A suction catheter for interventional surgery

Abstract

The present invention provides an aspiration catheter for interventional surgery, relating to the field of medical device technology, and comprising a catheter body and a protective assembly; the protective assembly comprises a control wire that passes through the catheter body and a protective head disposed at the distal end of the control wire; the protective head is made of silicone, and the proximal periphery of the protective head is provided with a protrusion that protrudes toward the proximal end, for covering the distal sidewall of the catheter body; the control wire and the central portion of the protective head jointly define a cavity for the guide wire to pass through; during the process of conveying the catheter body forward along a blood vessel, the protective head is covered over the distal end of the catheter body. By providing a control wire and a protective head, the present invention allows the protective head to cover the distal end of the catheter body during the conveyance of the catheter body, effectively preventing the catheter body from getting stuck in the bifurcated vessel wall when passing through the bifurcated vessel, causing vascular damage.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a suction catheter used for interventional surgery. Background Art

[0002] Suction catheters operate based on the principle of negative pressure aspiration. During interventional procedures, after the catheter tip is placed within the affected area, the proximal end of the catheter, connected to a suction device, creates a negative pressure environment. This negative pressure draws the thrombus into the catheter and removes it from the body. Compared to traditional open surgery, suction catheters cause less incision and can effectively alleviate symptoms.

[0003] During stroke surgery, suction catheters are used as a treatment method. During use, a guidewire is inserted into the affected area through a puncture of the radial or femoral artery, and the suction catheter is then pushed along the guidewire to the affected area. During this process, due to the large diameter of the suction catheter, there is a large gap between the distal end of the suction catheter and the guidewire. When passing through a vascular bifurcation, the distal end of the suction catheter is prone to hitting the vessel wall at the bifurcation, which is generally referred to as the "windowsill effect." Once the suction catheter is stuck on the vessel wall at the bifurcation, it is difficult for the operator to judge whether the catheter is stuck or not. Continuing to push the suction catheter forward can easily cause vascular spasm or even vascular rupture, causing harm to the patient.

[0004] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a catheter with a head end protection component, which covers the head end of the catheter during the process of pushing the catheter to solve the problem that the catheter is easily stuck on the blood vessel wall at the bifurcation.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A suction catheter for interventional surgery, comprising a catheter body and a protective component;

[0008] The protection assembly includes a control wire passing through the catheter body, and a protection head provided at the distal end of the control wire;

[0009] The protective head is made of silicone, and a protruding portion protruding toward the proximal end is provided on the proximal periphery of the protruding head, and the protruding portion is used to cover the distal side wall of the catheter body;

[0010] The control wire and the middle part of the protection head are both provided with a cavity for the guide wire to pass through;

[0011] During the process of conveying the catheter body forward along the blood vessel, the protective head cover is at the distal end of the catheter body.

[0012] Preferably, the wall thickness of the protrusion gradually shrinks from the distal end to the proximal end.

[0013] Preferably, the protective head is provided with a plurality of communication cavities connected to the interior of the catheter body, and the protective head is provided with a support tube located in the communication cavity.

[0014] Preferably, the outer ring of the protrusion is provided with a tightening ring.

[0015] Preferably, the constricting ring is a ring made of nickel-titanium alloy wire, and in a natural state, the diameter of the constricting ring is smaller than the diameter of the catheter body.

[0016] Preferably, the distal end of the protective head is configured to be in an arc shape.

[0017] Preferably, a detachable synchronization component is further included, wherein the detachable synchronization component is used to maintain synchronization between the catheter body and the control wire, and the catheter body and the control wire can move relative to each other after the detachable synchronization component is disconnected.

[0018] Preferably, the detachable synchronization component includes an internal thread provided at the proximal end of the inner wall of the catheter body and an external thread provided at the proximal end of the outer wall of the control wire, and the external thread is adapted to the internal thread.

[0019] Preferably, the detachable synchronization component includes a friction member provided at a proximal gap between the catheter body and the control wire, and the friction member synchronizes the catheter body and the control wire through frictional resistance.

[0020] Preferably, a recessed portion is provided on the distal side wall of the catheter body, and a developing ring located on the recessed portion is provided on the catheter body.

[0021] Beneficial effects:

[0022] (1) The present invention provides a protective head to cover the distal opening of the catheter body, thereby preventing the catheter body from getting stuck in the bifurcated blood vessel wall when passing through the bifurcated blood vessel, thereby effectively protecting the blood vessel and reducing damage to the blood vessel;

[0023] (2) The present invention controls the protective head by setting a control wire, which is pushed forward to release the connection and pulled backward to withdraw the protective head from the catheter body, making the withdrawal of the protective head convenient and stable;

[0024] (3) The present invention provides a tightening ring made of elastic material. In a natural state, the tightening ring applies a radial force toward the middle of the protrusion to assist the protrusion in shrinking, so that the protrusion can be easily retracted into the catheter body after being disconnected from the distal end of the catheter body, thereby facilitating the recovery of the protective head. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0026] Figure 1 This is a schematic structural diagram of an aspiration catheter for interventional surgery before use and during advancement within a blood vessel according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic structural diagram of an aspiration catheter for interventional surgery after a control wire is pushed forward according to an embodiment of the present invention;

[0028] Figure 3 for Figure 1 Cross-sectional structural diagram;

[0029] Figure 4 for Figure 2 Cross-sectional structural diagram;

[0030] Figure 5 This is a schematic cross-sectional view of the protective head after it is retracted into the catheter body in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of the aspiration catheter for interventional surgery provided in Example 2 of the present invention before use and during advancement within a blood vessel.

[0032] In the figure: 1. Catheter body; 11. Recessed portion; 12. Development ring; 2. Control wire; 3. Protective head; 31. Protruding portion; 32. Connecting cavity; 33. Support tube; 34. Clamping ring; 4. Cavity; 5. Removable synchronization component. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two elements, indirect communication, or an interactive relationship between two elements.

[0038] In the description of the present invention, the "distal end" refers to the end farther from the doctor during surgery, and the "proximal end" refers to the end closer to the doctor during surgery.

[0039] In the description of the present invention, "before use" refers to the state in which the suction catheter used for interventional surgery has not been used, has not entered the human body, or has not come into contact with body fluids such as blood, tissue fluid, etc. in the human body; and "during use" refers to the state in which the suction catheter used for interventional surgery has entered the human body or has come into contact with body fluids such as blood, tissue fluid, etc. in the human body.

[0040] In the description of the present invention, the "in vivo environment" refers to the environment below the epidermis of the skin where body fluids exist, such as the dermis and subcutaneous tissue, or the inside of blood vessels and organs.

[0041] The present invention will be described in detail below with reference to the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict.

[0042] The present invention addresses the problem in the prior art that, during the pushing process of the suction catheter, the tip of the suction catheter is easily stuck on the blood vessel wall at the bifurcation due to a large gap between the tip of the suction catheter and the guide wire, causing vascular spasm or even rupture.

[0043] The present invention provides a suction catheter for interventional surgery, such as Figures 1 to 4 As shown, it includes a catheter body 1 and a protection component;

[0044] The protection assembly includes a control wire 2 passing through the catheter body 1 and a protection head 3 provided at the distal end of the control wire 2;

[0045] The protective head 3 is made of silicone. The outer periphery of the proximal end of the protective head 3 is provided with a protruding portion 31 protruding toward the proximal end, which is used to cover the distal side wall of the catheter body 1;

[0046] The middle of the control wire 2 and the protection head 3 is provided with a cavity 4 for the guide wire to pass through;

[0047] During the process of transporting the catheter body 1 forward along the blood vessel, the protective head 3 is sheathed on the distal end of the catheter body 1 .

[0048] The catheter body 1 is preferably made of PTFE, which has good biocompatibility and strength. The control wire 2 is preferably made of stainless steel, which has high strength and high tolerance to the human body environment, ensuring control stability.

[0049] The middle of the catheter body 1 is provided with a cavity running through the catheter body along its length. The cross-sectional shape of the cavity is preferably circular, but can also be triangular, square, or other centrally symmetrical shapes. The control wire 2 passes through the cavity and can slide along the cavity.

[0050] The protective head 3 is made of silicone material, which has a low impact on the intravascular environment. The protective head 3 is soft in texture, and when the protective head 3 contacts the vascular wall at the bifurcation, it can be squeezed and slightly deformed to reduce damage to the vascular wall at the bifurcation. At the same time, the protective head 3 can block the space between the guide wire and the catheter body 1 to prevent the catheter body 1 from getting stuck on the vascular wall at the bifurcation. The proximal periphery of the protective head 3 protrudes toward the proximal end to form a protrusion 31, and the protrusion 31 and the protective head 3 are an integral structure. The distal end of the protective head 3 is in the shape of a mushroom umbrella, which is used to block the distal end of the catheter body 1.

[0051] It should be noted that the protective head 3 is deformable under stress and has a certain degree of elasticity. When unaffected by external forces, the diameter of the protrusion 31 is smaller than the inner diameter of the catheter body 1. After the protrusion 31 is separated from the catheter body 1, it naturally shrinks, reducing the diameter of the proximal end of the protective head 3 to allow it to pass through the cavity of the catheter body 1.

[0052] The middle portion of the protection head 3 is bonded and fixed to the control wire 2 , and the protection head 3 can be controlled to move toward the proximal end or the distal end during the process of pushing and pulling the control wire 2 .

[0053] A lumen 4 for the guide wire to pass through is defined in the middle of the control wire 2, and a lumen 4 for the guide wire to pass through is also defined in the middle of the protective head 3. The two lumens 4 are connected, and the guide wire can pass through the control wire 2 and the protective head 3 in sequence. The guide wire is used to guide the catheter body 1, reducing the difficulty of delivery.

[0054] like Figures 1 to 5 As shown, before use, the protrusion 31 is radially extended outward and placed over the distal end of the catheter body 1, with the protective head 3 sealing the distal opening of the catheter body 1. The catheter body 1 is then pushed distally along the guidewire. As it passes through the bifurcation, the protective head 3 contacts the vessel wall, while the distal end of the catheter body 1, covered by the protective head 3, does not come into contact with the vessel wall, thereby preventing the catheter body 1 from becoming stuck in the bifurcation. Furthermore, the softness of the protective head 3 effectively reduces damage to the vessel wall at the bifurcation.

[0055] After reaching the proximal end of the thrombus, the catheter body 1 and the control wire 2 are withdrawn 40-50mm, and then the control wire 2 is pushed distally. The control wire 2 applies a distal force to the middle part of the protective head 3, causing relative sliding between the protrusion 31 and the distal side wall of the catheter body 1. After the protrusion 31 is separated from the catheter body 1, it shrinks radially and sticks to the control wire 2. At this time, the control wire 2 is pulled proximally to allow the protrusion 31 and the protective head 3 to enter the cavity of the catheter body 1 together, and the control wire 2 is continued to be pulled proximally to remove the control wire 2 and the protective head 3. At this time, the catheter body 1 is pushed forward so that the distal end of the catheter body 1 is close to the thrombus, and the positioning of the catheter body is completed. By setting the protective head 3 to cover the distal opening of the catheter body 1, the catheter body 1 is prevented from being stuck in the bifurcated blood vessel wall when passing through the bifurcated blood vessel, solving the "window sill effect", effectively protecting the blood vessel, and reducing damage to the blood vessel. By adopting the control wire 2 to withdraw the protective head 3, the withdrawal of the protective head 3 is convenient and stable, and the protective head 3 is prevented from affecting the subsequent work of the catheter body 1.

[0056] In a preferred embodiment of the present invention, the wall thickness of the protrusion 31 gradually decreases from the distal end to the proximal end. After the control wire 2 is pushed out and the protrusion 31 is disconnected from the distal end of the catheter body 1, the protrusion 31 shrinks to form a thinner proximal end, which facilitates the withdrawal of the catheter body 1.

[0057] In a preferred embodiment of the present invention, a plurality of connecting cavities 32 connected to the interior of the catheter body 1 are provided on the protective head 3, and a support tube 33 located in the connecting cavity 32 is provided on the protective head 3. The support tube 33 is made of PTFE and has a certain hardness, and is used to ensure that the connecting cavity 32 will not be blocked due to extrusion deformation when deformed. By providing the connecting cavity 32, the interior of the catheter body 1 and the interior of the blood vessel can be connected, reducing the possibility of the catheter body 1 being deformed by the pressure in the blood vessel. At the same time, blood can flow out through the connecting cavity 32. When blood does not flow out, it can assist in judging that the distal end of the catheter body 1 is located at the thrombus, playing an auxiliary judgment role. In the process of recovering the protective head 3, the proximal end of the connecting cavity 32 may be blocked by the protrusion 31. After the blockage, the blood flow will not flow out of the connecting cavity 32, automatically achieving the reduction of blood loss.

[0058] In a preferred embodiment of the present invention, a constricting ring 34 is provided around the outer ring of the protrusion 31. Made of an elastic material, constricting ring 34 exerts a radial force toward the center of the protrusion 31 in its natural state, assisting in its contraction and facilitating its retraction into the catheter body 1, thereby facilitating the recovery of the protective head 3. During installation, constricting ring 34 is radially extended and placed around the outer edge of the protrusion 31, thereby constricting the protrusion 31.

[0059] In a preferred embodiment of the present invention, the constricting ring 34 is made of nickel-titanium alloy wire, and in a natural state, the diameter of the constricting ring 34 is smaller than the diameter of the catheter body 1. The natural state here refers to the state of the constricting ring 34 without external interference.

[0060] In a preferred embodiment of the present invention, the distal end of the protective head 3 is configured to be arc-shaped. The arc-shaped distal end of the protective head 3 is smoother and can effectively reduce the squeezing force on the inner wall of the blood vessel, thereby reducing damage to the blood vessel.

[0061] In a preferred embodiment of the present invention, a detachable synchronization component 5 is further included. The detachable synchronization component 5 is used to maintain synchronization between the catheter body 1 and the control wire 2. After the detachable synchronization component 5 is disconnected, the catheter body 1 and the control wire 2 can move relative to each other.

[0062] In a preferred embodiment of the present invention, the detachable synchronization assembly 5 includes an internal thread proximal to the inner wall of the catheter body 1 and an external thread proximal to the outer wall of the control wire 2, with the external thread mateable with the internal thread. By providing this threaded connection, the control wire 2 can be rotated to achieve relative movement between the catheter body 1 and the control wire 2. Furthermore, after the threaded connection is released by rotating a certain distance, the catheter body 1 and the control wire 2 can continue to move relative to each other. It is important to note that the internal and external threads are located outside the patient's body.

[0063] In a preferred embodiment of the present invention, the detachable synchronization component 5 includes a friction member provided in the proximal gap between the catheter body 1 and the control wire 2. The friction member synchronizes the catheter body 1 and the control wire 2 through frictional resistance. The friction member is cylindrical with one end open. The friction member is inserted into the gap between the catheter body 1 and the control wire 2 and abuts against the catheter body 1 and the control wire 2, respectively. The friction member can be made of a rubber material. After insertion, the friction member synchronizes the catheter body 1 and the control wire 2 through friction. When the friction member needs to be removed, the friction member can be directly pulled out, making the installation and removal of the friction member convenient, thereby allowing the doctor to conveniently control whether the catheter body 1 and the control wire 2 are synchronized.

[0064] In a preferred embodiment of the present invention, a recessed portion 11 is provided on the distal sidewall of the catheter body 1, and a developing ring 12 is positioned within the recessed portion 11. The recessed portion 11 is a radially inward groove extending inward along the middle portion. By welding the developing ring 12 to the recessed portion 11, the diameter of the developing portion is aligned with the diameter of the rest of the catheter body 1, minimizing its impact on passability. The developing ring 12 can be made of a nickel-titanium alloy or a platinum-iridium alloy. The position of the developing ring 12 is displayed on the DSA device, assisting the physician in determining the position of the distal end of the catheter body 1.

[0065] In a preferred embodiment of the present invention, a hydrophilic coating is provided on the inner wall of the cavity of the catheter body 1. More specifically, the hydrophilic coating is a hydrogel coating, which can form a water film on the surface to reduce surface friction and facilitate the sliding of the control wire 2.

[0066] The following describes in detail a suction catheter for interventional surgery according to the present invention through specific embodiments.

[0067] Example 1

[0068] This embodiment provides a suction catheter for interventional surgery, such as Figures 1 to 4 As shown, it includes a catheter body 1 and a protection component;

[0069] A cavity is provided in the middle of the catheter body 1 and extends through the catheter body 1 in its longitudinal direction. A hydrophilic coating is provided on the sidewalls of the cavity to reduce the surface friction of the cavity sidewalls.

[0070] The protection assembly includes a control wire 2 passing through the cavity of the catheter body 1, and a protection head 3 is bonded to the distal end of the control wire 2;

[0071] The protective head 3 is made of silicone, which is soft and elastic, and has minimal damage to the blood vessel wall. A protrusion 31 is integrally formed on the proximal periphery of the protective head 3. The protrusion 31 protrudes toward the proximal end and is used to cover the distal side wall of the catheter body 1.

[0072] The middle of the control wire 2 and the protection head 3 is provided with a cavity 4 for the guide wire to pass through;

[0073] During the process of conveying the catheter body 1 forward along the blood vessel, the protective head 3 is sheathed on the distal end of the catheter body 1. Before use, the protective head 3 is first sheathed on the distal end of the catheter body 1, and the proximal end of the guidewire passes through the protective head 3 and the catheter body 1.

[0074] The catheter body 1 is preferably made of PTFE, which has good biocompatibility and strength. The control wire 2 is preferably made of stainless steel, which has high strength and high tolerance to the human body environment, ensuring control stability.

[0075] The protective head 3 defines several communication cavities 32 that connect to the interior of the catheter body 1. A support tube 33, preferably made of PTFE and possessing a certain degree of rigidity, is positioned within the communication cavities 32 to prevent occlusion of the communication cavities 32. The provision of the communication cavities 32 allows the interior of the catheter body 1 to communicate with the blood vessel, reducing the possibility of deformation of the catheter body 1 due to intravascular pressure. Blood can flow out of the communication cavities 32. If blood does not flow out, it can assist in determining whether the distal end of the catheter body 1 is located at the site of a thrombus, thus assisting in diagnosis.

[0076] In this embodiment, the distal end of the protective head 3 is configured to be arc-shaped. The arc-shaped distal end of the protective head 3 is smoother and can effectively reduce the squeezing force on the inner wall of the blood vessel, thereby reducing damage to the blood vessel.

[0077] The catheter body 1 and the control wire 2 are synchronized with each other. After the detachable synchronization component 5 is disconnected, the catheter body 1 and the control wire 2 can move relative to each other.

[0078] The detachable synchronization assembly 5 comprises an internal thread proximal to the inner wall of the catheter body 1 and an external thread proximal to the outer wall of the control wire 2, with the external thread matching the internal thread. By creating this threaded connection, rotating the control wire 2 enables relative movement between the catheter body 1 and the control wire 2. Furthermore, after rotating a certain distance to release the threaded connection, the catheter body 1 and the control wire 2 can continue to move relative to each other. It is important to note that the internal and external threads are located outside the patient's body.

[0079] The distal sidewall of the catheter body 1 is provided with a recessed portion 11, on which a developing ring 12 is positioned. The recessed portion 11 is a radially inward groove extending inward in the middle. By welding the developing ring 12 to the recessed portion 11, the diameter of the developing portion is aligned with the diameter of the rest of the catheter body 1, minimizing its impact on passability. The developing ring 12 can be made of a nickel-titanium alloy or a platinum-iridium alloy. The position of the developing ring 12 is displayed on the DSA device, assisting the physician in determining the position of the distal end of the catheter body 1.

[0080] Reference Figures 1 to 5 As shown, before use, the protrusion 31 is radially extended outward and placed over the distal end of the catheter body 1, with the protective head 3 sealing the distal opening of the catheter body 1. The catheter body 1 is then pushed distally along the guidewire. As it passes through the bifurcation, the protective head 3 contacts the vessel wall, while the distal end of the catheter body 1, covered by the protective head 3, does not come into contact with the vessel wall, thereby preventing the catheter body 1 from becoming stuck in the bifurcation. Furthermore, the softness of the protective head 3 effectively reduces damage to the vessel wall at the bifurcation.

[0081] After reaching the proximal end of the thrombus, the catheter body 1 and control wire 2 are withdrawn 40-50 mm. The control wire 2 is then rotated to release synchronization with the catheter body and pushed distally. The control wire 2 applies a distal force to the middle portion of the protective head 3, causing relative sliding between the protrusion 31 and the distal sidewall of the catheter body 1. After the protrusion 31 separates from the catheter body 1, it contracts radially and adheres to the control wire 2. At this time, the control wire 2 is pulled proximally, allowing the protrusion 31 and the protective head 3 to enter the cavity of the catheter body 1. The control wire 2 is further pulled proximally, and when passing through the threaded connection, the control wire 2 is rotated continuously to release the threaded connection. The control wire 2 is then pulled to remove the control wire 2 and protective head 3. The catheter body 1 is pushed forward so that the distal end of the catheter body 1 is close to the thrombus, completing the positioning of the catheter body. By providing a protective head 3 to cover the distal opening of the catheter body 1, the catheter body 1 is prevented from getting stuck on the bifurcated vessel wall when passing through it, resolving the "window sill effect," effectively protecting the vessel and reducing damage. By using a control wire 2 to retract the protective head 3, the retraction is convenient and stable, preventing it from interfering with subsequent operation of the catheter body 1.

[0082] Example 2

[0083] Based on Example 1, this embodiment further illustrates the protrusion 31 , and the wall thickness of the protrusion 31 gradually shrinks from the distal end to the proximal end.

[0084] A closing ring 34 is sleeved on the outer wall of the protrusion 31. The closing ring 34 is made of nickel-titanium alloy and has a certain elasticity. Its diameter in the natural state is smaller than the diameter of the cavity of the catheter body 1. The closing ring 34 applies a radial force toward the middle to the protrusion 31, promoting the contraction of the protrusion 31 after it is separated from the catheter body 1, making it convenient for the protrusion 31 to be retracted into the catheter body 1 and to facilitate the withdrawal of the protective head 3. At the same time, the nickel-titanium alloy has good developing properties, and the position of the closing ring 34 can be clearly judged under the DSA equipment. When in use, the positional relationship between the closing ring 34 and the developing ring 12 is judged to assist in judging whether the protrusion 31 is detached from the catheter body 1. Specifically, when the control wire 2 pushes the protective sleeve, the closing ring 34 moves relative to the developing ring 12. After the closing ring 34 passes through the developing ring 12, it can assist in judging whether the protrusion 31 is detached.

[0085] Example 3

[0086] This embodiment further illustrates the detachable synchronization component 5 based on the embodiment 1. Figure 6The detachable synchronization component 5 includes a friction member provided in the proximal gap between the catheter body 1 and the control wire 2. The friction member synchronizes the catheter body 1 and the control wire 2 through frictional resistance. The friction member is cylindrical with one end open. The friction member is inserted into the gap between the catheter body 1 and the control wire 2 and abuts against the catheter body 1 and the control wire 2 respectively. The friction member can be made of rubber material. After insertion, the friction force synchronizes the catheter body 1 and the control wire 2. When the friction member needs to be removed, it can be directly pulled out, making the installation and removal of the friction member convenient, thereby allowing the doctor to conveniently control whether the catheter body 1 and the control wire 2 are synchronized.

[0087] In summary, the present invention provides a protective head 3 covering the distal opening of the catheter body 1, preventing the catheter body 1 from becoming stuck on the bifurcated vessel wall when traversing it, resolving the "window sill effect," effectively protecting the vessel and reducing damage. The use of a control wire 2 to retract the protective head 3 facilitates and stabilizes its removal, preventing it from interfering with subsequent operation of the catheter body 1.

[0088] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A suction catheter for interventional surgery, characterized in that: It comprises a catheter body (1) and a protective component; The protection assembly comprises a control wire (2) passing through the catheter body (1), and a protection head (3) provided at the distal end of the control wire (2); The protective head (3) is made of silicone, and a protruding portion (31) protruding toward the proximal end is provided on the proximal periphery of the protective head (3), and the protruding portion (31) is used to cover the distal side wall of the catheter body (1); The control wire (2) and the protective head (3) are both provided with a cavity (4) in the middle thereof for the guide wire to pass through; During the process of conveying the catheter body (1) forward along the blood vessel, the protective head (3) is sheathed on the distal end of the catheter body (1), and the wall thickness of the protrusion (31) gradually shrinks from the distal end to the proximal end; the protective head (3) is provided with a plurality of communication cavities (32) connected to the interior of the catheter body (1), and the protective head (3) is provided with a support tube (33) located in the communication cavities (32); the outer ring of the protrusion (31) is provided with a constricting ring (34); The distal end of the protective head (3) is configured to be in an arc shape; The device further comprises a detachable synchronization component (5), wherein the detachable synchronization component (5) is used to maintain synchronization between the catheter body (1) and the control wire (2), and the catheter body (1) and the control wire (2) can move relative to each other after the detachable synchronization component (5) is disconnected; The detachable synchronization component (5) includes an internal thread provided at the proximal end of the inner wall of the catheter body (1) and an external thread provided at the proximal end of the outer wall of the control wire (2), wherein the external thread is adapted to the internal thread; or, the detachable synchronization component (5) includes a friction member provided at the proximal end gap between the catheter body (1) and the control wire (2), wherein the friction member synchronizes the catheter body (1) and the control wire (2) through friction resistance.

2. The suction catheter for interventional surgery according to claim 1, characterized in that: The constricting ring (34) is a ring made of nickel-titanium alloy wire. In a natural state, the diameter of the constricting ring (34) is smaller than the diameter of the catheter body (1).

3. The suction catheter for interventional surgery according to claim 1 or 2, characterized in that: A recessed portion (11) is provided on the distal side wall of the catheter body (1), and a developing ring (12) located on the recessed portion (11) is provided on the catheter body (1).

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