A neurointerventional catheter assembly

Abstract

This invention provides a neurointerventional catheter assembly, relating to the field of medical device technology, comprising a catheter body; a flexible tip at the distal end of the catheter body; a side hole on the sidewall of the flexible tip; a guide portion on the flexible tip; a through hole in the middle of the flexible tip; and a control guidewire passing through the middle of the catheter body, the control guidewire having a protrusion with a diameter larger than the through hole diameter. This invention features a flexible tip with a side hole located next to the through hole, allowing the side hole to be directly aligned with a branch vessel. The flexible tip guides a stent catheter, which then passes through the side hole, enabling the stent catheter to directly enter the branch vessel. This reduces the difficulty of stent catheter placement, thereby reducing surgical complexity and improving treatment outcomes.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a neurointerventional catheter assembly. Background Technology

[0002] In recent years, interventional surgery has become the mainstream method for treating vascular diseases due to its advantages such as minimal invasiveness, fewer complications, and rapid postoperative recovery. During the procedure, catheters are often used to guide and support instruments such as stents, facilitating their delivery to the target location.

[0003] Existing medical catheters typically have a flat distal end. When stents, stents, and balloons extend through the catheter body, they follow the direction of the catheter itself. However, in special cases, such as branch vessels forming an angle with the main vessel, or aneurysms near the bifurcation of the branch vessel, the stent portion needs to be placed at the neck of the aneurysm. Current techniques often involve bending or shaping the tip of a microguidewire to guide the stent catheter into the branch vessel. However, the large angle between the branch and the main vessel makes it difficult to insert the microguidewire tip into the branch vessel, increasing the surgical complexity and increasing the risk of vessel damage or rupture due to improper operation, resulting in high surgical risks and unsatisfactory outcomes.

[0004] Therefore, an improved technical solution is needed to address the problem of stent deployment difficulties caused by the above-mentioned circumstances. Summary of the Invention

[0005] The purpose of this invention is to provide a neurointerventional catheter assembly. By setting a flexible tip with a side hole next to the through hole, the side hole can be directly aligned with the branch vessel. The stent catheter is guided through the flexible tip and can be directly inserted into the branch vessel. This solves the problem that the angle between the branch vessel and the main vessel is large, which makes it difficult for the tip of the microguidewire to enter the branch vessel, resulting in high surgical difficulty and high surgical risk.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A neurointerventional catheter assembly includes a catheter body;

[0008] The distal end of the catheter body is provided with a flexible tip;

[0009] The flexible head end has a side hole on its side wall;

[0010] A guide section is provided on the flexible head end;

[0011] The flexible tip has a through hole in the middle, and a control guide wire passes through the middle of the catheter body. The control guide wire has a protrusion with a diameter larger than that of the through hole.

[0012] Preferably, when the control guidewire retracts, it causes the flexible tip to deform and retract into the catheter body.

[0013] Preferably, it also includes a stent catheter that passes through the catheter body and exits through the side hole.

[0014] Preferably, at least two side holes are provided, and the side holes are arranged in a ring at equal intervals on the flexible head end.

[0015] Preferably, the catheter body is provided with a radiopaque ring, and a distance of 2-3 mm is provided between the radiopaque ring and the flexible tip.

[0016] Preferably, the catheter body has a three-layer structure, and the flexible tip is bonded to the outer layer of the catheter body.

[0017] Preferably, the flexible tip is made of a flexible polymer material, such as polyurethane, polyethylene, polytetrafluoroethylene, or medical silicone.

[0018] Preferably, the protrusion is disposed on the control guidewire, and the edge of the protrusion is chamfered.

[0019] Beneficial effects:

[0020] (1) By setting a flexible tip with a side hole next to the through hole, the present invention allows the stent catheter to be directly aligned with the branch blood vessel. The stent catheter is guided through the flexible tip and passes through the side hole, thus allowing the stent catheter to directly enter the branch blood vessel, reducing the difficulty of stent catheter placement, thereby reducing the difficulty of surgery and improving the treatment effect.

[0021] (2) By setting up a control guidewire, a protrusion and a flexible tip, the present invention allows the flexible tip to deform and fold back into the catheter body when the control guidewire is retracted during withdrawal. This reduces the interference between the flexible tip and the end of the vascular stent during the withdrawal of the catheter body, reduces the possibility of displacement of the vascular stent during the withdrawal of the catheter body, and facilitates the withdrawal of the catheter body. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of the interventional surgical catheter of the present invention;

[0024] Figure 2 This is a cross-sectional structural diagram illustrating the internal structure of the flexible tip of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the interventional surgical catheter of the present invention after the flexible tip is incorporated into the catheter body;

[0026] Figure 4 This is a schematic diagram of the application of the interventional surgical catheter of the present invention to a hemangioma at a vascular bifurcation.

[0027] Figure 5 This is a schematic diagram of the endovascular stent of the present invention in a partially deployed state.

[0028] Figure 6 This is a schematic diagram of the stent catheter after withdrawal according to the present invention;

[0029] Figure 7 This is a schematic diagram showing the flexible tip being retracted into the catheter body during the use of this invention;

[0030] Figure 8 This is a schematic diagram of the catheter body after it has been retracted.

[0031] In the figure: 1. Catheter body; 2. Flexible tip; 21. Side hole; 22. Through hole; 23. Guide part; 3. Control guidewire; 31. Protrusion; 4. Imaging ring; 5. Stent catheter. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. 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 or an electrical connection or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components, an indirect connection, or an interaction between two components.

[0037] In the description of this invention, "distal" refers to the end that is farther from the doctor during surgery, and "proximal" refers to the end that is closer to the doctor during surgery.

[0038] In the description of this invention, "before use" refers to the state before the neurointerventional catheter assembly is used, before it enters the human body, or before it comes into contact with bodily fluids such as blood and tissue fluid in the human body, while "during use" refers to the state after the neurointerventional catheter assembly has entered the human body or come into contact with bodily fluids such as blood and tissue fluid in the human body.

[0039] In the description of this invention, "internal environment" refers to the environment below the epidermis of the skin where body fluids are present, such as the dermis and subcutaneous tissue, or the interior of blood vessels and organs.

[0040] The present invention will now be described in detail with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0041] This invention addresses the problem that when an aneurysm is located near the bifurcation of a branch vessel, after the endovascular stent is deployed, a portion of the proximal end of the stent remains at the bifurcation. During retrieval, interference can easily occur between the flexible tip of the main catheter and the tail end of the endovascular stent, potentially leading to stent displacement and difficulty in retrieving the flexible tip of the main catheter.

[0042] This invention provides a neurointerventional catheter assembly, as described above. Figures 1 to 4 It includes the catheter body 1;

[0043] A flexible tip 2 is provided at the distal end of the catheter body 1;

[0044] A side hole 21 is provided on the side wall of the flexible head end 2, through which the stent conduit 5 passes;

[0045] The flexible head end 2 is provided with a guide part 23 for guiding the stent conduit 5 into the side hole 21.

[0046] The catheter body 1 is a tubular component with a channel extending through it along its axial direction. The flexible tip 2 is a soft component made of a flexible polymer with low hardness, capable of deformation under stress. When not subjected to external force, the flexible tip 2 is cone-shaped.

[0047] The guide part 23 is integrally formed inside the flexible head end 2 and is located inside the side hole 21. The guide part 23 is inclined towards the side hole 21. After the stent conduit 5 enters the flexible head end 2, the stent conduit 5 contacts the guide part 23 and passes through the side hole 21 under the guidance of the guide part 23, thus realizing the positioning of the stent conduit 5.

[0048] A through hole 22 is provided in the middle of the flexible tip 2, and a control guide wire 3 is passed through the middle of the catheter body 1. The control guide wire 3 is provided with a protrusion 31 with a diameter larger than that of the through hole 22.

[0049] Furthermore, the middle part of the catheter body 1 refers to the channel that runs through it along its own axis.

[0050] The side hole 21 is located on the side wall of the flexible tip 2 and is directly aligned with the branch vessel. The side hole 21 is used for the passage of therapeutic instruments, such as stent catheters 5.

[0051] The through hole 22 of the flexible tip 2 allows the control guide wire 3 to pass through. The control guide wire 3 has an integrally formed protrusion 31. The diameter of the protrusion 31 is larger than the maximum diameter of the through hole 22, so that when the control guide wire 3 is retracted, the protrusion 31 is stuck at the through hole 22. The flexible tip 2 is relatively soft, and the protrusion 31 causes the flexible tip 2 to deform proximally, allowing the flexible tip 2 to be retracted into the catheter body 1.

[0052] When a treatment device reaches the distal end of the catheter body 1, two scenarios can occur: First, the treatment device passes directly through the side hole 21. In this case, since the side hole 21 is directly opposite the branch vessel, the treatment device is directly in place. Second, the treatment device reaches the distal end of the flexible tip 2, is guided by the guide part 23, passes through the side hole 21, enters the branch vessel, and thus achieves the placement of the treatment device.

[0053] Reference Figures 4 to 7 When in use, the distal end of the catheter body 1 is placed at the distal end of the blood vessel bifurcation, and the stent catheter 5 passes through the side hole 21. At this time, there is a certain angle between the stent catheter 5 and the catheter body 1, which can be easily entered into the branch blood vessel. After the stent catheter 5 is in place, the intravascular stent is released, thereby performing the treatment of the aneurysm.

[0054] Reference Figures 4 to 8Furthermore, after the endovascular stent is deployed, because the aneurysm is relatively close to the bifurcation, part of the endovascular stent may remain at the neck of the aneurysm after the stent catheter 5 is withdrawn. The tail of the endovascular stent may support or press against the side hole 21. At this time, when the main body of the catheter 1 is withdrawn, the flexible tip 2 will pull or squeeze the tail of the endovascular stent, which will put great pressure on the contact point between the tail of the stent and the side hole 21. This may lead to the risk of displacement of the endovascular stent or damage or breakage of the flexible tip of the main catheter, resulting in serious surgical accidents.

[0055] In a preferred embodiment of the present invention, the catheter body 1 adopts a three-layer structure, and the flexible tip 2 is connected to the outer layer of the catheter body 1 by adhesive bonding.

[0056] In a preferred embodiment of the present invention, the flexible head end 2 is conical. The conical head end can improve maneuverability and make it easier for the flexible head end 2 to be positioned.

[0057] In a preferred embodiment of the present invention, at least two side holes 21 are provided, and they are arranged in a ring at equal intervals on the flexible tip 2. By providing multiple side holes 21, the coverage area of ​​the side holes 21 is increased, while the difficulty of allowing the stent catheter 5 to pass through the side holes 21 is reduced, thereby reducing the difficulty of the operation.

[0058] In a preferred embodiment of the present invention, the protrusion 31 is integrally formed on the control guidewire 3, and the edge of the protrusion 31 is chamfered. The material of the protrusion 31 is the same as that of the control guidewire 3 to reduce the processing difficulty. The purpose of the chamfer on the protrusion 31 is to reduce the possibility of damage to the blood vessel wall caused by friction between the protrusion 31 and the blood vessel wall during the sliding of the control guidewire 3.

[0059] In other embodiments of this application, the protrusion 31 is welded to the control guide wire 3.

[0060] In a preferred embodiment of the present invention, the flexible tip 2 is made of a flexible polymer material, such as polyurethane, polyethylene, polytetrafluoroethylene, or medical silicone.

[0061] In a preferred embodiment of the present invention, the control guidewire 3 is a component made of nickel-titanium alloy. The nickel-titanium alloy control guidewire 3 has a certain imaging function, which can assist the doctor in determining the position of the control guidewire 3. The control guidewire 3 is used to control the retrieval of the flexible tip 2.

[0062] In a preferred embodiment of the present invention, the catheter body 1 is a tubular component made of polytetrafluoroethylene (PTFE), polyurethane (PU), or nylon. The catheter body 1 is made of a material that has minimal impact on the intravascular environment.

[0063] In a preferred embodiment of the present invention, a contrast-enhancing ring 4 is provided on the catheter body 1, and a distance of 2-3 mm is provided between the contrast-enhancing ring 4 and the flexible tip 2. By providing the contrast-enhancing ring 4, the position of the tip of the catheter body 1 can be determined under contrast-enhancing equipment, thereby assisting the doctor in operation.

[0064] The following detailed description of a neurointerventional catheter assembly of the present invention is provided through specific embodiments.

[0065] Example 1

[0066] This embodiment provides a neurointerventional catheter assembly, as shown in the reference... Figures 1 to 4 The catheter body 1 includes a flexible tip 2 bonded to the distal end of the catheter body 1. A through hole 22 is provided in the middle of the flexible tip 2. A channel is provided on the catheter body 1. A control guide wire 3 passes through the channel. A protrusion 31 with a diameter larger than the diameter of the through hole 22 is integrally formed on the control guide wire 3.

[0067] The flexible tip 2 is made of a flexible polymer material, such as medical silicone.

[0068] The flexible tip 2 has a side hole 21 located next to the through hole 22. The side hole 21 is used to guide the stent catheter 5. There are three side holes 21, which are distributed in a ring at equal intervals on the side wall of the flexible tip 2. The multiple side holes 21 reduce the difficulty of allowing the stent catheter 5 to pass through the side holes 21, thereby reducing the difficulty of the operation.

[0069] The guide part 23 is integrally formed inside the flexible tip 2 and is located inside the side hole 21. The guide part 23 is inclined towards the side hole 21. After the stent catheter 5 enters the flexible tip 2, the stent catheter 5 contacts the guide part 23 and passes through the side hole 21 under the guidance of the guide part 23, thereby realizing the positioning of the stent catheter 5, reducing the difficulty of positioning the stent catheter 5, thereby reducing the difficulty of the operation and reducing the risk of the operation.

[0070] Reference Figures 4 to 8 When in use, the distal end of the catheter body 1 is crossed over the blood vessel bifurcation and positioned at the distal end of the blood vessel bifurcation. The stent catheter 5 passes through the side hole 21. At this time, there is a certain angle between the stent catheter 5 and the catheter body 1, which can be conveniently inserted into the branch blood vessel. The stent catheter 5 is used to place an intravascular stent, thereby implementing the treatment of aneurysm.

[0071] Furthermore, at the aneurysm orifice, the stent's tail may block or compress the side hole 21. In this situation, during catheter body 1 retraction, the flexible tip 2 may pull or squeeze the stent's tail, applying significant pressure to the contact point between the stent tail and the side hole 21. This could lead to stent displacement or damage or breakage of the flexible tip of the catheter body, resulting in serious surgical accidents. To address these issues, a flexible tip 2 is designed. During retraction, the retraction control guidewire 3 causes the flexible tip 2 to deform and fold back under pressure. After deformation, the flexible tip 2 retracts into the catheter body 1, reducing interference with the stent during retraction and lowering the likelihood of stent displacement.

[0072] The protrusion 31 is integrally formed on the control guidewire 3, and the edge of the protrusion 31 is chamfered. The material of the protrusion 31 is the same as that of the control guidewire 3 to reduce the difficulty of processing. The purpose of the chamfer on the protrusion 31 is to reduce the possibility of damage to the blood vessel wall caused by friction between the protrusion 31 and the blood vessel wall during the sliding of the control guidewire 3.

[0073] A contrast-enhancing ring 4 is attached to the catheter body 1, with a 2-3 mm gap between the contrast-enhancing ring 4 and the flexible tip 2. The contrast-enhancing ring 4 helps determine the position of the catheter tip 1 under contrast imaging, thus assisting the doctor's operation.

[0074] In summary, this invention provides a side hole 21 at the flexible tip 2, allowing the distal end of the catheter body 1 to be placed at the distal end of the vascular bifurcation. The stent catheter 5 passes through the side hole 21, which is aligned with the branch vessel, enabling the stent catheter 5 to easily enter the branch vessel. The stent catheter 5 is used to place an intravascular stent, resulting in a high placement rate, reduced release difficulty, and improved surgical outcomes.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A neurointerventional catheter assembly, comprising: The utility model relates to a kind of catheter, including catheter body (1); The distal end of the catheter body (1) is provided with a flexible tip (2); A side hole (21) is provided on the side wall of the flexible tip (2); A guide portion (23) is provided on the flexible tip (2); A through hole (22) is formed in the middle of the flexible tip (2), a control guide wire (3) is provided in the middle of the catheter body (1), and a protruding portion (31) with a diameter larger than that of the through hole (22) is provided on the control guide wire (3); When the control guide wire (3) is withdrawn, the protruding portion (31) deforms the flexible tip (2) and retracts into the catheter body (1).

2. The neurointerventional catheter assembly of claim 1, wherein, It also includes a stent catheter (5) that passes through the catheter body (1) and exits from the side hole (21).

3. The neurointerventional catheter assembly of claim 1, wherein, The side hole (21) is provided with at least two, and the side hole (21) is arranged on the flexible tip (2) in a ring shape at equal intervals.

4. The neurointerventional catheter assembly of claim 1, wherein, The catheter body (1) is provided with a developing ring (4), and a space of 2-3 mm is provided between the developing ring (4) and the flexible tip (2).

5. The neurointerventional catheter assembly of claim 1, wherein, The catheter body (1) adopts a three-layer structure, and the flexible tip (2) is connected to the outer layer of the catheter body (1) by adhesion.

6. A neurointerventional catheter assembly according to any of claims 1-5, wherein, The flexible tip (2) is made of a flexible polymer material.

7. A neurointerventional catheter assembly according to claim 6, wherein, The flexible polymer material is one of polyurethane, polyethylene, polytetrafluoroethylene and medical silicone.

8. A neurointerventional catheter assembly according to any one of claims 1-5, wherein, The edge of the protruding portion (31) is provided with a chamfer.

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