Guiding catheter with self-anchoring function

Abstract

The utility model relates to medical instrument technical field discloses a guide catheter with the function of anchoring guide wire, including the inner layer and the outer layer of compound setting, the inner layer part of guide catheter distal end is equipped with hole body, and the hole body is equipped with film piece with guide catheter inner chamber, be provided with the fullness chamber between the inner layer and the outer layer for the fullness film piece to guide catheter inner bulge and form balloon, the utility model discloses through setting the fullness chamber of the inner wall setting of guide catheter, can make the film form balloon through the pressure of filling pressure chamber, directly anchor the guide wire when withdrawing the microcatheter, prevent the guide wire from withdrawing, need not use the anchoring balloon again, save time and instrument use.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a guiding catheter with built-in guidewire anchoring function. Background Technology

[0002] Typically, a guiding catheter is used for guidance during interventional procedures. The main functions of the guiding catheter are to deliver interventional devices, inject contrast agents and drugs, and monitor coronary artery pressure.

[0003] Chinese patent CN 221787796 U discloses a guiding catheter. This guiding catheter includes: a main body segment; a transition segment disposed distal to the main body segment for supporting the guiding catheter; a contrast-enhancing segment disposed distal to the transition segment, the contrast-enhancing segment having a contrast-enhancing function to visualize the guiding catheter's position within the blood vessel; and a flexible segment disposed distal to the contrast-enhancing segment for guiding the guiding catheter's movement within the blood vessel; at least one of the flexible segment, transition segment, and main body segment has a contrast-enhancing function. The flexible segment allows the guiding catheter to smoothly enter the blood vessel, while the transition segment and supporting segment ensure the guiding catheter has a certain structural strength, giving it resistance to bending and torsional conduction. Furthermore, the guiding catheter, through the contrast-enhancing segment in conjunction with the contrast-enhancing flexible segment, transition segment, or supporting segment, achieves better contrast enhancement, facilitating rapid positioning of the guiding catheter by the surgeon and improving surgical efficiency.

[0004] However, when using existing technology, the guiding catheter does not have the function of anchoring the guidewire. When withdrawing the microcatheter, the guidewire may be pulled back. Therefore, an additional anchoring balloon is required, which affects efficiency. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing a guiding catheter with built-in guide wire anchoring function.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A guiding catheter with built-in guidewire anchoring function includes an inner layer and an outer layer with a composite configuration; The inner layer of the distal end of the guiding catheter has a hole, and a thin film is provided between the hole and the inner cavity of the guiding catheter. An inflation cavity is provided between the inner layer and the outer layer to inflate the thin film and protrude into the guiding catheter to form a balloon.

[0007] Preferably, the inner layer, serving as the lubrication cavity of the guiding catheter, is integrally molded from a low-friction material.

[0008] Preferably, the inner layer is integrally molded using PTFE or HDPE.

[0009] Preferably, the outer layer is integrally molded from Pebax material.

[0010] Preferably, a stainless steel braided layer is provided between the outer layer and the inner layer to enhance the support of the guiding catheter.

[0011] Preferably, a radiopaque ring is provided at the proximal end of the film element to indicate the position of the microcatheter retraction.

[0012] Preferably, the proximal end of the guiding catheter is provided with a catheter seat, which is a Y-shaped double-lumen catheter seat. One lumen is used to guide the instrument into the guiding catheter, and the other lumen is used to connect the inflating instrument to pressurize the membrane to form a capsule through the filling lumen. After the microcatheter is withdrawn, negative pressure can be drawn to make the membrane re-adhere to the tube wall without affecting the subsequent introduction of other instruments through the guiding catheter.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention features an inflation chamber on the inner wall of the guiding catheter. The inflation chamber can be used to pressurize the membrane to form a balloon, which can directly anchor the guidewire during microcatheter withdrawal, preventing the guidewire from retracting. This eliminates the need for an additional anchoring balloon, saving time and equipment usage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a guiding catheter with built-in guidewire anchoring function proposed in this utility model. Figure 2 This is a schematic diagram of a guide catheter seat with built-in guidewire anchoring function proposed in this utility model; Figure 3 This is a schematic diagram of the unpressurized state of a guiding catheter with built-in guidewire anchoring function proposed in this utility model. Figure 4 This is a schematic diagram of the pressurization state of a guiding catheter with built-in guidewire anchoring function proposed in this utility model.

[0015] In the diagram: 1. Outer layer; 2. Inner layer; 3. Filling cavity; 4. Membrane component; 5. Stainless steel braided layer; 6. Catheter seat; 7. Pressurization cavity; 8. Guiding cavity; 9. Guiding catheter. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figures 1-4 A guiding catheter 9 with built-in guidewire anchoring function includes an inner layer 2 and an outer layer 1 that are compositely configured; The inner layer 2 of the distal end of the guiding catheter 9 (i.e. the side away from the medical staff's operating end) has a hole, and a thin film 4 is provided between the hole and the inner cavity of the guiding catheter 9. An inflation cavity 3 is provided between the inner layer 2 and the outer layer 1 to inflate the thin film 4 into the guiding catheter 9 to form a balloon.

[0018] When using this guiding catheter 9, an inflation chamber 3 is provided on the inner wall of the guiding catheter 9. The pressure chamber 7 is used to pressurize the membrane to form a balloon, which can directly anchor the guidewire when withdrawing the microcatheter, preventing the guidewire from retracting. There is no need to use an additional anchoring balloon, saving time and instrument usage.

[0019] In this embodiment, the inner layer 2 serves as the lubricating lumen of the guiding catheter 9. It is integrally molded with PTFE or HDPE, which can significantly reduce the friction between the guiding catheter 9 and the implanted device (such as a stent), and reduce the resistance when pushing the device. It is especially easier to pass through tortuous blood vessels, reducing operator fatigue and improving surgical efficiency.

[0020] In this embodiment, the outer layer 1 is integrally molded from PEBAX material. PEBAX is a thermoplastic elastomer in which the hard segments (polyamide) provide rigidity and the soft segments (polyether) impart flexibility. By adjusting the ratio of hard segments to soft segments, the material hardness (e.g., from 25D to 72D) can be customized to meet the different catheter requirements for pushing force, bending resistance, and pressure resistance. The integrally molded PEBAX outer layer 1 is not prone to collapse or twisting when bent, making it particularly suitable for tortuous vascular pathways (such as coronary arteries and cerebral blood vessels), ensuring the patency of the catheter in complex anatomical structures.

[0021] In this embodiment, a stainless steel braided layer 5 is provided between the outer layer 1 and the inner layer 2 to enhance the support of the guiding catheter 9. The mesh structure of the stainless steel braided layer 5 provides rigid support in the axial direction of the catheter, so that the catheter resists bending deformation during the push process. It is especially suitable for passing through tortuous blood vessels (such as iliac arteries, coronary artery branches) or calcified lesions to avoid catheter collapse.

[0022] In this embodiment, a radiopaque ring (not shown in the figure) is provided at the proximal end of the thin film 4 to indicate the position of the microcatheter retraction.

[0023] In this embodiment, the proximal end of the guiding catheter 9 is provided with a catheter seat 6. The catheter seat 6 is a Y-shaped double-lumen seat, including a guiding cavity 8 and a filling cavity 7. The guiding cavity 8 is used to guide the instrument into the guiding catheter 9 (the end of the guiding catheter 9 corresponding to the guiding cavity 8 is designed to be open). The filling cavity 7 is used to connect the filling instrument to pressurize the membrane 4 through the filling cavity 3 to form a capsule (the outer layer 1 of the guiding catheter 9 has an opening at the part corresponding to the filling cavity 7, and gas enters the filling cavity 3 through the opening). After the microcatheter is withdrawn, the negative pressure can be drawn to make the membrane 4 re-attach to the tube wall without affecting the subsequent introduction of other instruments through the guiding catheter 9.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A guiding catheter with built-in guidewire anchoring function, characterized in that: It includes an inner layer (2) and an outer layer (1) with a composite configuration; The inner layer (2) at the distal end of the guiding catheter (9) has a hole, and a thin film (4) is provided between the hole and the inner cavity of the guiding catheter (9). An filling cavity (3) is provided between the inner layer (2) and the outer layer (1) to fill the thin film (4) and protrude into the guiding catheter (9) to form a balloon.

2. The guiding catheter with built-in guidewire anchoring function according to claim 1, characterized in that: The inner layer (2) serves as the lubrication cavity of the guiding conduit (9) and is integrally formed using a low-friction material.

3. The guiding catheter with built-in guidewire anchoring function according to claim 2, characterized in that: The inner layer (2) is integrally molded using PTFE or HDPE.

4. A guiding catheter with built-in guidewire anchoring function according to claim 3, characterized in that: The outer layer (1) is integrally molded using Pebax material.

5. A guiding catheter with built-in guidewire anchoring function according to claim 4, characterized in that: A stainless steel braided layer is provided between the outer layer (1) and the inner layer (2) to enhance the support of the guiding catheter (9).

6. A guiding catheter with built-in guidewire anchoring function according to claim 1, characterized in that: The proximal end of the thin film (4) is provided with a radiopaque ring for indicating the position of the microcatheter retraction.

7. A guiding catheter with built-in guidewire anchoring function according to claim 6, characterized in that: The proximal end of the guiding catheter (9) is provided with a catheter seat (6), which is a Y-shaped double-lumen catheter seat. One lumen is used to guide the instrument into the guiding catheter (9), and the other lumen is used to connect the pressurizing instrument to press the membrane (4) through the filling chamber (3) to form a capsule. After the microcatheter is withdrawn, the negative pressure can be drawn to make the membrane (4) reattach to the tube wall without affecting the subsequent introduction of other instruments through the guiding catheter (9).

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