Multi-cavity suction catheter with adjustable opening

Abstract

The invention provides a multi-cavity suction catheter with an adjustable opening, and relates to the technical field of medical instruments. The guide assembly is arranged on the catheter main body and is used for guiding the catheter main body; a suction inner cavity is formed in the catheter body in the axial direction in a penetrating mode, the guide assembly comprises a communicating pipe arranged on the side wall of the catheter body, the communicating pipe penetrates through the length direction of the catheter body, a guide wire penetrates through the suction inner cavity and the communicating pipe, and a protruding part with the diameter gradually changing in the axial direction is arranged at the far end of the guide wire. A flexible section is arranged at the far end of the communicating pipe, and the diameter of the flexible section is changed when the protruding part passes through the flexible section, so that the opening size of the suction inner cavity is changed. According to the thrombus aspirator, the protruding part of the guide wire makes contact with the flexible section, the flexible section deforms so that the flexible section can be expanded or shrunk, the opening of the aspiration inner cavity can be adjusted to be matched with the thrombus in size, suction force is more concentrated on the thrombus, and waste of the suction force is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field, and in particular relates to a multi-lumen suction catheter with adjustable openings. Background Art

[0002] In the treatment of vascular diseases, especially in the interventional treatment of acute myocardial infarction and acute ischemic stroke, the suction catheter is used to extract blood clots in the blood vessels. For example, during percutaneous coronary intervention (PCI) for patients with acute myocardial infarction, the blood clots can be directly aspirated at the lesion site by inserting the suction catheter into the coronary artery, which can quickly restore myocardial blood perfusion. For patients with acute ischemic stroke, the suction catheter is sent to the blocked blood vessels in the brain to aspirate the blood clots that block the blood vessels, which can promptly restore blood supply to the brain tissue and reduce the scope of cerebral infarction.

[0003] In the prior art, a guide wire is first placed in the blood vessel, and the suction catheter is advanced along the guide wire to the embolism site. The guide wire is then removed, and suction is performed using a negative pressure device to form a negative pressure to draw the thrombus into the suction catheter. The suction catheter and the blood vessel are then removed together. During the catheter suction process, it is necessary to maintain sufficient suction force, otherwise it is difficult to draw the thrombus into the catheter, and in some cases the thrombus may break and enter the more distal thrombus, causing blockage and causing serious consequences. However, in the prior art, since the power of the suction device is constant, the length of the suction catheter is relatively long, and the opening size is certain, this leads to the following problems: the larger opening cannot completely fit the thrombus, resulting in part of the suction force being wasted, the suction force cannot be guaranteed, and the thrombus may not be sucked out.

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

[0005] The purpose of the present invention is to provide a multi-lumen suction catheter with adjustable opening, which controls the opening size of the suction lumen by controlling the guide wire to solve the problem that the opening size is fixed, which leads to the larger opening not being able to fully fit the thrombus, resulting in part of the suction force being wasted, the suction force cannot be guaranteed, and the thrombus may not be sucked out.

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

[0007] A multi-lumen suction catheter with adjustable opening, comprising a catheter body;

[0008] A guide assembly, disposed on the catheter body, for guiding the catheter body;

[0009] A fixing assembly is arranged on the catheter body and is attached to the blood vessel wall to fix the catheter body after the catheter body is in place;

[0010] A suction lumen is axially penetrated on the catheter body, and the guide assembly includes a connecting tube arranged on the side wall of the catheter body, the connecting tube is arranged to penetrate the length direction of the catheter body, one end of the connecting tube is connected to the negative pressure device, and the other end penetrates the distal end of the catheter body, a guide wire is passed through the connecting tube, and a protrusion whose diameter gradually changes along the axial direction is provided at the distal end of the guide wire, and a flexible section is provided at the distal end of the connecting tube, and the diameter of the flexible section is changed when the protrusion passes through the flexible section, thereby changing the opening size of the suction lumen.

[0011] Preferably, the flexible section is one of medical silica gel or PU film, and gas is not allowed to pass through the flexible section from the suction cavity.

[0012] Preferably, a limiting ring is provided on the catheter body and is coaxial with the connecting tube, and the guide wire is arranged in a straight line and passes through the limiting ring and the connecting tube in sequence.

[0013] Preferably, the limiting ring is a cylindrical structure fixed on the inner wall of the catheter body, and a cavity for the guide wire to pass through is opened in the middle of the limiting ring.

[0014] Preferably, the limiting rings are a plurality of circular rings arranged on the inner wall of the catheter body, and the circular rings are distributed at equal intervals.

[0015] Preferably, the fixing assembly comprises a filling channel provided on the catheter body, and a fixing balloon provided on the catheter body, wherein an inner cavity formed by the fixing balloon is in communication with the filling channel.

[0016] Preferably, the distal end of the catheter body is designed to be oblique.

[0017] Preferably, a developing ring is embedded in the distal end of the catheter body, and the developing ring has the same outer diameter as the catheter body.

[0018] Preferably, the end of the guide wire is provided with a developing point formed by winding nickel-titanium wire.

[0019] Preferably, the distal end of the developing point is configured to be umbrella-shaped.

[0020] Beneficial effects:

[0021] (1) The present invention arranges the connecting tube inside the catheter body, and the connecting tube occupies a certain volume of the distal end of the suction catheter, so that the distal opening area of ​​the suction inner cavity is reduced, thereby ensuring suction force and improving the suction effect on the thrombus. After the catheter body is in place, the guide wire is withdrawn toward the proximal end, and the protruding portion of the guide wire contacts the flexible section, causing the flexible section to deform, so that the flexible section expands or shrinks, thereby controlling the size of the suction inner cavity opening, adjusting the suction inner cavity opening to a size suitable for the thrombus, and concentrating the suction force more on the thrombus, reducing the waste of suction force, and improving the suction effect on the thrombus;

[0022] (2) The present invention adopts an oblique tip, which is conducive to the distal end of the catheter body being closer to the blood vessel wall, and can more effectively contact and suck the thrombus when aspirating the thrombus;

[0023] (3) Compared with the prior art, the inner cavity of the connecting tube of the present invention is separated from the inner cavity of the suction, so there is no need to completely withdraw the guide wire during suction, thereby improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0025] Figure 1 It is a schematic diagram of the overall structure of the suction catheter in an embodiment of the present invention;

[0026] Figure 2 It is a schematic cross-sectional view of the overall structure of the suction catheter in an embodiment of the present invention;

[0027] Figure 3 It is a schematic cross-sectional view of the overall structure of the suction catheter in other embodiments of the present invention;

[0028] Figure 4 It is a schematic cross-sectional view of the overall structure of the suction catheter after the guidewire is partially withdrawn in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of a guide wire in an embodiment of the present invention;

[0030] Figure 6 It is a schematic cross-sectional view of the overall structure of the suction catheter in Example 2 of the present invention.

[0031] In the figure: 1. catheter body; 11. suction inner cavity; 12. limiting ring; 2. connecting tube; 21. flexible section; 3. guide wire; 31. protrusion; 32. developing point; 4. filling channel; 5. fixing balloon; 6. developing ring. DETAILED DESCRIPTION

[0032] 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 belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated 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 connection between two elements, indirect connection, or an interactive relationship between two elements.

[0037] 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.

[0038] In the description of the present invention, "before use" refers to a state in which the multi-lumen suction catheter with adjustable opening 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 a state in which the multi-lumen suction catheter with adjustable opening has entered the human body or has come into contact with body fluids such as blood, tissue fluid, etc. in the human body.

[0039] In the description of the present invention, "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.

[0040] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0041] The present invention aims to solve the problem in the prior art that, due to the fixed power of the suction device, the length of the suction catheter is relatively long and the size of the opening is fixed, the larger opening cannot completely fit the thrombus, resulting in part of the suction force being wasted, the suction force cannot be guaranteed, and the thrombus may not be sucked out.

[0042] The present invention provides a multi-lumen suction catheter with adjustable opening, referring to Figure 1 and Figure 2 , comprising a catheter body 1;

[0043] A guide assembly, disposed on the catheter body 1, and used for guiding the catheter body 1;

[0044] A fixing component is arranged on the catheter body 1, and after the catheter body 1 is in place, it adheres to the blood vessel wall and fixes the catheter body 1;

[0045] A suction lumen 11 is axially penetrated on the catheter body 1, and the guide assembly includes a connecting tube 2 arranged on the side wall of the catheter body 1. The connecting tube 2 is arranged to penetrate the length direction of the catheter body 1, one end of which is connected to the negative pressure device, and the other end penetrates the distal end of the catheter body 1. A guide wire 3 is passed through the suction lumen 11 and the connecting tube 2. The distal end of the guide wire 3 is provided with a protrusion 31 whose diameter gradually changes along the axial direction. The distal end of the connecting tube 2 is provided with a flexible section 21. When the protrusion 31 passes through the flexible section 21, the diameter of the flexible section 21 is changed, thereby changing the opening size of the suction lumen 11.

[0046] Reference Figure 1 , Figure 2 and Figure 4 The catheter body 1 is a tubular structure made of medical polyurethane. Polyurethane has good biocompatibility and is not prone to causing adverse reactions such as inflammation after entering the blood vessel. Polyurethane is also very flexible, allowing the catheter body 1 to have good permeability. In other embodiments of the present application, for example, in blood vessels with lower biocompatibility requirements, the catheter body 1 can be made of PVC material.

[0047] The cross-section of the suction lumen 11 can be one or more of tubular, pentagonal, triangular, square, rectangular and the like, and the suction lumen 11 only needs to penetrate the catheter body 1 in the length direction.

[0048] The connecting tube 2 is arranged on the side wall of the catheter body 1 , one end of the connecting tube 2 is connected to the suction lumen 11 , and the other end is connected to the distal end. The guide wire 3 passes through the suction lumen 11 and the connecting tube 2 .

[0049] The guide wire 3 is preferably made of stainless steel and has a certain hardness. The protrusion 31 is integrally formed with the guide wire 3. The cross section of the protrusion 31 is arc-shaped, and the radial diameter gradually changes along different axial positions.

[0050] When in use, the guide wire 3 passes through the suction lumen 11 and the connecting tube 2 to push the catheter body 1. At this time, the protrusion 31 of the guide wire 3 is located at the distal end of the catheter body 1 and will not affect the advancement of the catheter body 1. The catheter body 1 is allowed to advance along the guide wire 3. By providing the connecting tube 2, the integration of the guide wire 3 and the catheter body 1 is improved, thereby improving the guiding effect and the placement rate.

[0051] By setting the connecting tube 2 inside the catheter body 1, the connecting tube 2 occupies a certain volume of the distal end of the suction catheter, so that the distal opening area of ​​the suction lumen 11 is reduced, thereby ensuring the suction force and improving the suction effect on the thrombus. After the catheter body 1 is in place, the guide wire 3 is withdrawn toward the proximal end, and the protrusion 31 of the guide wire 3 contacts the flexible section 21, so that the flexible section 21 is deformed, so that the flexible section 21 expands or shrinks, thereby controlling the size of the opening of the suction lumen 11, adjusting the opening of the suction lumen 11 to a size that matches the thrombus, and concentrating the suction force more on the thrombus, reducing the waste of suction force, and improving the suction effect on the thrombus. At the same time, compared with the prior art, the inner cavity of the connecting tube 2 in the present invention is separated from the suction lumen 11, and there is no need to completely withdraw the guide wire 3 during suction, which improves convenience.

[0052] In a preferred embodiment of the present invention, the flexible section 21 is one of medical silica gel or PU film, and the gas is not allowed to pass through the flexible section 21 from the suction inner cavity 11. The gas cannot pass through the flexible section 21 and will be concentrated at the opening of the suction inner cavity 11, thereby increasing the suction force. The flexible section 21 meets certain elasticity and sealing properties, can be easily adjusted, and reduces the difficulty of adjustment.

[0053] In a preferred embodiment of the present invention, a limiting ring 12 is provided on the catheter body 1 on the same axis as the connecting tube 2, and the guide wire 3 is arranged in a straight line and sequentially passes through the limiting ring 12 and the connecting tube 2. The limiting ring 12 is used to enhance the stability of the connecting tube 2 and prevent the guide wire 3 from bending and affecting the delivery during the forward delivery of the catheter body 1.

[0054] Reference Figure 1 , Figure 3 and Figure 4 In a preferred embodiment of the present invention, the limiting ring 12 is a cylindrical structure fixed on the inner wall of the catheter body 1, and a cavity is provided in the middle of the limiting ring 12 for the guide wire 3 to pass through. The cylindrical limiting ring 12 can fully support the connecting tube 2, reduce the possibility of bending of the connecting tube 2, and improve the stability during operation.

[0055] Reference Figure 1 , Figure 2 and Figure 4In a preferred embodiment of the present invention, the limiting ring 12 is a plurality of circular rings arranged on the inner wall of the catheter body 1, and the circular rings are evenly spaced. The arrangement of the circular ring structure improves the stability of the connecting pipe 2 on the one hand, and reduces the influence on the passability of the catheter body 1 on the other hand.

[0056] In a preferred embodiment of the present invention, the fixing assembly includes a filling channel 4 provided on the catheter body 1, and a fixing balloon 5 provided on the catheter body 1, and the inner cavity formed by the fixing balloon 5 is connected to the filling channel 4. A contrast agent is injected through the filling channel 4 to expand the fixing balloon 5, so as to fix the catheter body 1 after the catheter body 1 is in place, and temporarily block the blood vessel to make the suction more stable.

[0057] In a preferred embodiment of the present invention, the distal end of the catheter body 1 is designed to be oblique. Specifically, the inclination angle is 30°-45°, and the oblique head is used, which is conducive to the distal end of the catheter body 1 being closer to the blood vessel wall, and can more effectively contact and suck the thrombus when aspirating the thrombus.

[0058] In a preferred embodiment of the present invention, a developing ring 6 is embedded in the distal end of the catheter body 1, and the developing ring 6 has the same outer diameter as the catheter body 1. A groove is provided at the distal end of the catheter body 1, and the developing ring 6 is arranged in the groove. The outer side of the developing ring 6 is flush with the outer side of the catheter body 1 to avoid the existence of a window sill, thereby avoiding scratching the blood vessel.

[0059] In a preferred embodiment of the present invention, a developing point 32 formed by winding nickel-titanium wire is provided at the end of the guide wire 3. The developing point 32 can be displayed as a point with a different brightness from other parts under the DSA device, assisting the doctor in determining the position of the guide wire 3.

[0060] In a preferred embodiment of the present invention, the distal end of the imaging point 32 is set to be umbrella-shaped. The distal end of the umbrella-shaped imaging point 32 has good flexibility and less damage to the blood vessel during the movement toward the distal end.

[0061] The following is a detailed description of a multi-lumen suction catheter with adjustable openings according to the present invention through specific embodiments.

[0062] Example 1

[0063] This embodiment provides a multi-lumen suction catheter with adjustable openings. Figure 1 , Figure 2 , Figure 4 and Figure 5 , including a catheter body 1, a guide component and a fixing component.

[0064] The catheter body 1 is a tubular structure made of medical polyurethane. A suction lumen 11 is provided axially through the catheter body 1.

[0065] The guide assembly includes a connecting tube 2 welded to the side wall of the catheter body 1, the connecting tube 2 is arranged to penetrate the length direction of the catheter body 1, one end is connected to the negative pressure device, and the other end penetrates the distal end of the catheter body 1, and a guide wire 3 is passed through the suction lumen 11 and the connecting tube 2. Figure 5 The distal end of the guide wire 3 is provided with a protrusion 31 whose diameter gradually changes along the axial direction, and the distal end of the connecting tube 2 is provided with a flexible section 21. When the protrusion 31 passes through the flexible section 21, the diameter of the flexible section 21 is changed, thereby changing the opening size of the suction lumen 11.

[0066] The cross section of the suction lumen 11 is tubular, and the suction lumen 11 only needs to penetrate the catheter body 1 in the length direction.

[0067] The guide wire 3 is preferably made of stainless steel and has a certain hardness. The protrusion 31 is integrally formed with the guide wire 3. The cross section of the protrusion 31 is arc-shaped, and the radial diameter gradually changes along different axial positions.

[0068] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 When in use, the guide wire 3 passes through the suction lumen 11 and the connecting tube 2 to push the catheter body 1. At this time, the protrusion 31 of the guide wire 3 is located at the distal end of the catheter body 1 and will not affect the advancement of the catheter body 1. The catheter body 1 is allowed to advance along the guide wire 3. By setting the connecting tube 2, the integration of the guide wire 3 and the catheter body 1 is improved, thereby improving the guiding effect and the placement rate.

[0069] By setting the connecting tube 2 inside the catheter body 1, the connecting tube 2 occupies a certain volume of the distal end of the suction catheter, so that the distal opening area of ​​the suction lumen 11 is reduced, thereby ensuring the suction force and improving the suction effect on the thrombus. After the catheter body 1 is in place, the guide wire 3 is withdrawn toward the proximal end, and the protrusion 31 of the guide wire 3 contacts the flexible section 21, so that the flexible section 21 is deformed, so that the flexible section 21 expands or shrinks, thereby controlling the size of the opening of the suction lumen 11, adjusting the opening of the suction lumen 11 to a size that matches the thrombus, and concentrating the suction force more on the thrombus, reducing the waste of suction force, and improving the suction effect on the thrombus. At the same time, compared with the prior art, the inner cavity of the connecting tube 2 in the present invention is separated from the suction lumen 11, and there is no need to completely withdraw the guide wire 3 during suction, which improves convenience.

[0070] In a preferred embodiment of the present invention, the flexible section 21 is medical silicone, and gas is not allowed to pass through the flexible section 21 from the suction inner cavity 11. Gas cannot pass through the flexible section 21 and will be concentrated at the opening of the suction inner cavity 11, thereby increasing the suction force. The flexible section 21 meets certain elasticity and sealing properties, can be easily adjusted, and reduces the difficulty of adjustment.

[0071] In a preferred embodiment of the present invention, a limiting ring 12 is welded on the catheter body 1 on the same axis as the connecting tube 2, and the guide wire 3 is arranged in a straight line and sequentially passes through the limiting ring 12 and the connecting tube 2. The limiting ring 12 is used to enhance the stability of the connecting tube 2 and prevent the guide wire 3 from bending and affecting the delivery during the forward delivery of the catheter body 1.

[0072] Reference Figure 1 , Figure 3 and Figure 4 In a preferred embodiment of the present invention, the limiting ring 12 is a cylindrical structure welded to the inner wall of the catheter body 1, and a cavity is provided in the middle of the limiting ring 12 for the guide wire 3 to pass through. The cylindrical limiting ring 12 can fully support the connecting tube 2, reduce the possibility of bending of the connecting tube 2, and improve the stability during operation.

[0073] In a preferred embodiment of the present invention, the fixing assembly includes a filling channel 4 provided on the catheter body 1, and a fixing balloon 5 provided on the catheter body 1, and the inner cavity formed by the fixing balloon 5 is connected to the filling channel 4. A contrast agent is injected through the filling channel 4 to expand the fixing balloon 5, so as to fix the catheter body 1 after the catheter body 1 is in place, and temporarily block the blood vessel to make the suction more stable.

[0074] The distal end of the catheter body 1 is embedded with a developing ring 6 welded therein, and the developing ring 6 has the same outer diameter as the catheter body 1. The distal end of the catheter body 1 is provided with a groove, and the developing ring 6 is arranged in the groove, and the outer side of the developing ring 6 is flush with the outer side of the catheter body 1 to avoid the existence of a window sill, thereby avoiding scratching the blood vessel.

[0075] In a preferred embodiment of the present invention, a developing point 32 formed by winding nickel-titanium wire is welded at the end of the guide wire 3. The developing point 32 can be displayed as a point with a different brightness from other parts under the DSA device, assisting the doctor in determining the position of the guide wire 3.

[0076] Reference Figure 6 In a preferred embodiment of the present invention, the distal end of the imaging point 32 is shaped like an umbrella. The distal end of the umbrella-shaped imaging point 32 has good flexibility and causes less damage to the blood vessel during the movement toward the distal end.

[0077] Example 2

[0078] Reference Figure 6 The difference between this embodiment and embodiment 1 is that the distal end opening structure of the catheter body 1 is different: the distal end of the catheter body 1 is designed to be oblique. Specifically, the inclination angle is 30°-45°, and the oblique head end is used, which is conducive to the distal end of the catheter body 1 being closer to the blood vessel wall, and can more effectively contact and suck the thrombus when aspirating the thrombus.

[0079] Example 3

[0080] Reference Figure 1 and Figure 2 The difference between this embodiment and embodiment 1 is that the structure of the limiting ring 12 is different: the limiting ring 12 is a plurality of circular rings welded on the inner wall of the catheter body 1, and the circular rings are distributed at equal intervals. The setting of the circular ring structure improves the stability of the connecting pipe 2 on the one hand, and reduces the influence on the passability of the catheter body 1 on the other hand.

[0081] In summary:

[0082] The present invention arranges the connecting tube 2 inside the catheter body 1, and the connecting tube 2 occupies a certain volume of the distal end of the suction catheter, so that the distal opening area of ​​the suction lumen 11 is reduced, thereby ensuring suction and improving the suction effect on the thrombus. After the catheter body 1 is in place, the guide wire 3 is withdrawn toward the proximal end, and the protrusion 31 of the guide wire 3 contacts the flexible section 21, causing the flexible section 21 to deform, so that the flexible section 21 expands or shrinks, thereby controlling the size of the opening of the suction lumen 11, adjusting the opening of the suction lumen 11 to a size that matches the thrombus, concentrating the suction force more on the thrombus, reducing the waste of suction force, and improving the suction effect on the thrombus. At the same time, compared with the prior art, the inner cavity of the connecting tube 2 in the present invention is separated from the suction lumen 11, and there is no need to completely withdraw the guide wire 3 during suction, which improves convenience.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-lumen suction catheter with adjustable opening, characterized in that: It comprises a catheter body (1); A guide assembly, arranged on the catheter body (1) and used for guiding the catheter body (1); A fixing component is arranged on the catheter body (1) and is adapted to fit the catheter body (1) with the blood vessel wall and fix the catheter body (1) after the catheter body (1) is in place; The catheter body (1) is provided with a suction lumen (11) penetrating along the axial direction. The guide assembly comprises a connecting tube (2) arranged on the side wall of the catheter body (1). The connecting tube (2) is arranged to penetrate the length direction of the catheter body (1), one end of which is connected to the negative pressure device, and the other end of which penetrates the distal end of the catheter body (1). A guide wire (3) is passed through the connecting tube (2). The distal end of the guide wire (3) is provided with a protrusion (31) whose diameter gradually changes along the axial direction. The distal end of the connecting tube (2) is provided with a flexible section (21). When the protrusion (31) passes through the flexible section (21), the diameter of the flexible section (21) is changed, thereby changing the opening size of the suction lumen (11).

2. The multi-lumen suction catheter with adjustable opening according to claim 1, characterized in that: The flexible section (21) is made of medical silica gel or PU film, and does not allow gas to pass through the flexible section (21) from the suction cavity (11).

3. The multi-lumen suction catheter with adjustable opening according to claim 2, characterized in that: The catheter body (1) is provided with a limiting ring (12) on the same axis as the connecting tube (2); the guide wire (3) is arranged in a straight line and passes through the limiting ring (12) and the connecting tube (2) in sequence.

4. The multi-lumen suction catheter with adjustable opening according to claim 3, characterized in that: The limiting ring (12) is a cylindrical structure fixed on the inner wall of the catheter body (1), and a cavity for the guide wire (3) to pass through is provided in the middle of the limiting ring (12).

5. The multi-lumen suction catheter with adjustable opening according to claim 3, characterized in that: The limiting rings (12) are a plurality of circular rings arranged on the inner wall of the catheter body (1), and the circular rings are distributed at equal intervals.

6. The multi-lumen suction catheter with adjustable opening according to claim 1, characterized in that: The fixing component comprises a filling channel (4) provided on the catheter body (1), and a fixing balloon (5) provided on the catheter body (1), wherein the inner cavity formed by the fixing balloon (5) is in communication with the filling channel (4).

7. The multi-lumen suction catheter with adjustable opening according to claim 6, characterized in that: The distal end of the catheter body (1) is designed to be an oblique opening.

8. A multi-lumen suction catheter with adjustable opening according to any one of claims 1 to 7, characterized in that: A developing ring (6) is embedded in the distal end of the catheter body (1), and the developing ring (6) has the same outer diameter as the catheter body (1).

9. A multi-lumen suction catheter with adjustable opening according to any one of claims 1 to 7, characterized in that: The end of the guide wire (3) is provided with a developing point (32) formed by winding a nickel-titanium wire.

10. A multi-lumen suction catheter with adjustable opening according to any one of claim 9, characterized in that: The distal end of the developing point (32) is configured in an umbrella shape.

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