Combining piece for supporting arteriovenous fistula blood vessel and supporting device

Abstract

The utility model discloses a connector for supporting arteriovenous fistula blood vessels and a supporting device. The arteriovenous fistula blood vessel is obliquely matched with the artery from the vein, an anastomosis angle smaller than 90 degrees is formed between the vein and the artery, the connector comprises a frame body of a hollow structure, the frame body is arranged at the anastomosis position of the vein and the artery in a sleeving mode, and the frame body comprises a first frame capable of being arranged on the artery in a sleeving mode and a second frame capable of being arranged on the vein in a sleeving mode. The first frame is connected with the second frame, the frame body further comprises a supporting part with a reinforcing structure, and the supporting part is connected between the first frame and the second frame and arranged on the opposite side of the anastomosis angle. The supporting strength of arteriovenous fistula blood vessels is enhanced through the arrangement of the combination piece, the circumferential stress of the arteriovenous fistula blood vessels can be well resisted, the negative influence of artery blood flow is reduced, and then the problem that the arteriovenous fistula blood vessels are narrow or blocked due to the existence of circumferential stress concentration areas is reliably solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, and more particularly to a support joint for supporting a fistula blood vessel, and to a support device comprising the support joint. BACKGROUND

[0002] In order to facilitate dialysis, a fistula is usually established in a patient's body to form a blood vessel channel; an opening at an end of a vein is connected to an opening on a circumferential side of an artery, and the two openings are anastomosed to form a fistula; the artery and the vein form a fistula blood vessel; blood flows directly from the artery to the vein through the fistula. Due to the blood flow impact of the artery on the vein, the vein is difficult to adapt to the large blood flow impact, which easily leads to remodeling and thickening of the vessel wall of the vein, and further leads to stenosis or occlusion of the fistula blood vessel, thereby reducing blood flow and affecting the dialysis effect. CONTENT

[0003] Therefore, the present application provides a support joint for supporting a fistula blood vessel, and a support device comprising the support joint, which solves the problem of stenosis or occlusion of the fistula blood vessel.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] A support joint for supporting a fistula blood vessel, the support joint comprising a frame body with a hollow structure, the frame body being capable of being sleeved at an anastomosis position of an artery and a vein of the fistula blood vessel, the vein being anastomosed to the artery obliquely, the vein and the artery at the anastomosis position having an anastomosis angle of less than 90°, the frame body comprising a first frame capable of being sleeved at the artery and a second frame capable of being sleeved at the vein, the first frame being connected to the second frame, the frame body further comprising a support portion having a reinforcing structure, the support portion being connected between the first frame and the second frame and being disposed at an opposite side of the anastomosis angle.

[0006] Optionally, the second frame has a first end connected to the first frame, the first end comprising a first portion and a second portion, the first portion being located at the side of the anastomosis angle, and the second portion being located at the opposite side of the anastomosis angle;

[0007] The first portion is connected to the first frame, and the second portion is connected to the first frame through the support portion;

[0008] The second frame is inclined in a direction away from the second portion.

[0009] Optionally, the support part comprises a first reinforcing member; the first reinforcing member comprises a plurality of connected support rods, and an included angle is formed between adjacent support rods;

[0010] When the coupling member is stressed, the included angle can change in angle, so that the first reinforcing member is deformed in extension and retraction to match the deformation of the coupling member under stress.

[0011] Optionally, the first reinforcing member is any one of an X-shaped connecting rod, a Z-shaped connecting rod, and a parallelogram connecting rod.

[0012] Optionally, the support part comprises an arched second reinforcing member having a protruding portion extending upward of the vein, the second reinforcing member being closer to the anastomosis than the first reinforcing member, and the second reinforcing member being connected to the first frame.

[0013] Optionally, the first frame comprises a first locking part and a second locking part circumferentially surrounding the artery.

[0014] The first locking part and the second locking part are selectively connected in closure, which is any one of a snap connection, an adhesive connection, a heat-shrinkable connection, and a wire binding connection.

[0015] Optionally, along the center line of the second frame, the second frame comprises a plurality of wave-shaped wave rods, and the wave rods are circumferentially closed along the second frame.

[0016] Along the center line of the second frame, the crests of all the wave rods are opposite to each other, and the troughs of all the wave rods are opposite to each other.

[0017] Among two adjacent wave rods, the crest of one wave rod is connected to the trough of the other wave rod through a connecting rod.

[0018] Optionally, the troughs form first arc-shaped chamfers, and the radius of the first arc-shaped chamfers is 0.05-0.15 mm.

[0019] and / or,

[0020] The crests form second arc-shaped chamfers, and the radius of the second arc-shaped chamfers is 0.1-0.2 mm.

[0021] and / or,

[0022] The included angle of the troughs is 60°-100°.

[0023] and / or,

[0024] The included angle of the crests is 60°-100°.

[0025] and / or,

[0026] The diameter D1 of the circumferentially closed wave-shaped rod is 3mm-4mm;

[0027] and / or,

[0028] The length L1 of the first frame along the extension direction of the artery is 6mm-10mm;

[0029] and / or,

[0030] The first frame can circumferentially surround the artery, and the diameter D2 of the circumferential surrounding is 3.5mm-4.5mm;

[0031] and / or,

[0032] The length L2 of the coupling member along the direction perpendicular to the artery is 7mm-12mm.

[0033] Also provided is a support device, comprising:

[0034] A coupling member for supporting an arteriovenous fistula blood vessel as described above;

[0035] A sleeve fixed to the coupling member and capable of being sleeved on a vein.

[0036] Optionally, the non-planar angle of the vein is limited to 10°-20° through cooperation of the coupling member and the sleeve;

[0037] and / or,

[0038] The anastomosis angle of the artery and the vein is limited to 55°-75° through cooperation of the coupling member and the sleeve.

[0039] In the coupling member for supporting an arteriovenous fistula blood vessel and the support device provided in the application, a reinforcing support part is arranged on the frame body; as described above, the support strength of the coupling member region can be increased, and thus the support strength of the arteriovenous fistula blood vessel is increased, the circumferential stress of the arteriovenous fistula blood vessel can be well resisted under the overall action of the coupling member, and the circumferential stress of the blood flow at the anastomosis position is further resisted through the reinforcing support of the support part at the anastomosis position, the negative influence of the arterial blood flow is reduced, and thus the problems of stenosis or occlusion of the arteriovenous fistula blood vessel due to the existence of the circumferential stress concentration area can be reliably avoided. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings.

[0041] Figure 1 This is a schematic diagram of the structure of the assembly in this application;

[0042] Figure 2 This is a schematic diagram of the structure of the assembly in this application;

[0043] Figure 3 for Figure 1 Enlarged partial views of the first locking part and the second locking part of the connecting parts;

[0044] Figure 4 This is a schematic diagram of the structure of the connector of this application disposed in an arteriovenous fistula vessel;

[0045] Figure 5 for Figure 4 Side view;

[0046] Figure 6 This is a schematic diagram of the structure of the connector of this application disposed in an arteriovenous fistula vessel;

[0047] Figure 7 for Figure 6 The main view;

[0048] Figure 8 for Figure 6 Side view;

[0049] Figure 9 This is a schematic diagram of the structure of the support device of this application disposed in an arteriovenous fistula vessel;

[0050] Figure 10 for Figure 9 The main view;

[0051] Figure 11 for Figure 9 Side view;

[0052] Figure 12 for Figure 9 A partial view;

[0053] Figure 13 This is a circumferential stress distribution diagram of the arteriovenous fistula vessel in this application when no support device is placed;

[0054] Figure 14 This is a schematic diagram of the structure of an arteriovenous fistula vessel;

[0055] Figure 15 This diagram illustrates the anastomosis plane, non-planar angle, and anastomosis angle of an arteriovenous fistula.

[0056] Figures 1-15 middle:

[0057] 1, frame body; 2, support part; 3, sleeve; 4, artery; 5, vein; 6, anastomosis point;

[0058] 11, first frame; 12, second frame;

[0059] 21, first reinforcing member; 22, second reinforcing member;

[0060] 41, first center line; 42, first point; 43, second point;

[0061] 51, second center line; 52, third point; 53, fourth point;

[0062] 111, first locking part; 112, second locking part;

[0063] 121, wave-shaped rod; 122, connecting rod;

[0064] 1111, clamping rod;

[0065] 1121, clamping ring;

[0066] 1211, wave trough; 1212, wave crest. DETAILED DESCRIPTION

[0067] The present application provides a combination for supporting arteriovenous fistula blood vessels, and further provides a support device comprising the combination for supporting arteriovenous fistula blood vessels.

[0068] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0069] For the convenience of illustration and understanding, the following embodiments can be described in the range of an exemplary combination for arteriovenous fistula prepared in a patient's body to facilitate hemodialysis. However, the embodiments of the present application are not limited to the specific scenarios described, and the embodiments can be applied to different clinical applications without departing from the overall scope of the present application; for example, in the vasculature or other organs, structures including the concepts described herein can be used to prevent and / or treat intimal hyperplasia or reconstruct in other artificial anatomic junctions, including end-to-side, end-to-end or side-to-side anastomosis. The present embodiment shows a vascular reconstruction passage of a venous end opening to an arterial side opening.

[0070] Please refer to the drawings Figures 1-15The application discloses a support joint for arteriovenous fistula blood vessels, which comprises a frame body 1 with a hollow structure, a support part 2 provided with a reinforcing structure and arranged on the frame body 1. The frame body 1 comprises a first frame 11 and a second frame 12 connected with each other, the first frame 11 can be sleeved on an artery 4, and the second frame 12 can be sleeved on a vein 5.

[0071] In the embodiment, the vein 5 is obliquely anastomosed to the artery 4 in the arteriovenous fistula blood vessels, and the vein 5 and the artery 4 at the anastomosis position have an anastomosis angle less than 90 degrees. The support joint is formed into the frame body 1 with a specific angle corresponding to the structure of the blood vessels.

[0072] In the embodiment, the support part 2 is connected between the first frame 11 and the second frame 12 and arranged on the opposite side of the anastomosis angle. In other embodiments, the support part 2 can be arranged at any circumferential position of the joint of the first frame and the second frame.

[0073] It is to be noted that the support joint for arteriovenous fistula blood vessels is referred to as the support joint hereinafter. The opening of the end of the vein 5 is connected to the opening of the circumferential side of the artery 4, and the two openings are anastomosed to form an arteriovenous fistula, so that the blood directly flows from the artery 4 to the vein 5 through the arteriovenous fistula. The artery 4 and the vein 5 are anastomosed to form the arteriovenous fistula blood vessels.

[0074] The support joint is supported on the arteriovenous fistula blood vessels, has a certain hardness, can resist the impact of high blood flow and shrink the anastomosis opening of the arteriovenous fistula, and the frame body 1 provides main mechanical support and stability for the anastomosis opening.

[0075] Since the blood directly flows from the artery 4 to the vein 5 through the arteriovenous fistula, the blood flow speed of the area of the vein 5 close to the arteriovenous fistula is relatively fast, and the impact of the blood flow is relatively large, so the area is formed into a circumferential stress concentration area, especially the position on the opposite side of the acute anastomosis angle of the vein 5 and the artery 4. As described above, the support part 2 supports and fixes the circumferential stress concentration area of the arteriovenous fistula blood vessels, the support part 2 increases the support strength of the circumferential stress concentration area, can well resist the circumferential stress of the arteriovenous fistula blood vessels, reduces the negative influence of the arterial blood flow, and further accurately and reliably avoids the problem that the arteriovenous fistula blood vessels are narrowed or occluded due to the existence of the circumferential stress concentration area.

[0076] Please refer to the accompanying drawings Figures 4-5 In some embodiments of the application, the second frame 12 has a first end connected with the first frame 11, and the first end comprises a first part and a second part. The first part is located on the side of the anastomosis angle, the second part is located on the opposite side of the anastomosis angle, the first part is connected with the first frame 11, and the second part is connected with the first frame 11 through the support part 2. The second frame 12 is inclined to the direction away from the second part.

[0077] As above, the shape of the arteriovenous fistula blood vessel is shaped by the combined structure of the first frame 11, the second frame 12, and the support part 2, so that the vein 5 is inclined relative to the artery 4, and the two form an anastomosis angle, and the support part 2 is arranged at a position opposite to the side of the frame body 1 forming the acute anastomosis angle; so that Figure 4 For example, the support part 2 is located on the right side of the extension direction of the artery 4, that is, at a position opposite to the side of the acute anastomosis angle.

[0078] Please refer to the accompanying Figure 13 , which is the circumferential stress distribution of each part of the arteriovenous fistula blood vessel obtained under the condition of maximum blood flow without arranging the support device of the embodiment; as shown in the figure, there is a maximum circumferential stress concentration in the region of the vein 5 close to the anastomosis angle of the arteriovenous fistula (i.e. the yellow region), forming a maximum circumferential stress concentration area.

[0079] The support part 2 is opposite to the maximum circumferential stress concentration area, and its accurate and reliable position increases the support strength of the maximum circumferential stress concentration area; while increasing the support strength, the support part 2 realizes the detailed arrangement of its distribution area, reduces the processing materials, and saves the cost.

[0080] Please refer to the accompanying Figures 4-5 , 11, in some embodiments of the present application, the support part 2 comprises a first reinforcing member 21; the first reinforcing member 21 comprises a plurality of connected support rods, and an included angle is formed between adjacent support rods. The above-mentioned included angle can change angle when the connecting member is stressed, so that the first reinforcing member 21 is deformed in extension and retraction to realize the stress deformation of the connecting member.

[0081] It should be noted that when the body changes posture or moves, the position of the arteriovenous fistula blood vessel will change, and then the connecting member which restrains and supports the arteriovenous fistula blood vessel is stressed.

[0082] Since the first reinforcing member 21 can be deformed in extension and retraction, it can exhibit a certain degree of compliance and flexibility; when the connecting member is stressed, the first reinforcing member 21 deforms in extension and retraction along the stress direction of the connecting member, thereby realizing the stress deformation of the connecting member, so that the connecting member can adapt to the position change of the arteriovenous fistula blood vessel and not too rigid to cause additional stress concentration on the arteriovenous fistula blood vessel.

[0083] The first reinforcing member 21 is composed of a plurality of support rods, and the included angle between adjacent support rods will change angle when the connecting member is stressed, thereby changing the support length of the first reinforcing member 21 along the stress direction of the connecting member. As above, the elastic extension and retraction deformation of the first reinforcing member 21 is realized, and the structure of the first reinforcing member 21 is simple, which is convenient for production and processing.

[0084] Please refer to the accompanying Figures 4-5, 11, in some embodiments of the present application, the first reinforcing member 21 is any one of an X-shaped link, a Z-shaped link, or a parallelogram link. The X-shaped link or the Z-shaped link or the parallelogram link is arranged along the second center line 51 of the vein 5.

[0085] It should be noted that the first reinforcing member 21 is composed of four support rods to be combined into an X-shaped link. Alternatively, the first reinforcing member 21 is composed of three support rods to be combined into a Z-shaped link. Alternatively, the first reinforcing member 21 is composed of four support rods to be combined into a parallelogram link. Of course, the first reinforcing member 21 is not limited to the X-shaped link, the Z-shaped link, or the parallelogram link, and can be replaced by other structures that can elastically deform. Here, it is not necessary to repeat the details.

[0086] It should be further noted that the metal sheet is laser cut to obtain the integrally formed first reinforcing member 21. Alternatively, the plurality of support rods are laser welded together to obtain the first reinforcing member 21.

[0087] As described above, the first reinforcing member 21 has a simple structure, consumes less material, and is easy to produce and process. While providing sufficient support strength, it can provide a sufficient degree of elastic deformation.

[0088] Please refer to the accompanying drawings Figures 4-5 , 11, in some embodiments of the present application, the support part 2 includes an arched second reinforcing member 22. Preferably, the second reinforcing member 22 is a w-shaped wave rod or an n-shaped rod, the second reinforcing member 22 has a protruding portion extending upwards of the vein 5, and the second reinforcing member 22 is arranged at a position opposite to the side of the acute anastomosis angle to provide additional support to the stress concentration area of the region through the support structure of the arch.

[0089] It should be noted that a strip structure can be laser cut from a metal sheet, and then the strip structure can be bent or folded to obtain the arched second reinforcing member.

[0090] Further, along the second center line 51 of the vein 5, the second reinforcing member 22 is arranged at a portion of the first reinforcing member 21 close to the arteriovenous fistula. Preferably, the first reinforcing member 21 is an X-shaped link, and the second reinforcing member 22 is an n-shaped rod. The n-shaped wave rod is arranged at the lower half of the X-shaped link.

[0091] As described above, the second reinforcing member 22 has a simple structure and is easy to produce and process. Moreover, the second reinforcing member 22 is closer to the arteriovenous fistula, and cooperates with the first reinforcing member 21 to accurately and reliably increase the support strength of the maximum circumferential stress concentration area, thereby reducing the negative impact of arterial blood flow and accurately and reliably avoiding the problem of stenosis or occlusion of the arteriovenous fistula due to the existence of the maximum circumferential stress concentration area.

[0092] Please refer to the attached drawings Figures 1-2 In some embodiments of the present application, the first frame 11 comprises a first locking portion 111 and a second locking portion 112 which circumferentially surround the artery 4. The first locking portion 111 and the second locking portion 112 are selectively connected in a closed manner, which can be any one of snap connection, adhesion, heat shrink connection, and wire binding.

[0093] It should be noted that the first frame 11 comprises a saddle-shaped fitting portion which fits the circumferential side of the artery 4, and the first locking portion 111 and the second locking portion 112 are respectively arranged on the two sides of the saddle-shaped fitting portion. The first locking portion 111 and the second locking portion 112 are connected in a closed manner by different means to fix the first frame 11 circumferentially on the outer periphery of the artery 4.

[0094] Figures 1-3 A self-locking mode is shown: the first locking portion 111 comprises a clamping rod 1111, and the second locking portion 112 comprises a clamping ring 1121, the clamping rod 1111 is clamped in the clamping ring 1121 to achieve the closed connection of the two; the clamping rod 1111 is unclamped in the clamping ring 1121 to achieve the disconnection of the two.

[0095] Please refer to the attached drawings Figure 3 Further, two recesses opposite to each other are formed on both sides of the area of the clamping rod 1111 away from the clamping ring 1121; an opening with material missing is formed on the area of the clamping ring 1121 close to the clamping rod 1111, and the clamping ring 1121 can be elastically deformed to make the opening larger or smaller. The clamping rod 1111 is inserted into the clamping ring 1121 through the opening, and the two ends of the clamping ring 1121 forming the opening are clamped into the two recesses of the clamping rod 1111 respectively to achieve the closed connection of the first locking portion 111 and the second locking portion 112; the clamping rod 1111 is pulled out of the clamping ring 1121 to achieve the disconnection of the first locking portion 111 and the second locking portion 112.

[0096] In use, the closed connection mode of the first locking portion 111 and the second locking portion 112 can be selected according to actual needs, which will not be described here.

[0097] Please refer to the attached drawings Figures 4-5 In some embodiments of the present application, along the center line of the second frame 12, the second frame 12 comprises a plurality of wave-shaped wave rods 121 which are closed along the circumference of the second frame 12. Along the center line of the second frame 12, the wave crests 1212 of all the wave rods 121 are opposite to the wave crests 1212, and the wave troughs 1211 are opposite to the wave troughs 1211. Among the two adjacent wave rods 121, the wave crest 1212 of one wave rod 121 is connected to the wave trough 1211 of the other wave rod 121 through a connecting rod 122.

[0098] The design of the wave-shaped rods 121 enables the second frame 12 to better adapt to the bending and tortuosity of the vein 5, reducing damage to the blood vessel wall; and the structure of the wave-shaped rods 121 makes the catheter more stable during insertion, reducing the possibility of sliding and displacement, thereby improving the safety of interventional therapy.

[0099] Further, all the wave crests 1212 of the wave-shaped rods 121 are opposite to the wave crests 1212, and all the wave troughs 1211 are opposite to the wave troughs 1211, which not only optimizes the arrangement of the wave-shaped rods 121, simplifies the manufacturing process, and makes the processing of the second frame 12 easier and more efficient, but also increases the flexibility of the second frame 12, enabling it to flexibly adapt to the bending and tortuosity of the vein 5, reducing damage to the blood vessel wall; at the same time, it can further enhance the compression and torsion resistance of the second frame 12, avoiding unnecessary deformation during use.

[0100] Further, a plurality of connecting rods 122 are arranged between adjacent two wave-shaped rods 121. As described above, the connecting rods 122 achieve fixed connection between adjacent two wave-shaped rods 121, so that the second frame 12 forms a stable whole, ensuring the support strength of the overall structure.

[0101] It should be further noted that the first frame 11 includes a fitting part that fits the circumferential side of the artery 4, and the fitting part is surrounded by a plurality of wave-shaped wave rods in the direction from the center of the arteriovenous fistula to the outer peripheral edge; along the circumference of the arteriovenous fistula, the wave-shaped rods are circumferentially closed. The ring density of the combination part includes the ring density of the first frame 11, and the ring density of the first frame 11, i.e. the ring density of the fitting part, is determined by the "distance between adjacent wave crests (or distance between adjacent wave troughs) in the circumferentially closed direction of the wave-shaped rods", and the "distance between adjacent wave-shaped rods in the direction from the center of the arteriovenous fistula to the outer peripheral edge". The ring density of the combination part includes the ring density of the second frame 12, and the ring density of the second frame 12 is determined by the "distance between adjacent wave crests 1212 (or distance between adjacent wave troughs 1211) in the circumferentially closed direction of the wave-shaped rods 121", and the "distance between adjacent wave-shaped rods 121 in the direction of the center line of the second frame 12".

[0102] A low ring density can provide better flexibility, but will lose support strength; a high ring density can provide better support strength, but will be more rigid. Therefore, during use, preoperative assessment is made considering factors such as the patient's age, blood flow, and vessel compliance, to select a combination part with an appropriate ring density.

[0103] Please refer to the accompanying drawings Figure 12In some embodiments of the present application, the wave trough 1211 forms a first arc-shaped chamfer, and the radius of the first arc-shaped chamfer is 0.05mm-0.15mm; for example, the radius of the first arc-shaped chamfer can be any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, etc.; preferably, the radius of the first arc-shaped chamfer is 0.08mm.

[0104] Please refer to the accompanying drawings Figure 12 In some embodiments, the wave peak 1212 forms a second arc-shaped chamfer, and the radius of the second arc-shaped chamfer is 0.1-0.2mm; for example, the radius of the second arc-shaped chamfer can be any one of 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc.; preferably, the radius of the second arc-shaped chamfer is 0.15mm.

[0105] Please refer to the accompanying drawings Figure 12 In some embodiments, the included angle of the wave trough 1211 is 60°-100°; for example, the included angle of the wave trough 1211 can be any one of 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, etc.

[0106] It should be noted that the included angle of the straight rod part on both sides of the wave trough 1211 in the wave-shaped rod 121 is the included angle of the wave trough 1211.

[0107] Please refer to the accompanying drawings Figure 12 In some embodiments, the included angle of the wave peak 1212 is 60°-100°; for example, the included angle of the wave peak 1212 can be any one of 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, etc.; preferably, the included angle of the wave peak 1212 is 80°.

[0108] It should be noted that the included angle of the straight rod part on both sides of the wave peak 1212 in the wave-shaped rod 121 is the included angle of the wave peak 1212.

[0109] Please refer to the accompanying drawings Figure 12 In some embodiments, the diameter D1 of the circumferential closure of the wave-shaped rod 121 is 3mm-4mm; for example, D1 can be any one of 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, etc.; preferably, D1 is 3.3mm.

[0110] Please refer to the accompanying drawings Figure 12In some embodiments, the length L1 of the first frame 11 along the extension direction of the artery 4 is 6-10 mm; for example, L1 can be any one of 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc.; preferably, L1 is 8 mm.

[0111] Please refer to the accompanying drawings Figure 12 In some embodiments, the first frame 11 can be circumferentially wrapped around the artery 4, and the circumferentially wrapped diameter D2 is 3.5-4.5 mm; for example, D2 can be any one of 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, etc.; preferably, D2 is 3.8 mm.

[0112] In some embodiments, the length L2 of the binding member along the direction perpendicular to the artery is 7-12 mm; for example, L2 can be any one of 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc.; preferably, L2 is 9 mm.

[0113] Through the above several parameter limitations, the ring density of the first frame 11 and the ring density of the second frame 12 can be accurately controlled, so that the binding member has sufficient support strength while having sufficient flexibility, can reliably shape the shape of the arteriovenous fistula blood vessel, and will not cause damage to the blood vessel wall.

[0114] Please refer to the accompanying drawings Figures 9-11 Based on the above-mentioned binding member for supporting the arteriovenous fistula blood vessel, the embodiments of the present application further provide a support device, which comprises the above-mentioned binding member for supporting the arteriovenous fistula blood vessel.

[0115] Since the support device has the above-mentioned binding member for supporting the arteriovenous fistula blood vessel, the beneficial effects of the support device brought by the binding member for supporting the arteriovenous fistula blood vessel are described above, and will not be repeated here.

[0116] In some embodiments of the present application, through the cooperation of the binding member and the sleeve 3, the non-planar angle of the vein 5 is limited to 10-20°.

[0117] Please refer to the accompanying drawings Figures 14-15Wherein, it is necessary to point out that the artery 4 has a first center line 41, the vein 5 has a second center line 51, and the intersection of the first center line 41 and the second center line 51 is the anastomosis point 6. Along the first center line, the first point 42 and the second point 43 are respectively formed at the positions 1cm away from the anastomosis point 6 in two ends; along the second center line 51, the third point 52 is formed at the position 1cm away from the anastomosis point 6 in the direction away from the arteriovenous fistula; the anastomosis plane is defined at the position 1cm away from the anastomosis point 6, that is, the plane in which the first point 42, the second point 43 and the third point 52 are located forms the anastomosis plane.

[0118] The non-planar angle of the vein 5 refers to the angle between the second center line 51 of the vein 5 and the anastomosis plane. Please refer to the attached Figure 15 Specifically, along the second center line 51, the fourth point 53 is formed at the position 3cm away from the anastomosis point 6 in the direction away from the arteriovenous fistula, and the position of the fourth point 53 is defined by considering the limit position of the vein 5 close to the skin, that is, the distal end of the cannula 3 or the position near the distal end, and the fourth point 53 is taken as the reference point of the non-planar angle; the line segment from the anastomosis point 6 to the fourth point 53 is the first line segment, and the angle between the first line segment and the anastomosis plane is defined as the non-planar angle of the vein 5.

[0119] Through the combined structure of the connecting piece and the cannula 3, the non-planar angle of the vein 5 is optimized to be limited within the range of 10°-20°; as mentioned above, the oscillatory shear stress of the blood on the arteriovenous fistula blood vessel can be well reduced, the negative impact of the arterial blood flow can be avoided, and thus the problem that the arteriovenous fistula blood vessel is narrowed or occluded due to the existence of the oscillatory shear stress concentration area can be reliably avoided.

[0120] In some embodiments, through the cooperation of the connecting piece and the cannula 3, the anastomosis angle of the artery 4 and the vein 5 is limited to 55°-75°.

[0121] Wherein, it is necessary to point out that the anastomosis angle of the artery 4 and the vein 5 refers to the angle between the first center line 41 of the artery 4 and the second center line 51 of the vein 5. Please refer to the attached Figure 15 Specifically, the line segment from the anastomosis point 6 to the first point 42 is the second line segment, and the line segment from the anastomosis point 6 to the third point 52 is the third line segment. The angle between the second line segment and the third line segment is the anastomosis angle of the artery 4 and the vein 5.

[0122] Through the combined structure of the connecting piece and the cannula 3, the anastomosis angle of the vein 5 and the artery 4 is optimized to be limited within the range of 55°-75°; as mentioned above, the oscillatory shear stress of the blood on the arteriovenous fistula blood vessel can be further reduced, the negative impact of the arterial blood flow can be avoided, and thus the problem that the arteriovenous fistula blood vessel is narrowed or occluded due to the existence of the oscillatory shear stress concentration area can be reliably avoided.

[0123] The present application reduces the problem of stenosis or occlusion of the arteriovenous fistula blood vessel from two aspects: on the one hand, a support part 2 is arranged on the frame body 1 of the connecting piece to increase the support strength and resist the hoop stress of the arteriovenous fistula blood vessel; on the other hand, the non-planar angle of the vein 5 and the anastomosis angle of the vein 5 and the artery 4 are constrained by the combined action of the connecting piece and the sleeve 3 to reduce the oscillatory shear stress of the blood on the arteriovenous fistula blood vessel.

[0124] The components, devices, and objects in the application are only illustrative examples and are not intended to require or imply that the application must be connected, arranged, configured in the manner shown in the drawings. As will be appreciated by those skilled in the art, the components, devices, and objects can be connected, arranged, configured in any manner. Words such as "include", "contain", "have", and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0125] It should also be noted that in the device of the present application, each component can be disassembled and / or reassembled. These disassembly and / or reassembly should be considered as equivalent solutions of the present application.

[0126] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0127] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, one skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

[0128] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coupling member for supporting a blood vessel of an arteriovenous fistula, characterized by, The combination includes a frame body (1) with a hollow structure, which can be sleeved on the anastomosis position of an arteriovenous fistula blood vessel, the vein (5) is obliquely anastomosed to the artery (4), the anastomosis position has an anastomosis angle of less than 90° between the vein (5) and the artery (4), the frame body (1) includes a first frame (11) capable of being sleeved on the artery (4) and a second frame (12) capable of being sleeved on the vein (5), the first frame (11) is connected with the second frame (12), and the frame body (1) further includes a support part (2) with a reinforcing structure, which is connected between the first frame (11) and the second frame (12) and is arranged on the opposite side of the anastomosis angle.

2. The junction for supporting a blood vessel of an arteriovenous fistula according to claim 1, characterized in that, The second frame (12) has a first end connected with the first frame (11), the first end includes a first part and a second part, the first part is located on the side of the anastomosis angle, and the second part is located on the opposite side of the anastomosis angle. The first part is connected to the first frame (11), and the second part is connected to the first frame (11) through the support part (2). Wherein, the second frame (12) is inclined to the direction away from the second part.

3. The junction for supporting a blood vessel of an arteriovenous fistula according to claim 1 or 2, characterized in that The support part (2) includes a first reinforcing member (21); the first reinforcing member (21) includes a plurality of connected support rods, and an included angle is formed between adjacent support rods; When the combination is stressed, the included angle can change in angle to make the first reinforcing member (21) stretch and deform to cooperate with the stress deformation of the combination.

4. The junction for supporting a blood vessel of an arteriovenous fistula according to claim 3, characterized in that The first reinforcing member (21) is any one of an X-shaped link, a Z-shaped link and a parallelogram link.

5. The junction for supporting a blood vessel of an arteriovenous fistula according to claim 3, wherein The support part (2) includes an arched second reinforcing member (22), the second reinforcing member (22) has a protruding part extending upwards of the vein (5), the second reinforcing member (22) is closer to the anastomosis position than the first reinforcing member (21), and the second reinforcing member (22) is connected to the first frame (11).

6. The junction for supporting a blood vessel of an arteriovenous fistula according to claim 1, wherein The first frame (11) includes a first locking part (111) and a second locking part (112) which circumferentially surround the artery (4); The first locking part (111) and the second locking part (112) are selectively closed and connected, and the closed connection is any one of buckle connection, adhesion, heat shrink connection and wire binding connection.

7. The junction for supporting a blood vessel of an arteriovenous fistula according to claim 1, wherein Along the center line of the second frame (12), the second frame (12) includes a plurality of wave-shaped wave rods (121), and the wave rods (121) are closed along the circumference of the second frame (12); Along the center line of the second frame (12), the crests of all the wave rods (121) are opposite to each other, and the troughs of all the wave rods (121) are opposite to each other; Among two adjacent wave rods (121), the crest of one wave rod (121) is connected with the trough of the other wave rod (121) through a connecting rod (122).

8. The combination for supporting an arteriovenous fistula blood vessel according to claim 7, wherein The wave trough forms a first arc-shaped chamfer, the radius of the first arc-shaped chamfer is 0.05mm-0.15mm; And / or, The wave peak forms a second arc-shaped chamfer, the radius of the second arc-shaped chamfer is 0.1-0.2mm; And / or, The included angle of the wave trough is 60°-100°; And / or, The included angle of the wave peak is 60°-100°; And / or, The diameter D1 of the circumferentially closed wave-shaped rod (121) is 3mm-4mm; And / or, The length L1 of the first frame (11) along the extension direction of the artery (4) is 6mm-10mm; And / or, The first frame (11) can circumferentially surround the artery (4), and the diameter D2 of the circumferential surrounding is 3.5mm-4.5mm; And / or, The length L2 of the coupling member in the direction perpendicular to the artery (4) is 7mm-12mm.

9. A support device, characterized by Comprise: The coupling member is the coupling member for supporting the arteriovenous fistula blood vessel according to any one of claims 1-8; The sleeve (3) is fixed to the coupling member and can be sleeved on the vein (5).

10. The support device according to claim 9, wherein By cooperation of the coupling member and the sleeve (3), the non-planar angle of the vein (5) is limited to 10°-20°; And / or, By cooperation of the coupling member and the sleeve (3), the anastomosis angle of the artery (4) and the vein (5) is limited to 55°-75°.

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