Artificial blood vessel assembly and system

Abstract

The invention relates to the technical field of medical instruments, and discloses an artificial blood vessel assembly which comprises a first support and a second support, the first support comprises a first butt joint piece, the second support comprises a second butt joint piece, and the first butt joint piece and the second butt joint piece are matched in a sleeved mode. Thus. The first support is provided with the first butt joint piece, the second support is provided with the second butt joint piece, the first butt joint piece and the second butt joint piece are matched in a sleeved mode to achieve connection of the first support and the second support, and the connection difficulty of the first support and the second support is reduced; the connecting position of the first support and the second support is located on the inner side of the first support, so that the possibility of blood flow leakage detection caused by insufficient tightness of the connecting position of the first support and the second support is reduced.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to an artificial blood vessel component and system. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] For areas where two sections of artificial stents need to be connected, especially for blood vessels with smaller diameters in the branch blood vessel area, doctors are usually required to suture and connect the branch stents. On the one hand, the suturing operation is cumbersome and takes up a lot of time, causing discomfort to the patient. On the other hand, in the suture area of ​​the stent, there are many suture holes, which is prone to bleeding. Summary of the invention

[0004] The purpose of the present application is to at least alleviate the problem of bleeding easily formed in the suture area of ​​the stent due to the large number of suture holes. This purpose is achieved through the following technical solutions:

[0005] The invention provides an artificial blood vessel assembly, comprising a first support and a second support, wherein the first support comprises a first docking piece, the second support comprises a second docking piece, and the first docking piece and the second docking piece are sleeved and matched.

[0006] Optionally, the artificial blood vessel assembly includes a separated state and a combined state. In the separated state, the first docking piece is tilted relative to the axis of the first bracket. In the combined state, the first docking piece is inserted into the second docking piece and fits against the inner wall of the first bracket.

[0007] Optionally, the first docking member further includes a plurality of mounting rods, and the second docking member includes a plurality of collars, and in a combined state, the collars are suitable for being sleeved on the mounting rods.

[0008] Optionally, at least two adjacent mounting rods are connected, and the collar is at least sleeved on the two connected mounting rods.

[0009] Optionally, the artificial blood vessel assembly further includes an inner concave piece, which is sleeved on the first bracket, and the inner concave piece is arranged corresponding to the position where the first docking piece and the second docking piece are sleeved.

[0010] Optionally, the second bracket includes a sealing segment and a second main body segment connected to each other, the second docking piece is connected to the sealing segment or the second main body segment, and the sealing segment is located radially inward of the second docking piece.

[0011] Optionally, the second bracket further includes a first restraining film and a second restraining film, the first restraining film is coated on the sealing section, the second restraining film is coated on the second main section, the first restraining film and the second restraining film are spaced apart, and the second docking piece is located between the first restraining film and the second restraining film.

[0012] Optionally, the first support further includes a first support ring, and the second support includes at least two intersecting spiral units, and in a combined state, the first support ring is located in a gap between the two spiral units.

[0013] Optionally, the two spiral units form a limiting groove at the intersection position, the notch of the limiting groove is arranged toward the outside, and the first support ring is at least partially located in the limiting groove.

[0014] Compared with the prior art, the artificial blood vessel assembly provided by the present invention has the following beneficial effects:

[0015] The present invention provides a first docking piece on the first bracket and a second docking piece on the second bracket. The first docking piece and the second docking piece are sleeved and matched to achieve the connection between the first bracket and the second bracket, thereby reducing the difficulty of connecting the first bracket and the second bracket. Furthermore, the first docking piece is located on the inner side of the first bracket, so that the connection position of the first bracket and the second bracket is located on the inner side of the first bracket, thereby reducing the possibility of blood flow leakage due to insufficient sealing at the connection between the first bracket and the second bracket.

[0016] The present invention also provides a stent system, comprising the artificial blood vessel assembly as described above and a conveying device, wherein the conveying device is used to convey the first stent or the second stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 It is a schematic structural diagram of the artificial blood vessel assembly in the first embodiment of the present invention in a separated state;

[0019] Figure 2 It is a schematic structural diagram of the artificial blood vessel assembly in the first embodiment of the present invention in a connected state;

[0020] Figure 3 is a schematic structural diagram of a first docking member in Embodiment 1 of the present invention;

[0021] Figure 4 It is an exploded schematic diagram of the inner concave member and the first bracket in the first embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of a second bracket in Embodiment 2 of the present invention;

[0023] Figure 6It is a structural schematic diagram of the second embodiment of the present invention, in which the second docking member is in a released state, and the sealing section and the second main body section are in a compressed state;

[0024] Figure 7 This is a structural schematic diagram of the first bracket and the second bracket in the second embodiment of the present invention in a joined state;

[0025] Figure 8 is a schematic structural diagram of a first bracket in Embodiment 2 of the present invention;

[0026] Fig. 9 It is a schematic diagram of the structure of the spiral skeleton in the second embodiment of the present invention;

[0027] Fig.10 A schematic diagram of the radial cross-sectional structure of the second bracket in the second embodiment of the present invention;

[0028] Fig.11 It is a partial enlarged schematic diagram of the structure of the second bracket in the second embodiment of the present invention;

[0029] Fig.12 is a schematic structural diagram of a support system in Embodiment 3 of the present invention;

[0030] Fig.13 It is a schematic structural diagram of the first restraining film, the second restraining film, the sealing section and the second main body section in the third embodiment of the present invention;

[0031] Fig.14 It is a structural schematic diagram of the second docking member in the third embodiment of the present invention in a released state, and the sealing section and the second main body section in a compressed state;

[0032] Fig.15 is a schematic structural diagram of the first binding film in the third embodiment of the present invention;

[0033] Fig.16 Schematic diagram of the structure of the push rod in the third embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] It should also be noted that the directional terms such as left, right, up, and down in this embodiment are merely relative concepts or are based on the normal use status of the product and should not be considered as restrictive.

[0037] In the field of interventional medicine, the end of the stent where the blood flows in is usually defined as the proximal end, and the end where the blood flows out is usually defined as the distal end. For long objects, the direction parallel to the direction of its length extension is defined as the "axial direction". For objects with a circular cross-section, the direction around its axial direction is defined as the "circumferential direction", and the line along the circumference is the "circumferential line". The end where the blood flows in to the artificial blood vessel is defined as the proximal end, and the end where the blood flows out is defined as the distal end.

[0038] Embodiment 1

[0039] An embodiment of the present invention provides an artificial blood vessel assembly 100, such as Figure 1 , Figure 2 As shown, it includes a first bracket 110 and a second bracket 120. The first bracket 110 is provided with a first docking piece 111, and the first docking piece 111 is located on the inner side of the first bracket 110. The second bracket 120 is provided with a second docking piece 121. The first docking piece 111 and the second docking piece 121 are sleeved and matched.

[0040] The first stent 110 is a tubular structure, and a blood flow channel is formed on the inner side of the first stent 110. The first stent 110 includes a first main section 112 and a first docking piece 111, the first docking piece 111 is located on the inner side of the first main section 112, the first docking piece 111 is connected to the inner wall of the first main section 112, and the first docking piece 111 is at least partially spaced from the inner wall of the first main section 112. The first main section 112 includes a coating, and the coating forms a tubular structure. The first docking piece 111 is sutured or bonded to the coating. The material of the coating includes any one of PTEF, PET or PU. The coating can be made by electrospinning, knitting or weaving.

[0041] The second bracket 120 is a tubular structure, and the second bracket 120 includes a second main body section 122 and a second docking piece 121, the second docking piece 121 is connected to the axial end of the second main body section 122, and the second docking piece 121 at least partially extends toward a side away from the second main body section 122. The second main body section 122 includes a coating, and the coating is connected to form a tubular structure. The second docking piece 121 is sutured or bonded to the coating. The material of the coating includes any one of PTEF, PET or PU. The coating can be made by electrospinning, knitting or weaving.

[0042] The second docking member 121 is sleeved and matched with the first docking member 111. It should be noted that the sleeved and matched means that the second docking member 121 can be sleeved on the first docking member 111 to achieve the connection between the first bracket 110 and the second bracket 120, and the second docking member 121 can also be detached from the first docking member 111 to achieve the disassembly and separation of the first bracket 110 and the second bracket 120. For example, in one embodiment, the first docking member 111 includes a hook, and the second docking member 121 includes a connecting ring, the hook hooks the connecting ring to achieve the connection between the first docking member 111 and the second docking member 121, and the hook is detached from the connecting ring to achieve the disassembly and separation of the first docking member 111 and the second docking member 121.

[0043] The axial spacing distance between the proximal end of the first docking member 111 and the proximal end of the first main body section 112 is greater than the length L of the second docking member 121. The axial spacing distance between the distal end of the first docking member 111 and the distal end of the first main body section 112 is greater than the length L of the second docking member 121. Specifically, the axial spacing between the proximal end of the first docking member 111 and the proximal end of the first main body section 112 is between 10mm-17mm. Specifically, it can be 10mm, 11mm, 12mm, 15mm or 17mm. The axial spacing distance between the distal end of the first docking member 111 and the distal end of the first main body section 112 is between 50mm-150mm, specifically, it can be: 50mm, 70mm, 90mm, 100mm or 150mm. The proximal end of the first docking member 111 is spaced apart from the proximal end of the first main body section 112 , and the distal end of the first docking member 111 is spaced apart from the distal end of the first main body section 112 , so that the connection position between the first docking member 111 and the second docking member 121 is located on the inner side of the first main body section 112 .

[0044] During the implantation of the artificial blood vessel assembly 100, the proximal end of the first stent 110 is connected to the main blood vessel, and the proximal end of the second stent 120 is extended into the second stent 120 so that the second docking piece 121 is sleeved on the first docking piece 111, and then the second stent 120 is driven to move toward the distal end so that the second docking piece 121 is sleeved on the first docking piece 111.

[0045] Therefore, by providing a first docking piece 111 on the first bracket 110 and a second docking piece 121 on the second bracket 120, the first docking piece 111 and the second docking piece 121 are sleeved and matched to realize the connection between the first bracket 110 and the second bracket 120, thereby reducing the difficulty of connecting the first bracket 110 and the second bracket 120. Furthermore, by the first docking piece 111 being located on the inner side of the first bracket 110, the connection position of the first bracket 110 and the second bracket 120 is located on the inner side of the first bracket 110, thereby reducing the possibility of blood flow leakage due to insufficient sealing at the connection between the first bracket 110 and the second bracket 120.

[0046] like Figure 1 and Figure 2 As shown, the artificial blood vessel assembly 100 includes a separated state and a combined state. In the separated state, the first docking piece 111 is tilted relative to the axis of the first main body section 112. In the combined state, the first docking piece 111 is sleeved on the second docking piece 121, and the first docking piece 111 is in contact with the inner wall of the first main body section 112.

[0047] The artificial blood vessel assembly 100 includes a separated state and a combined state. It should be noted that the separated state refers to a state in which the first support 110 and the second support 120 are separated and are not connected. The combined state refers to a state in which the first support 110 and the second support 120 are connected, and at this time, the second docking member 121 is sleeved on the first docking member 111.

[0048] like Figure 1 As shown, in the separated state, the first docking member 111 is arranged obliquely relative to the axis of the first main body section 112. The first docking member 111 is inclined toward the direction close to the central axis l1 of the first main body section 112, and the angle a between the first docking member 111 and the axis of the first main body section 112 is between 15-70°. Specifically, the angle a between the first docking member 111 and the axis of the first main body section 112 can be 15°, 30°, 45°, 60° or 70°.

[0049] During the process of connecting the first bracket 110 and the second bracket 120, the second bracket 120 is inserted into the first bracket 110, and the first docking piece 111 is inclined relative to the axis of the first main body section 112. The second docking piece 121 is located on the inner side of the first bracket 110 and corresponds to the position of the first docking piece 111. The second bracket 120 is pushed in a direction away from the first docking piece 111, so that the second docking piece 121 moves in the direction of the distal side, so that the second docking piece 121 is sleeved on the first docking piece 111, and then the second bracket 120 is completely released, and the outer wall of the second bracket 120 is in contact with the inner wall of the first bracket 110, and the second docking piece 121 pushes the first docking piece 111 to fit against the inner wall of the first bracket 110.

[0050] Therefore, by tilting the first docking piece 111 relative to the axis of the first main section 112 in the separated state, a certain angle is provided between the first docking piece 111 and the inner wall of the first main section 112, thereby facilitating the second docking piece 121 to be sleeved on the first docking piece 111. By fitting the first docking piece 111 and the inner wall of the first main section 112 in the combined state, it is avoided that the first docking piece 111 bulges radially inward to form an obstruction to blood flow.

[0051] When the first stent 110 and the second stent 120 are not compressed, the diameter d2 of the second main body section 122 is greater than the diameter d1 of the first main body section 112. The minimum diameter of the second docking piece 121 is greater than the maximum diameter of the first docking piece 111. The maximum diameter of the first docking piece 111 is the same as the diameter d1 of the first main body section 112. The minimum diameter of the second docking piece 121 is the same as the diameter d2 of the second main body section 122. After the second stent 120 is inserted into the first stent 110, the outer wall of the second stent 120 is attached to the inner wall of the first stent 110 and there is a certain adhesion force between the two. The second docking piece 121 can press the first docking piece 111 against the inner wall of the second stent 120 to prevent blood flow from being retained in the gap between the first docking piece 111 and the first stent 110 to form a thrombus. The stiffness of the first docking piece 111 is greater than the stiffness of the second docking piece 121. The wire diameter of the first docking member 111 is greater than the wire diameter of the second docking member 121, or the rigidity of the first docking member 111 is greater than the rigidity of the second docking member 121. Therefore, by making the diameter of the first main body section 112 greater than the diameter of the second main body section 122, after the second main body section 122 is released in the first main body section 112, the second main body section 122 can fully fit the inner wall of the first main body section 112, and by making the rigidity of the second docking member 121 greater than the rigidity of the first docking member 111, the second docking member 121 has a strong radial supporting force, so that after being released, the first docking member 111 can be fully driven to fit the inner wall of the first main body section 112, so as to eliminate the gap between the first docking member 111 and the inner membrane of the first main body section 112.

[0052] like Figure 1 As shown, the first docking member 111 further includes a plurality of mounting rods 1111 , and the second docking member 121 includes a plurality of collars 1211 . In the combined state, the collars 1211 are suitable for being sleeved on the mounting rods 1111 .

[0053] The first docking member 111 includes a connecting ring 1112 and a plurality of mounting rods 1111. The connecting ring 1112 is connected to the first main body section 112. All mounting rods 1111 are connected to the connecting ring 1112. All mounting rods 1111 are arranged along the circumference of the connecting ring 1112. The mounting rods 1111 are arranged obliquely relative to the axis of the connecting ring 1112. The mounting rods 1111 can be welded, sutured or wound with the connecting ring 1112. In one embodiment, one end of the mounting rod 1111 is wound around the connecting ring 1112, and the other end of the mounting rod 1111 extends toward the radial inner side of the connecting ring 1112. The collar 1211 is connected to the axial end of the second main body section 122. There are a plurality of collars 1211, and a plurality of collars 1211 are arranged in a circumferential array at one axial end of the second main body section 122. The collar 1211 is provided with a hanging hole, the inner diameter of which is larger than the outer diameter of the mounting rod 1111, and the mounting rod 1111 can be inserted into the hanging hole. During the implantation process, the collar 1211 is inserted into the mounting rod 1111, and after the collar 1211 is completely released, the collar 1211 drives the mounting rod 1111 to fit the inner wall of the first stent 110. It can be understood that in some other embodiments, the mounting rod 1111 can be directly connected to the first main body section 112, for example, by welding, suturing or bonding.

[0054] Thus, the first docking member 111 includes a plurality of mounting rods 1111, and the mounting rods 1111 are tilted relative to the axis of the first main body section 112. The second docking member 121 includes a plurality of rings 1211, so that the rings 1211 can be easily matched with the mounting rods 1111 after being released, so that the rings 1211 can be sleeved on the mounting rods 1111.

[0055] like Figures 1 to 3 As shown, at least two adjacent mounting rods 1111 are connected, and in the combined state, a collar 1211 fits at least with two adjacent mounting rods 1111 .

[0056] Reference Figure 3, two adjacent mounting rods 1111 include a first mounting rod 1111a and a second mounting rod 1111b, and the first mounting rod 1111a and the second mounting rod 1111b are both inclined toward the axial centerline close to the first main body section 112. The first mounting rod 1111a and the second mounting rod 1111b are connected at one end close to the axial centerline, and there is a certain angle between the first mounting rod 1111a and the second mounting rod 1111b. The angle between the first mounting rod 1111a and the second mounting rod 1111b is between 15° and 75°. Specifically, the angle between the first mounting rod 1111a and the second mounting rod 1111b can be 15°, 30°, 40°, 45°, 60° or 75°. The other end of the first mounting rod 1111a (the end away from the axial center of the first main body section) is connected to the connecting ring 1112, and the other end of the second mounting rod 1111b (the end away from the axial center of the first main body section 112) is connected to the connecting ring 1112. The other ends of the first mounting rod 1111a and the second mounting rod 1111b are spaced apart. The collar 1211 is at least in contact with the first mounting rod 1111a and the second mounting rod 1111b.

[0057] In one embodiment, Figure 3 As shown, all the mounting rods 1111 in the circumferential direction are connected end to end to form an integrated annular structure, which includes an axial first end 1113 and an axial second end 1114. The axial first end 1113 is spaced apart from the inner wall of the first main body section 112, and the axial second end 1114 is in contact with the inner wall of the first main body section 112. The circumference of the axial first end 1113 is greater than that of the axial second end 1114. It should be noted that Figure 3In the figure, the axial first end 1113 refers to the end surface of the axial first end 1113 formed by the vertices of the axial first end. The axial second end 1114 refers to the end surface formed by the vertices of the axial second end. For example, in one embodiment, the first docking member 111 also includes a third mounting rod, a fourth mounting rod, a fifth mounting rod and a sixth mounting rod adjacent to each other in sequence, the first mounting rod 1111a and the second mounting rod 1111b are connected, and there is a certain angle between the first mounting rod 1111a and the second mounting rod 1111b, the second mounting rod 1111b and the third mounting rod are connected, and there is a certain angle between the second mounting rod 1111b and the third mounting rod, the third mounting rod and the fourth mounting rod are connected, and there is a certain angle between the third mounting rod and the fourth mounting rod, the fourth mounting rod and the fifth mounting rod are connected, and there is a certain angle between the fourth mounting rod and the fifth mounting rod, the fifth mounting rod and the sixth mounting rod are connected, and there is a certain angle between the fifth mounting rod and the sixth mounting rod, the sixth mounting rod is connected to the first mounting rod, and there is a certain angle between the sixth mounting rod and the first mounting rod 1111a. In this way, the first mounting rod 1111a, the second mounting rod 1111b, the third mounting rod, the fourth mounting rod, the fifth mounting rod and the sixth mounting rod are connected end to end in sequence to form an integrated ring structure. When the first mounting rod 1111a is deformed by force, the deformation stress on the first mounting rod 1111a can be transferred to other mounting rods (such as the adjacent second mounting rod 1111b and the sixth mounting rod).

[0058] Thus, by connecting at least two mounting rods 1111, the multiple mounting rods 1111 can be subjected to force as a whole in the circumferential direction, that is, when one mounting rod 1111 moves, it will pull the other mounting rod 1111 to move. Therefore, in the process of connecting the first docking member 111 and the second docking member 121, the ring 1211 can drive the mounting rod 1111 to move and drive the first docking member 111 as a whole to expand radially outward, so that the mounting rod 1111 fits against the inner wall of the first main body section 112.

[0059] like Figure 4 As shown, the artificial blood vessel assembly 100 also includes an inner concave member 130, which is sleeved on the first bracket 110. The inner concave member 130 is located on the outside of the first docking member 111. In the combined state, there is a certain force between the inner concave member 130 and the first main body section 112. The inner concave member 130 at least partially protrudes toward the radial inner side of the first bracket 110. The position of the inner concave member 130 is set corresponding to the combined position of the first docking member 111 and the second docking member 121.

[0060] The concave member 130 is sleeved on the outer wall of the first main body section 112, and the concave member 130 at least partially protrudes toward the inner side of the first main body section 112. The concave member 130 is used to press the side wall of the first main body section 112 against the first docking member 111 or the second docking member 121. The concave member 130 is sutured or bonded to the first main body section 112. The concave member 130 can be made of materials such as nickel-titanium alloy and medical stainless steel wire. The concave member 130 is an annular structure, and the side wall of the concave member 130 is a mesh structure. The concave member 130 can be formed by braiding wire and then heat-setting, or by a tubular member that is laser cut and then heat-set. The position of the concave member 130 is set corresponding to the position where the first bracket 110 and the second bracket 120 are joined, which means that after the first docking member 111 and the second docking member 121 are combined, the concave member 130 completely covers the first docking member 111 and the second docking member 121. Specifically, the concave member 130 completely covers the area s1 where the first docking member 111 and the second docking member 121 are combined.

[0061] The convex surface of the concave component 130 faces the radial inner side of the first main body section 112, and the concave surface of the concave component 130 faces the radial outer side of the first main body section 112. After the concave component 130 is sleeved on the first main body section 112, the concave component 130 presses the side wall of the first main body section 112 toward the radial inner side of the first main body section 112, so that the side wall of the first main body section 112 is deformed toward the radial inner side.

[0062] Thus, after the first bracket 110 and the second bracket 120 are docked, the second mounting rod 1111 is sleeved on the first mounting rod 1111, and the second mounting rod 1111 drives the first mounting rod 1111 to move toward the side wall of the bracket until the second mounting rod 1111 and the first mounting rod 1111 fit with the side wall of the bracket, and then are sleeved on the first main section 112 through the concave member 130. The position of the concave member 130 corresponds to the position where the first bracket 110 and the second bracket 120 are docked (the position where the first mounting rod 1111 and the second mounting rod 1111 are sleeved), so that the concave member 130 can compress the side wall of the first main section 112 to deform radially inward, so that the side wall of the first main section 112 has a certain fit with the first mounting rod 1111 or the second mounting rod 1111, thereby increasing the sealing performance at the docking position of the first bracket 110 and the second bracket 120 and reducing the possibility of leakage at this position.

[0063] Embodiment 2

[0064] The difference between this embodiment and the first embodiment is that Figures 5 to 7 As shown, the second bracket 220 further includes a sealing segment 223 , which is connected to one axial end of the second main segment 222 , and is located radially inward of the second docking piece 221 and at least partially covers the second docking piece 221 .

[0065] The sealing section 223 is connected to one axial end of the second main section 222, and the sealing section 223 is located at the proximal side of the second main section 222. The sealing section 223 is located radially inside the second docking piece 221. The radial projection of the sealing section 223 at least partially covers the second docking piece 221, and the radial projection of the sealing section 223 can partially cover the second docking piece 221 or completely cover the second docking piece 221. The sealing section 223 is a tubular structure, and the sealing section 223 and the second main section 222 jointly form a flow fluid channel. After the second bracket 220 is released, the outer wall of the sealing section 223 fits with the inner wall of the first main section 212, and the outer wall of the sealing section 223 also fits with the second docking piece 221, and the sealing section 223 presses the second docking piece 221 and the first docking piece 211 against the inner wall of the first main section 212.

[0066] After the first bracket 210 and the second bracket 220 are butted, the sealing segment 223 completely covers the first butt joint piece 211 and the second butt joint piece 221, and the sealing segment 223 forms a seal on the inner side of the first butt joint piece 211 and the second butt joint piece 221. Specifically, the sealing segment 223 includes an axial proximal end and an axial distal end, the axial distal end of the sealing segment 223 is located at the distal side of the first butt joint piece 211 and the second butt joint piece 221, and the axial proximal end of the sealing segment 223 is located at the proximal side of the first butt joint piece 211 and the second butt joint piece 221. The first butt joint piece 211 and the second butt joint piece 221 are located between the axial proximal end and the axial distal end of the sealing segment 223.

[0067] Therefore, after the first docking piece 211 and the second docking piece 221 are docked, the sealing section 223 is located radially inside the second docking piece 221 and at least partially covers the second docking piece 221, so that the sealing section 223 can form a barrier on the inner side of the second docking piece 221 to prevent the second docking piece 221 from contacting the blood flow in the cavity of the second stent 220 or the first stent 210, thereby reducing the possibility of blood flow impacting the first docking piece 211 or the first docking piece 211 to form a thrombus.

[0068] like Figure 8 and Fig. 9As shown, the first main body section 212 includes a plurality of first support rings 2121, and the plurality of first support rings 2121 are arranged at intervals along the axial direction of the first main body section 212. The second main body section 222 includes a spiral skeleton 2221, and the spiral skeleton 2221 includes a first spiral unit 2221a and a second spiral unit 2221b, and the first spiral unit 2221a and the second spiral unit 2221b are both arranged in a spiral along the axial direction of the second main body section 222, and the first spiral unit 2221a and the second spiral unit 2221b intersect, and the gap between the first spiral unit 2221a and the second spiral unit 2221b forms an axial limiting space, and the first support ring 2121 is located between the first spiral unit 2221a and the second spiral unit 2221b. Specifically, the first spiral unit 2221a includes a first vertex p1 located at the radial edge, and the second spiral unit 2221b includes a second vertex p2 located at the radial edge. The axial gap s2 between the first vertex p1 and the second vertex p2 forms an axial limiting space for the first support ring 2121. After the first bracket 210 and the second bracket 220 are combined, at least one first support ring 2121 is located between the first vertex p1 and the second vertex p2.

[0069] Therefore, by positioning the first support ring 2121 between the first spiral unit 2221a and the second spiral unit 2221b, the first spiral unit 2221a and the second spiral unit 2221b can form an axial limit for the first support ring 2121 to reduce the possibility of the second stent 220 being displaced and slipping under the influence of blood pressure.

[0070] like Fig.10 As shown, a limiting groove 2221c is formed at the intersection of the first spiral unit 2221a and the second spiral unit 2221b, and the notch of the limiting groove 2221c is arranged toward the radial outer side of the second bracket 220, and the intersection of the first spiral unit 2221a and the second spiral unit 2221b is located between the first vertex and the second vertex. After the first bracket 210 and the second bracket 220 are docked, the first support ring 2121 is clamped in the limiting groove 2221c, and the inner wall of the first support ring 2121 is fitted with the inner wall of the limiting groove 2221c. Thus, by forming the limiting groove 2221c at the intersection of the first spiral unit 2221a and the second spiral unit 2221b, the first support ring 2121 is clamped in the limiting groove 2221c, so that the limiting groove 2221c can limit the axial displacement of the first support ring 2121, thereby reducing the possibility of the second bracket 220 being displaced and slipping under the influence of blood flow pressure.

[0071] like Fig.11As shown, in other embodiments, the second main body section 222 includes a plurality of corrugations 2222, and the plurality of corrugations 2222 are arranged along the axial direction of the second main body section 222, and the limiting groove 2221c is provided on the side wall of the corrugation 2222, and the notch of the limiting groove 2221c is arranged toward the outside of the second bracket 220. After the first bracket 210 and the second bracket 220 are docked, the first support ring 2121 is clamped in the limiting groove 2221c, and the inner wall of the first support ring 2121 is fitted with the inner wall of the limiting groove 2221c. Thus, by forming the limiting groove 2221c at the intersection of the first spiral unit 2221a and the second spiral unit 2222b, the first support ring 2121 is clamped in the limiting groove 2221c, so that the limiting groove 2221c can limit the axial displacement of the first support ring 2121, thereby reducing the possibility of the second bracket 220 being displaced and slipping under the influence of blood pressure.

[0072] Embodiment 3

[0073] This embodiment provides a stent system 300, including the stent assembly and the delivery device 330 as described above. Fig.12 As shown, the delivery device 330 includes a handle 331 and a sheath tube 332, the handle 331 and the sheath tube 332 are connected, and the handle 331 is used to drive the sheath tube 332 to move toward the proximal direction. The second bracket 320 or the first bracket 310 is loaded in the sheath tube 332, and when the second bracket 320 or the first bracket 310 needs to be released, the handle 331 drives the sheath tube 332 to move toward the proximal direction, thereby realizing the release of the second bracket 320 or the first bracket 310.

[0074] During the docking process between the first bracket 310 and the second bracket 320, the distal end of the second bracket 320 is first released to expose the second docking member 321 at the distal end of the second bracket 320 in the first bracket 310, and the second bracket 320 is pushed toward the distal end to sleeve the second docking member 321 on the first docking member 311. Then, the second bracket 320 is completely released, and the conveying device 330 is withdrawn to achieve docking between the second bracket 320 and the first bracket 310.

[0075] like Fig.13As shown, the second bracket 320 also includes a first restraining film 324 and a second restraining film 325. The first restraining film 324 is located on the sealing section 323, and the first restraining film 324 is sutured and connected to the sealing section 323. The second restraining film 325 is located on the second main section 322, and the second restraining film 325 is sutured and connected to the second main section 322. The first restraining film 324 is arranged around the sealing section 323, and the first restraining film 324 is used to constrain the sealing section 323, so that the sealing section 323 is in a loading state. The second restraining film 325 is arranged around the second main section 322, and the second restraining film 325 is used to constrain the second main section 322, so that the second main section 322 is in a loading state. The first restraining film 324 and the second restraining film 325 are spaced apart in the axial direction, and the second docking member 321 is located between the first restraining film 324 and the second restraining film 325. Specifically, there is a certain gap between the distal end of the first binding film 324 and the proximal end of the second binding film 325, and there is a certain spacing distance between the distal end of the first binding film 324 and the proximal end of the second binding film 325, and the second mounting rod 3111 is located in the gap. The first binding film 324 and the second binding film 325 do not bind the second mounting rod 3111.

[0076] The first restraining film 324 has a restrained state and a natural state. When the first restraining film 324 is in the restrained state, the first restraining film 324 is covered on the sealing section 323, and there is a certain force between the first restraining film 324 and the sealing section 323 to compress the sealing section 323, so that the sealing section 323 is in a loaded state. When the first restraining film 324 is in the natural state, there is no force between the first restraining film 324 and the sealing section 323, so that the sealing section 323 is in a released state. The second restraining film 325 has a restrained state and a natural state. When the second restraining film 325 is in the restrained state, the second restraining film 325 is covered on the second main section 322, and there is a certain force between the second restraining film 325 and the second main section 322 to compress the second main section 322, so that the second main section 322 is in a loaded state. When the second restraining film 325 is in the natural state, there is no force between the second restraining film 325 and the second main section 322, and the second main section 322 is in a released state.

[0077] like Fig.14As shown, during the docking process between the second stent 320 and the first stent 310, after the sheath 332 is withdrawn to expose the sealing segment 323, the second docking member 321 and the second main body segment 322 in the first stent 310, the first restraining film 324 still restrains the sealing segment 323, so that the sealing segment 323 is in a loading state. The second restraining film 325 still restrains the second main body segment 322, so that the second main body segment 322 is in a loading state. After the second docking member 321 loses the restraint of the sheath 332, the second docking member 321 is released, so that the position of the second docking member 321 corresponds to the position of the first docking member 311. The conveying device 330 is pushed to move in the direction of the distal end side, so that the second mounting rod 3111 is sleeved on the first docking member 311. The first restraining film 324 and the second restraining film 325 are then released to unfold the sealing segment 323 and the second main body segment 322.

[0078] Thus, the first restraining film 324 is located on the sealing section 323, and the second restraining film 325 is located on the second main section 322, so that the first restraining film 324 can restrain the sealing section 323, and the second restraining film 325 can restrain the second main section 322. The first restraining film 324 and the second restraining film 325 are arranged at intervals, and the second docking member 321 is located in the gap between the first restraining film 324 and the second restraining film 325, so that after the sheath tube 332 is withdrawn, only the second docking member 321 is released, while the sealing section 323 and the second main section 322 are still in a compressed state. At this time, there is a certain slope between the second docking member 321 and the second main section 322 to facilitate the combination of the second docking member 321 and the first docking member 311. On the other hand, since the sealing section 323 and the second main section 322 are still in a compressed state, there is a certain gap between the sealing section 323 and the second main section 322 and the inner wall of the first bracket 310, so that it is convenient for the conveyor to drive the second bracket 320 to move in the first bracket 310.

[0079] like Fig.15As shown, the edge of the first restraining film 324 is provided with a plurality of threading holes, and the restraining wire 326 is passed through the plurality of threading holes to realize the restraint of the sealing segment 323 by the covering film. The restraining wire 326 can be made of nickel-titanium alloy material, medical stainless steel material or other materials with certain rigidity. The first restraining film 324 includes a first circumferential edge 3241 and a second circumferential edge 3242. The first restraining film 324 is provided with a plurality of first threading holes 3243 near the first circumferential edge 3241, and the first restraining film 324 is provided with a plurality of second threading holes 3244 near the second circumferential edge 3242. The restraining wire 326 passes through the first threading holes 3243 and the second threading holes 3244 in sequence to realize the restraint of the sealing segment 323 by the first restraining film 324. Specifically, the first restraining film 324 is provided with a first threading hole A 3243a, a first threading hole B 3243b, and a first threading hole C 3243c near the first circumferential edge 3241. The first tie film 324 is provided with a second threading hole A 3244a, a second threading hole B 3244b and a third threading hole C 3244c at a position close to the second circumferential edge 3242. The tie wire 326 passes through the first threading hole A 3243a, the second threading hole A 3244a, the first threading hole B 3243b, the second threading hole B 3244b, the first threading hole C 3243c and the second threading hole C 3244c in sequence, so that the first tie film 324 forms a tubular structure. After the tie wire 326 is tightened, the first tie film 324 can tie the sealing section 323, so that the sealing section 323 is compressed to a loading state. After the tie wire 326 is loosened, the first tie film 324 can loosen the sealing section 323, so that the sealing section 323 is in a released state.

[0080] The edge of the second restraining film 325 is provided with a plurality of threading holes, and the restraining wire 326 is passed through the plurality of threading holes to realize the restraint of the sealing section 323 by the covering film. The second restraining film 325 includes a third circumferential edge and a fourth circumferential edge, and the third circumferential edge is provided with a plurality of third threading holes, and the fourth circumferential edge is provided with a plurality of fourth threading holes, and the restraining wire 326 passes through the third threading holes and the fourth threading holes in sequence to realize the restraint of the second restraining film 325 on the second main section 322. Specifically, the third circumferential edge is provided with a third threading hole a, a third threading hole b, and a third threading hole c. The fourth threading hole a, the fourth threading hole b and the fourth threading hole c are opened on the fourth peripheral edge. The binding wire 326 passes through the third threading hole a, the fourth threading hole a, the third threading hole b, the fourth threading hole b, the third threading hole c and the fourth threading hole c in sequence, so that the second binding film 325 forms a tubular structure. After the binding wire 326 is tightened, the second binding film 325 can bind the second main body section 322, so that the second main body section 322 is compressed to a loading state. After the binding wire 326 is loosened, the second binding film 325 can loosen the second main body section 322, so that the second main body section 322 is in a released state.

[0081] After the second stent 320 is loaded, the tether 326 passes through the sheath 332 and is located outside the proximal end of the handle 331. Fig.16 As shown, the delivery device 330 also includes a push rod 333, which is inserted into the sheath tube 332, and the proximal end of the push rod 333 is connected to the handle 331. The push rod 333 is provided with a first pipe 3331 and a second pipe 3332, which are coaxially arranged, and the restraint line 326 passes through the first pipe 3331 and extends to the proximal side of the handle 331. The sheath core is inserted into the second pipe 3332.

[0082] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An artificial blood vessel assembly, characterized in that: The invention comprises a first bracket and a second bracket, wherein the first bracket comprises a first docking piece, the second bracket comprises a second docking piece, and the first docking piece and the second docking piece are sleeve-matched.

2. The artificial blood vessel assembly according to claim 1, characterized in that: The artificial blood vessel assembly includes a separated state and a combined state. In the separated state, the first docking piece is tilted relative to the axis of the first bracket. In the combined state, the first docking piece is inserted into the second docking piece and fits the inner wall of the first bracket.

3. The artificial blood vessel assembly according to claim 2, characterized in that: The first docking member further comprises a plurality of mounting rods, and the second docking member comprises a plurality of collars. In a combined state, the collars are suitable for being sleeved on the mounting rods.

4. The artificial blood vessel assembly according to claim 3, characterized in that: At least two adjacent mounting rods are connected, and the collar is at least sleeved on the two connected mounting rods.

5. The artificial blood vessel assembly according to claim 1, characterized in that: The artificial blood vessel assembly further comprises an inner concave member, which is sleeved on the first bracket and is arranged corresponding to the position where the inner concave member is sleeved with the first docking member and the second docking member.

6. The artificial blood vessel assembly according to claim 1, characterized in that: The second bracket includes a sealing section and a second main body section connected to each other, the second docking piece is connected to the sealing section or the second main body section, and the sealing section is located radially inside the second docking piece.

7. The artificial blood vessel assembly according to claim 6, characterized in that: The second bracket also includes a first restraining film and a second restraining film, the first restraining film is covered on the sealing section, the second restraining film is covered on the second main section, the first restraining film and the second restraining film are spaced apart, and the second docking piece is located between the first restraining film and the second restraining film.

8. The artificial blood vessel assembly according to claim 2, characterized in that: The first support further comprises a first support ring, and the second support comprises at least two intersecting spiral units. In the combined state, the first support ring is located in a gap between the two spiral units.

9. The artificial blood vessel assembly according to claim 8, characterized in that: The two spiral units form a limiting groove at the intersection position, the notch of the limiting groove is arranged toward the outside of the second bracket, and the first support ring is at least partially located in the limiting groove.

10. A support system, characterized in that: It comprises the artificial blood vessel assembly as described in any one of claims 1 to 9 and a delivery device, wherein the delivery device is used to deliver the first stent or the second stent.

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