Peripheral vascular intervention thrombectomy catheter with far-end embolism protection structure

Abstract

The invention discloses a peripheral vascular intervention thrombectomy catheter with a far-end embolism protection structure, and relates to the technical field of vascular thrombectomy catheters. The peripheral vessel interventional thrombectomy catheter with the far-end embolism protection structure comprises a catheter body, an embolism protection assembly is arranged at one end of the catheter body, a thrombectomy assembly is arranged on the surface of the catheter body, a transmission assembly is arranged in the catheter body, and the embolism protection assembly comprises a protection pipe network fixedly installed on one side of the catheter body. Through the transmission assembly, one end of a lead screw can drive one side of a filter screen plate to move towards the interior of the protective pipe network through rotation of the lead screw in the use process, so that the protective pipe network is expanded, meanwhile, an air bag piece can be inflated, and after a guide pipe is placed in the use process, the air bag piece can be inserted into the protective pipe network. The preparation time of catheter operation is shortened, the catheter is convenient to operate, thrombectomy and protection operations of the catheter are improved, and the use convenience of the catheter is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vascular thrombectomy catheters, and in particular to a peripheral vascular interventional thrombectomy catheter with a distal embolism protection structure. Background Art

[0002] A thrombectomy catheter is a medical device used to treat intravascular thrombosis. Its flexibility and maneuverability enable precise access to blood vessels to remove or retrieve clots. Its small outer diameter and soft material adapt to the shape and curvature of various blood vessels. It also offers excellent visibility, enabling real-time observation of the intravascular environment through technologies such as fiber optics or ultrasound within the catheter, improving surgical accuracy and safety. Thrombectomy catheters are important interventional medical devices for the treatment of intravascular thrombosis and are widely used in neurological and cardiovascular surgeries.

[0003] However, the vascular interventional thrombectomy catheters currently on the market require that the catheter be placed inside the catheter first, and then the embolic protection structure of the catheter be opened before the thrombectomy operation is performed. During this operation, it is impossible to simultaneously open the embolic protection structure and the thrombectomy structure after the catheter is placed in place, which makes the operation process of the catheter more cumbersome, increases the preparation time of the catheter, makes it inconvenient to operate, and affects the subsequent thrombectomy and protection operations. Summary of the Invention

[0004] The object of the present invention is to provide a peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure, comprising a catheter body, one end of which is provided with an embolic protection component, the surface of the catheter body is provided with a thrombectomy component, and the interior of the catheter body is provided with a transmission component.

[0006] The embolic protection assembly includes a protection pipe network fixedly installed on one side of the catheter body, and a filter screen is fixedly installed on one side of the protection pipe network.

[0007] The embolic protection component is set up to protect the interior of the blood vessel during use, preventing impurities and cleaned debris from entering the interior of the blood vessel during the cleaning process, thereby maintaining the comprehensiveness of the cleaning and facilitating subsequent thrombus removal operations.

[0008] The thrombus removal assembly includes an airbag sheet fixedly mounted on the surface of the catheter body, a lumen is opened inside the catheter body, an airbag ring is fixedly mounted inside the lumen, one end of the airbag ring is connected to a connecting tube, one end of the connecting tube passes through the catheter body and extends to the outside of the catheter body to communicate with one side of the airbag sheet.

[0009] The thrombectomy component is designed to form a closed space with the embolic protection component during use. When performing the thrombectomy operation, it can prevent some fragments generated during the thrombectomy from entering one side of the protective pipe network, thereby improving the cleanliness of the thrombectomy and also improving the success rate of the thrombectomy.

[0010] The transmission assembly includes a partition fixedly installed inside the catheter body, a screw rod is inserted on the partition, one end of the screw rod is rotatably connected to one side of the filter plate through a bearing, and a cannula is provided in the tube cavity of the catheter body.

[0011] The transmission assembly is set up, and during use, the screw rod can be rotated. During the rotation of the screw rod, one end of the screw rod can drive one side of the filter screen plate to move toward the inside of the protective pipe network, thereby expanding the protective pipe network and inflating the airbag sheet at the same time. After the catheter is inserted during use, there is no need to perform cumbersome operations, which reduces the preparation time for catheter operation, makes it easy to operate, improves the thrombus removal and protection operations of the catheter, and improves the convenience of using the catheter.

[0012] Preferably, a curved sheet is fixedly mounted on one side of the airbag sheet, the surface of the curved sheet is configured to be smooth, and the curved sheet is made of silicone.

[0013] The arc-shaped piece is provided to make it fit with the inner wall of the blood vessel during use, and it is also convenient to support the inner wall of the blood vessel during use. It can also prevent damage to the blood vessel during use, and it is also convenient for subsequent thrombectomy operations, thereby improving the convenience of using the catheter.

[0014] Preferably, a reinforcement ring is fixedly installed in the middle of the protection pipe network, the reinforcement ring is made of elastic guide wire, and the diameter of the filter plate is 1.5 times the diameter of the protection pipe network.

[0015] Through the reinforcement ring, the middle part of the protective pipe network can be supported during use, thereby avoiding uneven force on the protective pipe network. At the same time, it also facilitates the subsequent formation of a shuttle shape after the protective pipe network is stressed, thereby facilitating subsequent thrombus removal operations.

[0016] Preferably, the surface of the catheter body is covered with an anti-slip cover, the surface of the anti-slip cover is fixedly installed with an anti-slip strip, the surface of the anti-slip strip is provided with anti-slip grooves, the anti-slip strip is made of silicone, and the inner wall of the anti-slip cover is fixedly connected to the surface of the catheter body.

[0017] The anti-slip cover allows the catheter body to be held in hand during use, and the anti-slip strips provide an anti-slip effect during hand-holding, thereby improving the convenience of using the catheter.

[0018] Preferably, a protective ring is fixedly mounted on one side of the catheter body, the inner wall of the protective ring is slidably connected to the surface of the cannula, and the cannula is adapted to the protective ring.

[0019] The protective ring is provided to facilitate the subsequent hand-held operation of the catheter during use, thereby facilitating the subsequent adjustment of the catheter, thereby facilitating the subsequent thrombus removal operation and improving the convenience of using the catheter.

[0020] Preferably, a rotating block is fixedly mounted on one end of the screw rod outside the catheter body, a rotating plate is fixedly mounted on one side of the rotating block, and anti-slip grooves are provided on the surface of the rotating plate. One end of the cannula is configured to be sealed, and a wire hole is provided at one end of the cannula for the screw rod to pass through, and the inner wall of the wire hole is threadedly connected to the surface of the screw rod.

[0021] The provided rotating block and rotating plate facilitate the rotation of the screw rod during use, thereby facilitating the movement of the corresponding threadedly connected components when the screw rod rotates. This also facilitates the handheld operation of medical operators and improves the operational convenience of the catheter.

[0022] Preferably, a pressure ring is fixedly mounted on one end of the cannula, one side of the pressure ring is in contact with one side of the airbag ring, and the surface and inner ring of the pressure ring are respectively slidably connected to the inner wall of the lumen.

[0023] Through the provided pressure ring, one side of the balloon ring can be squeezed during the movement of the cannula during use, thereby facilitating the squeezing of the gas in the balloon ring into the inside of the connecting tube, thereby facilitating the next step and improving the operation convenience of the catheter.

[0024] Preferably, a thread hole for the threaded rod to pass through is opened on the partition, and the threaded rod is threadedly connected to the thread hole.

[0025] The provided threaded hole is connected to the partition plate by thread. When the screw rod rotates, one end of the screw rod can move to drive one side of the filter screen plate to move, thereby facilitating subsequent operations.

[0026] Preferably, the screw rod is provided with a first thread groove and a second thread groove, the first thread groove is threadedly connected to the thread hole on the insert, and the second thread groove is threadedly connected to the thread hole on the partition.

[0027] By setting the first thread groove and the second thread groove in opposite directions, the corresponding components can be driven to move during the rotation of the screw rod, thereby realizing simultaneous protection and thrombus removal operations on the screw rod when it rotates, thereby improving the convenience of using the catheter.

[0028] Preferably, the number of the airbag sheets is seven, and the seven airbag sheets are distributed in a circular row on the surface of the catheter body, and the outer dimensions of the seven airbag sheets when inflated are the same as the diameter of the filter screen plate.

[0029] The provided filter screen facilitates the protection and filtering of thrombus fragments during use, thereby improving the convenience of using the catheter.

[0030] Compared with the prior art, the present invention has the following beneficial effects: (1) This type of peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure can rotate the screw during use through the transmission component. During the rotation of the screw, one end of the screw can drive one side of the filter plate to move toward the inside of the protective pipe network, thereby expanding the protective pipe network and inflating the airbag sheet. After the catheter is inserted during use, there is no need for tedious operations, which reduces the preparation time for the catheter operation, makes it easy to operate, improves the thrombectomy and protection operations of the catheter, and improves the convenience of use of the catheter.

[0031] (2) This type of peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure, through the embolic protection component set up, can protect the interior of the blood vessel during use, preventing impurities and cleaned debris from entering the interior of the blood vessel during the cleaning process, thereby maintaining the comprehensiveness of the cleaning and facilitating subsequent thrombectomy operations.

[0032] (3) This type of peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure, through the thrombectomy component set up, is convenient for forming a closed space between the thrombectomy component and the embolic protection component during use. When performing the thrombectomy operation, some fragments generated during the thrombectomy can be prevented from entering one side of the protective pipe network, thereby improving the cleanliness of the thrombectomy and also improving the success rate of the thrombectomy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the present invention from a first viewing angle; Figure 3 This is a schematic diagram of a three-dimensional cross-sectional structure of the present invention from a second viewing angle; Figure 4 This is a schematic diagram of a three-dimensional cross-sectional structure of the present invention from a third viewing angle; Figure 5 For the present invention Figure 1 A schematic diagram of the structure at center A; Figure 6 For the present invention Figure 2 A magnified schematic diagram of the structure at point B in the middle; Figure 7 For the present invention Figure 3 A magnified schematic diagram of the structure at point C in the middle; Figure 8 For the present invention Figure 4Structure enlarged schematic view at D.

[0034] In the figure: 1, catheter body; 2, embolism protection assembly; 200, protective tube network; 201, filter screen; 202, reinforcing ring; 3, embolus removal assembly; 300, balloon piece; 301, balloon ring; 302, connecting tube; 303, arc-shaped piece; 4, transmission assembly; 400, partition plate; 401, lead screw; 402, cannula; 403, rotating block; 404, rotating plate; 405, compression ring; 406, first threaded groove; 407, second threaded groove; 5, anti-skid sleeve; 6, anti-skid strip; 7, protective ring. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Please refer to Figures 1-8 The present application provides a technical solution: a peripheral vascular intervention embolus removal catheter with a distal embolus protection structure, comprising a catheter body 1, one end of the catheter body 1 is provided with an embolism protection assembly 2, the surface of the catheter body 1 is provided with an embolus removal assembly 3, and the inside of the catheter body 1 is provided with a transmission assembly 4.

[0037] The embolism protection assembly 2 comprises a protective tube network 200 fixedly installed on one side of the catheter body 1, and a filter screen 201 fixedly installed on one side of the protective tube network 200.

[0038] The embolism protection assembly 2 is arranged to protect the inside of the blood vessel during use, so as to avoid impurities and fragments after cleaning from entering the inside of the blood vessel, thereby maintaining the comprehensiveness of cleaning and facilitating subsequent embolus removal operation.

[0039] The embolus removal assembly 3 comprises a balloon piece 300 fixedly installed on the surface of the catheter body 1, a lumen is formed in the inside of the catheter body 1, a balloon ring 301 is fixedly installed in the inside of the lumen, a connecting tube 302 is communicated with one end of the balloon ring 301, and one end of the connecting tube 302 penetrates through the catheter body 1 and extends to the outside of the catheter body 1 and is communicated with one side of the balloon piece 300.

[0040] The embolus removal assembly 3 is arranged to form a sealed space between the embolus removal assembly 3 and the embolism protection assembly 2 during use, so as to avoid part of the fragments generated during embolus removal from entering one side of the protective tube network 200, thereby improving the cleanliness of embolus removal and the success rate of embolus removal.

[0041] The transmission assembly 4 includes a partition 400 fixedly installed inside the catheter body 1, a screw rod 401 is inserted into the partition 400, one end of the screw rod 401 is rotatably connected to one side of the filter plate 201 through a bearing, and a cannula 402 is provided in the lumen of the catheter body 1.

[0042] The transmission component 4 is set up, and during use, the screw rod 401 can be rotated. During the rotation of the screw rod 401, one end of the screw rod 401 can drive one side of the filter plate 201 to move toward the inside of the protective pipe network 200, thereby expanding the protective pipe network 200 and inflating the airbag sheet 300. After the catheter is inserted during use, there is no need to perform cumbersome operations, which reduces the preparation time for the catheter operation, makes it easy to operate, improves the thrombus removal and protection operations of the catheter, and improves the convenience of using the catheter.

[0043] See also Figure 5 An arc-shaped piece 303 is fixedly installed on one side of the airbag piece 300. The surface of the arc-shaped piece 303 is set to be smooth, and the arc-shaped piece 303 is made of silicone. The arc-shaped piece 303 is set to fit with the inner wall of the blood vessel during use, and it is also convenient to support the inner wall of the blood vessel during use. It can also prevent damage to the blood vessel during use, and it is convenient for subsequent thrombectomy operations, thereby improving the convenience of using the catheter.

[0044] See also Figure 5 A reinforcement ring 202 is fixedly installed in the middle of the protective pipe network 200. The reinforcement ring 202 is made of elastic guide wire. The diameter of the filter plate 201 is 1.5 times the diameter of the protective pipe network 200. The reinforcement ring 202 can support the middle part of the protective pipe network 200 during use, thereby avoiding uneven force on the protective pipe network 200. At the same time, it is also convenient for the subsequent protective pipe network 200 to form a shuttle shape after being stressed, thereby facilitating subsequent thrombus removal operations.

[0045] See also Figure 1 The surface of the catheter body 1 is covered with an anti-slip cover 5, and an anti-slip strip 6 is fixedly installed on the surface of the anti-slip cover 5. The surface of the anti-slip strip 6 is provided with anti-slip grooves. The anti-slip strip 6 is made of silicone. The inner wall of the anti-slip cover 5 is fixedly connected to the surface of the catheter body 1. The anti-slip cover 5 is provided, and the catheter body 1 can be held in hand during use. At the same time, the setting of the anti-slip strip 6 achieves the effect of preventing slipping during hand-holding, thereby improving the convenience of using the catheter.

[0046] See also Figure 1A protective ring 7 is fixedly installed on one side of the catheter body 1. The inner wall of the protective ring 7 is slidably connected to the surface of the cannula 402. The cannula 402 is adapted to the protective ring 7. The provided protective ring 7 facilitates the subsequent hand-held operation of the catheter during use, thereby facilitating the subsequent adjustment of the catheter, thereby facilitating the subsequent thrombus removal operation and improving the convenience of using the catheter.

[0047] See also Figure 2 The screw rod 401 is located at one end outside the catheter body 1 and is fixedly mounted with a rotating block 403. A rotating plate 404 is fixedly mounted on one side of the rotating block 403. The surface of the rotating plate 404 is provided with anti-slip grooves. One end of the cannula 402 is set to be sealed. A wire hole for the screw rod 401 to pass through is opened at one end of the cannula 402. The inner wall of the wire hole is threadedly connected to the surface of the screw rod 401. The rotating block 403 and the rotating plate 404 are arranged to facilitate the rotation of the screw rod 401 during use, thereby facilitating the movement of the corresponding threaded connection components when the screw rod 401 rotates. At the same time, it is also convenient for medical operators to hold the operation and improve the convenience of operation of the catheter.

[0048] See also Figure 6 A pressure ring 405 is fixedly installed at one end of the cannula 402, and one side of the pressure ring 405 is in contact with one side of the balloon ring 301. The surface and inner ring of the pressure ring 405 are respectively slidably connected to the inner wall of the lumen. The set pressure ring 405 can squeeze one side of the balloon ring 301 during the movement of the cannula 402 during use, thereby facilitating the squeezing of the gas in the balloon ring 301 into the interior of the connecting tube 302, thereby facilitating the next step and improving the operation convenience of the catheter.

[0049] See also Figure 6 A wire hole for the screw rod 401 to pass through is opened on the partition 400, and the screw rod 401 is threadedly connected to the wire hole. The wire hole is threadedly connected to the partition 400. When the screw rod 401 rotates, one end of the screw rod 401 can move and drive one side of the filter plate 201 to move, thereby facilitating subsequent operations.

[0050] See also Figure 7 A first thread groove 406 and a second thread groove 407 are provided on the screw rod 401. The first thread groove 406 is threadedly connected to the thread hole on the cannula 402, and the second thread groove 407 is threadedly connected to the thread hole on the partition 400. The first thread groove 406 and the second thread groove 407 are arranged in opposite directions. Therefore, when the screw rod 401 is rotated, the corresponding components can be driven to move, thereby realizing the protection and thrombus removal operations on the screw rod 401 at the same time when it rotates, thereby improving the convenience of using the catheter.

[0051] See also Figure 1There are seven airbag sheets 300, which are distributed in a circular array on the surface of the catheter body 1. The outer dimensions of the seven airbag sheets 300 when inflated are the same as the diameter of the filter screen 201. The filter screen 201 is convenient for protecting and filtering thrombus fragments during use, thereby improving the convenience of using the catheter.

[0052] Working principle: When in use, the catheter is placed in the blood vessel where the thrombus needs to be removed. When the catheter body 1 is located at the thrombus removal position, the filter plate 201 passes through the thrombus removal position, and then the screw rod 401 is rotated. The screw rod 401 is threadedly connected with the partition 400 during the rotation process. Therefore, when the screw rod 401 rotates, one end of the screw rod 401 can drive the center part of the filter plate 201 to move toward the inside of the protective pipe network 200. At this time, the filter plate 201 will squeeze one side of the protective pipe network 200, thereby causing the middle part of the protective pipe network 200 to expand. At this time, the protective pipe network 200 is spindle-shaped; During the rotation of the screw rod 401, the thumb is used to squeeze one side of the protective ring 7 to prevent the cannula 402 from rotating with the screw rod 401. At this time, the screw rod 401, under the action of the first thread groove 406, causes the cannula 402 to move into the interior of the lumen. At the same time, the pressure ring 405 at one end of the cannula 402 squeezes one side of the balloon ring 301. The gas in the balloon ring 301 enters the interior of the balloon sheet 300 through the connecting tube 302. The balloon sheet 300 is then inflated, so that the surface of the balloon sheet 300 is in contact with the inner wall of the blood vessel. At this time, the thrombus removal operation can be performed through the pipeline or by pulling the catheter body 1. During this process, the filter plate 201 can protect one side of the thrombus removal site to prevent leakage.

[0053] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0054] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure, comprising a catheter body (1), characterized in that: An embolic protection component (2) is provided at one end of the catheter body (1), a thrombus removal component (3) is provided on the surface of the catheter body (1), and a transmission component (4) is provided inside the catheter body (1); The embolic protection assembly (2) comprises a protective pipe network (200) fixedly mounted on one side of the catheter body (1), and a filter screen plate (201) fixedly mounted on one side of the protective pipe network (200); The thrombus removal assembly (3) includes an airbag sheet (300) fixedly mounted on the surface of the catheter body (1); a lumen is provided inside the catheter body (1); an airbag ring (301) is fixedly mounted inside the lumen; one end of the airbag ring (301) is connected to a connecting tube (302); one end of the connecting tube (302) passes through the catheter body (1) and extends to the outside of the catheter body (1) to be connected to one side of the airbag sheet (300); The transmission assembly (4) comprises a partition (400) fixedly mounted inside the catheter body (1), a screw rod (401) being inserted into the partition (400), one end of the screw rod (401) being rotatably connected to one side of the filter screen plate (201) via a bearing, and a cannula (402) being provided in the lumen of the catheter body (1).

2. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: A curved sheet (303) is fixedly mounted on one side of the airbag sheet (300), the surface of the curved sheet (303) is configured to be smooth, and the curved sheet (303) is made of silicone.

3. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: A reinforcement ring (202) is fixedly installed in the middle of the protection pipe network (200), and the reinforcement ring (202) is made of elastic guide wire. The diameter of the filter screen plate (201) is 1.5 times the diameter of the protection pipe network (200).

4. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: The surface of the catheter body (1) is covered with an anti-slip sleeve (5), and an anti-slip strip (6) is fixedly installed on the surface of the anti-slip sleeve (5). The surface of the anti-slip strip (6) is provided with anti-slip grooves. The anti-slip strip (6) is made of silicone. The inner wall of the anti-slip sleeve (5) is fixedly connected to the surface of the catheter body (1).

5. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: A protective ring (7) is fixedly mounted on one side of the catheter body (1); the inner wall of the protective ring (7) is slidably connected to the surface of the cannula (402); the cannula (402) is adapted to the protective ring (7).

6. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: A rotating block (403) is fixedly mounted on one end of the screw rod (401) located outside the catheter body (1), and a rotating plate (404) is fixedly mounted on one side of the rotating block (403). The surface of the rotating plate (404) is provided with anti-slip grooves. One end of the cannula (402) is configured to be sealed, and one end of the cannula (402) is provided with a threaded hole for the screw rod (401) to pass through. The inner wall of the threaded hole is threadedly connected to the surface of the screw rod (401).

7. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: A pressure ring (405) is fixedly mounted on one end of the cannula (402), one side of the pressure ring (405) is in contact with one side of the balloon ring (301), and the surface and inner ring of the pressure ring (405) are respectively slidably connected to the inner wall of the lumen.

8. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: The partition (400) is provided with a threaded hole for the threaded rod (401) to pass through, and the threaded rod (401) is threadedly connected to the threaded hole.

9. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: The screw rod (401) is provided with a first thread groove (406) and a second thread groove (407), the first thread groove (406) is threadedly connected to the thread hole on the insertion tube (402), and the second thread groove (407) is threadedly connected to the thread hole on the partition (400).

10. The peripheral vascular interventional thrombectomy catheter with a distal embolic protection structure according to claim 1, characterized in that: The number of the airbag sheets (300) is seven, and the seven airbag sheets (300) are distributed in a circular array on the surface of the catheter body (1), and the outer dimensions of the seven airbag sheets (300) when inflated are the same as the diameter of the filter screen plate (201).

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