Renal artery stent implantation catheter

Abstract

The renal artery stent imbedding catheter comprises an outer catheter and an inner catheter, the inner catheter is nested in the outer catheter, the outer catheter comprises an outer catheter body and an outer catheter bending part which are integrally formed, the inner catheter comprises an inner catheter body and an inner catheter bending part which are integrally formed, and an opening of the outer catheter bending part and an opening of the inner catheter bending part have the same angle. The inner catheter is nested in the outer catheter, the outer catheter and the inner catheter are both provided with the bent portions, the angle can adapt to the angulation relation between renal arteries and aorta abdominalis of most patients, and after the inner catheter is matched with a guide wire to be selected into a target blood vessel position, the outer catheter can be used as a support. After the outer catheter reaches the target position, the inner catheter is withdrawn, and a channel of the outer catheter is used as a sacculus and stent conveying channel, so that damage to the abdominal aorta ratio and the renal artery in the sacculus and stent conveying process can be reduced, the occurrence rate of potential complications is reduced, and the technical success rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of renal artery stent placement technology, and in particular to a renal artery stent placement catheter. Background Technology

[0002] In interventional cardiovascular therapy, renal artery stenting has become an important method for treating hypertension and renal function impairment caused by renal artery stenosis (RAS). As a common cause of secondary hypertension, the high incidence and serious clinical consequences of renal artery stenosis, such as ischemic nephropathy, renal atrophy, refractory hypertension, and heart failure, underscore the importance of early intervention and treatment. When the renal artery lumen stenosis reaches or exceeds 50%, intervention measures are usually required to restore renal blood flow and prevent the condition from worsening.

[0003] With advancements in medical technology, renal artery stenting has become a primary treatment for renal artery stenosis due to its ability to significantly improve blood pressure levels and reduce cardiovascular events. However, the successful implementation of this procedure heavily relies on the precision and safety of the surgical instruments. Particularly during the insertion of interventional devices such as balloons and stents into the renal artery, it is crucial to overcome the complex anatomical relationship and angle between the renal artery and the abdominal aorta to avoid unnecessary damage to the vessel wall.

[0004] Currently, the long sheaths or ordinary catheters commonly used in clinical practice as protective delivery systems have significant limitations when delivering balloons and stents to the renal artery. These traditional instruments lack biomimetic designs tailored to the anatomy of the renal artery, making it difficult to effectively address the challenges posed by the angle between the renal artery and the abdominal aorta, thus increasing the difficulty of the surgical procedure and the risk of complications.

[0005] Therefore, we provide a renal artery stent placement catheter to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a renal artery stent placement catheter.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A renal artery stent placement catheter includes an outer catheter and an inner catheter, the inner catheter being nested within the outer catheter. The outer catheter includes an integrally formed outer tube body and an outer tube bend, and the inner catheter includes an integrally formed inner tube body and an inner tube bend. The opening angles of the outer tube bend and the inner tube bend are the same.

[0009] Preferably, the length of the inner tube bend is greater than the length of the outer tube bend.

[0010] Preferably, the length difference between the outer tube bend and the inner tube bend is L, where 1cm < L < 3cm.

[0011] Preferably, the angle between the opening of the outer tube bend and the vertical direction and the angle between the opening of the inner tube bend and the vertical direction are both α, wherein 65° < α < 75°.

[0012] Preferably, the outer surface of the end of the outer tube is provided with a connecting structure.

[0013] Preferably, the outer surface of the end of the outer tube is further provided with a first adjusting member.

[0014] Preferably, a second adjusting element is provided on the outer surface of the end of the inner tube.

[0015] Preferably, during use, the inner tube is connected to and installed with a Y valve via a connecting structure.

[0016] Preferably, the connection structure is an external thread.

[0017] This utility model has the following advantages:

[0018] 1. This invention features an inner catheter nested inside an outer catheter, with both the outer and inner catheters having curved sections. This angle can accommodate the angular relationship between the renal artery and abdominal aorta in most patients. After the inner catheter, in conjunction with the guidewire, is inserted into the target vessel, the outer catheter can be supported by the inner catheter. Once the outer catheter reaches the target position, the inner catheter is withdrawn. Furthermore, the channel of the outer catheter serves as a channel for balloon and stent delivery, which can reduce damage to the abdominal aorta and renal artery during balloon and stent delivery, reduce the incidence of potential complications, and improve the success rate of the technique.

[0019] 2. This utility model makes the length of the inner tube bend longer than the length of the outer tube bend, so that the inner tube bend can first enter the predetermined position, and then the opening of the outer tube bend reaches the predetermined position. After that, the inner catheter is withdrawn, and the outer catheter provides a channel for the balloon and stent to enter the predetermined position, thus preventing damage to the inner wall of the blood vessel during the delivery of the balloon and stent.

[0020] 3. This utility model improves the reliability of the connection by setting a connecting structure at the end of the outer tube body and connecting it to the Y valve. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the nested structure of the external and internal catheters of this utility model.

[0022] Figure 2 This is a schematic diagram of the external catheter structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the internal catheter structure of this utility model.

[0024] Figure 4 This is a schematic diagram of the combined structure of the outer conduit, inner conduit, and Y valve of this utility model.

[0025] In the figure, 100 is the outer conduit; 110 is the outer tube body; 120 is the outer tube bend; 200 is the inner conduit; 210 is the inner tube body; 220 is the inner tube bend; 300 is the connecting structure; 400 is the first adjusting component; 500 is the second adjusting component; and 600 is the Y valve. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 — Figure 4 The example shown.

[0029] A renal artery stent placement catheter includes an outer catheter 100 and an inner catheter 200, wherein the inner catheter 200 is nested within the outer catheter 100. The outer catheter 100 includes an integrally formed outer tube body 110 and an outer tube bend 120, and the inner catheter 200 includes an integrally formed inner tube body 210 and an inner tube bend 220. The opening angles of the outer tube bend 120 and the inner tube bend 220 are the same.

[0030] In this embodiment, the length of the inner tube bend 220 is greater than the length of the outer tube bend 120.

[0031] See Figures 1 to 4As shown, the inner catheter 200 is nested inside the outer catheter 100. Since the inner catheter 200 is longer than the outer catheter 100, after the guidewire reaches the target position and an effective passage is established, the inner catheter 200 is first guided to the predetermined position along the guidewire. Then, the inner catheter 200 is used as a guide and support to push the outer catheter 100 to the predetermined position. After that, the inner catheter 200 is withdrawn, leaving the outer catheter 100 as a channel. The outer catheter 100 is then used as a channel for balloons, stents, etc., thereby preventing damage to the inner walls of the abdominal aorta and renal arteries during insertion, reducing the incidence of potential complications, and improving the success rate of the operation.

[0032] In one embodiment, when the outer catheter 100 and the inner catheter 200 are combined, the combination can be completed simply by the inner catheter 200 being inserted into the outer catheter 100. In the initial state, the inner tube body 210 is inserted into the outer tube body 110, the inner tube bend 220 is inserted into the outer tube bend 120, and the inner tube bend 220 protrudes from the outlet of the outer tube bend 120, so that the inner catheter 200 can reach the predetermined position before the outer catheter 100 is pushed. In real time, the openings of the outer catheter 100 and the inner catheter 200 are flush, that is, the opening of the outer tube bend 120 is flush with the opening of the inner tube bend 220. After the outer catheter 100 reaches the predetermined position, the inner catheter 200 can be withdrawn, so that the balloon or stent can be placed into the predetermined position through the outer catheter 100.

[0033] In this embodiment, the external catheter 100 has an external tube bend 120 and the internal catheter 200 has an internal tube bend 220, both of which are bends to accommodate the angular relationship between the abdominal aorta and renal artery in most patients.

[0034] In this embodiment, since the external catheter 100 and the internal catheter 200 require a certain degree of deformation, the external catheter 100 and the internal catheter 200 are made of tough materials that can deform under the premise of meeting medical requirements.

[0035] The length difference between the outer tube bend 120 and the inner tube bend 220 is L, where 1cm < L < 3cm.

[0036] See Figure 1 As shown, the length of L can be set according to the patient's actual condition. Here, the length of L can be 1cm, 2cm, 3cm, etc. In this embodiment, the length of L is 2cm. Of course, other lengths can also be selected, and no specific limitation is made here.

[0037] The angle between the opening of the outer tube bend 120 and the vertical direction and the angle between the opening of the inner tube bend 220 and the vertical direction are both α, where 65° < α < 75°.

[0038] See Figures 1 to 4As shown, in order to adapt the openings of the outer tube bend 120 and the inner tube bend 220 to the angle between the renal artery and the abdominal aorta, the openings of the outer tube bend 120 and the inner tube bend 220 need to be at a certain angle. Specifically, the angle α can be 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, etc. In this embodiment, the angle α is 70°, but other angles can be selected according to actual needs.

[0039] The outer surface of the end of the outer tube 110 is provided with a connecting structure 300; the connecting structure 300 is an external thread.

[0040] See Figure 2 As shown, in order to connect the outer conduit 100 to other components, specifically to connect the Y valve 600, a connecting structure 300 needs to be provided at the end of the outer tube 110. In use, the inner tube 210 is connected to and installed with the Y valve 600 through the connecting structure 300.

[0041] For details, please refer to Figure 4 As shown, the connection structure 300 has an external thread on the outer surface of the end of the outer tube 110, and the Y valve 600 has an internal thread that matches the external thread on the outer surface of the end of the outer tube 110. That is, the outer conduit 100 is connected to the Y valve 600 by the connection of the internal thread and the external thread, making the connection between the two more reliable.

[0042] The outer surface of the end of the outer tube 110 is provided with a first adjusting member 400; the outer surface of the end of the inner tube 210 is provided with a second adjusting member 500.

[0043] See Figure 2 and Figure 3 In this embodiment, the first adjusting member 400 and the second adjusting member 500 can be elliptical protruding handles, mainly used for adjusting their positions. That is, the position of the outer conduit 100 can be adjusted by the first adjusting member 400, and the position of the inner conduit 200 can be adjusted by the second adjusting member 500.

[0044] The working process of this utility model is as follows: First, the femoral artery is punctured, then a femoral artery sheath is placed. Next, a guidewire and an angiography catheter are introduced through the sheath. The outer catheter 100 is connected to the Y valve 600 via the connecting structure 300. Then, the inner catheter 200 is inserted into the outer catheter 100 through the Y valve 600 to achieve a combination. The outer catheter 100 and the inner catheter 200 are nested together to form a combined catheter. The guidewire is positioned according to the renal artery opening marked on the combined catheter, and then the direction is adjusted so that the opening of the inner catheter 200 faces the renal artery opening. The guidewire is inserted into the renal artery, passing through the lesion segment, and left in the renal artery branch. The combined catheter is then inserted into the renal artery along the guidewire. The inner catheter 200 is positioned at the renal artery opening. Next, the guidewire is withdrawn, and the contrast agent is manually pushed through the inner catheter 200 for confirmation. Advance the external catheter 100 until its opening is flush with the opening of the internal catheter 200, i.e., the opening of the external catheter bend 120 is flush with the opening of the internal catheter bend 220. This allows the external catheter 100 to reach the predetermined position. Guided by the internal catheter bend 220, the external catheter bend 120 reaches the predetermined position. Next, withdraw the internal catheter 200 and connect the Y valve 600 through the external catheter 100 to mark the lesion location for angiography. Then withdraw the Y valve 600 and insert a balloon to pre-dilate the lesion through the tubing formed by the external catheter 100. After the lesion is dilated, insert and release a stent through the external catheter 100. Connect the angiography tube through the external catheter 100 to confirm the stent location and the patency of the lesion. After achieving the therapeutic effect, withdraw the external catheter 100 and guidewire and close the femoral artery puncture site.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A renal artery stent placement catheter, characterized in that, It includes an outer conduit (100) and an inner conduit (200), the inner conduit (200) being nested within the outer conduit (100). The outer conduit (100) includes an integrally formed outer tube body (110) and an outer tube bend (120), and the inner conduit (200) includes an integrally formed inner tube body (210) and an inner tube bend (220). The opening angles of the outer tube bend (120) and the inner tube bend (220) are the same.

2. The renal artery stent placement catheter according to claim 1, characterized in that: The length of the inner tube bend (220) is greater than the length of the outer tube bend (120).

3. The renal artery stent placement catheter according to claim 2, characterized in that: The length difference between the outer tube bend (120) and the inner tube bend (220) is L, where 1cm < L < 3cm.

4. The renal artery stent placement catheter according to claim 1, characterized in that: The angle between the opening of the outer tube bend (120) and the vertical direction and the angle between the opening of the inner tube bend (220) and the vertical direction are both α, where 65° < α < 75°.

5. The renal artery stent placement catheter according to claim 1, characterized in that: The outer surface of the end of the outer tube (110) is provided with a connecting structure (300).

6. The renal artery stent placement catheter according to claim 1, characterized in that: The outer surface of the end of the outer tube (110) is also provided with a first adjusting member (400).

7. The renal artery stent placement catheter according to claim 1, characterized in that: The outer surface of the end of the inner tube (210) is provided with a second adjusting member (500).

8. A renal artery stent placement catheter according to claim 5, characterized in that: In use, the inner tube body (210) is connected to and installed with a Y valve (600) via a connecting structure (300).

9. A renal artery stent placement catheter according to claim 5 or 8, characterized in that: The connection structure (300) is externally threaded.

Images