurizing piston 13 and a pressurizing rod 14. The pressurizing outer sleeve 11 is fixed to the upper end of the connector 3 and communicates with the intermediate connecting channel. The pressurizing end cover 12 is threadedly installed at the upper end opening of the pressurizing outer sleeve 11 to prevent the pressurizing piston 13 and the pressurizing rod 14 from coming out. The pressurizing piston 13 is arranged in the pressurizing outer sleeve 11 and is sealed with the inner side wall of the pressurizing outer sleeve 11. The pressurizing rod 14 penetrates the pressurizing end cover 12 and then extends into the pressurizing outer sleeve 11 and is connected to the pressurizing piston 13.

[0079] The pressurized outer sleeve 11, the middle connecting channel, the longitudinal pressurized channel 1b-2 and the transverse pressurized channel 1b-3 are pre-filled with liquid.

[0080] When the pressurizing assembly continues to fill the longitudinal pressurizing channel 1b-2 and the transverse pressurizing channel 1b-3 with liquid, the internal pressure on the side elastic membrane 8 and the middle elastic membrane 7 increases and arches outward, and the middle elastic membrane 7 drives the spring 10 to arch outward synchronously, and the sealing plate 5 is turned outward to block the opening of the flow channel 1c under the action of the middle elastic membrane, the side elastic membrane 8 and the spring 10;

[0081] When the pressurizing component draws back the liquid in the longitudinal pressurizing channel 1b-2 and the transverse pressurizing channel 1b-3, the internal pressure on the side elastic membrane 8 and the middle elastic membrane 7 is reduced and returns inward to a taut state, and the spring sheet 10 simultaneously returns to a straight state. Under the action of the side elastic membrane and the elastic stretching body 9, the sealing plate 5 flips inwardly to be accommodated in the positioning groove 1b-1, and the end face of the sealing plate 5 is flush with the end face of the partition plate.

[0082] In this embodiment, the upper end of the pressurizing end cover 12 extends upward from the edge of the central perforation through which the pressurizing rod 14 passes to form a threaded connection sleeve 12a, and a conical locking sleeve 15 is formed on the upper end of the threaded connection sleeve 12a. An elastic locking piece 12b is formed on the conical locking sleeve 15 through a number of evenly distributed slits 12c. The pressurizing component also includes a locking sleeve 15, and the locking sleeve 15 has a built-in locking cone surface 13a. The locking sleeve 15 is threadedly connected to the threaded connection sleeve 12a and the locking cone surface 13a is used to retract each locking piece 12b inward, and each locking piece 12b clamps and fixes the pressurizing rod 14 together.

[0083] In this embodiment, the thickness of the partition plate 1b behind the side wall at the middle mounting hole 1b-4 is greater than the sum of the thicknesses of the middle elastic membrane 7 and the spring sheet 10, and the end surface of the spring sheet 10 in a straight state does not extend beyond the middle mounting hole 1b-4; the end surface of the side elastic membrane 8 in a taut state does not extend beyond the side mounting hole; through the above arrangement, the sealing plate 5 can be flipped inward and flush with the partition plate 1b, thereby reducing the dialysis resistance.

[0084] In this embodiment, the longitudinal pressure channel 1b-2 and the transverse pressure channel 1b-3 are distributed in an inverted T shape. The partition plate 1b is symmetrically provided with end mounting holes 1b-5 on both sides of the middle mounting hole 1b-4. Side elastic membranes 8 and elastic stretching bodies 9 are arranged on both sides. On the one hand, it can make the force on the sealing plate 5 balanced when it flips. On the other hand, it can increase the reset elastic force received by the sealing plate 5 when it flips, ensuring that the sealing plate 5 flips in place.

[0085] In this embodiment, the longitudinal pressure channel 1b-2 penetrates the partition plate 1b from top to bottom. A blocking block 6 is fixed at the lower end of the partition plate 1b. The blocking block 6 blocks the lower end opening of the longitudinal pressure channel 1b-2 and the side walls on its front and rear sides are used to limit the rotation of the sealing plate 5. Specifically, when the sealing plate 5 flips outward by 90° to block the opening of the flow channel 1c, the side wall of the sealing plate 5 fits with the side walls in the front and rear directions of the blocking block 6, realizing the position limit of the sealing plate 5.

[0086] In this embodiment, vertical pins 10a extending outward are respectively provided at the four corners of the elastic sheet 10. The upper end surface of the blocking block 6 and the upper edge end surface of the middle mounting hole 1b-4 are both provided with sliding grooves 6a extending along the length direction. The pins 10a are inserted into the sliding grooves 6a. The two ends of the elastic sheet 10 are movably arranged, and are limited and prevented from falling off through the cooperation of the pins 10a and the sliding grooves 6a, facilitating the elastic sheet 10 to arch outward under force.

[0087] In this embodiment, the elastic sheet, the elastic membrane, the sealing plate, etc. are all made of medically acceptable implant materials.

[0088] In other embodiments, the structures of the middle mounting hole 1b-4, the end mounting hole 1b-5, the extension section of the longitudinal pressure channel 1b-2, and the transverse pressure channel 1b-3 can be arranged on the insert piece. The insert piece is inserted into the main pipe 1. The extension section of the longitudinal pressure channel 1b-2 is communicated with the longitudinal pressure channel 1b-2. The side wall of the insert piece is hermetically adhered to the pipe wall 1a and the partition plate 1b. On the one hand, it is convenient for the processing of each mounting hole and the assembly and connection of each elastic membrane, elastic sheet 10, flexible material / flexible hinge and sealing plate 5. On the other hand, it can choose to increase the hardness of the insert piece material to ensure the reliability of the flipping and opening and closing of the sealing plate 5.

[0089] In other embodiments, both sides of the flexible material are in an L shape and are adhesively bonded to the end face and side face of the sealing plate / insert piece at the same time, so that the sealing plate can flip around its long side. The flexible hinge can be a single-axis flexible hinge with a straight circular cross-section or an elliptical cross-section.

[0090] In the case where the double-chamber dialysis catheter of this embodiment is not completely closed by the sealing plate (corresponding scale indication marks can be set on the pressure rod for the three states of the sealing plate being open, not completely closed, and completely closed), normal saline can be injected first, and then heparin solution can be injected to reduce the diffusion of heparin out of the tube and into the blood when the sealing plate flips and closes.

[0091] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-lumen dialysis catheter, comprising a main tube, a pair of branch tubes, and a connector for connecting the main tube and the pair of branch tubes, wherein the lumen of the main tube is separated by a partition plate to form a pair of flow channels, characterized in that: The openings of the flow channels are respectively connected with sealing plates through flexible materials or flexible hinges, and the partition plates are formed with positioning grooves; The partition plate is provided with a longitudinal pressure channel and a transverse pressure channel that are interconnected. The partition plate is symmetrically provided with middle mounting holes on both sides of the front and rear of the root of the longitudinal pressure channel. The partition plate is symmetrically provided with end mounting holes on both sides of the front and rear of the end of the transverse pressure channel. A middle elastic membrane and a spring sheet are installed in the middle mounting hole. The lower end surface of the spring sheet contacts the sealing plate. A side elastic membrane is installed in the end mounting hole. The side elastic membrane is connected to the sealing plate through an elastic stretching body. The double-lumen dialysis catheter further comprises a pressurizing component, wherein the pressurizing component, the longitudinal pressurizing channel, and the transverse pressurizing channel are pre-filled with liquid; When the pressurizing component continues to fill the longitudinal pressurizing channel and the transverse pressurizing channel with liquid, the internal pressure on the side elastic membrane and the middle elastic membrane increases and arches outward, and the middle elastic membrane drives the spring to arch outward synchronously, and the sealing plate flips outward to block the opening of the flow channel under the action of the middle elastic membrane, the side elastic membrane and the spring; When the pressurizing component withdraws the liquid in the longitudinal pressurizing channel and the transverse pressurizing channel, the internal pressure on the side elastic membrane and the middle elastic membrane is reduced and restored inward to a taut state, and the spring sheet is restored to a straight state synchronously, and the sealing plate is flipped inwardly under the action of the side elastic membrane and the elastic stretching body until it is accommodated in the positioning groove and the end surface of the sealing plate is flush with the end surface of the partition plate; The longitudinal pressurizing channel penetrates the partition plate from top to bottom, and a blocking block is fixed at the lower end of the partition plate. The blocking block blocks the lower end opening of the longitudinal pressurizing channel, and the front and rear side walls thereof are used to limit the rotation of the sealing plate; The four corners of the spring sheet are respectively provided with pins extending vertically outward, and the upper end surface of the blocking block and the upper end surface of the middle mounting hole are both provided with sliding grooves extending along the length direction, and the pins are inserted into the sliding grooves; The pressurizing assembly includes a pressurizing outer sleeve, a pressurizing end cover, a pressurizing piston and a pressurizing rod. The pressurizing outer sleeve is fixed to the upper end of the connecting piece. The pressurizing end cover is threadedly installed at the upper end opening of the pressurizing outer sleeve. The pressurizing piston is arranged in the pressurizing outer sleeve and is sealed with the inner side wall of the pressurizing outer sleeve. The pressurizing rod penetrates the pressurizing end cover and then extends into the pressurizing outer sleeve and is connected with the pressurizing piston.

2. A double-lumen dialysis catheter as claimed in claim 1, characterized in that: The upper end of the pressurizing end cover extends upward from the edge of the central perforation through which the pressurizing rod passes to form a threaded connection sleeve, a conical locking sleeve is formed on the upper end of the threaded connection sleeve, and an elastic locking piece is formed on the conical locking sleeve through a plurality of evenly distributed slits. The pressurizing component also includes a locking sleeve, and a locking cone surface is built into the locking sleeve. The locking sleeve is threadedly connected to the threaded connection sleeve and the locking cone surface is used to gather the locking pieces inward, and the locking pieces clamp and fix the pressurizing rod together.

3. A double-lumen dialysis catheter as claimed in claim 1, characterized in that: The thickness of the side wall of the partition plate located at the middle mounting hole is greater than the sum of the thicknesses of the middle elastic membrane and the spring sheet, and the end surface of the spring sheet in a straight state does not exceed the middle mounting hole.

4. A double-lumen dialysis catheter as claimed in claim 1, characterized in that: The end surface of the side elastic membrane in a tightened state does not extend beyond the side mounting hole.

5. A double-lumen dialysis catheter as claimed in claim 1, characterized in that: The longitudinal pressurizing channel and the transverse pressurizing channel are distributed in an inverted T-shape, and the partition plate is symmetrically provided with end mounting holes on both sides of the middle mounting hole.

6. A double-lumen dialysis catheter as claimed in claim 1, characterized in that: The branch pipe is equipped with a pipe clamp.

7. A double-lumen dialysis catheter as claimed in claim 1, characterized in that: The left and right sides of the connecting piece extend outward to form a pair of connecting pieces, and the ends of the connecting pieces are provided with through holes.

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