Windowing covered stent blood vessel and conveying system

Abstract

The invention discloses a windowing covered stent blood vessel and a delivery system, and belongs to the field of medical instruments, the windowing covered stent blood vessel comprises a covered stent blood vessel main body and a windowing assembly arranged on the covered stent blood vessel main body; wherein the windowing assembly at least comprises a barrel-shaped structural part and a connecting part, and the barrel-shaped structural part is provided with a channel matched with the branch support; the connecting piece is used for connecting the cylindrical structural piece and the covered stent blood vessel main body; the connecting piece is provided with a buffer part, so that the cylindrical structural piece is flexibly connected with the covered stent blood vessel main body; according to the windowing assembly, blocking of the branch support can be effectively avoided, and good wall attaching performance can be provided for the embedded branch support through the buffering part.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a fenestrated covered stent blood vessel and a delivery system. Background Art

[0002] The fenestration technology of covered stent grafts refers to artificially opening a "window" on the original covered stent. The distal end of the "window" is a branch vessel, allowing the blood pumped from the heart to flow out of the window and then flow to various parts of the body through the branch vessels. Due to the diameter of each person's branch vessels and the angle with the main blood vessels are different. There will be a mismatch between traditional branch vessels and main blood vessels, resulting in stenosis and leakage at the "window". Stenosis will lead to a decrease in blood flow through the branch vessels, resulting in insufficient blood supply to distal tissues. Endoleakage will cause blood overflow, causing fatal damage to the patient. In this way, important blood vessels can be protected from being blocked and organ function can be preserved to the greatest extent. There are two types of existing fenestrated covered blood vessels: One method is to manufacture pre-fenestrated stent-grafts that conform to the anatomical morphology of the aortic arch of different patients. This type of stent-graft has good support and positioning capabilities. During surgery, the doctor will directly open the window according to the doctor's needs. On the one hand, this method will increase the doctor's labor intensity and reduce work efficiency. On the other hand, it is difficult to ensure that the position of the window and the position of the blood vessel are exactly opposite during surgery. When an internal fistula occurs around the window, the skeleton structure within the window will block the release and shaping of the branch stent, which is prone to internal leakage and difficult to handle. The other type refers to a covered stent-graft vessel with a pre-opened window. This method is relatively complicated to operate, and the window position is difficult to ensure alignment, and the window cannot be kept in a good open state during the operation.

[0003] Therefore, a pre-fenestrated stent graft is urgently needed to solve the following problems: (1) The structure within its window will not hinder the release and shaping of the branch stent and will not cause internal leakage; (2) The window always remains open. Summary of the Invention

[0004] The present invention provides a fenestrated covered stent vessel and a delivery system, which can at least solve one problem pointed out in the background art.

[0005] A fenestrated stent-graft vessel comprises a stent-graft vessel body and a fenestration assembly arranged on the stent-graft vessel body; Wherein, the window opening assembly at least includes: a cylindrical structural member having a channel cooperating with the branch bracket; and A connector, used to connect the cylindrical structural member and the stent graft vessel body; The connecting piece has a buffer portion so that the tubular structure is flexibly connected to the covered stent vessel body.

[0006] Preferably, the buffer portion is a U-shaped structural groove.

[0007] Preferably, the hardness of the connecting member is lower than that of the cylindrical structural member.

[0008] Preferably, it further comprises an inner sleeve and an outer sleeve, wherein the inner sleeve and the outer sleeve wrap the window assembly.

[0009] Preferably, a felt piece is further included, and the felt piece matches the channel of the cylindrical structural member.

[0010] Preferably, the inner sleeve and the outer sleeve are both made of PET.

[0011] Preferably, the stent graft vessel body comprises a PET film and a plurality of M-shaped stents, Z-shaped stents and fixed stents; The M-shaped bracket, the Z-shaped bracket and the fixed bracket are sequentially arranged and sewn onto the PET film at different intervals from the proximal end and the distal end along the axial direction of the PET film.

[0012] Preferably, the materials of the M-shaped bracket, the Z-shaped bracket and the fixed bracket are all nickel-titanium alloy.

[0013] A delivery system for delivering a fenestrated stent-graft vessel, comprising a handle, a support tube, and a fixator that cooperates with the stent-graft vessel body; The covered stent vessel body has a fixed stent having a plurality of V-shaped structures distributed along the circumference. A plurality of protrusions are installed on the fixator, and any protrusion is located in the V-shaped structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the window assembly of the present invention can effectively avoid the obstruction of the branch bracket, and can provide good wall adhesion for the embedded branch bracket through the buffer portion; The delivery system of the present invention can play a role in axially fixing the fenestrated coated blood vessels, and no axial shortening occurs during the compression and contraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a fenestrated stent-graft vessel; Figure 2 It is a structural diagram of the window assembly, inner sleeve, outer sleeve and felt piece; Figure 3 is a structural diagram of a window assembly; Figure 4 A cross-sectional view of a fenestrated stent-graft vessel and a fenestrated assembly; Figure 5This is a structural diagram of the branch bracket embedded in the window assembly; Figure 6 This is a schematic diagram of the structure of the branch bracket after it moves within the window assembly; Figure 7 It is a structural diagram of the M-type bracket; Figure 8 It is a structural diagram of the Z-type bracket; Figure 9 is a structural diagram of a fixed bracket; Figure 10 It is a structural diagram of the conveying system; Figure 11 Schematic diagram of the structure of the fixator.

[0016] Description of reference numerals: 1- covered stent vessel body, 2- window assembly, 3- cylindrical structural member, 4- connecting member, 5- buffer part, 6- branch stent, 7- inner sleeve, 8- outer sleeve, 9- felt piece, 10- M-type stent, 11- Z-type stent, 12- fixed stent, 13- PET film, 14- fixator, 15- protrusion, 16- suture. DETAILED DESCRIPTION

[0017] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment. Example 1

[0018] like Figures 1 to 6 As shown, an embodiment of the present invention provides a fenestrated stent graft vessel, comprising a stent graft vessel body 1 and a fenestration assembly 2 provided on the stent graft vessel body 1; like Figure 3 As shown, the fenestration assembly 2 of this embodiment includes at least a cylindrical structure 3 and a connector 4, wherein the cylindrical structure 3 has a channel for cooperating with the branch stent 6, and the connector 4 is used to connect the cylindrical structure 3 and the covered stent vessel body 1; In order to make the branch bracket 6 embedded in the cylindrical structure 3 have super flexibility, Figure 2 As shown, the connector 4 has a buffer portion 5 to enable the tubular structure 3 to be flexibly connected to the covered stent vessel body 1. The flexible connection here refers to the tubular structure 3 and the branch stent 6 assembled in the tubular structure 3 having the freedom of movement within the deformation range of the connector 4 (such as Figures 5 and 6 As shown), it is possible to ensure that the window opening (i.e., the internal channel of the cylindrical structural member 3) always remains open; In some other embodiments, the buffer portion 5 is a U-shaped structural groove. Of course, it can also be a V-shaped groove, a W-shaped groove, etc. Those skilled in the art can make adaptive settings according to actual conditions. The hardness of the connecting member 4 of this embodiment is lower than that of the cylindrical structural member 3. Specifically, the window assembly 2 is formed by two injection vulcanization processes of a bottom tubular hard silicone (cylindrical structural member 3) and an upper superelastic liquid silicone rubber (connecting member 4). The deformation of the buffer portion 5 provides good wall adhesion for the embedded branch bracket 6, and the cylindrical structural member 3 having a harder hardness than that of the connecting member 4 provides a larger contact area and tightening force for the embedded branch bracket 6. In addition, the cylindrical structural member 3 has sufficient hardness to effectively avoid blockage of the branch bracket 6. Example 2

[0019] This embodiment proposes a fenestrated stent graft based on the first embodiment, such as Figure 2 As shown, it also includes an inner sleeve 7, an outer sleeve 8 and a felt piece 9. In this embodiment, the inner sleeve 7 and the outer sleeve 8 are both made of PET; like Figure 2 As shown, the inner sleeve 7 and the outer sleeve 8 wrap the fenestration assembly 2 and fix it by bonding or suturing with sutures 16, and then the felt piece 9 is sutured into the channel of the cylindrical structure 3. Finally, the fenestration assembly 2 is sewn as a whole to the opening of the covered stent vessel body 1 corresponding to the fenestration assembly 2 with sutures 16. The felt piece 9 contacts the branch stent 6, effectively preventing the occurrence of internal leakage; Example 3

[0020] This embodiment proposes a fenestrated stent graft based on the second embodiment, such as Figure 4 、 Figures 7 to 9 As shown, the covered stent-graft vessel body 1 includes a PET film 13 and a plurality of M-shaped stents 10, Z-shaped stents 11 and a fixed stent 12. The M-shaped stents 10, Z-shaped stents 11 and fixed stents 12 are arranged in sequence along the axial direction of the PET film 13 from the proximal end and the distal end at different intervals and sewn to the PET film 13. The M-shaped stent 10 is sewn to the PET film 13 after the fenestration assembly 2 to prevent the contraction or release of the covered stent-graft vessel body 1 from interfering with the fenestration assembly 2. The various stents described above in this embodiment are all formed by heat-setting nickel-titanium alloy wire. Example 4

[0021] This embodiment provides a delivery system for delivering the fenestrated stent graft of the first embodiment, the second embodiment, or the third embodiment. Figure 10 and Figure 11 As shown, it includes a handle, a support tube, and a fixator 14 that cooperates with the stent graft vessel body 1; Specifically, the covered stent vessel body 1 has a fixing bracket 12, which has a plurality of V-shaped structures distributed along the circumference. A plurality of protrusions 15 are installed on the fixator 14, and any protrusion 15 is located in the V-shaped structure. In this embodiment, taking the corresponding two protrusions 15 as an example, when the diameter of the fenestrated stent graft is reduced, the fixing bracket 12 at the front end will be hung on the protrusions 15, playing the role of axially fixing the fenestrated stent graft, and it will not be axially shortened during the compression and constriction process. The specific release process: "The fenestrated stent graft is compressed to a certain diameter using a tool, and then installed on the delivery system to ensure that its fixed support 12 is fixed to the fixture 14 of the delivery system. The outside is fixed with a PET restraint sleeve with a wire drawstring. After assembly, the operating handle moves the fenestrated stent graft to the position where it needs to be released. Pull down the wire drawstring to release the restraint of the PET restraint sleeve, and the fenestrated stent graft is perfectly attached to the native blood vessel wall. This process is simple to operate and will not cause the fenestrated stent graft to shorten or shift due to factors such as operation, paving the way for the subsequent accurate installation of the embedded branch.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0023] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A fenestrated stent graft, characterized in that: It includes a stent-graft blood vessel body and a window assembly arranged on the stent-graft blood vessel body; Wherein, the window opening assembly at least includes: a cylindrical structural member having a channel cooperating with the branch bracket; and A connector, used to connect the cylindrical structural member and the stent graft vessel body; The connecting piece has a buffer portion so that the tubular structure is flexibly connected to the covered stent vessel body.

2. The fenestrated stent graft according to claim 1, wherein: The buffer portion is a U-shaped structural groove.

3. The fenestrated stent graft according to claim 1, wherein: The hardness of the connecting member is lower than that of the cylindrical structural member.

4. The fenestrated stent graft according to claim 1, wherein: It also includes an inner sleeve and an outer sleeve, which wrap the window assembly.

5. The fenestrated stent graft according to claim 1, wherein: The utility model further comprises a felt piece, which is matched with the channel of the cylindrical structural member.

6. The fenestrated stent graft according to claim 4, wherein: The inner sleeve and the outer sleeve are both made of PET.

7. The fenestrated stent graft according to claim 1, wherein: The covered stent vessel body includes a PET film and a plurality of M-shaped stents, Z-shaped stents and a fixed stent; The M-shaped bracket, the Z-shaped bracket and the fixed bracket are sequentially arranged and sewn onto the PET film at different intervals from the proximal end and the distal end along the axial direction of the PET film.

8. The fenestrated stent graft according to claim 7, characterized in that: The materials of the M-shaped bracket, Z-shaped bracket and fixed bracket are all nickel-titanium alloy.

9. A delivery system for delivering the fenestrated stent graft according to any one of claims 1 to 8, characterized in that: It includes a handle, a support tube and a fixator that cooperates with the covered stent blood vessel body.

10. The delivery system according to claim 9, wherein: The covered stent vessel body has a fixed stent having a plurality of V-shaped structures distributed along the circumference. A plurality of protrusions are installed on the fixator, and any protrusion is located in the V-shaped structure.

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