Obstacle suction device

Abstract

The invention discloses an obstruction suction device, and belongs to the technical field of medical instruments. The obstruction suction device comprises a handle part and a catheter part, wherein the catheter part is connected with the handle part; the catheter part sequentially comprises a bending adjusting section, a transition section and a main body section from the far end to the near end, and the hardness of the bending adjusting section of the catheter part is minimum; a hollow cavity extending in the axial direction is formed in the catheter part, a bending adjusting unit is arranged in the hollow cavity in a penetrating mode, the far end of the bending adjusting unit is connected to the bending adjusting section, the near end of the bending adjusting unit is arranged on the handle part, and the bending adjusting unit is used for adjusting the bending form of the bending adjusting section. The bending adjusting unit in the obstruction suction device does not need to penetrate through the inner wall of the catheter, the performance advantages of a common non-bending-adjustable catheter are reserved, the catheter has the small outer diameter, meanwhile, the catheter has the excellent characteristics of a bending-adjustable catheter, the catheter has the better passing ability in a blood vessel, and damage to the blood vessel wall is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an obstruction suction device. Background Art

[0002] When a blood clot forms in a blood vessel, a mainstream treatment method is to insert a thrombus aspiration catheter (specifications are 4Fr-14Fr) into the blood vessel, align the catheter tip with the thrombus position for negative pressure aspiration, and suck the thrombus out of the body to clear the blood vessel. In this process, the lesion site where the thrombus is formed will encounter different physiological and anatomical structures, such as the side of the blood vessel where the thrombus is attached to the wall, the tortuosity of the blood vessel, and the branch blood vessels, making it difficult for the tip of the thrombus aspiration catheter to reach or face the thrombus. Even though the distal end of the traditional thrombus aspiration catheter is shaped to form a certain bend, it cannot point the catheter to the target position in all situations in the face of complex physiological and anatomical structures, causing the thrombus aspiration catheter to lose its aspiration force and fail to completely remove the thrombus.

[0003] To solve the above problems, some catheters with adjustable bends have appeared on the market, but such suction catheters still have many problems. For example, the catheter body needs to accommodate the bending component, which makes the wall thickness of the catheter thicker than that of the non-bending catheter. Under the premise of the same inner cavity size, the outer diameter of the adjustable bend catheter is too large, which will make it unable to pass through complex diseased blood vessels and even cause damage to the blood vessels.

[0004] Therefore, it is an urgent problem to provide a thin-walled, large-lumen, small-diameter catheter that can ensure the suction effect while being suitable for passing through complex diseased blood vessels, reducing damage to blood vessels, and achieving multi-angle bending. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an obstruction suction device to solve the problem that the existing thrombus suction catheter with adjustable bend tube cannot take into account multi-angle adjustment and wall thickness.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The first aspect of the present invention discloses an obstruction suction device, comprising: a catheter portion and a handle portion, wherein the catheter portion is connected to the handle portion; the catheter portion comprises a bending adjustment section, a transition section and a main section in sequence from the distal end to the proximal end, and the hardness of the bending adjustment section is the smallest; a hollow cavity extending along the axial direction is provided inside the catheter portion, a bending adjustment unit is penetrated in the hollow cavity, the distal end of the bending adjustment unit is connected to the bending adjustment section, and the proximal end is provided on the handle portion, and the bending adjustment unit is used to adjust the bending shape of the bending adjustment section.

[0007] Preferably, the hardness of the bending section, transition section and main section increases sequentially.

[0008] Preferably, it also includes a mounting ring, which is arranged at the distal end of the bending adjustment section; the bending adjustment unit is connected to the mounting ring through the inner wall of the bending adjustment section.

[0009] Further preferably, it also includes a developing ring, which is arranged adjacent to the mounting ring.

[0010] Preferably, the bending unit includes a pull wire, which is connected to the mounting ring through the inner wall of the bending section; the pull wire is in a relaxed state when in a non-bending state; and is in a tensioned state and can cut obstructions when in a bending state.

[0011] Further preferably, the pulling wire includes one or more pulling wires, and the multiple pulling wires are distributed along the circumferential direction of the bending adjustment section.

[0012] Preferably, the conduit portion is a hollow thin-walled structure, and the wall thickness of the conduit portion is greater than or equal to 1 Fr and less than or equal to 2 Fr.

[0013] Preferably, the distal end surface of the catheter portion is perpendicular to the axis of the catheter portion, or the distal end surface of the catheter portion is inclined compared to the axis of the catheter portion.

[0014] Preferably, the handle portion comprises a bending rocker, the bending rocker is sleeved on the catheter portion and the bending rocker can partially swing inside the handle portion, and the proximal end of the bending unit is connected to the bending rocker.

[0015] Preferably, the handle portion comprises a bending rocker, which is arranged adjacent to the catheter portion and can partially swing inside the handle portion, and the proximal end of the bending unit is connected to the bending rocker.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an obstruction suction device, in which a bending unit is inserted into the hollow cavity of the catheter part, the distal end is connected to the bending section, and the proximal end is arranged on the handle part, and is used to adjust the bending shape of the bending section. Compared with the existing thrombus suction catheter with adjustable bend tube, the bending unit used to adjust the bending shape of the bending section in the obstruction suction device can achieve bending without passing through the inner wall of the catheter, retaining the performance advantages of ordinary non-adjustable bend catheters, and having a smaller outer diameter. At the same time, the excellent characteristics of the spacing-adjustable bend catheter make the catheter have better passability in the blood vessel and reduce damage to the blood vessel wall. In addition, the handle part can realize rapid and immediate bending of the bending section, and the operator can push, rotate, and adjust the bend at the same time to achieve complete removal of thrombus in a complex blood vessel, greatly improving the flexibility and safety of operation.

[0017] Furthermore, the pull wire assembly used for bending adjustment can play a role in cutting blood clots in the inner cavity of the catheter, and broken blood clots can be more easily sucked out of the body, thereby improving the efficiency of blood clot removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a front view of the obstruction suction device in which the bending rocker is arranged at the front end in accordance with an embodiment of the present invention; Figure 2 is a partial cross-sectional view of a distal end of a pull-wire catheter portion of an obstruction suction device according to an embodiment of the present invention; Figure 3 is a partial cross-sectional view of the handle portion of the obstruction suction device in which the bending rocker is arranged at the front end in accordance with an embodiment of the present invention; Figure 4 is a partial cross-sectional view of the distal end of the multiple-group pull-wire catheter portion of the obstruction suction device according to an embodiment of the present invention; Figure 5 1 is a schematic diagram of a bending state of a catheter portion of an obstruction suction device in which a bending rocker is arranged at the front end according to an embodiment of the present invention; Figure 6 Schematic diagram of the bending state of the catheter portion of the obstruction suction device in which the bending rocker is arranged at the end according to the embodiment of the present invention; Figure 7 Schematic diagram of the working state of the obstruction suction device according to the embodiment of the present invention performing a small-amplitude bending adjustment; Figure 8 Schematic diagram of the working state of the obstruction suction device according to the embodiment of the present invention for adjusting the bend in any direction; Fig. 9 is a schematic diagram of a distal end of a catheter portion of an obstruction suction device according to an embodiment of the present invention as an end plane; Fig.10 is a schematic diagram of a device for aspirating obstructions according to an embodiment of the present invention, in which the distal end of the catheter portion is an inclined plane; Fig.11 It is a partial cross-sectional view of the handle portion of the obstruction suction device in which the bending rocker is arranged at the end in an embodiment of the present invention.

[0019] Description of reference numerals: 100-catheter part, 101-bending section, 102-transition section, 103-main section, 104-handle part, 201-bending rocker, 202-pull wire, 203-connecting part, 204-Luer connector, 301-mounting ring, 302-developing ring, 801-end plane, 901-inclined plane, 1001-obstruction, 1002-blood vessel. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] In this document, unless otherwise specified, the “distal end” refers to the end away from the handle portion 104 , that is, the end that intervenes inside the human body; the “proximal end” refers to the end close to the handle portion 104 .

[0023] An obstruction suction device, such as Figure 1 As shown, it includes: a handle portion 104 and a catheter portion 100 , and the catheter portion 100 is connected to the handle portion 104 .

[0024] The catheter portion 100 is used for intervention inside the human body. The catheter portion 100 is in the shape of an elongated hollow tube as a whole, and has a hollow cavity extending axially therein. The catheter portion 100 includes a bending adjustment section 101, a transition section 102 and a main section 103 connected in sequence from the distal end to the proximal end, and the hardness of the bending adjustment section 101 is the smallest. In practice, the catheter portion 100 needs to extend to the target position along the target tissue (such as blood vessel 1002, etc.). Therefore, the catheter needs to have sufficient strength so that the operator can smoothly guide the distal end of the catheter portion 100 to the target point. It can be understood that when the catheter portion 100 has a uniform stiffness or hardness as a whole, for example, when the overall stiffness or hardness of the catheter portion 100 is small, it can be beneficial to the bending of the distal end of the catheter portion 100, but it is not conducive to the operator controlling the distal end of the catheter portion 100 to reach the target point. For example, when the overall rigidity or hardness of the catheter portion 100 is relatively large, although the distal end of the catheter portion 100 can be smoothly controlled to reach the target point, it is difficult to bend the end of the catheter portion 100, and ultimately the suction effect of the obstruction 1001 is difficult to be satisfactory. To solve this problem, it is necessary to make the catheter portion 100 have both operational flexibility and the ability to smoothly reach the target point, such as Figure 1The catheter portion 100 shown in the illustrated embodiment includes a bending section 101, a transition section 102 and a main section 103 from the distal end to the proximal end, and the hardness or rigidity of the bending section 101 of the catheter portion 100 is the smallest. It can be understood that in this embodiment, the rigidity or hardness of the bending section 101 is only partially controlled, so that it can facilitate the operator to control its bending shape, thereby taking into account the bending shape control and the overall rigidity of the catheter portion 100, which is conducive to its smooth reaching of the target point. The catheter portion 100 is a hollow thin-walled structure, and the wall thickness of the catheter portion 100 is greater than or equal to 1 Fr and less than or equal to 2 Fr. As mentioned above, the wall thickness (i.e., outer diameter-inner diameter) of the adjustable bending catheter in the prior art is ≥3 Fr (1 mm=3 Fr). The wall thickness of the present catheter is between 1 and 2 Fr, and it can be seen that the wall thickness is greatly reduced, so that the hollow inner cavity size of the catheter is still large enough under the premise of maintaining a smaller outer diameter size, and has the characteristics of thin wall and large cavity. A bending adjustment unit is provided in the hollow cavity of the catheter portion 100, the distal end of the bending adjustment unit is connected to the bending adjustment section 101, and the proximal end is provided on the handle portion 104, and the bending adjustment unit is used to adjust the bending shape of the bending adjustment section 101. As mentioned above, the wall thickness of the catheter of the suction device in the prior art is relatively large, which results in an excessively large outer diameter of the catheter, so that the catheter can only be used in some scenarios and is difficult to adapt to the narrow blood vessels 1002, resulting in a limited scope of application. The main reason for this phenomenon is that in the prior art, the bending adjustment unit of the catheter is set inside the catheter wall, resulting in the inability to install the bending adjustment mechanism on the thinner tube wall. For this reason, in the present structure, the bending adjustment unit is arranged as a whole in the hollow cavity, and the bending adjustment unit is only connected to the catheter wall at a local connection point, thereby reducing the wall thickness and outer diameter of the catheter portion 100 as a whole. The other end (i.e., the proximal end) of the bending adjustment unit is arranged on the handle portion 104, so that the operator can change the working state of the bending adjustment unit by operating the corresponding mechanism of the handle portion 104 at the proximal end, thereby changing the bending shape and / or torsion angle of the bending adjustment section 101.

[0025] In some optional embodiments, the hardness of the bending section 101, the transition section 102 and the main section 103 increases in sequence. The bending section 101, the transition section 102 and the main section 103 can be made of different materials separately, and then the three sections can be connected by injection molding. Of course, the three sections can also be spliced ​​together by ultrasound or hot melting. The three-section setting allows the parameters such as stiffness, hardness and length of each section to be flexibly adjusted as needed, thereby increasing the operational flexibility and scope of application of the device. In particular, the presence of the transition section 102 makes the connection between the bending section 101 and the main section 103 smoother, avoiding the bending shape of the distal end of the catheter part 100 being too rigid, the contour curve part being smooth, and it being difficult to adapt to the complex blood vessel 1002, causing the blood vessel 1002 to rupture and many other problems. Preferably, the hardness of the bending section 101 is 20D-50D, the hardness of the transition section 102 is 35D-72D, and the hardness of the main section 103 is 55D-80D, and the hardness is the Shore hardness.

[0026] Some optional embodiments further include a mounting ring 301, which is disposed at the distal end of the bending adjustment section 101; the bending adjustment unit is connected to the mounting ring 301 through the inner wall of the bending adjustment section 101. Figure 2 In the embodiment shown, a mounting ring 301 is provided at the distal end of the bending adjustment section 101, and the mounting ring 301 is used to connect the bending adjustment unit, so as to achieve the purpose of adjusting the bending shape of the bending adjustment section 101 through the bending adjustment unit. Figure 2 As shown, the mounting ring 301 is disposed at the distal end of the bending adjustment section 101 and as close to the distal end face of the bending adjustment section 101 as possible. It is understandable that the core adjustment parameter of the suction device is the positional relationship between the distal end face of the catheter portion 100 and the obstruction 1001. When the mounting ring 301 is disposed near the distal end face of the bending adjustment section 101, it is convenient to control the position of the distal end face through the bending adjustment unit, that is, the position adjustment of the distal end face is more precise. Preferably, the mounting ring 301 is buried inside the tube wall of the bending adjustment section 101, and the distal end of the bending adjustment unit is fixedly connected to the mounting ring 301. This arrangement can increase the connection strength of the mounting ring 301, thereby allowing the bending adjustment unit to be stably fixed at the distal end of the bending adjustment unit. As shown in FIG. Figure 2 As described above, when the mounting ring 301 with sufficient strength is selected, the size of the mounting ring 301 can be smaller, so as not to increase the wall thickness of the conduit portion 100, and ensure that the overall size of the conduit portion 100 is smaller. In other embodiments, the bending adjustment unit can also be directly penetrated through the inner wall of the bending adjustment section 101 and buried in the conduit portion 100, or the bending adjustment unit can be directly connected to the inner wall of the bending adjustment unit.

[0027] Some optional embodiments further include a developing ring 302, and the developing ring 302 is disposed adjacent to the mounting ring 301. In practice, how to accurately guide the bending section 101 to reach the target point and accurately control the bending position of its end face is an important issue to be considered. Figure 2 In the illustrated embodiment, this problem is solved by providing a developing ring 302. The developing ring 302 is usually made of a material that is not transparent to X-rays (such as a platinum-iridium alloy) and is used to achieve in vivo development under X-rays, thereby helping doctors to accurately determine its position. In order to accurately control the position and angle of the distal end face of the bending adjustment section 101, in some embodiments of the present invention, the developing ring 302 and the mounting ring 301 are arranged adjacent to each other, thereby greatly improving the accuracy and safety of the operator's control of the device.

[0028] In some optional embodiments, the bending unit includes a pull wire 202, and the pull wire 202 is connected to the mounting ring 301 through the inner wall of the bending section 101; the pull wire 202 is in a relaxed state when in a non-bending state; and in a tensioned state when in a bending state and can cut the obstruction 1001. Figure 2 and 3 As shown, one end of the pull wire 202 is connected to the bending section 101, and the other end is connected to the handle portion 104, preferably connected to the bending rocker 201. Furthermore, the operator adjusts the length of the pull wire 202 through the bending rocker 201 to change the bending shape and / or torsion angle of the bending section 101. The pull wire 202 is integrally arranged in the hollow inner cavity of the catheter portion 100. The pull wire 202 can be made of metal materials such as stainless steel, nickel-titanium alloy and tungsten, and its shape can be round wire, flat wire and multi-strand rope. Each bending direction is a group of 1 or 2 wires. The connection method of the pull wire 202 and the mounting ring 301 is not limited to welding, winding and the like. When the catheter portion 100 is not bent, the pull wire 202 is in a relaxed state in the catheter lumen; when the pull wire 202 is bent, the pull wire 202 is tightened toward the bending direction of the group of pull wires 202 and moves outward until it is attached to the inner wall of the blood vessel 1002 in the bending direction. The bending and suctioning actions are performed simultaneously. When an obstruction 1001 (such as a thrombus) is sucked into the inner cavity of the catheter, the bending action enables the pull wire 202 to cut the thrombus moving outward, thereby cutting a large thrombus into a small thrombus, which is easier to be sucked out of the body.

[0029] Further, in some optional embodiments, such as Figure 2 and Figure 4As shown, the pull wire 202 includes one or more pull wires; and the multiple pull wires 202 are distributed along the circumferential direction of the bending section 101. According to the different directions in which the bending section 101 needs to be bent, the pull wire 202 can be set to one or more. That is, multiple groups of pull wires 202 can be set in a catheter, specifically not limited to 1 to 8 groups, or even more groups. The circumferentially symmetrical arrangement of multiple groups of pull wires 202 is more conducive to operator control. Exemplarily, when the pull wire 202 is 1 group, the catheter can achieve unidirectional bending, such as Figure 5 and Figure 6 The bending state shown; when there are two sets of pull wires 202, the catheter can achieve bidirectional forward and reverse bending. As the number of pull wires 202 increases, the number of directions in which the catheter can be bent increases, and the bending direction of the catheter can be rotated in space as the bending rocker 201 rotates. In actual operation, when there are two sets of pull wires 202, the proximal ends of the pull wires 202 pass through the outer wall from the proximal end of the catheter and are fixed on the symmetrical sides of the bending rocker 201. The bending rocker 201 can swing back and forth relative to the handle 104 and can be bent forward and backward. Figure 7 In the embodiment shown, an obstruction 1001, such as a thrombus, is formed on the inner wall of a small tortuous blood vessel 1002. By controlling the bending rocker 201 to slightly bend, the end face of the catheter can be directly facing the thrombus for suction. Figure 8 The embodiment shown can adopt a scheme of four groups of pull wires 202, and the bending section 101 of this scheme can be bent in any direction of 360°. Specifically, the proximal ends of the four groups of pull wires 202 pass through the inner cavity of the catheter and are fixed on the spherical connection part 203 of the bending rocker 201. The pull wires 202 are evenly connected in four directions in three dimensions. The bending rocker 201 can swing and rotate 360° relative to the handle. The embolus can be removed and the bend can be adjusted in the blood vessel 1002 without rotating the catheter for operation, which greatly improves the flexibility and safety of the operation and reduces the difficulty of use for the operator. Figure 5 and Figure 6 In the illustrated embodiment, the size of the bend of the bending section 101 and the rotation of the bend of the bending section 101 are consistent with the movement of the bending rocker 201. The greater the swing amplitude of the bending rocker 201, the greater the bending angle.

[0030] In some optional embodiments, a bending section 101 with different end surface shapes is provided, and the distal end surface direction of the catheter can be a section 801 perpendicular to the catheter axis, or a section 901 at an oblique angle to the catheter axis. That is, the distal end surface of the catheter portion 100 is perpendicular to the axis of the catheter portion 100, forming an end plane 801 ( Fig. 9 ); or, the distal end surface of the catheter portion 100 is inclined relative to the axis of the catheter portion 100 to form an inclined plane 901 ( Fig.10). When the end face is at an oblique angle to the axial direction of the catheter, the opening at the distal end of the catheter has a larger opening area, making it easier to aspirate or capture large thrombi. At the same time, when the space in the blood vessel 1002 is insufficient, a small bending angle can also make the distal end opening of the catheter face the thrombus for convenient aspiration.

[0031] The handle portion 104 is used for the operator to control the working state of the catheter portion 100 in the human body. The handle portion 104 includes a bending adjustment rocker 201 and a handle body. The bending adjustment rocker 201 is clearance-fitted with the handle portion 104 and the catheter portion 100 in the assembled state. In this installation condition, the bending adjustment rocker 201 can swing and / or rotate relative to the catheter portion 100 and / or the handle body. Since the proximal end of the bending unit is fixedly connected to the connecting portion 203 of the bending adjustment rocker 201, when the bending adjustment rocker 201 swings and / or rotates, the stretching or contraction state of the bending unit will be changed, thereby driving the bending section 101 to bend and / or twist, so that the end face of the bending section 101 is accurately close to the target point.

[0032] In some optional embodiments, the bending adjustment rocker 201 is sleeved on the catheter portion 100 , and the bending adjustment rocker 201 can partially swing inside the handle portion 104 ; the proximal end of the bending adjustment unit is connected to the bending adjustment rocker 201 .

[0033] In some other optional embodiments, the handle portion 104 includes a bending adjustment rocker 201, which is arranged adjacent to the catheter portion 100 and can partially swing inside the handle portion 104; the proximal end of the bending adjustment unit is connected to the bending adjustment rocker 201.

[0034] Further, in some embodiments, Figure 3 As shown, the bending rocker 201 is arranged at one end of the handle body close to the catheter section 100, and has a spherical connection part 203, and the spherical connection part 203 is connected to the handle body. The spherical connection part 203 can swing and / or rotate at multiple angles relative to the handle body, thereby changing the state of the bending unit to adjust the shape and angle of the bending section 101. Optionally, a Luer connector 204 is also provided on the handle body, one end of which is connected to a plug extraction device or a syringe, and the other end passes through the hollow cavity of the catheter section 100, so as to extract the obstruction 1001 in the catheter.

[0035] Furthermore, in some other embodiments, Fig.11As shown, the bending rocker 201 is arranged at the tail of the handle body and has a spherical connection part 203, and the spherical connection part 203 is connected to the handle body. Optionally, the handle body is also provided with a Luer connector 204, one end of which is connected to the plug extraction device or the syringe, and the other end passes through the hollow cavity of the catheter part 100.

[0036] The above specific implementation methods do not constitute a limitation on the protection scope of the present disclosure. After considering the specification and practicing the technical solutions disclosed in this application, those skilled in the art will easily think of other implementation methods of the present disclosure. This application is intended to cover any modification, use or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the technical field that are not disclosed in the present disclosure. The description and examples are regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

Claims

1. An obstruction suction device, characterized in that: include: A catheter portion (100) and a handle portion (104), wherein the catheter portion (100) is connected to the handle portion (104); the catheter portion (100) comprises a bending adjustment section (101), a transition section (102) and a main section (103) in sequence from the distal end to the proximal end, and the hardness of the bending adjustment section (100) is the smallest; a hollow cavity extending along the axial direction is provided inside the catheter portion (100), a bending adjustment unit is provided inside the hollow cavity, the distal end of the bending adjustment unit is connected to the bending adjustment section (101), and the proximal end is provided on the handle portion (104), and the bending adjustment unit is used to adjust the bending shape of the bending adjustment section (101).

2. An obstruction suction device according to claim 1, characterized in that: The hardness of the bending adjustment section (101), the transition section (102) and the main body section (103) increases in sequence.

3. The obstruction suction device according to claim 1, characterized in that: It also comprises a mounting ring (301), wherein the mounting ring (301) is arranged at the distal end of the bending adjustment section (101); the bending adjustment unit is connected to the mounting ring (301) through the inner wall of the bending adjustment section (101).

4. The obstruction suction device according to claim 3, characterized in that: It also includes a developing ring (302), wherein the developing ring (302) is arranged adjacent to the mounting ring (301).

5. The obstruction suction device according to claim 3, characterized in that: The bending unit comprises a pull wire (202), and the pull wire (202) is connected to the mounting ring (301) through the inner wall of the bending section (101); when the pull wire (202) is in a non-bending state, it is in a relaxed state; when the pull wire (202) is in a bending state, it is in a tensioned state and can cut obstructions.

6. The obstruction suction device according to claim 5, characterized in that: The pulling wire (202) includes one or more pulling wires, and the multiple pulling wires (202) are distributed along the circumferential direction of the bending adjustment section (101).

7. The obstruction suction device according to any one of claims 1 to 6, characterized in that: The conduit portion (100) is a hollow thin-walled structure, and the wall thickness of the conduit portion (100) is greater than or equal to 1 Fr and less than or equal to 2 Fr.

8. The obstruction suction device according to any one of claims 1 to 6, characterized in that: The distal end surface of the catheter portion (100) is perpendicular to the axis of the catheter portion (100), or the distal end surface of the catheter portion (100) is arranged to be inclined relative to the axis of the catheter portion (100).

9. The obstruction suction device according to any one of claims 1 to 6, characterized in that: The handle portion (104) comprises a bending rocker (201), the bending rocker (201) being sleeved on the catheter portion (100) and the bending rocker (201) being partially able to swing inside the handle portion (104), and the proximal end of the bending unit being connected to the bending rocker (201).

10. The obstruction suction device according to any one of claims 1 to 6, characterized in that: The handle portion (104) comprises a bending rocker (201), the bending rocker (201) being arranged adjacent to the catheter portion (100) and the bending rocker (201) being partially capable of swinging inside the handle portion (104), and the proximal end of the bending unit being connected to the bending rocker (201).

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