Semi-permanent vein catheterization thrombectomy device for hemodialysis

Abstract

The utility model discloses a semi-permanent vein catheterization thrombus extraction device for hemodialysis, which relates to the technical field of blood purification and comprises a thrombus extraction device, one end of the thrombus extraction device is provided with a metal net, one end of the metal net is fixedly connected with a threaded connection pipe, and the threaded connection pipe is spirally connected with one end of the thrombus extraction device. An inserting pipe is arranged in the thrombectomy device in a penetrating mode, an inserting guide head is arranged at one end of the inserting pipe, and an expansion structure is arranged between the inserting pipe and the inserting guide head and comprises a plurality of first bent connecting rods, second bent connecting rods and third bent connecting rods; the first bent connecting rod is bent into an oval shape, the first bent connecting rod is attached to the inner wall of the catheter, then the inserting pipe is moved towards the thrombus taking device, the oval first bent connecting rod drives thrombus to move towards the metal net, the thrombus is located in the metal net, and then the thrombus taking device and the inserting pipe are pulled out from the interior of the catheter. The thrombus can be adsorbed and extracted.

Description

Technical Field

[0001] The utility model relates to the technical field of blood purification, in particular to a semi-permanent venous catheterization and thrombus removal device for hemodialysis. Background Art

[0002] With the development of the times, the change of people's dietary structure and the influence of the environment, the incidence of chronic kidney disease is increasing year by year. Hemodialysis is one of the main treatment methods for renal replacement therapy for patients with end-stage renal disease. The deep vein semi-permanent double-lumen dialysis catheter is a very important catheter access selected for hemodialysis. The catheter is left in place for a relatively long time after insertion, and its position is relatively fixed at ordinary times. With the extension of the catheter indwelling time, the risk of thrombosis in the lumen increases. Once the thrombus completely blocks the catheter or the catheter tip is wrapped by the sheath, hemodialysis cannot be carried out smoothly. Nowadays, it is common to use drugs to perform systemic and local thrombolysis on the catheter in order to recanalize the catheter. This method leads to a significant increase in the risk of bleeding in patients. Some patients with abnormal coagulation function or potential bleeding cannot be treated with this method; some patients can only re-establish a blood purification pathway by replacing the dialysis catheter; this causes greater physical and economic burdens on patients. At present, there are many ways to deal with venous thrombosis in clinical practice, such as drug anticoagulation, thrombolysis, interventional thrombolysis, surgical thrombectomy, etc. The above treatments are relatively mature, and these treatments are aimed at the body's own catheters. As a special tube for dialysis catheters of uremia patients, it is different from the body's own catheters. Traditional dialysis catheters cannot absorb and extract blood clots inside the catheter, which causes the blood clots to migrate to the inside of the heart end, and then cause the catheter at the heart end to be blocked, so that blood cannot flow normally in the catheter; therefore, a semi-permanent venous catheterization and thrombectomy device for hemodialysis is provided to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0003] The purpose of the utility model is to provide a semi-permanent venous catheter thrombectomy device for hemodialysis to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A semi-permanent venous catheter thrombectomy device for hemodialysis comprises a thrombectomy device, one end of the thrombectomy device is provided with a metal mesh, one end of the metal mesh is fixedly connected with a threaded connecting tube, the threaded connecting tube is spirally connected to one end of the thrombectomy device, a plug-in tube is penetrated inside the thrombectomy device, one end of the plug-in tube is provided with a plug-in guide head, an expansion structure is provided between the plug-in tube and the plug-in guide head, the expansion structure comprises a plurality of first curved connecting rods, a second curved connecting rod and a third curved connecting rod, one end of the plug-in guide head is fixedly connected with a steel rope, the steel rope penetrates the expansion structure and the plug-in tube and is provided with a pulling rod, one end of the pulling rod is fixedly connected with a handle.

[0006] As a further solution of the utility model: wherein, a plurality of guide plates are fixedly connected to the interior of the thrombus remover, and plug-in holes are provided in the guide plates.

[0007] As a further solution of the utility model: wherein, one end of the plug-in guide head is fixedly connected with an arc head.

[0008] As a further solution of the utility model: wherein, the metal mesh is fixedly connected to one end of the plug-in guide head with a silicone ring, wherein the metal mesh is elastic.

[0009] As a further solution of the utility model: wherein, both ends of the plurality of first curved links are respectively hinged to the plug-in tube and the plug-in guide head, and the second curved link and the third curved link are hinged between the plurality of first curved links.

[0010] As a further solution of the utility model: wherein, the interior of the plug-in tube is slidably connected with a sliding block, and the two ends of the sliding block are fixedly connected to the steel rope and the pulling rod respectively.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The thrombus remover is placed inside the catheter so that the thrombus remover is placed near the thrombus. The diameter of the silicone ring therein is larger than that of the thrombus remover, so that the silicone ring can be clamped inside the catheter, thereby preventing the thrombus remover from being displaced due to blood flow. When removing the thrombus, the plug-in tube is plugged into the inside of the thrombus remover so that the plug-in tube is located between the plug-in hole grooves, and then the plug-in tube is moved so that the arc-shaped head and the expansion structure penetrate the thrombus, and then the position of the plug-in tube is fixed, and the handle is pulled so that the pulling rod drives the plug-in guide head to move toward the plug-in tube through the steel rope, which makes the first curved connecting rod bend into an elliptical shape, so that the first curved connecting rod fits with the inner wall of the catheter, and then the plug-in tube is moved toward the thrombus remover, so that the elliptical first curved connecting rod drives the thrombus to move toward the metal mesh, so that the thrombus is located inside the metal mesh, and then the thrombus remover and the plug-in tube are pulled out from the catheter, and the adsorption and extraction of the thrombus can be completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the expansion structure of the utility model;

[0015] Figure 3 This is a schematic cross-sectional view of the structure of the thrombus remover in the utility model;

[0016] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0017] 1. Thrombus remover; 2. Metal mesh; 201. Silicone ring; 202. Guide plate; 203. Plug-in hole groove; 204. Threaded connecting pipe; 3. Plug-in pipe; 301. Plug-in guide head; 302. Arc head; 303. Steel rope; 304. Handle; 305. Pull rod; 306. Sliding block; 4. Extension structure; 401. First curved connecting rod; 402. Second curved connecting rod; 403. Third curved connecting rod. DETAILED DESCRIPTION

[0018] See also Figures 1 to 3 A semi-permanent venous catheterization and thrombus removal device for hemodialysis comprises a thrombus remover 1, a metal mesh 2 is provided at one end of the thrombus remover 1, a threaded connection tube 204 is fixedly connected to one end of the metal mesh 2, the threaded connection tube 204 is spirally connected to one end of the thrombus remover 1, a plug-in tube 3 is penetrated inside the thrombus remover 1, a plug-in guide head 301 is provided at one end of the plug-in tube 3, an expansion structure 4 is provided between the plug-in tube 3 and the plug-in guide head 301, the expansion structure 4 comprises a plurality of first curved connecting rods 401, a second curved connecting rod 402 and a third curved connecting rod 403, a steel rope 303 is fixedly connected to one end of the plug-in guide head 301, the steel rope 303 penetrates the expansion structure 4 and the plug-in tube 3 and is provided with a pulling rod 305, and a handle 304 is fixedly connected to one end of the pulling rod 305.

[0019] Among them, the overall length of the thrombus remover 1 is enough to reach the tip of the long-term dialysis catheter; further, during the movement of the catheter in the dialysis tube, due to its small cross-sectional area and the arc-shaped guide head provided at the front section, the contact area and resistance between the blood and the guide head are reduced, and the pressure on the blood is reduced, so that the thrombus will not fall off towards the centripetal end due to the movement of the catheter.

[0020] Preferably, a plurality of guide plates 202 are fixedly connected inside the thrombus remover 1 , and a plug-in hole slot 203 is provided in the guide plate 202 .

[0021] The setting of the guide plate 202 can prevent the blood inside the catheter from flowing backwards.

[0022] Preferably, one end of the plug-in guide head 301 is fixedly connected to an arc-shaped head 302 .

[0023] The arc-shaped head 302 can avoid the possibility of scratching the catheter at the edge of the plug-in guide head 301, and facilitates insertion into the blocked thrombus.

[0024] As a further solution of the present invention: wherein, the metal mesh 2 is fixedly connected to one end of the plug-in guide 301 with a silicone ring 201, wherein the metal mesh 2 is elastic.

[0025] The setting of the silicone ring 201 can expand the catheter and facilitate the engagement of the thrombus remover 1 inside the catheter, so that the thrombus remover 1 will not be displaced due to blood flow.

[0026] Preferably, two ends of the plurality of first curved links 401 are respectively hinged to the plug-in tube 3 and the plug-in guide head 301 , and the second curved links 402 and the third curved links 403 are hinged between the plurality of first curved links 401 .

[0027] Among them, the first curved link 401, the second curved link 402 and the third curved link 403 are all elastic, so they can be deformed under the action of external force. The second curved link 402 and the third curved link 403 can avoid the gap between multiple first curved links 401 being too large, resulting in the first curved link 401 being unable to drive the thrombus to move.

[0028] Preferably, a sliding block 306 is slidably connected inside the plug-in tube 3, and two ends of the sliding block 306 are fixedly connected to the steel rope 303 and the pulling rod 305 respectively.

[0029] The sliding block 306 is provided to facilitate the steel rope 303 and the pulling rod 305 to slide inside the plug-in tube 3, so that the steel rope 303 and the pulling rod 305 will not get stuck when sliding inside the plug-in tube 3.

[0030] Working principle: The thrombus remover 1 is placed inside the catheter so that the thrombus remover 1 is placed near the thrombus. The diameter of the silicone ring 201 is larger than that of the thrombus remover 1, so that the silicone ring 201 can be engaged inside the catheter, thereby preventing the thrombus remover 1 from being displaced due to blood flow. When removing the thrombus, the plug-in tube 3 is plugged into the inside of the thrombus remover 1 so that the plug-in tube 3 is located between the plug-in hole grooves 203, and then the plug-in tube 3 is moved so that the arc head 302 and the expansion structure 4 penetrate the thrombus, and then the plug-in tube is fixed. 3, pull the handle 304, so that the pulling rod 305 drives the plug-in guide head 301 to move toward the plug-in tube 3 through the steel rope 303, which will make the first curved link 401 bend into an elliptical shape, so that the first curved link 401 fits with the inner wall of the catheter, and then move the plug-in tube 3 toward the thrombus remover 1, so that the elliptical first curved link 401 drives the thrombus to move toward the metal mesh 2, so that the thrombus is located inside the metal mesh 2, and then pull out the thrombus remover 1 and the plug-in tube 3 from the inside of the catheter, so as to complete the adsorption and extraction of the thrombus.

[0031] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A semi-permanent venous catheter thrombectomy device for hemodialysis, comprising a thrombectomy device (1), characterized in that: One end of the thrombus remover (1) is provided with a metal mesh (2), one end of the metal mesh (2) is fixedly connected with a threaded connection tube (204), the threaded connection tube (204) is spirally connected to one end of the thrombus remover (1), a plug-in tube (3) is provided inside the thrombus remover (1), one end of the plug-in tube (3) is provided with a plug-in guide head (301), an expansion structure (4) is provided between the plug-in tube (3) and the plug-in guide head (301), the expansion structure (4) comprises a plurality of first curved connecting rods (401), a second curved connecting rod (402) and a third curved connecting rod (403), one end of the plug-in guide head (301) is fixedly connected with a steel rope (303), the steel rope (303) passes through the expansion structure (4) and the plug-in tube (3) and is provided with a pulling rod (305), one end of the pulling rod (305) is fixedly connected with a handle (304).

2. A semi-permanent venous catheter thrombectomy device for hemodialysis according to claim 1, characterized in that: A plurality of guide plates (202) are fixedly connected inside the thrombus remover (1), and a plug-in hole groove (203) is provided in the guide plate (202).

3. A semi-permanent venous catheter thrombectomy device for hemodialysis according to claim 1, characterized in that: One end of the plug-in guide head (301) is fixedly connected to an arc-shaped head (302).

4. A semi-permanent venous catheter thrombectomy device for hemodialysis according to claim 1, characterized in that: The metal mesh (2) is fixedly connected to one end of the plug-in guide (301) with a silicone ring (201), wherein the metal mesh (2) is elastic.

5. A semi-permanent venous catheter thrombectomy device for hemodialysis according to claim 1, characterized in that: The two ends of the plurality of first curved connecting rods (401) are respectively hinged to the plug-in tube (3) and the plug-in guide head (301), and the second curved connecting rod (402) and the third curved connecting rod (403) are hinged between the plurality of first curved connecting rods (401).

6. A semi-permanent venous catheter thrombectomy device for hemodialysis according to claim 1, characterized in that: The plug-in tube (3) is slidably connected inside with a sliding block (306), and the two ends of the sliding block (306) are fixedly connected to the steel rope (303) and the pulling rod (305) respectively.

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