Radial artery nerve intervention guiding catheter

Abstract

The utility model provides a radial artery nerve intervention guide catheter, which relates to the technical field of medical instruments, and comprises a catheter main body, a support layer of the catheter main body is a braid layer, the far end of the catheter main body is connected with an extension part, and the extension part adopts a support layer structure different from the catheter main body, in particular to a winding layer. The braid layer is adopted at the near end of the catheter body to serve as the supporting layer, the anti-bending effect is good, the winding layer is adopted as the supporting layer of the extending portion of the far end of the catheter body, the anti-twisting performance is excellent, the supporting performance of the near end and the passing performance of the far end are both considered, and therefore enough aortic arch upper supporting force is provided, and a radial artery passage can be conveniently passed; in addition, a multifunctional tube is arranged to guide the catheter body, the far end of the multifunctional tube is pre-shaped, the guide catheter can bypass the aortic arch to enter a branch blood vessel and finally reach a target treatment part, and the problem that an existing guide catheter is not suitable for radial artery nerve intervention can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a radial artery nerve intervention guide catheter. Background Art

[0002] With the development and progress of neurointerventional technology and consumables, interventional surgery is increasingly being chosen for the treatment of stroke. Currently, the commonly used neurointerventional approaches in clinical practice mainly include transfemoral artery puncture and transradial artery puncture. Since femoral artery puncture requires lying flat and the lower limb on the puncture side to be straightened and immobilized for 12 to 24 hours after surgery, it brings many inconveniences to patients after surgery, such as back pain, fatigue, difficulty eating and defecation, and more postoperative complications.

[0003] Transradial artery puncture avoids the above shortcomings, but there are still few guide catheters specifically suitable for transradial artery puncture for whole brain vascular treatment. The main reason is that during transradial artery angiography, the cerebral blood supply artery on the aortic arch runs in the opposite direction at an acute angle to the guide catheter descending from the subclavian artery. The guide catheter cannot obtain sufficient support on the aortic arch, so the existing guide catheter cannot conveniently complete whole brain vascular treatment via the radial artery. In addition, the existing guide catheters use a single braided layer or winding layer, such as a braided layer or winding layer obtained by braiding or winding stainless steel wire or nylon wire. These guide catheters are difficult to have both pushing performance and anti-bending performance during use, and the neurointerventional physician's own operation requirements are also very high.

[0004] Therefore, there is an urgent need for a guide catheter that can provide support on the aortic arch and conveniently complete whole-brain vascular treatment via the radial artery of the upper arm. Summary of the invention

[0005] The purpose of the utility model is to provide a radial artery neurointerventional guide catheter, which has the advantages of a large inner lumen, a soft head end, and both proximal support and distal passability, optimizes the navigability and support of the transition zone, and makes it more stable for neurointerventional physicians to pass the device through the arm and torso to reach the brain, and can solve the problem of difficulty in crossing tortuous blood vessels near lesions.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A radial artery nerve intervention guide catheter comprises a catheter body, the support layer of the catheter body is a braided layer, the distal end of the catheter body is connected to an extension part, and the extension part adopts a support layer structure different from that of the catheter body.

[0008] Preferably, a connector made of shape memory alloy is used at the connection between the catheter body and the extension portion.

[0009] Preferably, the supporting layer of the extension portion is a winding layer.

[0010] Preferably, the inner walls of the catheter body and the extension portion are provided with a PTFE lubricating layer.

[0011] Preferably, the connecting piece is made of nickel-titanium shape memory alloy.

[0012] Preferably, the connecting piece is in a ring shape.

[0013] Preferably, it further comprises a multifunctional tube, the outer diameter of the multifunctional tube is smaller than the inner diameter of the catheter body, and the multifunctional tube is used to guide the catheter body to bypass the aortic arch.

[0014] Preferably, the distal end of the multifunctional tube is pre-shaped.

[0015] Preferably, the distal end of the multifunctional tube is pre-shaped into a Simmons 2 shape.

[0016] Beneficial effects:

[0017] (1) The radial artery neurointervention guide catheter provided by the utility model adopts a braided layer as a support layer at the proximal end of the catheter body to provide better support and good anti-bending effect, and adopts a winding layer as a support layer at the distal extension of the catheter body, which has excellent anti-kinking performance, can solve the problem of difficult crossing of tortuous blood vessels near the lesion, and takes into account both the proximal support and the distal passability, thereby providing sufficient support force on the aortic arch and facilitating passage through the radial artery;

[0018] (2) The connection between the catheter body and the extension part is made of shape memory alloy, which does not require welding and has the advantages of high joint strength and not easy to break. The traditional welding connection method will lead to a decrease in the strength of the welded joint, and will also cause stress concentration and destroy the density of the weld;

[0019] (3) A multifunctional tube is provided to guide the catheter body, and the distal end of the multifunctional tube is pre-shaped, which is conducive to guiding the catheter to bypass the aortic arch and enter the branch blood vessels, and finally reach the target treatment site, thereby improving the convenience of interventional operations and reducing the difficulty of operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0021] Figure 1 A schematic structural diagram of a guide catheter provided in an embodiment of the utility model.

[0022] Figure 2 for Figure 1Cross-sectional views of section AA and section BB.

[0023] Figure 3 A schematic diagram of a multifunctional tube provided in an embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of guiding the guide catheter through the multifunctional tube in the present invention.

[0025] Figure 5 This is a structural diagram of the pre-shaped portion at the distal end of the multifunctional tube.

[0026] Markings in the figure: 1. Catheter body; 2. Extension part; 3. Connector; 4. Multifunctional tube; 5. Loach guide wire. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present utility model, the term "proximal end" refers to an end close to an operator, and the term "distal end" refers to an end far from an operator.

[0031] In the description of the present utility model, the term "braided layer" refers to a tubular braided mesh structure formed by braiding metal wires or chemical fibers by a "1-on-2" or "2-on-2" method.

[0032] The term "wound layer" refers to a spring coil structure made of metal wire or chemical fiber by winding.

[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0034] The present invention will be described in detail below in conjunction with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0035] The utility model aims to solve the problem that the current guide catheter has difficulty in having both pushing performance and anti-bending performance, and provides a radial artery nerve intervention guide catheter, including a catheter body 1, such as Figures 1-2 As shown, the catheter body 1 includes a surface layer and a support layer, wherein the support layer is a braided layer. The catheter body 1 adopts a single braided layer structure to increase the bursting pressure of the guide catheter and has excellent twist control. An extension part 2 is connected to the distal end of the catheter body 1. The extension part 2 adopts a support layer structure different from that of the catheter body 1. More specifically, the extension part 2 adopts a winding layer as the support layer structure to enable the distal end of the catheter body 1 to obtain better twist control.

[0036] Through the above-mentioned arrangement, since the woven layer is used as the supporting layer structure, the support is better, so that the guide catheter can obtain sufficient supporting force on the aortic arch, thereby improving the bending resistance and passability of the guide catheter; by adopting a winding layer structure on the distal extension part 2 of the guide catheter, it has excellent anti-kink performance and can flexibly adapt to curved blood vessels; the utility model combines the catheter body 1 with the woven layer and the extension part 2 with the winding layer, so that the guide catheter has both pushing performance and anti-bending performance, and can better complete the establishment of the passage.

[0037] The supporting layer structures of the catheter body 1 and the extension part 2 are different and cannot be formed at one time. They need to make the braided layer and the winding layer separately and then connect them together. In this field, welding is generally used. However, welding has problems such as large heat input, more melting of the base material, and easy residual intermetallic compounds in the weld, which leads to reduced strength of the welded joint. In order to solve this problem, in the preferred embodiment of the utility model, Figure 1 , 2 As shown, a connector 3 made of a shape memory alloy is used at the connection between the catheter body 1 and the extension part 2. The connector 3 is annular and uses the heat shrinkage of the shape memory alloy to tighten the two ends of the braided layer and the winding layer.

[0038] Specifically, the processing and use process of the connecting piece 3 is as follows:

[0039] The nickel-titanium shape memory alloy is processed into a circular annular connector 3 with an inner diameter slightly smaller than the outer diameter of the braided layer and the winding layer, and then f ) to expand the diameter of the connector 3 so that its inner diameter is slightly larger than the outer diameter of the braided layer and the winding layer. At this time, the connector 3 is inserted into the junction of the braided layer and the winding layer, and then the temperature of the connector 3 is continued to be heated to the austenite transformation temperature (A s ) As described above, since the connector 3 has a shape memory effect, its inner diameter will shrink radially and tighten the winding layer and the braided layer, thereby completing the connection between the braided layer and the winding layer without welding.

[0040] The inner walls of the catheter body 1 and the extension part 2 are provided with a PTFE lubricating layer, which can reduce the friction force when the medical device passes through the guide catheter.

[0041] In the preferred implementation of the utility model, Figure 3 , 4 As shown, it also includes a multifunctional tube 4, the outer diameter of which is smaller than the inner diameter of the catheter body 1, and is used to guide the catheter body 1 to bypass the aortic arch.

[0042] Specifically, the distal end of the multifunctional tube 4 is pre-shaped to a shape of Simmons 2 (also known as Simmons II), such as Figure 5 As shown, the distal pre-shaped portion of the multifunctional tube 4 includes a first bending section, a first straight tube section, a second bending section, a second straight tube section, a third bending section and a third straight tube section at the end in sequence, wherein the first bending section, the second bending section and the third bending section are all arc-shaped, the radius R1 of the first bending section is 18±1mm, and the center angle θ1 is 180-240° (for example, 180°, 195°, 210°, 240°), the radius R2 of the second bending section is 9±1mm, and the center angle θ2 is 15±2°, the radius R3 of the third bending section is 18±1mm, and the center angle θ3 is 65±5°, the first straight tube section The lengths of the second straight tube section and the third straight tube section are selected as needed. In the standby state, the loach guide wire 5 is used to pass the multifunctional tube 4 to maintain its straight shape. When in use, the multifunctional tube 4 is inserted into the guide catheter, and the distal end of the multifunctional tube 4 is sent to the aortic arch through the radial artery, and then the loach guide wire 5 is withdrawn, so that the distal end of the multifunctional tube 4 automatically returns to the pre-shaped Simmons2 shape, and the guide catheter can be pushed to make it bypass the aortic arch along the multifunctional tube 4 and enter the branch blood vessels, and finally reach the target treatment site, and then the multifunctional tube 4 is withdrawn, and other medical devices can be delivered through the guide catheter.

[0043] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A radial artery nerve intervention guide catheter, comprising a catheter body, characterized in that: The supporting layer of the catheter body is a braided layer, and the distal end of the catheter body is connected with an extension part, and the extension part adopts a supporting layer structure different from that of the catheter body.

2. A radial artery neurointerventional guide catheter according to claim 1, characterized in that: The connection between the catheter body and the extension part uses a connector made of shape memory alloy.

3. A radial artery neurointerventional guide catheter according to claim 1, characterized in that: The supporting layer of the extension portion is a winding layer.

4. A radial artery neurointerventional guide catheter according to claim 1, characterized in that: The inner walls of the catheter body and the extension portion are provided with a PTFE lubricating layer.

5. A radial artery nerve intervention guide catheter according to claim 2, characterized in that: The connecting piece is made of nickel-titanium shape memory alloy.

6. A radial artery nerve intervention guide catheter according to claim 5, characterized in that: The connecting piece is in a circular ring shape.

7. A radial artery neurointerventional guide catheter according to any one of claims 1 to 6, characterized in that: Also included is a multifunctional tube, the outer diameter of which is smaller than the inner diameter of the catheter body, and the multifunctional tube is used to guide the catheter body to bypass the aortic arch.

8. The radial artery nerve intervention guide catheter according to claim 7, characterized in that: The distal end of the multifunctional tube is pre-shaped.

9. A radial artery nerve intervention guide catheter according to claim 8, characterized in that: The distal end of the multifunctional tube is pre-shaped into a Simmons 2 shape.

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