Radial artery radiography cannula

Abstract

The invention provides a radial artery radiography cannula, and relates to the technical field of medical instruments, the radial artery radiography cannula comprises an inner tube and an outer cannula, the inner tube comprises an inner tube catheter seat and an inner tube body, the outer cannula comprises an outer cannula catheter seat and an outer cannula body, the inner tube catheter seat is provided with a connector part, and the connector part can be connected with the outer cannula catheter seat in a matched mode. The inner tube body penetrates into the outer tube body, the outer tube and the inner tube can be locked and matched through the connector part and the outer tube catheter base, the adaptability is good, gas embolism or thrombus is not prone to being caused, the end of the middle cavity is sealed through the locking position, blood cannot overflow, and the influence on surgical operation is avoided; the inner tube and the outer tube are synchronous when a large blood vessel on an arch is subjected to super-selection, the outer tube and the inner tube are separated after the outer tube points to a target blood vessel, super-selection is conducted towards the far end to the target blood vessel under the support of the guide wire and the inner tube, the controllability of the catheter is improved, and the super-selection difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a radial artery angiography cannula. Background Art

[0002] The catheter is the most important material for cerebral angiography. In the practice of cerebral angiography via the femoral artery, in order to adapt to different anatomical structures and target vascular superselection, previous researchers have developed catheters with many head shapes, among which the most commonly used head shapes are single bend (vertebral artery tube), hunter head, SIM, etc. The radial artery approach requires a different route than the femoral artery approach, and it is impossible to directly use the single bend catheter, which is the most commonly used catheter for the femoral artery approach, to complete whole-brain angiography.

[0003] However, there is no catheter specifically used for cerebral angiography via radial artery in clinical practice. In actual operation, clinicians usually use angiography catheters with a compound bend at the tip. Due to the presence of the compound bend at the tip, it is convenient to select the openings of the major blood vessels on the arch, but it hinders further superselection of the major blood vessel branches, which makes superselective angiography difficult, resulting in the quality of cerebral angiography, which may cause misdiagnosis or missed diagnosis; direct angiography using catheters such as SIM has a low placement rate, is difficult, and is prone to complications; the method of using homemade combined catheters has poor adaptability and is prone to thrombotic complications.

[0004] The poor adaptability is mainly manifested in: blood will continue to overflow from the cavity between the inner tube and the outer tube, affecting the surgical operation; when the outer tube is superselected, the inner tube on the outside is not synchronized, resulting in the outer tube only being able to be twisted / pushed from the handle, which reduces the maneuverability of the outer tube and increases the difficulty of superselection.

[0005] In view of the above-mentioned defects, this application is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a radial artery angiography cannula specially used for cerebral angiography via radial artery access. By providing 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, the adaptability is improved compared with a homemade combined catheter, the problem of blood and bubble overflow in the cavity between the tubes is solved, and the positioning rate is higher than that of catheters such as SIM.

[0007] To solve the above problems, the present invention provides a radial artery angiography cannula, comprising an inner tube and an outer tube, the inner tube comprising an inner tube catheter seat and an inner tube body, the outer tube comprising an outer tube catheter seat and an outer tube body, the inner tube catheter seat is provided with a joint portion, the joint portion can be connected with the outer tube catheter seat, when in use, the inner tube body is inserted into the outer tube body, and the inner tube and the outer tube are combined together by utilizing the combination of the joint portion and the outer tube catheter seat, so as to improve adaptability, not easily cause gas embolism or thrombosis, synchronize with the inner tube and the outer tube during superselection, increase the maneuverability of the catheter, reduce the difficulty of superselection, improve the operability of the inner tube, and seal the cavity between the inner tube body and the outer tube body, so that blood will not overflow or bubbles will not appear at the end of the cavity, thereby avoiding affecting the surgical operation.

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

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

[0010] Optionally, the locking design of the inner tube and the outer sleeve may also adopt a structure such as a rubber ring elastic valve that can achieve locking and snap connection, and the structure only needs to be able to achieve locking of the inner tube and the outer sleeve and sealing of the middle cavity.

[0011] Likewise, the instrument adapter is not limited to a Luer connector, and any connector structure that can be used to achieve connection with other instruments is acceptable.

[0012] According to an embodiment of the present invention, the inner tube body and / or the outer tube body is a multi-layer structure, and the multi-layer structure includes an inner layer, a middle layer and an outer layer, and the middle layer is a reinforcement layer.

[0013] According to an embodiment of the present invention, the inner layer of the outer sleeve body is configured to be a smooth polymer material, such as PTFE, which has a smooth property and provides a smooth inner wall.

[0014] According to an embodiment of the present invention, the outer layers of the inner tube body and the outer tube body are set to be a polymer material, such as TPUPEBAX, nylon, etc.

[0015] According to an embodiment of the present invention, the middle layer uses metal wires to provide radial and axial support for the catheter, and is fixed to the inner layer by winding springs or weaving. The metal wires can be made of nickel titanium, stainless steel, or other materials.

[0016] According to one embodiment of the present invention, the hardness of the inner tube body and / or the outer tube body decreases from the operating end (also called the proximal end or tail end) to the patient end (also called the distal end or head end), thereby increasing the positioning of the catheter and adapting to the complex vascular circuit of the radial artery.

[0017] Optionally, the hardness decrease is achieved by changing the hardness of the outer layer. In other embodiments, the hardness change can be achieved by using an inner layer, an intermediate layer or multiple layers.

[0018] Optionally, the inner wall of the outer tube and the proximal end of the outer wall of the inner tube are both coated with heparin to reduce blood reflux and clotting caused by the gap, prevent the formation of thrombus, and reduce intraoperative and postoperative risks.

[0019] According to one embodiment of the present invention, the patient end of the inner tube body is provided with a curved structure, preferably a compound curve, the compound curve of the inner tube completes the function of selecting and opening, and the outer tube completes the function of further superselection toward the distal end, which is used to adapt to the radial artery blood vessel and facilitate superselection.

[0020] The beneficial effects of the present invention are that, by providing a joint part and an outer sleeve catheter seat, the outer sleeve and the inner tube can be locked and matched, and have good adaptability. The inner and outer surfaces of the lumen between the inner tube and the outer sleeve are covered with a heparin coating, which is not easy to cause gas embolism or thrombosis. The locking position closes the end of the middle cavity through the Luer tight fit, and blood will not overflow, avoiding affecting the surgical operation. When superselecting the large blood vessels on the arch, the inner tube is synchronized with the outer sleeve, and the outer sleeve is separated from the inner tube after pointing to the target blood vessel, and is superselected to the target blood vessel distally under the support of the guide wire and the inner tube, thereby increasing the maneuverability of the catheter and reducing the difficulty of superselection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

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

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

[0024] Figure 3 is a schematic diagram of the structure of the outer sleeve;

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

[0026] Figure 5 is a cross-sectional view of the inner tube catheter seat;

[0027] Figure 6 It is a schematic diagram of the structure of the outer tube body and the inner tube body;

[0028] Figure 7 This is a schematic diagram of the working status of the radial artery angiography cannula. DETAILED DESCRIPTION

[0029] The following description is only used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only for example, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not deviate from the spirit and scope of the present invention.

[0030] [Example 1]

[0031] Radial artery angiography cannula, such as Figure 1 , including an inner tube 1 and an outer tube 2. When performing superselection operation during surgery, the inner tube 1 is inserted into the outer tube 2.

[0032] like Figure 2 The inner tube 1 includes an inner tube catheter seat 11 and an inner tube body 12. The inner tube catheter seat 11 has a structure as shown in FIG. Figure 4 , Figure 5 The two parts are an instrument adapter 31 and a connector 32. The connector 32 is a Luer cap with an internal thread, which is adapted to the male Luer connector side of the outer sleeve catheter seat 21. The instrument 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 joint 31 and the joint part 32 are separately arranged, and the two are rotatably matched. The joint part 32 can rotate on the instrument adapter joint 31, so that when the joint part 32 is connected to the outer sleeve catheter seat 21, the rotating joint part 32 is locked with the outer sleeve catheter seat 21. During the locking process, the instrument adapter joint 31 and the outer sleeve catheter seat 21 will not rotate, thereby avoiding the twisting problem of the inner tube body 12 and the outer sleeve body 22 during the locking process.

[0034] The patient end of the inner tube body 12 is provided with a curved structure for adapting to the radial artery blood vessel to facilitate superselection.

[0035] like Figure 3The outer sleeve 2 includes an outer sleeve catheter seat 21 and an outer sleeve body 22. The outer sleeve catheter seat 21 and the outer sleeve body 22 are non-rigidly connected, such as by glue bonding or overmolding, to avoid the outer sleeve body 22 from being kinked. The joint part 32 can be connected with the outer sleeve catheter seat 21 to achieve locking. The combination of the joint part 32 and the outer sleeve catheter seat 21 is used to combine the inner tube 1 and the outer sleeve 2 together, thereby improving adaptability and not easily causing gas embolism or thrombosis. During superselection, it is synchronized with the inner tube and the outer sleeve, thereby increasing the maneuverability of the catheter, reducing the difficulty of superselection, improving the operability of the inner tube 1, and closing the end of the cavity between the inner tube body 12 and the outer sleeve body 22, so that blood will not overflow or bubbles will not appear at the end of the cavity, thereby avoiding affecting the surgical operation.

[0036] Working status Figure 7 As shown in the upper figure, the outer sleeve 2 and the inner tube 1 are combined (connected by a joint): after the outer sleeve 2 is inserted into the inner tube 1, the Luer cap of the joint part 32 is twisted so that the Luer cap with internal threads of the joint part 32 is connected to the male Luer connector of the catheter seat 21 to reach a locked state;

[0037] Lower figure: After being in place, the outer sleeve 2 moves along the inner tube 1 toward the distal end (joint separation): the Luer cap of the joint part 32 is reversely twisted to release the locking state between the joint part 32 and the catheter seat 21, and the outer sleeve moves along the inner tube toward the patient end.

[0038] In other embodiments, the locking design of the inner tube and the outer tube may also adopt a structure such as a rubber ring tension valve that can achieve locking and snap connection, and the structure only needs to be able to achieve locking of the inner tube and the outer tube and sealing of the middle cavity.

[0039] like Figure 6 The inner tube body 12 and the outer tube body 22 are both multi-layer structures, and the multi-layer structure includes an inner layer 41, a middle layer 42 and an outer layer 43, and the middle layer is a reinforcement layer.

[0040] The inner layer 41 is made of a smooth polymer material, such as PTFE (polytetrafluoroethylene), so that the inner wall of the outer sleeve body 22 has a smooth property, providing a smooth insertion experience.

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

[0042] The middle layer 42 is made of metal wire, which provides radial and axial support for the catheter and is fixed to the inner layer 41 by winding springs, weaving, etc. The metal wire can be made of nickel titanium, stainless steel, etc.

[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, thereby increasing the positioning of the catheter and adapting to the complex vascular circuit of the radial artery.

[0044] Furthermore, a heparin coating is attached to the inner wall of the outer tube body 22 and the proximal end of the outer wall of the inner tube body 12 to reduce the blood clotting caused by the gap between the catheters and avoid the formation of thrombus fragments in the gap.

[0045] Embodiment 2:

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

[0047] Wherein: the diameter range of the inner tube body 12 is: ID: 0.5-1.5mm OD: 1.0-2.0mm;

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

[0049] Preferably, the diameter of the inner tube body 12 is: ID: 1.06±0.1mm OD: 1.37±0.1mm;

[0050] The diameter of the outer sleeve body 22 is: 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 only 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 demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed and modified in any way without departing from the principles.

Claims

1. A radial artery angiography cannula, characterized in that: The invention comprises an inner tube (1) and an outer tube (2), wherein the inner tube (1) comprises an inner tube catheter seat (11) and an inner tube body (12), and the outer tube (2) comprises an outer tube catheter seat (21) and an outer tube body (22). The inner tube catheter seat (11) is provided with a joint portion (32), and the joint portion (32) can be connected with the outer tube catheter seat (21). When in use, the inner tube body (12) is inserted into the outer tube body (22), and the inner tube (1) and the outer tube (2) are combined together by utilizing the combination of the joint portion (32) and the outer tube catheter seat (21), thereby 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 an instrument adapter joint (31).

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

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

5. The radial artery angiography cannula according to claim 4, characterized in that: The inner layer (41) of the outer sleeve 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 a polymer material.

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

8. The radial artery angiography cannula according to any one of claims 5 to 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 changing the 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 body (12) is provided with a curved structure.

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

Images