Nerve intervention catheter assembly

Abstract

The invention provides a nerve intervention catheter assembly, and relates to the technical field of medical instruments. A flexible head end is arranged at the far end of the catheter main body; a side hole is formed in the side wall of the flexible head end; a guide part is arranged on the flexible head end; a through hole is formed in the middle of the flexible head end, a control guide wire is arranged in the middle of the catheter body in a penetrating mode, and a protruding part with the diameter larger than that of the through hole is arranged on the control guide wire. The flexible head end is arranged, the side hole located beside the through hole is formed in the flexible head end, the side hole is directly aligned with the branch blood vessel, the stent catheter is guided through the flexible head end, the stent catheter penetrates out of the side hole, the stent catheter directly enters the branch blood vessel, the in-place difficulty of the stent catheter is lowered, the operation difficulty is lowered, and the treatment effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a neurointerventional catheter assembly. Background Art

[0002] In recent years, due to the characteristics of minimally invasive surgery, fewer complications, and rapid postoperative recovery, interventional surgery has become the mainstream method for treating vascular diseases. During the operation, a catheter is often used to provide path guidance and support for instruments such as a stent catheter, so as to facilitate the delivery of the instrument to the target position.

[0003] The distal end of the existing medical catheter body has a flat mouth design. When instruments such as a stent catheter, a stent, and a balloon extend through the catheter body, they also follow the direction of the catheter body. In the face of some special situations, such as a branch vessel forming a certain angle with the main vessel, and there is an aneurysm near the bifurcation of the branch vessel. At this time, it is necessary to place part of the vascular stent at the aneurysm neck. In the existing technology, usually, the tip of the micro-guide wire is bent or shaped, so that after the tip of the micro-guide wire enters the branch vessel, it guides the stent catheter into the branch vessel. However, due to the large angle between the branch vessel and the main vessel, it is difficult for the tip of the micro-guide wire to enter the branch vessel, increasing the surgical difficulty, and it is easy to cause scratches or even rupture of the patient's blood vessel due to improper operation, with high surgical risk and unsatisfactory results.

[0004] Therefore, in view of the problem of difficult stent release caused by the above situation, an improved technical solution is needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a neurointerventional catheter assembly. By setting a flexible tip, and side holes are arranged beside the through hole on the flexible tip, so that the side holes directly face the branch vessel, and the stent catheter is guided by the flexible tip, so that the stent catheter directly enters the branch vessel, to solve the problems that due to the large angle between the branch vessel and the main vessel, it is difficult for the tip of the micro-guide wire to enter the branch vessel, resulting in high surgical difficulty and high surgical risk.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A neurointerventional catheter assembly, comprising a catheter body;

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

[0009] The side wall of the flexible tip is provided with side holes;

[0010] The flexible tip is provided with a guiding portion;

[0011] A through hole is provided in the middle of the flexible head end, a control guide wire is inserted through the middle of the catheter body, and a protruding portion with a diameter larger than the diameter of the through hole is provided on the control guide wire.

[0012] Preferably, when the control guide wire is retracted, it drives the flexible head end to deform and retract into the catheter body.

[0013] Preferably, it further includes a stent catheter, and the stent catheter 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 an annular and equally spaced manner on the flexible head end.

[0015] Preferably, a radiopaque ring is provided on the catheter body, and a spacing of 2-3 mm is provided between the radiopaque ring and the flexible head end.

[0016] Preferably, the catheter body adopts a three-layer structure, and the flexible head end is connected to the outer layer of the catheter body by an adhesive method.

[0017] Preferably, the flexible head end is made of a flexible polymer material, such as one of polyurethane, polyethylene, polytetrafluoroethylene, and medical silicone.

[0018] Preferably, the protruding portion is provided on the control guide wire, and a chamfer is provided at the edge of the protruding portion.

[0019] Beneficial effects:

[0020] (1) By providing a flexible head end in the present invention, with side holes located beside the through hole on the flexible head end, the side holes are directly aligned with the branch blood vessels. By guiding the stent catheter through the flexible head end, the stent catheter exits through the side hole, enabling the stent catheter to directly enter the branch blood vessels, reducing the difficulty of the stent catheter reaching the position, thereby reducing the surgical difficulty and improving the treatment effect;

[0021] (2) By providing a control guide wire, a protruding portion and a flexible head end in the present invention, when retracting, retracting the control guide wire causes the flexible head end to be deformed and folded back into the catheter body under pressure, reducing the interference between the flexible head end and the tail end of the intravascular stent during the process of retracting the catheter body, reducing the possibility of the intravascular stent displacement when retracting the catheter body, and facilitating the retraction of the catheter body. Brief Description of the Drawings

[0022] The schematic diagrams in the specification that form a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

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

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

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

[0026] Figure 4 This is a schematic diagram of the interventional catheter of the present invention when applied to a hemangioma at a vascular bifurcation;

[0027] Figure 5 This is a schematic diagram of the intravascular stent of the present invention in a partially released state;

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

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

[0030] Figure 8 This is a schematic diagram after the catheter body of the present invention is withdrawn.

[0031] In the figure: 1. Catheter body; 2. Flexible tip; 21. Side hole; 22. Through hole; 23. Guide portion; 3. Control guide wire; 31. Protruding portion; 4. Marking ring; 5. Stent catheter. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present invention.

[0034] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the original number, above, below, within, etc. are understood as including the original number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0035] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "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 specified and limited, the term "connection" should be understood in a broad sense. For example, it may be a fixed connection or a movable connection, or a detachable connection or a non-detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection or a connection that can communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two components, indirect communication or the interaction relationship between two components.

[0037] In the description of the present invention, "distal end" refers to the end farther from the doctor during the operation, and "proximal end" refers to the end closer to the doctor during the operation.

[0038] In the description of the present invention, "before use" refers to the state before the neurointerventional catheter assembly is not used, not inserted into the human body, or not in contact with body fluids such as blood and tissue fluid in the human body. "During use" refers to the state where the neurointerventional catheter assembly has been inserted into the human body or is in contact with body fluids such as blood and tissue fluid 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 inside blood vessels and organs.

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

[0041] In the present invention, for an aneurysm located at a position close to the bifurcation of a branch vessel, after the intravascular stent is released, a part of the proximal end of the intravascular stent still remains at the bifurcation. During the recovery process, interference is likely to occur between the flexible head end of the main catheter and the tail end of the intravascular stent, which may cause displacement of the intravascular stent and difficulty in withdrawing the flexible head end of the main catheter.

[0042] The present invention provides a neurointerventional catheter assembly, referring to Figures 1 to 4 , including a catheter body 1;

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

[0044] Side holes 21 are provided on the side wall of the flexible head end 2, and the side holes 21 are for a stent catheter 5 to pass through;

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

[0046] The catheter body 1 is a tubular member, and a channel axially penetrating through itself is formed in the catheter body 1. The flexible head end 2 is a soft member made of a flexible polymer, with a low hardness and being deformable under force. When the flexible head end 2 is not under external force, it is in a conical shape.

[0047] The guiding portion 23 is integrally formed inside the flexible head end 2, located inside the side hole 21. The guiding portion 23 is inclined towards the side hole 21. After the stent catheter 5 enters the flexible head end 2, the stent catheter 5 contacts the guiding portion 23 and is guided by the guiding portion 23 to pass through the side hole 21, realizing the positioning of the stent catheter 5.

[0048] A through hole 22 is formed in the middle of the flexible head end 2, and a control guide wire 3 is passed through the middle of the catheter body 1. A protruding portion 31 with a diameter larger than the diameter of the through hole 22 is provided on the control guide wire 3;

[0049] Furthermore, the middle part of the catheter body 1 refers to the channel axially penetrating through itself.

[0050] The side hole 21 is located on the side wall of the flexible head end 2, directly facing the branch blood vessel. The side hole 21 is used for allowing treatment instruments, such as the stent catheter 5, to pass through.

[0051] The through hole 22 of the flexible head end 2 allows the control guide wire 3 to pass through. The protruding portion 31 is integrally formed on the control guide wire 3, and the diameter of the protruding portion 31 is larger than the maximum diameter of the through hole 22. When the control guide wire 3 is retracted, the protruding portion 31 is stuck at the through hole 22. Since the flexible head end 2 is relatively soft, the protruding portion 31 drives the flexible head end 2 to generate deformation towards the proximal end, and the flexible head end 2 is received into the catheter body 1.

[0052] When a treatment instrument reaches the distal end of the catheter body 1, the following two situations will occur: First, the treatment instrument directly passes through the side hole 21 and exits. At this time, since the side hole 21 is directly opposite the branch blood vessel, the treatment instrument is directly positioned. Second, the treatment instrument reaches the most distal end of the flexible head end 2, is guided by the guiding portion 23 and then passes through the side hole 21 and enters the branch blood vessel, realizing the positioning of the treatment instrument.

[0053] Refer to 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. 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 conveniently enter the branch blood vessel. After the stent catheter 5 is positioned, the intravascular stent is released, thereby implementing the treatment of the aneurysm.

[0054] Refer to Figures 4 to 8, Further, after releasing the endovascular stent, since the aneurysm is relatively close to the bifurcation, after the stent catheter 5 is withdrawn, part of the endovascular stent still remains at the aneurysm neck opening, and the tail of the endovascular stent may support or press on the side hole 21. At this time, when the catheter body 1 is withdrawn, the flexible tip 2 will pull or squeeze the tail end of the endovascular stent, and will exert a large pressure on the position where the tail of the stent contacts the side hole 21, which may cause 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 has a three-layer structure, and the flexible tip 2 is connected to the outer layer of the catheter body 1 by an adhesive method.

[0056] In a preferred embodiment of the present invention, the flexible tip 2 is conical. The tip of the cone can improve the passing ability and make the flexible tip 2 easier to reach the position.

[0057] In a preferred embodiment of the present invention, at least two side holes 21 are provided and are arranged at equal intervals in a ring on the flexible tip 2. By providing a plurality of side holes 21, the coverage area of the side holes 21 is increased, and at the same time, the difficulty of passing the stent catheter 5 through the side holes 21 is reduced, thereby reducing the surgical difficulty.

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

[0059] In other embodiments of the present application, the protruding portion 31 is welded to the control wire 3.

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

[0061] In a preferred embodiment of the present invention, the control wire 3 is a component made of nitinol. The nitinol control wire 3 has a certain imaging function, which can assist the doctor in judging the position of the control wire 3. The control wire 3 is used to control the recovery of the flexible tip 2.

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

[0063] In a preferred embodiment of the present invention, a radiopaque ring 4 is provided on the catheter body 1, and a spacing of 2-3 mm is provided between the radiopaque ring 4 and the flexible distal end 2. By providing the radiopaque ring 4, the position of the distal end of the catheter body 1 can be assisted in being judged under a radiological device to assist the doctor in operation.

[0064] The following specifically describes a neurointerventional catheter assembly of the present invention through specific embodiments.

[0065] Embodiment 1

[0066] This embodiment provides a neurointerventional catheter assembly. Refer to Figures 1 to 4 , including a catheter body 1. A flexible distal end 2 is adhesively bonded to the distal end of the catheter body 1. A through hole 22 is provided in the middle of the flexible distal end 2. A channel is provided on the catheter body 1, and a control guide wire 3 is passed through the channel. A protruding portion 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 distal end 2 is made of a flexible polymer material, such as medical silicone.

[0068] Side holes 21 are provided on the flexible distal end 2 beside the through hole 22. The side holes 21 are used to guide a stent catheter 5. There are three side holes 21, which are distributed at equal intervals in a ring on the side wall of the flexible distal end 2. By providing a plurality of side holes 21, the difficulty of allowing the stent catheter 5 to pass through the side holes 21 is reduced, and the surgical difficulty is thus reduced.

[0069] A guiding portion 23 is integrally formed inside the flexible distal end 2, located inside the side holes 21. The guiding portion 23 is inclined towards the side holes 21. After the stent catheter 5 enters the flexible distal end 2, the stent catheter 5 contacts the guiding portion 23 and passes through the side holes 21 under the guidance of the guiding portion 23, realizing the positioning of the stent catheter 5, reducing the positioning difficulty of the stent catheter 5, thereby reducing the surgical difficulty and at the same time reducing the surgical risk.

[0070] Refer to Figures 4 to 8 , during use, the distal end of the catheter body 1 is passed across a vascular bifurcation and located distal to the vascular bifurcation. The stent catheter 5 passes through the side holes 21. At this time, there is a certain angle between the stent catheter 5 and the catheter body 1, and it can conveniently enter the branch blood vessel. The stent catheter 5 is used to place an intravascular stent, thereby implementing the treatment of an aneurysm.

[0071] Furthermore, at the aneurysm orifice, the tail of the endovascular stent may support or press against the side hole 21. At this time, when withdrawing the catheter body 1, the flexible tip 2 will pull or squeeze the tail end of the endovascular stent, exerting a large pressure on the position where the tail of the stent contacts the side hole 21, which 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. To address the above problems, the flexible tip 2 is provided. When withdrawing, the control guide wire 3 is retracted to cause the flexible tip 2 to deform and fold back under pressure. After deformation, the flexible tip 2 is withdrawn into the catheter body 1, reducing the interference with the endovascular stent during the process of withdrawing the catheter body 1 and reducing the possibility of displacement of the endovascular stent.

[0072] The protrusion 31 is integrally formed on the control guide wire 3, and a chamfer is provided at the edge of the protrusion 31. The material of the protrusion 31 is the same as that of the control guide wire 3, which is used to reduce the processing difficulty. The purpose of providing 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 guide wire 3.

[0073] A radiopaque ring 4 is bonded to the catheter body 1, and a spacing of 2 - 3 mm is provided between the radiopaque ring 4 and the flexible tip 2. By providing the radiopaque ring 4, the position of the tip of the catheter body 1 can be assisted in being judged under a radiological device to assist the doctor in operation.

[0074] In summary: By providing the side hole 21 at the flexible tip 2 of the present invention, the distal end of the catheter body 1 is placed at the distal end of the blood vessel bifurcation. The stent catheter 5 passes through the side hole 21, and the side hole 21 is aligned with the branch blood vessel, enabling the stent catheter 5 to conveniently enter the branch blood vessel. The stent catheter 5 is used to place the endovascular stent, and the stent catheter 5 has a high positioning rate and the release difficulty is reduced, improving the surgical effect.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A neurointerventional catheter assembly, characterized in that, Comprising a catheter body (1); A flexible distal end (2) is provided at the distal end of the catheter body (1); Side holes (21) are provided on the side wall of the flexible distal end (2); A guiding portion (23) is provided on the flexible distal end (2); A through hole (22) is formed in the middle of the flexible distal end (2), a control guide wire (3) is passed through the middle of the catheter body (1), and a protruding portion (31) with a diameter larger than the diameter of the through hole (22) is provided on the control guide wire (3).

2. The neurointerventional catheter assembly according to claim 1, wherein, When the control guide wire (3) is retracted, it drives the flexible distal end (2) to deform and retract into the catheter body (1).

3. The neurointerventional catheter assembly according to claim 1, wherein Also included is a stent catheter (5), and the stent catheter (5) passes through the catheter body (1) and exits from the side hole (21).

4. A neurointerventional catheter assembly according to claim 1, wherein There are at least two side holes (21), and the side holes (21) are arranged in an annular and equally spaced manner on the flexible distal end (2).

5. A neurointerventional catheter assembly according to claim 1, wherein A radiopaque ring (4) is provided on the catheter body (1), and a spacing of 2 - 3 mm is provided between the radiopaque ring (4) and the flexible distal end (2).

6. The neurointerventional catheter assembly according to claim 1, wherein The catheter body (1) adopts a three-layer structure, and the flexible distal end (2) is connected to the outer layer of the catheter body (1) by an adhesive method.

7. A neurointerventional catheter assembly according to any one of claims 1-6, characterized in that, The flexible distal end (2) is made of a flexible polymer material, such as one of polyurethane, polyethylene, polytetrafluoroethylene, and medical silicone.

8. A neurointerventional catheter assembly according to any one of claims 1-6, characterized in that, The protruding portion (31) is provided on the control guide wire (3), and a chamfer is provided at the edge of the protruding portion (31).

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