Guiding and extending catheter system

Abstract

The utility model relates to the technical field of medical instruments, in particular to a guiding and extending catheter system which comprises a guiding catheter and a guiding device. The guide extension catheter is arranged in an inner cavity of the guide catheter, the guide extension catheter extends in the length direction of the guide catheter, a first drawing push rod is arranged at the tail of the guide extension catheter, and the first drawing push rod extends out of the guide catheter; the outer diameter of the auxiliary catheter is smaller than the inner diameter of the guide extension catheter, a receding groove is formed in one side of the auxiliary catheter and is suitable for being in sliding clamping fit with the first drawing push rod in the length direction, and the auxiliary catheter is suitable for extending to the front end of the head of the guide extension catheter in the length direction of an inner cavity of the guide extension catheter. The receding groove and the first drawing push rod are arranged to slide in a matched mode, so that the outer diameter of the auxiliary catheter is increased, when the auxiliary catheter extends to the head of the guide extension catheter, the auxiliary catheter and the guide extension catheter can be tightly matched, and it is guaranteed that the guide extension catheter can be driven by the auxiliary catheter to smoothly move everywhere in the blood vessel to rapidly reach the thrombectomy position.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a guide extension catheter system. Background Art

[0002] Guide extension catheters are often used as auxiliary catheters for complex coronary interventional treatments, providing additional support and pathways for interventional treatments. They can deliver instruments to target lesions quickly, efficiently, and safely, thereby improving the success rate of the operation.

[0003] During surgery, the guide extension catheter passes through the inner lumen of the guide catheter, protrudes from the distal end of the guide catheter, and extends toward the distal end of the blood vessel. The guide extension catheter is moved within the vessel by pushing the guide wire at the end of the catheter. During this process, when passing through a tortuous vessel, the distal opening of the guide extension catheter can easily become stuck on the vessel wall, preventing further advancement. This poses additional risks to the operator during the procedure.

[0004] To solve the problem of the distal opening of the extension catheter getting stuck in tortuous blood vessels, patent CN219398628U provides a rapidly exchangeable catheter system, including a guide extension catheter and an auxiliary catheter for use together. The distal end of the guide extension catheter adopts a variable diameter design, that is, the distal outer diameter of the guide extension catheter body is smaller than the proximal outer diameter, the proximal end of the tube body is provided with a guide wire exchange opening, and the distal end of the auxiliary catheter body is provided with a guide portion. The guide portion can drive the guide extension catheter to extend toward the distal end of the blood vessel, preventing the distal opening of the guide extension catheter from getting stuck in the blood vessel wall, and ensuring the smooth progress of the operation. This design is mainly suitable for guide extension catheters with variable distal diameters. Currently, PCI surgery still mainly uses full-diameter guide extension catheters because their large inner lumen has better instrument delivery capabilities and stronger distal support. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the guide extension catheter may get stuck and be unable to advance in a tortuous blood vessel, thereby providing a guide extension catheter system.

[0006] In order to solve the above technical problems, the present invention provides a guide extension catheter system, comprising:

[0007] guide catheter;

[0008] The guide extension catheter is disposed in the inner cavity of the guide catheter. The guide extension catheter is a through-diameter tube that extends along the length of the guide catheter. A first pull-out push rod is provided at the tail end of the guide extension catheter, and the first pull-out push rod extends outside the guide catheter.

[0009] The auxiliary catheter has an outer diameter smaller than the inner diameter of the guide extension catheter. A clearance groove is provided on one side of the auxiliary catheter. The clearance groove is suitable for sliding and engaging with the first pull-out push rod along the length direction. The auxiliary catheter is suitable for extending along the length direction of the inner cavity of the guide extension catheter to the front end of the guide extension catheter head.

[0010] Optionally, a guide piece is provided at the head of the auxiliary catheter, and an end of the guide piece away from the auxiliary catheter is in an arc shape that is axially convex outward.

[0011] Optionally, the head of the guide is circular or oval.

[0012] Optionally, the guide member extends in a tapered shape in the length direction, and an end of the guide member with a larger outer diameter is connected to the body of the auxiliary catheter.

[0013] Optionally, a second pull-out push rod is provided at the tail end of the auxiliary catheter, and the second pull-out push rod extends outside the guide catheter.

[0014] Optionally, a guide exchange bevel is provided at the opening of the tail of the guide extension catheter.

[0015] Optionally, a communication side hole is provided on the side of the guide extension catheter, and the communication side hole is arranged close to the head of the guide extension catheter.

[0016] Optionally, an auxiliary bevel is provided at the opening of the tail of the auxiliary conduit.

[0017] Optionally, the outer surface of the guide extension catheter is coated with a hydrophilic coating.

[0018] Optionally, the head of the guide extension catheter is provided with a marking piece.

[0019] The technical solution of this utility model has the following advantages:

[0020] 1. The guide extension catheter system provided by the present invention comprises: a guide catheter; a guide extension catheter, which is arranged in the inner cavity of the guide catheter and extends along the length direction of the guide catheter, and a first pull-out push rod is provided at the tail end of the guide extension catheter, and the first pull-out push rod extends to the outside of the guide catheter; an auxiliary catheter, whose outer diameter is smaller than the inner diameter of the guide extension catheter, and a clearance groove is provided on one side of the auxiliary catheter, the clearance groove is suitable for sliding and engaging with the first pull-out push rod along the length direction, and the auxiliary catheter is suitable for extending along the length direction of the inner cavity of the guide extension catheter to the front end of the guide extension catheter head.

[0021] When using the guide extension catheter system for thrombus aspiration, the guide extension catheter adopts a full-diameter design. First, the guide catheter is extended along the blood vessel into the patient's body. Under guidance, the guide extension catheter smoothly enters the inner lumen of the guide catheter and is pushed to the target blood vessel position. The auxiliary catheter enters the interior of the guide catheter from the tail of the guide catheter, and the clearance groove is slidably matched with the first pull-out push rod at the tail of the guide extension catheter to push the auxiliary catheter forward. The auxiliary catheter enters the inner lumen of the guide extension catheter, extends from the front end of the guide extension catheter head, and contacts the blood vessel wall. Under the guidance of the auxiliary catheter, when the guide extension catheter is pushed forward again, the guide extension catheter can smoothly pass through the tortuous blood vessels, allowing the guide extension catheter to move forward smoothly, avoiding the distal opening of the guide extension catheter from getting stuck in the blood vessel wall. At the same time, a clearance groove is provided to slide in cooperation with the first pulling and pushing rod to increase the outer diameter of the auxiliary catheter, so that when the auxiliary catheter is extended to the head of the guide extension catheter, the two can fit tightly together, thereby preventing the guide extension catheter from getting stuck when passing through a tortuous blood vessel due to the loose fit between the auxiliary catheter and the guide extension catheter caused by the thin auxiliary catheter, and ensuring that the guide extension catheter can move smoothly throughout the blood vessel under the drive of the auxiliary catheter to quickly reach the thrombus aspiration position.

[0022] 2. The guide extension catheter system provided by the present invention features a guide member at the head of the auxiliary catheter. The end of the guide member, which is distal to the auxiliary catheter, is axially convex and arc-shaped. This guide member allows the convex head of the guide member to adhere to the vessel wall when the auxiliary catheter is in contact with the vessel wall, enhancing the contact between the auxiliary catheter and the vessel wall and ensuring smooth advancement of the guide extension catheter.

[0023] 3. The guide extension catheter system provided by the present invention has a connecting side hole provided on the side of the guide extension catheter. The connecting side hole is arranged close to the head of the guide extension catheter to prevent blood flow blockage during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of a guide extension catheter provided in an embodiment of the present utility model.

[0026] Figure 2 This is a schematic structural diagram of the auxiliary catheter provided in an embodiment of the present utility model.

[0027] Figure 3 It is a schematic cross-sectional view of the auxiliary catheter provided in an embodiment of the present utility model.

[0028] Figure 4 This is a schematic diagram of the guide extension catheter advancing within the guide tube in the guide extension catheter system provided in an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the auxiliary catheter advancing within the guide tube of the guide extension catheter system provided in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of an auxiliary catheter extending to the front end of the guide extension catheter in the guide extension catheter system provided in an embodiment of the present invention.

[0031] Figure 7 This is a cross-sectional schematic diagram of the cooperation between the auxiliary catheter, the guide wire and the first pulling push rod provided in an embodiment of the present utility model.

[0032] Explanation of the accompanying reference numerals: 1. Guide wire; 2. Guide catheter; 3. Guide extension catheter; 4. Auxiliary catheter; 5. First pull-out push rod; 6. Guide exchange bevel; 7. Connecting side hole; 8. Give way groove; 9. Second pull-out push rod; 10. Auxiliary bevel; 11. Guide member; 12. Marking member. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Figures 1 to 7 The figure shows a guide extension catheter system provided by this embodiment, which includes a guide catheter 2, a guide extension catheter 3 and an auxiliary catheter 4.

[0038] The guide extension catheter 3 is arranged in the inner cavity of the guide catheter 2, and the guide extension catheter 3 extends along the length direction of the guide catheter 2. Figure 1 As shown, the tail of the guide extension catheter 3 is provided with a first pull-out push rod 5, which extends outside the guide catheter 2. The tail of the guide extension catheter 3 is provided with a guide exchange bevel 6. The side of the guide extension catheter 3 is provided with a connecting side hole 7, which is arranged near the head of the guide extension catheter 3. The head of the guide extension catheter 3 is provided with a developing ring as a marking member 12. The developing ring can be a tantalum ring or a platinum-iridium ring, which can be developed under X-rays, facilitating the precise positioning of the guide catheter 2 in the human body during surgery.

[0039] The outer diameter of the auxiliary catheter 4 is smaller than the inner diameter of the guide extension catheter 3. Figure 2 As shown, a clearance groove 8 is provided on one side of the auxiliary catheter 4, and the clearance groove 8 is suitable for sliding and engaging with the first pulling and pushing rod 5 along the length direction. The auxiliary catheter 4 is suitable for extending along the length direction of the inner cavity of the guide extension catheter 3 to the front end of the head of the guide extension catheter 3. In this embodiment, there is one clearance groove 8. In some other embodiments, a plurality of clearance grooves 8 can be provided on the auxiliary catheter 4 at intervals along the circumferential direction, and the rod 5 can freely choose to cooperate with one of the clearance grooves 8. In order to increase the smoothness of the auxiliary catheter 4 when it is pushed along the guide extension catheter 3, the outer surface of the guide extension catheter 3 is coated with a hydrophilic coating, and the inside of the clearance groove 8 is coated with a hydrophilic coating. In some other embodiments, the inside of the clearance groove 8 is not coated with a hydrophilic coating.

[0040] A guide member 11 is provided at the head of the auxiliary catheter 4. The end of the guide member 11, facing away from the auxiliary catheter 4, is axially convex and arc-shaped. The head of the guide member 11 is circular or elliptical. The guide member 11 extends in a tapered shape along its length, with the end with the larger outer diameter of the guide member 11 connected to the main body of the auxiliary catheter 4. A second pull-out push rod 9 is provided at the rear end of the auxiliary catheter 4, extending outside the guide catheter 2. An auxiliary bevel 10 is provided at the opening of the rear end of the auxiliary catheter 4.

[0041] The guide extension catheter 3 adopts a full-diameter design, and the proximal end of the guide extension catheter 3 is provided with a guide exchange bevel 6 for rapid exchange of instruments such as the guide wire 1 and the auxiliary catheter 4. The opening at the tail of the guide extension catheter 3 is provided with a guide exchange bevel 6, and the guide extension catheter 3 and the first pull-out push rod 5 are connected as a whole through the guide exchange bevel 6. The head of the auxiliary catheter 4 is provided with a guide member 11, and the outer diameter of the auxiliary catheter 4 is adapted to the inner cavity diameter of the guide extension catheter 3. The auxiliary catheter 4 adopts a double-lumen design, wherein the inner cavity of the auxiliary catheter 4 is used to accommodate the guide wire 1, and the give way groove 8 is used to accommodate the first pull-out push rod 5.

[0042] In this embodiment, the guide exchange bevel 6 and auxiliary bevel 10 are both metal steel tubes, processed by laser cutting. The first pull-out push rod 5 and the second pull-out push rod 9 are made of stainless steel or nickel-titanium, which have excellent mechanical properties and good pushability. The guide extension catheter 3, the guide exchange bevel 6, and the first pull-out push rod 5, as well as the auxiliary catheter 4, the auxiliary bevel 10, and the second pull-out push rod 9, are assembled by laser welding or brazing, resulting in high-strength connections.

[0043] In this embodiment, the guide catheter 2 is formed by a composite of multiple layers of materials, including a three-layer structure of an inner layer, an intermediate layer, and an outer layer. The inner and outer layers are composed of high molecular polymers, wherein the inner layer material is selected from low-resistance polytetrafluoroethylene. The outer layer material is selected from polyurethane and polyamide containing barium sulfate, which have excellent comprehensive mechanical properties and good formability. The intermediate layer can be a metal reinforcement layer composed of stainless steel mesh and springs, or nickel-titanium mesh and springs, which is used to provide support. The outer surface of the guide catheter 2 is coated with a hydrophilic coating to reduce friction and improve pushing performance. The tube body of the guide extension catheter 3 has the same structure as the tube body of the guide catheter 2 and is also formed by a single flow forming of multiple layers of material. In addition, a plurality of connecting side holes 7 are provided on the guide extension catheter 3 to prevent blood flow blockage during surgery. A plurality of connecting side holes 7 are provided at the end of the guide extension catheter 3 close to the head, and the plurality of connecting side holes 7 are spirally distributed or symmetrically distributed on the side wall of the guide extension catheter 3.

[0044] Because a clearance groove 8 is provided on one side of the auxiliary catheter 4, the circumferential cross-section of the auxiliary catheter 4 is a circular groove with a groove. The central channel of the auxiliary catheter 4 is used to pass the guidewire 1, and the peripheral clearance groove 8 is used to pass the first pull-out push rod 5. The pushing axial cross-section of the guide member 11 is trapezoidal, and the end face of the guide member 11 in contact with the blood vessel is an outwardly convex arc. The tail of the auxiliary catheter 4 is provided with an auxiliary bevel 10 to facilitate the rapid exchange of instruments such as the guidewire 1. The auxiliary catheter 4 and the second pull-out push rod 9 are connected as a whole via the auxiliary bevel 10.

[0045] The tube body of the auxiliary catheter 4 is made of a single layer of high molecular polymer or multiple layers of high molecular polymer and metal material. The tip surface of the guide member 11 in contact with the blood vessel is a smooth arc surface, which can avoid damaging the blood vessel. Under the action of the pushing force, the guide member 11 can smoothly advance in the blood vessel. The outer layer material of the guide member 11 adopts a low-hardness high molecular polymer, which is soft and non-invasive. The middle layer is provided with a metal reinforcement layer, which appropriately improves the rigidity of the head end and increases the penetration ability of the guide part. The give way groove 8 on one side of the auxiliary catheter 4 is coated with a hydrophilic coating to increase the smoothness of the auxiliary catheter 4 when it is pushed along the guide extension catheter 3. The auxiliary catheter 4 and the guide extension catheter 3 are matched with the inner cavity gap to form a parent-child catheter.

[0046] When performing a thrombus aspiration operation using the guide extension catheter system provided in this embodiment, Figure 4 As shown, firstly, the guide wire 1 is placed into the patient's blood vessel, and then the guide catheter 2 is placed into the blood vessel under the guidance of the guide wire 1, and then the guide extension catheter 3 is smoothly inserted into the inner cavity of the guide catheter 2 under the guidance of the guide wire 1 and pushed to the target blood vessel position. Figure 5 As shown, the auxiliary catheter 4 passes through the external interface of the guide catheter 2 and enters the inner cavity of the guide catheter 2, so that the clearance groove 8 slides and engages with the first pull-out push rod 5, and the auxiliary catheter 4 is pushed forward along the first pull-out push rod 5. Figure 6 As shown, during the advancement of the auxiliary catheter 4, it enters the inner cavity of the guide extension catheter 3 through the guide exchange bevel 6, and finally passes through the head opening of the guide extension catheter 3. Under the action of the pushing force of the second pulling push rod 9, the guide member 11 that is in smooth contact with the blood vessel wall drives the guide extension catheter 3 to smoothly advance toward the distal end of the blood vessel, preventing the head opening of the guide extension catheter 3 from getting stuck on the blood vessel wall. The auxiliary catheter 4 adopts a groove design, and its outer diameter can be loosely matched with the inner diameter of the guide extension catheter 3 under the premise that its outer diameter can adapt to the inner diameter of the guide extension catheter 3 of the full diameter, so that the auxiliary catheter 4 can smoothly pass through the effective inner diameter of the guide catheter 2 and reach the position of the tortuous blood vessel. Its smooth and strong supporting guide part can drive the distal end of the guide extension catheter 3 to pass through the stuck position, ensuring the smooth progress of the operation.

[0047] The auxiliary catheter 4 provides a stronger support force and tracking for the guide extension catheter 3, guiding it to pass smoothly through the tortuous blood vessels. At the same time, the system has a better deep insertion capability and a high success rate for device delivery. Under the pushing force of the second pull-out push rod 9, the auxiliary catheter 4 drives the head of the guide extension catheter 3 to pass through the tortuous blood vessel position. When the device reaches the lesion position, the auxiliary catheter 4 or the guide extension catheter 3 can be directly withdrawn while ensuring that the guide wire 1 does not move and without adding additional devices such as the extension guide wire 1 and the pressure pump. The guide extension catheter system provided in this embodiment is based on the extension catheter technology. Under the premise of not affecting the device delivery capacity of the catheter system, it avoids the distal opening of the guide extension catheter 3 from getting stuck in the blood vessel wall, and safely and efficiently establishes a smooth channel for device delivery for percutaneous coronary intervention. It can meet the needs of most scenarios in percutaneous coronary intervention surgery, shorten the operator's preoperative device preparation time, and bring a more comfortable percutaneous coronary intervention surgical experience to patients.

[0048] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A guide extension catheter system, characterized in that: include: Guide catheter (2); A guide extension catheter (3) is arranged in the inner cavity of the guide catheter (2); the guide extension catheter (3) is a through-diameter tube, and the guide extension catheter (3) extends along the length direction of the guide catheter (2); a first pull-out push rod (5) is provided at the tail of the guide extension catheter (3), and the first pull-out push rod (5) extends to the outside of the guide catheter (2); The auxiliary catheter (4) has an outer diameter smaller than the inner diameter of the guide extension catheter (3); a clearance groove (8) is provided on one side of the auxiliary catheter (4); the clearance groove (8) is suitable for sliding and engaging with the first pulling push rod (5) along the length direction; the auxiliary catheter (4) is suitable for extending along the length direction of the inner cavity of the guide extension catheter (3) to the front end of the head of the guide extension catheter (3).

2. The guide extension catheter system according to claim 1, characterized in that The head of the auxiliary conduit (4) is provided with a guide member (11), and the end of the guide member (11) away from the auxiliary conduit (4) is in an arc shape that is axially convex outward.

3. The guide extension catheter system according to claim 2, characterized in that: The head of the guide member (11) is circular or oval.

4. The guide extension catheter system according to claim 2 or 3, characterized in that: The guide member (11) extends in a tapered shape in the length direction, and the end of the guide member (11) with a larger outer diameter is connected to the body of the auxiliary catheter (4).

5. The guide extension catheter system according to any one of claims 1 to 3, characterized in that: The tail of the auxiliary catheter (4) is provided with a second pull-out push rod (9), and the second pull-out push rod (9) extends outside the guide catheter (2).

6. The guide extension catheter system according to any one of claims 1 to 3, characterized in that: The opening at the tail of the guide extension catheter (3) is provided with a guide exchange oblique opening (6).

7. The guide extension catheter system according to any one of claims 1 to 3, characterized in that: A communicating side hole (7) is provided on the side of the guide extension catheter (3), and the communicating side hole (7) is arranged close to the head of the guide extension catheter (3).

8. The guide extension catheter system according to any one of claims 1 to 3, characterized in that: An auxiliary oblique opening (10) is provided at the opening of the tail of the auxiliary conduit (4).

9. The guide extension catheter system according to any one of claims 1 to 3, characterized in that: The outer surface of the guide extension catheter (3) is coated with a hydrophilic coating.

10. The guide extension catheter system according to any one of claims 1 to 3, characterized in that: The head of the guide extension catheter (3) is provided with a marking piece (12).

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