Extravascular stent

Abstract

The invention discloses an extravascular stent, and belongs to the technical field of intravascular stents.The extravascular stent comprises a plurality of vascular clamps, at least one vascular clamp is suitable for being clamped on the periphery of a first blood vessel, and at least one vascular clamp is suitable for being clamped on the periphery of a second blood vessel; the shaping hose is connected among the plurality of vascular clamps, and the shaping hose can be randomly bent in space and can be kept in a bent shape; when the multiple vascular clamps are clamped on the peripheries of the first blood vessel and the second blood vessel, the included angle between the first blood vessel and the second blood vessel is bent and shaped along with bending and shaping of the shaping hose. After the external vascular stent is installed, an operator can adjust the included angle between the first blood vessel and the second blood vessel in place, the shaping hose is shaped in a bent shape, and at the moment, the first blood vessel and the second blood vessel are shaped by the shaping hose in an angle-adjusted shape; therefore, angle adjustment and space shaping of the first blood vessel and the second blood vessel within the 360-degree range can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vascular stents, and particularly to an extracorporeal vascular stent. Background Art

[0002] Patients in the end stage of kidney disease generally need to undergo frequent hemodialysis to remove toxins from the blood and maintain a proper body balance. To effectively remove toxins, the blood must flow through a hemodialysis machine at a relatively large blood flow rate. This relatively large blood flow rate is optimally achieved by creating a permanent vascular access site that includes an arteriovenous (AV) anastomosis; among them, the vein is attached to the artery to form a large-flow shunt or fistula, which is usually called an AV fistula. Due to the excellent patency of the AV fistula, low complication rate, lower cost of the healthcare system, and low risk of patient death, it is widely used for hemodialysis vascular access.

[0003] When forming an AV fistula, usually the vein is directly attached to the artery, which may cause blood flow disorders at the arteriovenous anastomosis, or a sharp change in blood pressure and blood circulation conditions on the venous side. This will generate excessive stress within the vascular wall of the arteriovenous anastomosis and the downstream vein, leading to pathological intimal thickening and sometimes causing blockage, stenosis, etc.; to solve the above problems, an extracorporeal vascular stent is proposed to be provided on the vascular anastomosis to alleviate the excessive blood flow change in the vein at the initial stage of anastomosis formation. However, the existing extracorporeal vascular stent has a complex structure, is inconvenient to install, and cannot be properly installed and adjusted according to the conditions of the artery and vein. Summary of the Invention

[0004] In view of this, the present invention provides an extracorporeal vascular stent to solve the problems of the existing extracorporeal vascular stent having a complex structure, being inconvenient to install, and being unable to be properly installed and adjusted according to the conditions of the artery and vein.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows: An extracorporeal vascular stent, comprising: a plurality of vascular clips, at least one vascular clip being adapted to clamp around the outer periphery of a first blood vessel, and at least one vascular clip being adapted to clamp around the outer periphery of a second blood vessel; a shaping flexible tube, connected between the plurality of vascular clips, the shaping flexible tube being capable of arbitrarily bending in space and maintaining the bent shape; when the plurality of vascular clips clamp around the outer peripheries of the first blood vessel and the second blood vessel, the included angle between the first blood vessel and the second blood vessel is bent and shaped along with the bending and shaping of the shaping flexible tube.

[0006] Further, there are a plurality of the shaping flexible tubes, and the plurality of shaping flexible tubes are all connected between the plurality of vascular clips.

[0007] Further, the shaping hose is a metal shaping hose.

[0008] Further, the vascular clip includes a C-shaped clip ring having a first opening and circumferentially arranged, and a hose clip ring arranged on the outer periphery of the C-shaped clip ring; the C-shaped clip ring has elasticity itself, and the C-shaped clip ring is adapted to clamp a first blood vessel or a second blood vessel located within the C-shaped clip ring through its own elastic deformation; the shaping hose is clamped and fixed within the hose clip ring of the vascular clip.

[0009] Further, the hose clip ring includes an opening ring having a second opening and circumferentially arranged, and the opening ring is adapted to clamp the shaping hose located within the opening ring through its own elastic deformation.

[0010] Further, the hose clip ring is slidably connected to the outer periphery of the C-shaped clip ring along the circumferential direction of the C-shaped clip ring.

[0011] Further, a groove is provided on the outer peripheral wall of the C-shaped clip ring, the groove is arranged along the circumferential direction of the C-shaped clip ring, and the hose clip ring is slidably connected to the groove.

[0012] Further, the cross-section of the groove in the longitudinal direction of the C-shaped clip ring is an inverted T shape; the hose clip ring includes a slidable base and an opening ring integrally connected; the slidable base is slidably connected to the groove, and the cross-section of the slidable base in the longitudinal direction of the hose clip ring is the same as the cross-section of the groove in the longitudinal direction of the C-shaped clip ring; the second opening is provided on the opening ring, and the opening ring is a circumferentially arranged and elastic arc-shaped structure.

[0013] Further, a plurality of hose clip rings are provided on the outer periphery of the C-shaped clip ring, the number of shaping hoses is the same as the number of hose clip rings on the C-shaped clip ring, and each shaping hose is clamped and fixed inside one of the hose clip rings; the hose clip rings slide along the circumferential direction of the C-shaped clip ring to adjust the position distribution of the plurality of shaping hoses on the outer peripheries of the first blood vessel and the second blood vessel.

[0014] Further, there are at least four vascular clips, at least two of the vascular clips are adapted to clamp on the outer periphery of the first blood vessel, and at least two vascular clips are adapted to clamp on the outer periphery of the second blood vessel.

[0015] Further, the C-shaped clip ring is made of stainless steel material.

[0016] The technical solution of the present invention has the following advantages: When installing this extracorporeal blood vessel stent, first connect the shaping hose in advance between multiple blood vessel clamps, and then clamp the multiple blood vessel clamps on the outer peripheries of the first blood vessel and the second blood vessel respectively, that is, the installation of the extracorporeal blood vessel stent on the outer peripheries of the first blood vessel and the second blood vessel is completed, and the installation is convenient and fast; Since the shaping hose can be bent arbitrarily in space and maintain the bent shape, after the installation of the extracorporeal blood vessel stent is completed, the operator can manually adjust the included angle between the first blood vessel and the second blood vessel to a suitable angle. After the included angle between the first blood vessel and the second blood vessel is adjusted in place, the shaping hose is fixed in the bent shape, and at this time, the first blood vessel and the second blood vessel are also fixed in the shape after the angle adjustment by the shaping hose, so that the angle adjustment and spatial shaping within the 360° range of the first blood vessel and the second blood vessel can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic three-dimensional structure diagram when the extracorporeal blood vessel stent in the embodiment of the present invention supports on the outer periphery of an arteriovenous fistula. The arrow direction in the figure is the blood flow direction in the first blood vessel; Figure 2 It is a front view when the extracorporeal blood vessel stent in the embodiment of the present invention supports on the outer periphery of an arteriovenous fistula; Figure 3 is Figure 2 a cross-sectional view; Figure 4 It is a schematic three-dimensional structure diagram of the blood vessel clamp in the embodiment of the present invention; Figure 5 It is a left view of the blood vessel clamp in the embodiment of the present invention; Figure 6 is Figure 5 a cross-sectional view of the A-A plane in Figure 7 It is a front view of the blood vessel clamp in the embodiment of the present invention; Figure 8 is Figure 7 a cross-sectional view of the B-B plane in

[0019] Description of the reference numerals: 100, the first blood vessel; 200, the second blood vessel; 1, C-shaped clamping ring; 101, the first opening; 102, the groove; 103, the first clamping cavity; 2, hose clamping ring; 201, the second opening; 202, the second clamping cavity; 21, sliding base; 22, opening ring; 3, shaping hose. Detailed implementation manners

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] As Figures 1 - 8 shown, an extravascular stent is mainly used for external support of blood vessels, especially for external support at the anastomosis of arterial and venous blood vessels. The extravascular stent includes a plurality of vascular clips and a shaping hose 3 connected between the plurality of vascular clips; the vascular clip includes a C-shaped clip ring 1 and a hose clip ring 2 provided on the outer periphery of the C-shaped clip ring 1.

[0023] As Figure 1 、 Figure 2 and Figure 3 shown, in some embodiments, there are four vascular clips. Two of the vascular clips are clamped on the outer periphery of the first blood vessel 100 adjacent to the anastomosis of the first blood vessel 100 and the second blood vessel 200, and the other two vascular clips are clamped on the outer periphery of the second blood vessel 200 adjacent to the anastomosis of the first blood vessel 100 and the second blood vessel 200. The shaping hose 3 is connected between the four vascular clips, and the shaping hose 3 can be bent arbitrarily in space and maintain the bent shape. Among them, the first blood vessel 100 is usually an arterial blood vessel, and the second blood vessel 200 is usually a venous blood vessel. An incision is provided on the wall of the first blood vessel 100, and the opening at one end of the second blood vessel 200 is sutured to the first blood vessel 100 and covers the incision on the first blood vessel 100, so that the blood flow upstream of the first blood vessel 100 can flow into the second blood vessel 200, and the part of the first blood vessel 100 clamped by two vascular clips is located upstream of the second blood vessel 200. Figure 1 The direction of the arrow in is the blood flow direction in the first blood vessel.

[0024] In other alternative embodiments, the number of vascular clips is not limited to four, and the number of vascular clips can also be two, three or more. When the number of vascular clips is two, one vascular clip is clamped around the outer periphery of the first blood vessel 100, and the other vascular clip is clamped around the outer periphery of the second blood vessel 200. At this time, the vascular clip needs to have a relatively long length in its own axial direction so that the vascular clip can well restrain and fix the first blood vessel 100 or the second blood vessel 200. When the number of vascular clips is six, three of the vascular clips are clamped around the outer periphery of the first blood vessel 100, and the other three vascular clips are clamped around the outer periphery of the second blood vessel 200. The three vascular clips on the first blood vessel 100 are arranged at equal intervals, and the three vascular clips on the second blood vessel 200 are also arranged at equal intervals, so that the six vascular clips can better restrain and fix the first blood vessel 100 and the second blood vessel 200.

[0025] As Figure 1 , Figure 2 and Figure 3 shown, in some embodiments, three hose clips 2 are arranged on the outer periphery of the C-shaped clip ring 1. There are three shaped hoses 3, and the number of shaped hoses 3 is the same as the number of hose clips 2 on the C-shaped clip ring 1. The three shaped hoses 3 are all connected between the four vascular clips, and the length directions of the three shaped hoses 3 are all arranged along the blood flow direction from the first blood vessel 100 to the second blood vessel 200. The three shaped hoses 3 are respectively clamped and fixed in the three hose clips 2 on the outer periphery of the C-shaped clip ring 1. The included angle between the first blood vessel 100 and the second blood vessel 200 is bent and shaped along with the bending and shaping of the three shaped hoses 3. In some alternative embodiments, the number of hose clips 2 on the outer periphery of the C-shaped clip ring 1 can also be one, two or four or more; correspondingly, the number of shaped hoses 3 can also be one, two or four or more.

[0026] In other alternative embodiments, the shaped hose 3 can also be fixed on the C-shaped clip ring 1 by other structures other than the hose clip 2. For example, a spring clip with a pair of semi-circular clamping jaws is arranged on the C-shaped clip ring 1. When the spring clip is pressed and opened, the shaped hose 3 can be inserted into the pair of semi-circular clamping jaws of the spring clip; when the spring clip is released, the shaped hose 3 is clamped and fixed by the pair of semi-circular clamping jaws.

[0027] In some embodiments, the shaped hose 3 is specifically a metal shaped hose, and the metal shaped hose has good bending and shaping ability and can shape the first blood vessel 100 and the second blood vessel 200 in the bent shape.

[0028] When installing this extracorporeal blood vessel stent, first connect three shaping flexible hoses 3 in advance between four blood vessel clamps, and then clamp the four blood vessel clamps on the outer perimeters of the first blood vessel 100 and the second blood vessel 200 respectively, thus completing the installation of the extracorporeal blood vessel stent on the outer perimeters of the first blood vessel 100 and the second blood vessel 200. The installation is convenient and fast. Since the shaping flexible hose 3 can be bent arbitrarily in space and maintain the bent shape, after the installation of the extracorporeal blood vessel stent is completed, the operator can manually adjust the included angle between the first blood vessel 100 and the second blood vessel 200 to an appropriate angle. After the included angle between the first blood vessel 100 and the second blood vessel 200 is adjusted in place, the shaping flexible hose 3 is fixed in the bent shape. At this time, the first blood vessel 100 and the second blood vessel 200 are also fixed in the form after the angle adjustment by the shaping flexible hose 3, so that the angle adjustment and spatial shaping of the first blood vessel 100 and the second blood vessel 200 within 360° can be realized.

[0029] As Figure 4 , Figure 5 and Figure 6 shown, the C-shaped clamping ring 1 is made of stainless steel material, and the C-shaped clamping ring 1 itself has elasticity. The C-shaped clamping ring 1 is suitable for clamping the first blood vessel 100 or the second blood vessel 200 located inside the C-shaped clamping ring 1 through its own elastic deformation. In some embodiments, the C-shaped clamping ring 1 includes a first arc-shaped bending main body having a first opening 101 and circumferentially arranged. The gap between the two ends of the first arc-shaped bending main body is the first opening 101. The blood vessel can be inserted into the C-shaped clamping ring 1 from the first opening 101 of the C-shaped clamping ring 1 after being pinched flat. When the C-shaped clamping ring 1 is sleeved on the outer perimeter of the blood vessel, the existence of the first opening 101 allows the C-shaped clamping ring 1 to be radially outwardly expanded by the blood vessel. At this time, the first clamping cavity 103 inside the C-shaped clamping ring 1 increases, and the C-shaped clamping ring 1 has a tendency to radially inwardly contract under the elastic action of restoring its original shape, so as to clamp the blood vessel inside the first clamping cavity 103.

[0030] As Figure 4 , Figure 5 and Figure 6As shown, in some embodiments, three hose clamp rings 2 are slidably connected to the outer periphery of the C-shaped clamp ring 1 along the circumferential direction of the C-shaped clamp ring 1. A groove 102 is provided on the outer peripheral wall of the C-shaped clamp ring 1. The groove 102 is arranged along the circumferential direction of the C-shaped clamp ring 1, and the hose clamp ring 2 is slidably connected to the groove 102. The three hose clamp rings 2 can slide within the groove 102 of the C-shaped clamp ring 1, allowing manual adjustment of the positions of the multiple hose clamp rings 2, and further adjusting the position distribution of the multiple shaped hoses 3 on the first blood vessel 100 and the second blood vessel 200; enabling the multiple shaped hoses 3 to better shape the current shapes of the first blood vessel 100 and the second blood vessel 200. In some alternative embodiments, a guide rail that protrudes outward and extends along the circumferential direction of the C-shaped clamp ring 1 can also be provided on the outer peripheral wall of the C-shaped clamp ring 1, and a chute that cooperates with the guide rail is provided within the hose clamp ring 2. The hose clamp ring 2 is slidably connected to the outer peripheral wall of the C-shaped clamp ring 1 through the cooperation of the chute and the guide rail.

[0031] As Figure 4 , Figure 7 and Figure 8 shown, in some embodiments, the cross-section of the groove 102 in the longitudinal direction of the C-shaped clamp ring 1 is an inverted T shape. The hose clamp ring 2 includes an integrally connected sliding base 21 and an open ring 22; the sliding base 21 is slidably connected to the groove 102, and the cross-section of the sliding base 21 in the longitudinal direction of the hose clamp ring 2 is the same as the cross-section of the groove 102 in the longitudinal direction of the C-shaped clamp ring 1. With such a setting, on the basis of realizing the reliable connection between the hose clamp ring 2 and the C-shaped clamp ring 1, smooth sliding of the hose clamp ring 2 on the outer peripheral wall of the C-shaped clamp ring 1 can be achieved, facilitating adjustment of the position distribution of the hose clamp ring 2 and the shaped hose 3.

[0032] As Figure 4 , Figure 7 and Figure 8 shown, in some embodiments, the hose clamp ring 2 is also made of stainless steel material. The open ring 22 of the hose clamp ring 2 has elasticity, and the open ring 22 is adapted to clamp the shaped hose 3 located within the open ring 22 through its own elastic deformation. The open ring 22 includes a second arc-shaped bending main body that has a second opening 201 and is circumferentially arranged. The gap between the two ends of the second arc-shaped bending main body is the second opening 201. When the open ring 22 is sleeved on the outer periphery of the shaped hose 3, the existence of the second opening 201 allows the open ring 22 to be radially expanded outward by the shaped hose 3. At this time, the second clamping cavity 202 within the open ring 22 increases, and the open ring 22 has a tendency to radially contract inward under the elastic action of restoring its original shape, thereby clamping the shaped hose 3 within the second clamping cavity 202.

[0033] During the operation of forming an arteriovenous fistula, a venous blood vessel is attached to an arterial blood vessel, and the openings of the two are sutured to form an arteriovenous fistula tube; a plurality of C-shaped clamping rings 1 of the external blood vessel stent are respectively clamped on the arterial blood vessel and the venous blood vessel, and the installation of the external blood vessel stent is completed (the shaping hose 3 and the hose clamping ring 2 have been assembled in advance); since the hose clamping ring 2 can slide in the groove 102 of the C-shaped clamping ring 1, the positions of the plurality of hose clamping rings 2 can be manually adjusted, and then the position distribution of the plurality of shaping hoses 3 on the arterial blood vessel and the venous blood vessel can be adjusted. At the same time. Since the shaping hose 3 can be bent arbitrarily in space, the operator can manually adjust the included angle between the arterial blood vessel and the venous blood vessel to an appropriate angle and maintain the adjusted shape, so as to realize the arbitrary adjustment of the included angle between the arterial blood vessel and the venous blood vessel.

[0034] In summary, for the external blood vessel stent provided by the present invention, since the shaping hose 3 can be bent arbitrarily in space and maintain the bent shape, after the external blood vessel stent is installed on the outer peripheries of the first blood vessel 100 and the second blood vessel 200, the operator can manually adjust the included angle between the first blood vessel 100 and the second blood vessel 200 to an appropriate angle. After the included angle between the first blood vessel 100 and the second blood vessel 200 is adjusted in place, the shaping hose 3 is fixed in the bent shape. At this time, the first blood vessel 100 and the second blood vessel 200 are also fixed in the form after the angle adjustment by the shaping hose 3, so that the angle adjustment and spatial shaping within 360° of the first blood vessel 100 and the second blood vessel 200 can be realized. In addition, since the hose clamping ring 2 can slide in the groove 102 of the C-shaped clamping ring 1, the positions of the plurality of hose clamping rings 2 can be manually adjusted, and then the position distribution of the plurality of shaping hoses 3 on the first blood vessel 100 and the second blood vessel 200 can be adjusted, so that the plurality of shaping hoses 3 can better fix the current shapes of the first blood vessel 100 and the second blood vessel 200.

[0035] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. An extravascular stent, characterized in that: include: A plurality of vascular clamps, at least one of which is suitable for clamping the periphery of a first blood vessel (100), and at least one of which is suitable for clamping the periphery of a second blood vessel (200); A shaping hose (3) connected between the plurality of vascular clamps, wherein the shaping hose (3) can be bent arbitrarily in space and maintain the bent shape; When the plurality of vascular clamps are clamped on the periphery of the first blood vessel (100) and the second blood vessel (200), the angle between the first blood vessel (100) and the second blood vessel (200) is bent and shaped as the shaping hose (3) is bent and shaped.

2. The extravascular stent according to claim 1, characterized in that: There are a plurality of shaping hoses (3), and the plurality of shaping hoses (3) are all connected between a plurality of vascular clamps.

3. The extravascular stent according to claim 1, characterized in that: The shaping hose (3) is a metal shaping hose.

4. The extravascular stent according to any one of claims 1 to 3, characterized in that: The blood vessel clamp comprises a C-shaped clamp ring (1) having a first opening (101) and being arranged circumferentially, and a hose clamp ring (2) arranged on the periphery of the C-shaped clamp ring (1); the C-shaped clamp ring (1) itself is elastic, and the C-shaped clamp ring (1) is suitable for clamping a first blood vessel (100) or a second blood vessel (200) located in the C-shaped clamp ring (1) through its own elastic deformation; the shaping hose (3) is clamped and fixed in the hose clamp ring (2) of the blood vessel clamp.

5. The extravascular stent according to claim 4, characterized in that: The hose clamp ring (2) comprises an open ring (22) having a second opening (201) and arranged circumferentially, and the open ring (22) is suitable for clamping the shaped hose (3) located in the open ring (22) through its own elastic deformation.

6. The extravascular stent according to claim 5, characterized in that: The hose clamp ring (2) is slidably connected to the outer circumference of the C-type clamp ring (1) along the circumferential direction of the C-type clamp ring (1).

7. The extravascular stent according to claim 6, characterized in that: A groove (102) is provided on the outer peripheral wall of the C-shaped clamp ring (1), and the groove (102) is arranged along the circumferential direction of the C-shaped clamp ring (1). The hose clamp ring (2) is slidably connected to the groove (102).

8. The extravascular stent according to claim 7, characterized in that: The cross section of the groove (102) in the longitudinal direction of the C-type clamp ring (1) is an inverted T-shape; the hose clamp ring (2) comprises a sliding base (21) and an open ring (22) which are integrally connected; the sliding base (21) is slidably connected to the groove (102), and the cross section of the sliding base (21) in the longitudinal direction of the hose clamp ring (2) is the same as the cross section of the groove (102) in the longitudinal direction of the C-type clamp ring (1).

9. The extravascular stent according to claim 7, characterized in that: The hose clamp rings (2) are arranged in plurality on the periphery of the C-type clamp ring (1); the number of the shaping hoses (3) is the same as the number of the hose clamp rings (2) on the C-type clamp ring (1); each shaping hose (3) is clamped and fixed inside one of the hose clamp rings (2); the hose clamp ring (2) slides along the circumference of the C-type clamp ring (1) to adjust the position distribution of the plurality of shaping hoses (3) on the periphery of the first blood vessel (100) and the second blood vessel (200).

10. The extravascular stent according to claim 1, characterized in that: There are at least four vascular clamps, at least two of which are suitable for clamping the periphery of the first blood vessel (100), and at least two of which are suitable for clamping the periphery of the second blood vessel (200).

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