Extravascular stent

Abstract

The invention discloses an extravascular stent, and relates to the technical field of medical instruments. The extravascular stent comprises a first sleeve joint piece, a second sleeve joint piece and a third sleeve joint piece, the first sleeving piece is suitable for being arranged on the periphery of a vein in a sleeving mode, a plurality of deformation grooves are formed in the first sleeving piece, the area between every two adjacent deformation grooves is hollowed out, and the deformation grooves are used for enabling the first sleeving piece to adapt to the diameter change of the vein; the second sleeving piece is connected with one side of the second end of the first sleeving piece, and the second sleeving piece is suitable for being connected to the periphery of the artery blood vessel on the upstream side in a sleeving mode; the third sleeving piece is connected with the other side of the second end of the first sleeving piece, and the third sleeving piece is suitable for being connected to the periphery of the artery blood vessel on the downstream side in a sleeving mode. According to the extravascular stent provided by the invention, the structural design is improved, the mounting convenience of the extravascular stent is improved, the operation time is shortened, the adaptability of the extravascular stent to the diameter change of a vein is improved, the material cost is saved, and the treatment cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an extravascular stent. Background Art

[0002] An autologous arteriovenous fistula is a common way to construct a vascular access for patients with end-stage renal disease during hemodialysis treatment. The vascular access is a way to continuously draw the patient's blood out of the body and then return it to the body.

[0003] When forming an arteriovenous fistula, usually the vein is directly attached to the artery, which will cause the blood flow disorder at the arteriovenous anastomosis, or the blood pressure on the venous side and the blood circulation condition of the blood flow change sharply. In this way, excessive stress will be generated in the blood vessel wall in the arteriovenous anastomosis and the vein on its downstream side, resulting in pathological intimal hyperplasia, and sometimes causing blockage, stenosis, etc. In order to solve the above problems, the prior art has proposed a solution of setting an extravascular stent on the vascular anastomosis to relieve the excessive blood flow change of the vein in the initial stage of anastomosis formation.

[0004] The existing Y-shaped extravascular stent has an elongated portion positioned around the native blood vessel and a tubular portion protruding from the side of the elongated portion and positioned around the transplanted blood vessel. The elongated portion is provided with incisions along the longitudinal direction of the stent. However, as the arterial blood flow continuously enters the vein, the diameter of the vein will become larger, but the diameter of this extravascular stent is fixed and cannot adapt to the change of the vein diameter, resulting in the occurrence of venous hypertension and its chain reaction; moreover, the amount of material used for this extravascular stent is large, the cost is high, and the treatment cost for patients is expensive. Summary of the Invention

[0005] The main purpose of the present invention is to provide an extravascular stent, aiming to improve the adaptability of the extravascular stent to the change of the diameter of the venous blood vessel, save the material cost, and reduce the treatment cost for patients.

[0006] To achieve the above object, the present invention provides an extravascular stent for supporting at the arteriovenous anastomosis. The extravascular stent includes: A first sleeve member adapted to be sleeved on the outer periphery of the venous blood vessel. The first sleeve member has a first end away from the arterial blood vessel and a second end close to the arterial blood vessel. A plurality of deformation grooves extending along its axial direction are provided on the first sleeve member, and the area between adjacent two deformation grooves is provided with a hollow. The deformation grooves are used to enable the first sleeve member to adapt to the change of the diameter of the venous blood vessel; A second sleeve member connected to one side of the second end of the first sleeve member. The second sleeve member is adapted to be sleeved on the outer periphery of the upstream arterial blood vessel; and A third sleeve member connected to the other side of the second end of the first sleeve member. The third sleeve member is adapted to be sleeved on the outer periphery of the downstream arterial blood vessel.

[0007] Optionally, both the second socket and the third socket are provided with openings for sleeving them around the outer periphery of the blood vessel to form a "C"-shaped structure.

[0008] Optionally, at least one of the second socket and the third socket is provided with a hollowed-out structure.

[0009] Optionally, the diameter of the first socket is less than or equal to the diameters of the second socket and the third socket, and the diameters of the second socket and the third socket are the same.

[0010] Optionally, the diameter of the first socket is greater than the diameters of the second socket and the third socket, and the diameters of the second socket and the third socket are the same.

[0011] Optionally, the extracorporeal blood vessel stent further includes a connecting member, and the second socket and the third socket are connected by the connecting member.

[0012] Optionally, the connecting member includes a first connecting rod, a second connecting rod and a fixing member. The first connecting rod is connected to the second socket, the second connecting rod is connected to the third socket, and the first connecting rod and the second connecting rod are connected by the fixing member.

[0013] Optionally, the first connecting rod and the second socket are integrally formed, and the second connecting rod and the third socket are integrally formed.

[0014] Optionally, the first socket, the second socket and the third socket are integrally formed.

[0015] Optionally, the extracorporeal blood vessel stent is made by integrally laser cutting a pipe and then performing a stretching and shaping treatment.

[0016] In the technical solution of the present invention, the extracorporeal blood vessel stent includes a first socket member, a second socket member, and a third socket member; the first socket member is adapted to be sleeved on the outer periphery of a venous blood vessel. The first socket member has a first end away from the arterial blood vessel and a second end close to the arterial blood vessel. A plurality of deformation grooves extending along its axial direction are provided on the first socket member, and the area between adjacent two deformation grooves is provided with a hollow structure. The deformation grooves are used to enable the first socket member to adapt to the change in the diameter of the venous blood vessel; the second socket member is connected to one side of the second end of the first socket member, and the second socket member is adapted to be sleeved on the outer periphery of the upstream arterial blood vessel; the third socket member is connected to the other side of the second end of the first socket member, and the third socket member is adapted to be sleeved on the outer periphery of the downstream arterial blood vessel. It can be understood that the present invention provides an extracorporeal blood vessel stent, which improves the structural design. By setting the deformation grooves and the hollow structure, the adaptability of the extracorporeal blood vessel stent to the change in the diameter of the venous blood vessel is effectively improved, and the material usage is less, saving the material cost and reducing the treatment cost of patients. In addition, the extracorporeal blood vessel stent of the present invention is provided with an opening, which effectively improves the convenience of installing the extracorporeal blood vessel stent, reduces the operation time, and the structure of the extracorporeal blood vessel stent is stable and reliable, ensuring the stability of the support at the arteriovenous anastomosis site. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 It is a schematic diagram of the application of an embodiment of the extracorporeal blood vessel stent of the present invention; Figure 2 It is a schematic structural diagram of an embodiment of the extracorporeal blood vessel stent of the present invention; Figure 3 It is a processing flowchart of an embodiment of the extracorporeal blood vessel stent of the present invention; Figure 4 It is a processing flowchart of another embodiment of the extracorporeal blood vessel stent of the present invention; Figure 5 It is a front view of another embodiment of the extracorporeal blood vessel stent of the present invention; Figure 6 It is a schematic structural diagram of another embodiment of the extracorporeal blood vessel stent of the present invention.

[0019] Explanation of the reference numerals in the drawings: 10. First socket piece; 20. Second socket piece; 30. Third socket piece; 40. Connecting piece; 10a. Deformation groove; 10b. First hollow part; 100. Vein; 200. Artery; 20a. Opening; 30a. Second hollow part; 41. First connecting rod; 42. Second connecting rod; 43. Fixing piece.

[0020] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In the description of the present invention, it should also 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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.

[0024] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. The meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution that both A and B are satisfied. The technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0025] An autogenous arteriovenous fistula is a common way to construct a vascular access for patients with end-stage renal disease during hemodialysis treatment. The vascular access is a way to continuously draw the patient's blood out of the body and then return it to the body.

[0026] When forming an arteriovenous fistula, usually the vein is directly attached to the artery, which will cause blood flow disorders at the arteriovenous anastomosis, or a sharp change in the blood pressure and blood circulation conditions on the venous side. In this way, excessive stress will be generated in the blood vessel wall at the arteriovenous anastomosis and the vein on its downstream side, leading to pathological intimal hyperplasia and sometimes causing blockage, stenosis, etc. To solve the above problems, the prior art has proposed a solution of setting an extracorporeal stent at the vascular anastomosis to relieve the excessive blood flow change of the vein at the initial stage of anastomosis formation.

[0027] The existing Y-shaped extracorporeal stent has an elongated portion positioned around the native vessel and a tubular portion protruding from the side of the elongated portion and positioned around the graft vessel. The elongated portion is provided with incisions along the longitudinal direction of the stent. However, as the arterial blood flow continuously enters the vein, the diameter of the vein will become larger, but the diameter of this extracorporeal stent is fixed and cannot adapt to the change in the diameter of the vein, resulting in venous hypertension and its chain reactions; moreover, the material consumption of this extracorporeal stent is large, the cost is high, and the treatment cost for patients is extremely high.

[0028] In addition, the structure of the existing extracorporeal stent is complex, the installation is inconvenient, and the operation difficulty is great.

[0029] In view of this, the present invention proposes an extracorporeal stent, aiming to solve the above problems existing in the prior art.

[0030] Refer to Figure 1 and Figure 2 , in an embodiment of the present invention, the extracorporeal stent is used to support at the arteriovenous anastomosis. The extracorporeal stent includes a first socket member 10, a second socket member 20, and a third socket member 30; the first socket member 10 is adapted to be sleeved on the outer periphery of the vein 100 blood vessel. The first socket member 10 has a first end away from the artery 200 blood vessel and a second end close to the artery 200 blood vessel. A plurality of deformation grooves 10a extending along its axial direction are provided on the first socket member 10. The area between adjacent two deformation grooves 10a is provided with a hollow-out setting, that is, a plurality of first hollow-out portions 10b are provided on the first socket member 10. The deformation grooves 10a are used to make the first socket member 10 adapt to the change in the diameter of the vein 100 blood vessel, and the first hollow-out portions 10b can further improve the adaptability of the first socket member 10; the second socket member 20 is connected to one side of the second end of the first socket member 10, and the second socket member 20 is adapted to be sleeved on the outer periphery of the upstream artery 200 blood vessel; the third socket member 30 is connected to the other side of the second end of the first socket member 10, and the third socket member 30 is adapted to be sleeved on the outer periphery of the downstream artery 200 blood vessel.

[0031] In this embodiment, the materials of the first socket part 10, the second socket part 20, and the third socket part 30 can all be selected as poly (lactic-co-glycolic acid) (PLGA). This material can maintain a support time ranging from several months to 2 years by adjusting the polymer ratio (such as the ratio of lactic acid to glycolic acid in the poly (lactic-co-glycolic acid)). Of course, other materials can also be used, which are not limited herein.

[0032] The first socket part 10, the second socket part 20, and the third socket part 30 can be of an integrally formed structure. Specifically, the extracorporeal blood vessel stent can be made by integrally laser cutting a pipe and then performing a stretching and shaping treatment. Of course, the first socket part 10, the second socket part 20, and the third socket part 30 can also be a split structure assembled by means such as welding or bonding, which is not limited herein.

[0033] In this embodiment, the notch of the deformation groove 10a is located at the end of the first socket part 10 away from the artery 200 blood vessel, so that the end has better adaptability. The number of the deformation grooves 10a is at least one, and as shown in the figure, there are 4. The 4 deformation grooves 10a can be evenly arranged at intervals along the circumferential direction of the first socket part 10, and the specific length and width are not limited.

[0034] It can be understood that the present invention provides an extracorporeal blood vessel stent, which improves the structural design. By providing the deformation groove 10a and the hollow structure, the adaptability of the extracorporeal blood vessel stent to the diameter change of the vein 100 blood vessel is effectively improved, and the material usage is less, the weight is lighter, the material cost is saved, and the treatment cost of the patient is reduced.

[0035] To further reduce the overall weight of the extracorporeal blood vessel stent, further save the material usage, and reduce the treatment cost, refer to Figures 2 to 4 , in some embodiments, at least one of the second socket part 20 and the third socket part 30 is provided with a hollow structure. As shown in Figure 2 , the third socket part 30 is provided with a plurality of second hollow parts 30a.

[0036] In this embodiment, to enable the extracorporeal blood vessel stent to better adapt to the diameter change of the artery 200 blood vessel, similar deformation grooves 10a or strip-shaped grooves identical to the deformation grooves 10a can also be provided at the ends of the second socket part 20 and the third socket part 30.

[0037] To facilitate the installation of the extracorporeal blood vessel stent for arteriovenous anastomosis and reduce the operation time, mainly refer to Figure 2 , in one embodiment, both the second socket part 20 and the third socket part 30 can be provided with openings 20a for sleeving them on the outer periphery of the blood vessel to form a "C" - shaped structure.

[0038] The extravascular stent of the present invention is provided with an opening 20a, which effectively improves the convenience of installing the extravascular stent, reduces the operation time, and the structure of the extravascular stent is stable and reliable, ensuring the stability of supporting the arteriovenous anastomosis.

[0039] During the operation, the operator can first sleeved the first socket member 10 on the vein 100 vessel (at this time, the vein 100 has a break), make an incision on the artery 200 vessel, then suture one end of the vein 100 vessel to the incision of the artery 200 vessel, and then sleeved the second socket member 20 and the third socket member 30 on the upstream side and the downstream side peripheries of the artery 200 vessel respectively, so that the installation of the entire extravascular stent is completed.

[0040] In one embodiment, as Figure 3 shown, the diameter of the first socket member 10 is less than or equal to the diameters of the second socket member 20 and the third socket member 30, and the diameters of the second socket member 20 and the third socket member 30 are the same. In this way, it can meet the support requirements of the arteriovenous anastomosis part in the case where the diameter of the vein 100 vessel is less than or equal to the diameter of the artery 200 vessel.

[0041] In another embodiment, as Figure 4 shown, the diameter of the first socket member 10 is greater than the diameters of the second socket member 20 and the third socket member 30, and the diameters of the second socket member 20 and the third socket member 30 are the same. In this way, it can meet the support requirements of the arteriovenous anastomosis part in the case where the diameter of the vein 100 vessel is greater than the diameter of the artery 200 vessel.

[0042] To further improve the support stability of the extravascular stent, referring to Figure 5 and Figure 6 , in yet another embodiment, the extravascular stent may further include a connecting member 40, and the second socket member 20 and the third socket member 30 are connected by the connecting member 40.

[0043] For the convenience of processing and assembling each component, in this embodiment, the connecting member 40 may include a first connecting rod 41, a second connecting rod 42 and a fixing member 43. The first connecting rod 41 is connected to the second socket member 20, the second connecting rod 42 is connected to the third socket member 30, and the first connecting rod 41 and the second connecting rod 42 are connected by the fixing member 43. Among them, the fixing member 43 can adopt a circular sleeve structure, and both ends of the fixing member 43 are sleeved on the first connecting rod 41 and the second connecting rod 42 respectively and can be fixed by means of threaded connection or welding to connect the first connecting rod 41 and the second connecting rod 42 together.

[0044] In this embodiment, the first connecting rod 41 can be integrally formed with the second socket 20, and the second connecting rod 42 can be integrally formed with the third socket 30. Such a setting can further improve the overall reliability of the extracorporeal blood vessel stent, and at the same time reduce the number of components, making the assembly more convenient.

[0045] Of course, in some other embodiments, the first connecting rod 41 and the second socket 20 can also be independent components, and the two are connected by welding, bonding or other means; similarly, the second connecting rod 42 and the third socket 30 can also be independent components, and the two are connected by welding, bonding or other means.

[0046] The above are only the optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An extracorporeal stent for supporting at an arteriovenous anastomosis, characterized in that, The extracorporeal stent includes: A first sleeve member adapted to be sleeved around the outer periphery of a venous blood vessel. The first sleeve member has a first end away from the arterial blood vessel and a second end close to the arterial blood vessel. A plurality of deformation grooves extending along its axial direction are provided on the first sleeve member, and the area between adjacent two of the deformation grooves is provided with a hollow. The deformation grooves are used to enable the first sleeve member to adapt to the change in the diameter of the venous blood vessel; A second sleeve member connected to one side of the second end of the first sleeve member, and the second sleeve member is adapted to be sleeved around the outer periphery of the upstream arterial blood vessel; and A third sleeve member connected to the other side of the second end of the first sleeve member, and the third sleeve member is adapted to be sleeved around the outer periphery of the downstream arterial blood vessel.

2. The extracorporeal stent according to claim 1, characterized in that, Both the second sleeve member and the third sleeve member are provided with openings for sleeving them around the outer periphery of the blood vessel to form a "C" - shaped structure.

3. The extracorporeal stent according to claim 1 or 2, characterized in that, At least one of the second sleeve member and the third sleeve member is provided with a hollow.

4. The extracorporeal stent according to claim 1, characterized in that, The diameter of the first sleeve member is less than or equal to the diameters of the second sleeve member and the third sleeve member, and the diameters of the second sleeve member and the third sleeve member are the same.

5. The extracorporeal stent according to claim 1, characterized in that, The diameter of the first sleeve member is greater than the diameters of the second sleeve member and the third sleeve member, and the diameters of the second sleeve member and the third sleeve member are the same.

6. The extracorporeal stent according to claim 1, characterized in that, The extracorporeal stent further includes a connecting member, and the second sleeve member and the third sleeve member are connected by the connecting member.

7. The extracorporeal stent according to claim 6, characterized in that, The connecting member includes a first connecting rod, a second connecting rod and a fixing member. The first connecting rod is connected to the second sleeve member, the second connecting rod is connected to the third sleeve member, and the first connecting rod and the second connecting rod are connected by the fixing member.

8. The extracorporeal stent according to claim 7, characterized in that, The first connecting rod and the second sleeve member are integrally formed, and the second connecting rod and the third sleeve member are integrally formed.

9. The extracorporeal stent according to claim 1, characterized in that, The first sleeve member, the second sleeve member and the third sleeve member are integrally formed.

10. The extracorporeal stent according to claim 9, characterized in that, The extracorporeal stent is made by integrally laser - cutting a pipe and then performing a stretching and shaping treatment.

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