A blood filtration catheter placement device

Abstract

This invention provides a novel blood filtration catheter placement device, comprising a tube body, including an inner tube body and an outer tube body sleeved on the inner tube body. The outer tube body has a circumferentially arranged mounting groove, and multiple sets of channels are spaced circumferentially along its axis. A support rod is slidably mounted within each channel, with one end exposed in the mounting groove and fixedly connected to the outer tube body, and the other end extending outwards. The support rod is made of flexible material, and a mounting plate with a stop is mounted on one end of the support rod. A push ring is rotatably mounted on the outer tube body, sliding along its axis. A pusher is mounted on one end of the push ring, abutting against the stop. This device, by controlling the bending of the support rod, effectively prevents the tube body from adhering to the wall, making the blood filtration process smoother. It also effectively avoids blockage inside blood vessels, prevents obstruction of blood flow, and improves the efficacy of blood filtration treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to a new type of hemofiltration catheter device. BACKGROUND

[0002] Hemofiltration technology is to make blood flow through a filter in an extracorporeal circuit by machine or patient's own blood pressure, and a large amount of liquid and solute is filtered out under the action of filtration pressure, and an electrolyte solution similar to the liquid component of plasma is supplemented to achieve the purpose of blood purification. During hemofiltration, the blood flow of the patient decreases or the blood drawing end opening is easily attached to the inner wall of the blood vessel when turning over, causing the blood drawing to stop, and the position of the pipeline needs to be adjusted constantly.

[0003] For example, the Chinese invention patent application with application number 201610535942.9 provides a blood purification catheter with a balloon. The catheter can inflate the balloon after catheterization to make the balloon expand, and then the front end of the inner tube body floats in the blood vessel, so that the inlet of the blood drawing channel does not occur wall sticking phenomenon, thereby ensuring the patency of the pipeline.

[0004] However, the conventional hemofiltration catheter device prevents wall sticking by the form of balloon support, and the balloon itself occupies a certain volume, which easily causes a certain degree of hindrance to the flow of blood in the blood vessel, thereby reducing the effect of hemofiltration. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a new type of hemofiltration catheter device to solve the technical problem that the conventional hemofiltration catheter device prevents wall sticking by the form of balloon support, which easily causes hindrance to the flow of blood in the blood vessel, thereby reducing the effect of hemofiltration.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme, a new type of hemofiltration catheter device, comprising:

[0007] A tube body comprising an inner tube body and an outer tube body sleeved on the inner tube body, the outer tube body being provided with a plurality of installation grooves arranged circumferentially;

[0008] A plurality of support rods are provided, a plurality of channels are provided on the outer tube body along the axis thereof and spaced circumferentially, the support rods are slidably arranged in the channels, one end of the support rod is exposed in the installation groove and fixedly connected with the outer tube body, and the other end of the support rod extends outward, the support rod being made of flexible material;

[0009] An installation plate is provided, which has the same number of support rods and is connected with the one end of the support rod extending outward, respectively, and the installation plate is provided with a stop block; and

[0010] A pushing ring is sleeved on the outer tube body and can rotate along the axis of the outer tube body and slide along the axis of the outer tube body, and one end of the pushing ring is provided with a pushing frame abutting against the stopper.

[0011] In a preferred embodiment, a blood introduction hole is formed at one end of the outer tube body, a communicating accommodating cavity is arranged at the other end of the outer tube body, one end of the inner tube body is in close fit connection with one end of the outer tube body, the other end of the inner tube body is arranged in the accommodating cavity and is provided with a communicating first pipeline, and a second pipeline is arranged on the accommodating cavity and is in communication with the accommodating cavity.

[0012] In a preferred embodiment, a plurality of groups of guide grooves are distributed on the outer tube body in a commutating manner, and one end of the supporting rod is slidingly clamped in the guide grooves.

[0013] In a preferred embodiment, the width of the pushing frame is greater than the gap between the two adjacent groups of stoppers.

[0014] In a preferred embodiment, a fixedly installed shielding cover and a detachably installed shielding shell are arranged on the outer tube body, and the pushing ring and the plurality of groups of mounting plates are arranged in the shielding cover and the shielding shell.

[0015] In a preferred embodiment, a positioning block connected through a connecting frame is arranged on the pushing ring, a plurality of groups of guide grooves are arranged on the shielding shell in a ring-shaped manner and are spaced apart, the positioning block can be slidingly clamped in the guide grooves or separated from the guide grooves, and a pressing plate is arranged on one side of the positioning block.

[0016] In a preferred embodiment, an elastic block is arranged on the inner side of one end of the pressing plate, a plurality of groups of clamping holes are arranged on the shielding cover in a ring-shaped manner and are spaced apart, and the elastic block is clamped in one group of the clamping holes.

[0017] In a preferred embodiment, a wedge-shaped clamping block is arranged on the inner side of the other end of the pressing plate, a plurality of groups of clamping grooves are arranged on the shielding shell in a ring-shaped manner and are spaced apart, and when the positioning block slides along the guide groove to the limit position, the wedge-shaped clamping block is clamped in one group of the clamping grooves.

[0018] In a preferred embodiment, a first elastic member and a second elastic member are arranged in the shielding shell, one end of the first elastic member abuts against the inner side of the shielding shell, the other end of the first elastic member abuts against the stopper, one end of the second elastic member abuts against the inner side of the shielding shell, and the other end of the second elastic member abuts against the connecting frame.

[0019] In a preferred embodiment, one end of the mounting plate is provided with a positioning groove extending along its axial direction, and the other end is provided with a positioning protrusion extending along its axial direction. Each set of positioning protrusions on the mounting plate is slidably engaged in the positioning groove opened on the adjacent set of positioning protrusions.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In use, after the catheter is inserted into the blood vessel, the pusher ring is rotated to engage the upper pusher against the corresponding stop. The pusher ring then slides along the axis of the outer tube. During this sliding motion, the pusher ring moves, controlling a set of mounting plates to slide along the axis of the outer tube through contact with the stop. This, in turn, causes the support rod to move within the channel. During this movement, the section of the support rod exposed in the mounting groove bends and deforms until it contacts the blood vessel wall, effectively preventing the catheter from adhering to the wall. This makes the blood filtration process smoother and, compared to traditional balloon-type anti-adherence catheters, effectively avoids blockage inside the blood vessel, prevents obstruction of blood flow, and improves the effectiveness of blood filtration treatment.

[0022] 2. During use, when the push plate is moved along the tube axis to move the pusher, the elastic block can engage or disengage from the locking hole. This allows the operator to determine whether the pusher has moved to the corresponding position by touch and sound. Once the pusher is in the correct position, the push plate can be pushed along the guide groove to slide the positioning block along the guide groove, causing the pusher to move horizontally. The width of the pusher is greater than the gap between two adjacent sets of push plates. During the sliding process, the push plate can push two sets of mounting plates to move, causing the two sets of support rods to bend. After the pusher moves to its limit position, the wedge-shaped locking block engages in the locking groove to fix the position of the push plate, eliminating the need for the operator to press the push plate for an extended period. When tube disassembly is required, the wedge-shaped locking block can be disengaged from the locking groove by moving one end of the push plate. Under the action of the first and second elastic elements, the push ring and mounting plate are reset, allowing the support rods to return to their original position, facilitating tube disassembly. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 A three-dimensional structural schematic diagram of a novel blood filtration catheter placement device provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the inner tube and outer tube of a novel blood filtration catheter placement device according to the present invention;

[0026] Figure 3 This is a schematic diagram of the shielding shell in a novel blood filtration catheter placement device of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection structure between the push ring and the stop block in a novel blood filtration catheter placement device of the present invention;

[0028] Figure 5 This is a schematic diagram of the connecting plate in a novel blood filtration catheter placement device of the present invention;

[0029] Figure 6 This is a schematic diagram of the push ring in a novel blood filtration catheter placement device of the present invention;

[0030] Figure 7 This is a cross-sectional view of the internal structure of the shielding shell in a novel blood filtration catheter placement device of the present invention.

[0031] Figure label:

[0032] 1. Tube body; 101. Inner tube body; 102. First conduit; 103. Outer tube body; 104. Drainage port; 105. Receiving cavity; 106. Second conduit; 107. Mounting groove; 108. Channel; 109. Guide groove;

[0033] 201. Masking cover; 202. Clip hole;

[0034] 301. Shielding shell; 302. Card slot; 303. Guide slot;

[0035] 401. Support rod; 402. Mounting plate; 403. Stop block; 404. Positioning groove; 405. Positioning protrusion; 406. First elastic element;

[0036] 501. Propulsion ring; 502. Connecting frame; 503. Positioning block; 504. Press plate; 505. Wedge-shaped locking block; 506. Elastic block; 507. Push frame; 508. Second elastic element. Detailed Implementation

[0037] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 , 2As shown, this invention provides a novel blood filtration catheter placement device, comprising a tube body 1, which includes an inner tube body 101 and an outer tube body 103 sleeved on the inner tube body 101. One end of the outer tube body 103 has a blood drainage hole 104, and the other end of the outer tube body 103 has a communicating receiving cavity 105. One end of the inner tube body 101 is tightly connected to one end of the outer tube body 103, and the other end of the inner tube body 101 passes through the receiving cavity 105 and has a communicating first conduit 102. A second conduit 106 communicating with the receiving cavity 105 is provided on the receiving cavity 105. In use, the tube body 1 is inserted into a blood vessel, and the first conduit 102 and the second conduit 106 are connected to a blood filtration machine. Blood filtration is performed through the passage formed by the gap between the inner tube body 101 and the outer tube body 103.

[0039] like Figure 2 , 4 As shown, in this embodiment, the outer tube 103 has a circumferentially arranged mounting groove 107, and multiple sets of channels 108 are circumferentially spaced along its axis on the outer tube 103. Each set of channels 108 is provided with a support rod 401 that can be slidably installed along its axis. The support rod 401 is made of flexible material, with one end exposed in the mounting groove 107 and fixedly connected to the outer tube 103, and the other end extending out of the channel 108. Multiple sets of guide grooves 109 are distributed in different directions on the outer tube 103, and one end of the support rod 401 is slidably engaged in the guide groove 109.

[0040] The support rod 401 can be pushed along the axis of the channel 108, causing one end of the support rod 401 extending outside the channel 108 to slide within the channel 108. This causes the section of the support rod 401 exposed in the mounting groove 107 to bend until its shape conforms to the blood vessel wall, pushing the tube 1 away from the blood vessel wall, effectively preventing the tube 1 from sticking to the wall. Furthermore, the support rod 401 can be pre-bent to a certain extent during processing to facilitate control of its bending angle. The guide groove 109 positions and guides the movable end of the support rod 401, preventing it from bending.

[0041] like Figure 4 , 5 As shown in Figure 6, in this embodiment, a mounting plate 402 is provided at one end of the support rod 401 that extends out of the channel 108. A stop block 403 is provided on the mounting plate 402. A push ring 501 is rotatably sleeved on the outer tube 103 along its axis. The push ring 501 can slide on the outer tube 103 along its axis. A push frame 507 is provided at one end of the push ring 501. The push frame 507 abuts against the stop block 403.

[0042] By controlling the propulsion ring 501 to rotate along its axis on the outer tube 103, the pusher 507 can move to the side of the corresponding stop 403 and abut against it. Then, the propulsion ring 501 can be controlled to slide along the axis of the outer tube 103, thereby causing the pusher 507 to move and push the stop 403 to move. Since the width of the pusher 507 is greater than the gap between two adjacent sets of stop 403, the pusher 507 can always maintain contact with the two adjacent sets of stop 403. This ensures that during the movement, the pusher 507 drives two sets of support rods 401 to bend until they abut against the blood vessel wall, so that the two sets of support rods 401 and the tube 1 form a stable triangular structure, preventing the tube 1 from shifting inside the blood vessel, thereby effectively improving the anti-wall adhesion effect.

[0043] like Figure 5 As shown, in this embodiment, one end of the mounting plate 402 is provided with a positioning groove 404 extending along its axial direction, and the other end is provided with a positioning protrusion 405 extending along its axial direction. The positioning protrusion 405 on each set of mounting plates 402 is slidably engaged in the positioning groove 404 opened on the adjacent set of positioning protrusions 405. Through the cooperation of the positioning protrusion 405 and the positioning groove 404, the multiple sets of mounting plates 402 are positioned relative to each other, and at the same time, the inner side of the multiple sets of mounting plates 402 is always in contact with the outer tube 103 during the movement, thereby effectively preventing the mounting plates 402 from shifting in the direction other than the axial direction of the outer tube 103 during the movement, and improving the stability of the internal structure of the device.

[0044] like Figure 1 , 3 As shown in Figure 4, in this embodiment, the outer tube 103 is provided with a fixedly installed shield 201 and a detachably installed shield shell 301. The push ring 501 and multiple sets of mounting plates 402 are all disposed inside the shield 201 and the shield shell 301. Through the cooperation of the shield 201 and the shield shell 301, the push frame 507 and the mounting plate 402 can be effectively shielded, thereby preventing the mounting plate 402 from moving due to collisions with external objects.

[0045] The propulsion ring 501 is equipped with a positioning block 503 connected by a connecting frame 502. Multiple sets of guide grooves 303 are circumferentially spaced on the shielding shell 301. The positioning block 503 can be slidably engaged within or disengaged from the guide grooves 303. A pressing plate 504 is provided on one side of the positioning block 503. The propulsion ring 501 can be rotated or slid along the axis of the outer tube 103 by moving the pressing plate 504. When the propulsion ring 501 slides, the movement of the pusher 507 can be positioned by the cooperation of the guide grooves 303 and the positioning block 503, preventing the pusher 507 from deviating from its intended direction.

[0046] like Figure 2 , 6As shown, in this embodiment, an elastic block 506 is provided on the inner side of one end of the button plate 504, and multiple sets of locking holes 202 are circumferentially spaced on the shield 201. The elastic block 506 is locked in one set of locking holes 202. When the button plate 504 is turned to drive the push ring 501 to rotate, the elastic block 506 can be locked into or disengaged from the locking hole 202. Thus, the tactile or auditory feedback from the elastic block 506 can indicate whether the positioning block 503 is aligned with the corresponding guide groove 303, avoiding the positioning block 503 being blocked by the shield 301 during the sliding process of the push ring 501 when the button plate 504 is turned.

[0047] like Figure 3 , 6 As shown in Figure 7, in this embodiment, a wedge-shaped locking block 505 is provided on the inner side of the other end of the pressing plate 504. Multiple sets of locking slots 302 are circumferentially spaced on the shielding shell 301. When the positioning block 503 slides along the guide groove 303 to its limit position, the wedge-shaped locking block 505 is engaged in one of the locking slots 302. When the pressing plate 504 is moved to make the positioning block 503 slide to the limit position of the guide groove 303, the wedge-shaped locking block 505, in cooperation with the locking slot 302, fixes the position of the pressing plate 504, thereby preventing the pusher 507 from shifting and improving the device's anti-wall adhesion effect.

[0048] Furthermore, a first elastic element 406 and a second elastic element 508 are provided inside the shielding shell 301. One end of the first elastic element 406 abuts against the inner side of the shielding shell 301, and the other end abuts against the stop block 403. One end of the second elastic element 508 abuts against the inner side of the shielding shell 301, and the other end abuts against the connecting frame 502. During the process of moving the pressing plate 504, the stop block 403 moves and compresses the first elastic element 406, and the connecting frame 502 moves and compresses the second elastic element 508. When it is necessary to disassemble the device, the wedge-shaped locking block 505 can be disengaged from the slot 302 by moving the pressing plate 504 outward, so that the stop block 403 and the connecting frame 502 can be reset, thereby driving the support rod 401 to reset, so as to avoid the bent support rod 401 affecting the removal of the device when it is removed.

[0049] Specific usage and beneficial effects of the present invention:

[0050] When using this hemofiltration catheter placement device, after inserting the catheter body 1 into the blood vessel, the pusher ring 501 can be rotated to make the pusher 507 above it abut against the corresponding stop 403. Then, by controlling the pusher ring 501 to slide along the axis of the outer catheter body 103, the pusher ring 501 drives the pusher 507 to move. Through abutment against the stop 403, the corresponding set of mounting plates 402 slides along the axis of the outer catheter body 103, thereby causing the support rod 401 to move within the channel 108. During the movement, the section of the support rod 401 exposed in the mounting groove 107 bends and deforms until it abuts against the blood vessel wall, thus effectively preventing the catheter body 1 from sticking to the wall, making the hemofiltration process smoother. Compared with traditional balloon-type anti-wall-sticking catheters, it effectively avoids blockage inside the blood vessel, prevents obstruction of blood flow, and improves the effect of hemofiltration treatment.

[0051] During the movement of the pusher 507 by moving the pusher 504 along the axis of the tube body 1, the elastic block 506 can engage with or disengage from the locking hole 202, allowing the operator to determine by touch and sound whether the pusher 507 has moved to the corresponding position. When the pusher 507 is pushed to the corresponding position, the pusher 504 can be pushed along the guide groove 303 to make the positioning block 503 slide along the guide groove 303 and move the pusher 507 horizontally. The width of the pusher 507 is greater than the gap between two adjacent sets of pushers 504. During the sliding process, the pusher 504 can push two sets of mounting plates 402 to move by abutting against the stop block 403, causing the two sets of support rods 401 to bend. After the pusher 507 moves to the limit position, the wedge-shaped locking block 505 engages in the locking groove 302 to fix the position of the pusher 504, eliminating the need for the operator to press the pusher 504 for a long time. When it is necessary to disassemble the tube body 1, the wedge-shaped locking block 505 can be disengaged from the slot 302 by moving one end of the pressing plate 504. Under the action of the first elastic element 406 and the second elastic element 508, the pushing ring 501 and the mounting plate 402 are controlled to reset, so that the support rod 401 is reset, which facilitates the disassembly of the tube body 1.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A hemofiltration cannula device, characterized in that The utility model relates to a kind of pipe body (1), the pipe body (1) includes inner pipe body (101) and outer pipe body (103) on the inner pipe body (101) is set, and installation slot (107) is opened on the outer pipe body (103) and is arranged in ring; Supporting rod (401) is provided with multiple groups, and multiple groups of channels (108) are spaced apart in ring along the axis of the outer pipe body (103), the supporting rod (401) is slid through in the channel (108), one end of the supporting rod (401) is exposed in the installation slot (107) and is fixedly connected with the outer pipe body (103), the other end is exposed outside, and the supporting rod (401) is flexible material; Mounting plate (402) is provided with same group number with the supporting rod (401) and is respectively connected with the supporting rod (401) exposed outside one end, and the mounting plate (402) is provided with stopper (403); Propelling ring (501) is rotatable along its axis and is set on the outer pipe body (103), and it can slide on the outer pipe body (103) along its axis, one end of the propelling ring (501) is provided with push frame (507), and the push frame (507) is in contact with the stopper (403); The outer pipe body (103) is provided with fixedly mounted shield cover (201) and detachably mounted shield shell (301), and the propelling ring (501) and multiple groups of mounting plates (402) are arranged in the shield cover (201) and the shield shell (301); The propelling ring (501) is provided with positioning block (503) connected by connecting frame (502), and the shield shell (301) is provided with multiple groups of guide slots (303) spaced apart in ring, the positioning block (503) can be slidably clamped in the guide slot (303) or separated from the guide slot (303), and one side of the positioning block (503) is provided with pressing plate (504); One end of the pressing plate (504) is provided with elastic block (506) on the inside, and the shield cover (201) is provided with multiple groups of clamping holes (202) spaced apart in ring, and the elastic block (506) is clamped in one group of the clamping holes (202); The other end of the pressing plate (504) is provided with wedge-shaped clamping block (505) on the inside, and the shield shell (301) is provided with multiple groups of clamping slots (302) spaced apart in ring, and when the positioning block (503) slides to the limit position along the guide slot (303), the wedge-shaped clamping block (505) is clamped in one group of the clamping slots (302); One end of the mounting plate (402) is provided with positioning slot (404) extending along its axis direction, and the other end is provided with positioning convex edge (405) extending along its axis direction, and the positioning convex edge (405) on each group of the mounting plate (402) is slidably clamped in the positioning slot (404) opened in adjacent group of the positioning convex edge (405). ​ 2. The hemofiltration catheter set of claim 1, wherein: One end of the outer tube body (103) is provided with a blood introduction hole (104), the other end of the outer tube body (103) is provided with a communicating containing cavity (105), one end of the inner tube body (101) is connected with the end of the outer tube body (103) in airtight and close-fitting manner, the other end of the inner tube body (101) is arranged in the containing cavity (105) and is provided with a communicating first pipe (102), the containing cavity (105) is provided with a communicating second pipe (106).

3. A hemofiltration catheter device according to claim 2, characterized in that: A plurality of groups of guide grooves (109) are distributed on the outer tube body (103) in a reversing manner, one end of the supporting rod (401) is slidingly clamped in the guide groove (109).

4. The hemofiltration catheter set of claim 1, wherein: The width of the push frame (507) is greater than the gap between the two adjacent groups of the stop blocks (403).

5. The hemofiltration catheter set of claim 1, wherein: The shielding shell (301) is provided with a first elastic member (406) and a second elastic member (508), one end of the first elastic member (406) abuts against the inner side of the shielding shell (301), the other end abuts against the stop block (403), one end of the second elastic member (508) abuts against the inner side of the shielding shell (301), the other end abuts against the connecting frame (502).

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