Radial artery angiography cannula

Abstract

The utility model provides a radial artery angiography sleeve pipe relates to medical instrument technical field, including inner tube and sleeve pipe, inner tube includes inner tube catheter seat and inner tube tube body, sleeve pipe includes sleeve pipe catheter seat and sleeve pipe tube body, is provided with joint part on inner tube catheter seat, joint part can be connected with sleeve pipe catheter seat cooperation, when using, the inner tube tube body is worn into sleeve pipe tube body, through joint part and sleeve pipe catheter seat, can lock cooperation between sleeve pipe and inner tube, and the adaptability is good, and it is not easy to cause gas embolism or thrombus, and the end of the middle cavity is closed in locking position, and blood will not overflow, avoid affecting operation operation, when the inner tube and sleeve pipe are synchronous in superselecting the big blood vessel on the bow, and the sleeve pipe and the inner tube are separated after pointing to the target blood vessel, and under the support of guide wire and inner tube, it is superselected to the target blood vessel to the distal end, and the controllability of catheter is increased, and the difficulty of superselection is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to radial artery angiography cannula. Background Technology

[0002] Angiography catheters are the most important material in cerebral angiography. In the practice of cerebral angiography via the femoral artery approach, researchers have developed numerous catheters with various tip shapes to accommodate different anatomical structures and target vessel superselection. Among these, the most commonly used tip shapes are single-bend (vertebral artery canal), hunter's head, and SIM. The route required for the radial artery approach is different from that of the femoral artery approach, and the most commonly used angiography catheters such as the single-bend catheter of the femoral artery approach cannot be used directly to complete whole-brain angiography.

[0003] Currently, there is no catheter specifically designed for cerebral angiography via the radial artery approach. In practice, clinicians typically use angiography catheters with a compound bend at the tip. While the compound bend at the tip facilitates the identification of the major vessel openings above the arch, it also hinders further superselective angiography of the major vessel branches, making superselective angiography difficult and affecting the quality of cerebral angiography, potentially leading to misdiagnosis or missed diagnosis. Direct angiography using catheters such as SIM has a low accuracy rate, is difficult, and is prone to complications. Using self-made combination catheters has poor compatibility and is prone to thrombotic complications.

[0004] Poor compatibility is mainly manifested in the following ways: blood will continuously overflow from the cavity between the inner and outer tubes, affecting the surgical procedure; when the outer tube is overselected, the inner tube on the outside is not synchronized, which means that the outer tube can only be twisted / pushed from the handle, reducing the maneuverability of the outer tube and increasing the difficulty of overselection.

[0005] This application is filed to address the aforementioned deficiencies. Utility Model Content

[0006] The purpose of this invention is to provide a radial artery angiography cannula specifically designed for cerebral angiography via the radial artery approach. By setting up an inner tube and an outer tube that can be combined, the operability and positioning of the outer tube and the inner tube are ensured. Compared with self-made combined catheters, it improves adaptability, solves the problem of blood and air bubbles overflowing from the cavity between the tubes, and has a higher positioning rate than catheters such as SIM.

[0007] To address the aforementioned issues, this invention provides a radial artery angiography cannula, comprising an inner tube and an outer tube. The inner tube includes an inner tube seat and an inner tube body, while the outer tube includes an outer tube seat and an outer tube body. The inner tube seat has a connector that mates with the outer tube seat. During use, the inner tube body is inserted into the outer tube body. The connector and the outer tube seat combine to form a single unit, improving compatibility and reducing the risk of gas embolism or thrombosis. Superselective insertion is synchronized with the inner tube and the outer tube, increasing catheter maneuverability, reducing the difficulty of superselection, and improving the operability of the inner tube. Furthermore, it seals the cavity between the inner and outer tube bodies, preventing blood leakage or air bubbles at the cavity's end, thus avoiding interference with surgical procedures.

[0008] According to one embodiment of the present invention, the inner tube catheter seat is further provided with an instrument adapter connector for adapting to the connectors of instruments such as syringes / infusion pumps.

[0009] According to one embodiment of the present invention, the connector is a Luer cap with internal threads, and the instrument adapter is a male Luer connector. The two are separately configured, and the Luer cap can be rotated independently on the instrument adapter.

[0010] Alternatively, the locking design of the inner tube and the outer tube can also adopt a structure that can achieve locking and snap-fit ​​connection, such as a rubber ring tightening valve. The structure only needs to be able to lock the inner tube and the outer tube and seal the intermediate cavity.

[0011] Similarly, the instrument adapter is not limited to Luer connectors; any connector structure that can be used to connect with other instruments is acceptable.

[0012] According to one embodiment of the present invention, the inner tube body and / or outer tube body are multi-layered structures, the multi-layered structure including an inner layer, an intermediate layer and an outer layer, the intermediate layer being a reinforcing layer.

[0013] According to one embodiment of the present invention, the inner layer of the outer tube is made of a smooth polymer material, such as PTFE, which has smooth properties and provides a smooth inner wall.

[0014] According to one embodiment of the present invention, the outer layer of the inner tube body and the outer tube body is made of a polymer material, such as TPUPEBAX, nylon, etc.

[0015] According to one embodiment of the present invention, the intermediate layer is made of metal wire, which provides radial and axial support for the conduit. It is fixed to the inner layer by means of spring winding or braiding. The metal wire can be made of materials such as nickel-titanium or stainless steel.

[0016] According to one embodiment of the present invention, the hardness of the inner tube and / or outer tube decreases from the operating end (also known as the proximal end or tail end) to the patient end (also known as the distal end or head end), which increases the catheter's positioning accuracy and adapts to the complex vascular pathways of the radial artery.

[0017] Optionally, the decrease in hardness is achieved by a change in the hardness of the outer layer. In other embodiments, a combination of inner layers, intermediate layers, or multiple layers can be used to achieve the change in hardness.

[0018] Optionally, both the inner wall of the outer cannula and the proximal position of the outer wall of the inner cannula are coated with heparin to reduce blood backflow and clotting caused by gaps, prevent thrombosis, and reduce intraoperative and postoperative risks.

[0019] According to one embodiment of the present invention, the patient end of the inner tube is provided with a curved structure, preferably a composite curve. The composite curve of the inner tube completes the function of hooking the opening, and the outer tube completes the function of further super-selection to the distal end, which is used to adapt to the radial artery and facilitate super-selection.

[0020] The beneficial effects of this invention are that by setting the connector and the outer cannula catheter seat, the outer cannula and the inner cannula can be locked together, which has good adaptability. Moreover, the inner and outer surfaces of the lumen between the inner and outer cannulas are coated with heparin, which makes it less likely to cause gas embolism or thrombosis. Furthermore, through the Luer tight fit, the locking position seals the end of the middle cavity, preventing blood leakage and avoiding affecting the surgical operation. When superselecting large blood vessels on the arch, the inner cannula and the outer cannula are synchronized. After pointing to the target blood vessel, the outer cannula separates from the inner cannula and is superselected distally to the target blood vessel under the support of the guidewire and the inner cannula, which increases the maneuverability of the catheter and reduces the difficulty of superselection. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 A schematic diagram of the overall structure of the radial artery angiography cannula;

[0023] Figure 2 This is a schematic diagram of the inner tube structure;

[0024] Figure 3 This is a schematic diagram of the outer casing.

[0025] Figure 4 This is a schematic diagram of the inner tube conduit seat structure;

[0026] Figure 5 This is a sectional view of the inner tube conduit seat;

[0027] Figure 6 This is a structural diagram of the outer tube body and the inner tube body;

[0028] Figure 7This is a schematic diagram showing the working state of the radial artery angiography cannula. Detailed Implementation

[0029] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0030]

Example 1

[0031] Radial artery angiography cannula, such as Figure 1 It includes an inner tube 1 and an outer tube 2. During the superselective procedure, the inner tube 1 is inserted into the outer tube 2.

[0032] like Figure 2 The inner tube 1 includes an inner tube conduit seat 11 and an inner tube body 12. The structure of the inner tube conduit seat 11 is as follows: Figure 4 , Figure 5 The device consists of two parts: a device adapter 31 and a connector 32. The connector 32 is a Luer cap with internal threads, which is adapted to the male Luer connector side of the outer cannula catheter seat 21. The device adapter 31 is a male Luer connector, which is used to adapt to the connectors of instruments such as syringes / infusion pumps.

[0033] Preferably, the instrument adapter 31 and the connector 32 are separate and rotatably connected. The connector 32 can rotate on the instrument adapter 31, so that when the connector 32 is connected to the outer cannula catheter seat 21, rotating the connector 32 locks it with the outer cannula catheter seat 21. During the locking process, the instrument adapter 31 and the outer cannula catheter seat 21 will not rotate, avoiding the torsion problem of the inner tube body 12 and the outer tube body 22 during the locking process.

[0034] The patient end of the inner tube has a curved structure to accommodate the radial artery and facilitate superselection.

[0035] like Figure 3The outer cannula 2 includes an outer cannula catheter seat 21 and an outer cannula body 22. The outer cannula catheter seat 21 and the outer cannula body 22 are non-rigidly connected, such as by adhesive bonding or injection molding, to avoid kinking of the outer cannula body 22. The connector 32 can be connected with the outer cannula catheter seat 21 to achieve locking. By using the connection between the connector 32 and the outer cannula catheter seat 21, the inner cannula 1 and the outer cannula 2 are combined together, improving compatibility and reducing the risk of gas embolism or thrombosis. During superselection, it is synchronized with the inner cannula and the outer cannula, increasing the maneuverability of the catheter, reducing the difficulty of superselection, improving the operability of the inner cannula 1, and sealing the end of the cavity between the inner cannula body 12 and the outer cannula body 22, preventing blood from overflowing or air bubbles from appearing at the end of the cavity, thus avoiding affecting the surgical operation.

[0036] Work status as Figure 7 As shown in the figure above, the outer tube 2 and the inner tube 1 are combined (connected by a connector): After the outer tube 2 is inserted into the inner tube 1, the Luer cap of the connector 32 is twisted so that the Luer cap with internal threads of the connector 32 is connected to the male Luer connector of the guide tube seat 21, and the locking state is achieved.

[0037] The following diagram shows the outer cannula 2 moving distally along the inner cannula 1 after it has been positioned: the Luer cap of the connector 32 is twisted in the opposite direction to release the locking between the connector 32 and the catheter seat 21, and the outer cannula moves distally along the inner cannula towards the patient.

[0038] In other embodiments, the locking design of the inner tube and the outer tube can also adopt a structure that can achieve locking and engaging connection, such as a rubber ring tightening valve. The structure only needs to be able to lock the inner tube and the outer tube and close the intermediate cavity.

[0039] like Figure 6 Both the inner tube body 12 and the outer tube body 22 are multi-layered structures, including an inner layer 41, a middle layer 42 and an outer layer 43, with the middle layer being a reinforcing layer.

[0040] The inner layer 41 is made of a smooth polymer material, such as PTFE (polytetrafluoroethylene), which gives the inner wall of the outer tube 22 a smooth characteristic, providing a smooth insertion experience.

[0041] The outer layer 43 is made of polymer materials, such as TPUPEBAX, nylon, etc.

[0042] The intermediate layer 42 is made of metal wire, which provides radial and axial support for the conduit. It is fixed to the inner layer 41 by means of spring winding, braiding, etc. The metal wire can be made of materials such as nickel-titanium or stainless steel.

[0043] Furthermore, the hardness of the inner tube body 12 and the outer tube body 22 decreases from the operating end to the patient end, which increases the catheter's positioning accuracy and adapts to the complex vascular pathways of the radial artery.

[0044] Furthermore, a heparin coating is applied to the inner wall of the outer cannula 22 and the proximal end of the outer wall of the inner cannula 12 to reduce blood backflow and coagulation caused by the catheter gap, thus preventing the formation of thrombus fragments in the gap.

[0045] Example 2:

[0046] Based on Example 1, the diameter of the catheter is increased in this example.

[0047] The inner tube body diameter range is: ID: 0.5-1.5mm, OD: 1.0-2.0mm;

[0048] The diameter range of the outer tube body 22 is: ID: 1.0-2mm, OD: 1.5-2.5mm;

[0049] Preferably, the inner tube body 12 has the following diameters: ID: 1.06±0.1mm, OD: 1.37±0.1mm;

[0050] Outer tube body diameter: ID: 1.50±0.1mm OD: 1.82±0.1mm.

[0051] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A radial artery angiography cannula, characterized in that: The device includes an inner tube (1) and an outer tube (2). The inner tube (1) includes an inner tube conduit seat (11) and an inner tube body (12). The outer tube (2) includes an outer tube conduit seat (21) and an outer tube body (22). The inner tube conduit seat (11) is provided with a connector (32). The connector (32) can be connected with the outer tube conduit seat (21). When in use, the inner tube body (12) is inserted into the outer tube body (22). By using the connection between the connector (32) and the outer tube conduit seat (21), the inner tube (1) and the outer tube (2) are connected together, improving the operability of the inner tube (1) and sealing the cavity between the inner tube body (12) and the outer tube body (22).

2. The radial artery angiography cannula according to claim 1, characterized in that: The inner tube catheter seat (11) is also provided with a device adapter connector (31).

3. The radial artery angiography cannula according to claim 2, characterized in that: The connector (32) is a Luer cap with internal threads, and the instrument adapter (31) is a male Luer connector. The connector (32) and the instrument adapter (31) are separate components.

4. The radial artery angiography cannula according to any one of claims 1-3, characterized in that: The inner tube body (12) and / or outer tube body (22) are multi-layered structures, including an inner layer (41), a middle layer (42) and an outer layer (43), wherein the middle layer is a reinforcing layer.

5. The radial artery angiography cannula according to claim 4, characterized in that: The inner layer (41) of the outer tube body (22) is made of a smooth polymer material.

6. The radial artery angiography cannula according to claim 5, characterized in that: The outer layer (43) is made of polymer material.

7. The radial artery angiography cannula according to claim 6, characterized in that: The intermediate layer (42) is made of metal wire and is fixed to the inner layer (41) by means of spring winding or weaving.

8. The radial artery angiography cannula according to any one of claims 5-7, characterized in that: The hardness of the inner tube body (12) and / or the outer tube body (22) decreases from the operating end to the patient end; the decrease in hardness is achieved by the change in hardness of the outer layer (43).

9. The radial artery angiography cannula according to claim 8, characterized in that: The patient end of the inner tube (12) is provided with a curved structure.

10. The radial artery angiography cannula according to claim 8, characterized in that: The inner tube body (12) and the outer tube body (22) are provided with heparin coating on their proximal outer wall.

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