Pre-selected branch artery type embedded branch type aorta covered stent system

Abstract

The utility model discloses a preselected branch artery type embedded branch type aorta covered stent system. The preselected branch artery type embedded branch type aorta covered stent system comprises an aorta covered stent and a conveying structure. The aorta covered stent comprises a main body stent and three embedded branch stents, three windows are arranged on the main body support, one ends of the three embedded branch supports are connected to the windows in an embedded mode, and the other ends of the embedded branch supports are all connected with guide catheters. The conveying structure comprises a sheath tube, a sheath core, a Tip head and three guide catheters; the embedded branch stent is detachably connected with the guide catheter; the far end of the sheath core is connected with the Tip head, the sheath core is sleeved with the main body support, and the main body support, the sheath core and the three guide catheters are sleeved with the sheath tube; a groove is formed in one end, close to the Tip head, of the sheathing canal; and the windows on the main body bracket are arranged at the positions corresponding to the grooves of the sheathing canal. The problem that it is very difficult to guide a branch guide wire to reach a branch blood vessel through a windowing structure is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to an inlaid branch type aortic covered stent system with a preselected branch artery type. Background Art

[0002] Thoracic aortic aneurysm or acute aortic syndrome (aortic intramural hematoma, aortic penetrating ulcer, aortic dissection) is a relatively dangerous disease in the fields of vascular surgery and cardiovascular surgery, often requiring surgical treatment. For some diseases, the affected range is distal to the left subclavian artery, and endovascular surgery can be performed by implanting a thoracic aortic covered stent. Compared with the open surgical method, it has the advantages of less trauma, low perioperative mortality, and rapid recovery. In recent years, more and more doctors and patients have chosen to use thoracic aortic covered stent implantation for treatment. For some diseases that involve the supra-aortic arterial branch vessels, in these cases, the successful development of aortic branch reconstruction technology can expand the surgical indications of the total endovascular repair technology.

[0003] For thoracic aortic aneurysm or dissection involving the supra-aortic arteries, a "fenestrated stent graft" is used to implant a stent graft in such patients, that is, a main stent is implanted in the thoracic aorta, a fenestration structure is opened in the main stent, and a branch stent is installed in the fenestration structure to lead to the branch vessel. The stent graft implanted for endovascular treatment of thoracic aortic aneurysm or dissection involves the reconstruction of the innominate artery, left common carotid artery, and left subclavian artery vessels.

[0004] In the prior art, after the main stent is implanted into the arterial vessel, it is necessary to repeat the implantation of the branch stent. Before implanting the branch stent, it is necessary to guide the branch guide wire through the fenestration structure of the main stent into the branch vessel, and then guide the branch stent through the fenestration structure of the main stent to the branch vessel through the branch guide wire.

[0005] However, it is very difficult to guide the branch guide wire to the branch vessel. The reason is that the branch guide wire first has to pass through the fenestration structure of the main stent, and then the tip of the branch guide wire is superselected into the branch vessel. In most cases, the fenestration position of the main stent and the branch vessel are not necessarily in the same plane, which makes these two consecutive superselection steps face huge challenges. How to effectively reduce the difficulty of the branch guide wire reaching the branch vessel through the fenestration structure is a problem that current medical staff and medical R & D personnel must jointly solve.

[0006] Therefore, it is necessary to design an inlaid branch type aortic covered stent system with a preselected branch artery type. Summary of the Invention

[0007] The purpose of the present utility model is to provide a preselected branch artery type embedded branch aortic covered stent system to solve the problem that it is very difficult to guide the branch guide wire to reach the branch blood vessel through the fenestration structure in the background art.

[0008] To achieve the above object, the present utility model provides a preselected branch artery type embedded branch aortic covered stent system, including an aortic covered stent and a delivery structure;

[0009] The aortic covered stent includes a main stent and three embedded branch stents. The main stent and the three embedded branch stents are both composed of a stent body with an annular structure and a film; the embedded branch stents are arranged inside the main stent; three fenestrations are arranged on the peritoneal region of the main stent, and the three fenestrations respectively correspond to the innominate artery, the left common carotid artery, and the left subclavian artery. One ends of the three embedded branch stents are respectively embedded and connected to the inner sides of the three fenestrations of the main stent;

[0010] The delivery structure includes a sheath, a core wire, a Tip head, and three guiding catheters. The other ends of the embedded branch stents are all connected with guiding catheters for the guide wire to pass through; the connection between the embedded branch stent and the guiding catheter is detachable; the distal end of the core wire is connected to the Tip head, the main stent is sleeved outside the core wire, and the sheath is sleeved outside the main stent, the core wire, and the three guiding catheters; a groove is provided at one end of the sheath close to the Tip head;

[0011] The three fenestrations on the main stent are all arranged at positions corresponding to the groove of the sheath.

[0012] In a specific embodiment, the length of the embedded branch stent is 2 cm.

[0013] In a specific embodiment, the two sides of the groove of the sheath are parallel to each other.

[0014] In a specific embodiment, the connection between the embedded branch stent and the guiding catheter is achieved by connecting with multiple contact points.

[0015] In a specific embodiment, the delivery structure further includes a handle, and the handle is connected to the end of the sheath away from the Tip head.

[0016] In a specific embodiment, three guide wire holes are provided on the handle, and the three guide wire holes are respectively connected to the three guiding catheters.

[0017] In a specific embodiment, the diameter of the guiding catheter is 1.5 mm.

[0018] Compared with the prior art, the present utility model has the following beneficial effects:

[0019] The utility model solves the problem that it is very difficult to guide the branch guide wire to reach the branch blood vessel through the fenestration structure.

[0020] By using the utility model, the work of guiding the wire through the fenestration structure of the main stent can be completed outside the body, greatly reducing the operation difficulty of doctors, indirectly shortening the operation time, thereby improving the operation success rate and reducing the operation risk.

[0021] The guiding catheter of the utility model forms a track for the wire to pass through, enabling the entire aortic covered stent to enter the appropriate position along the wire, reducing the difficulty of the entire operation.

[0022] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The following will refer to the drawings to further elaborate on the utility model in detail. Brief Description of the Drawings

[0023] The drawings forming a part of this application are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model. In the drawings:

[0024] Figure 1 is a schematic cross-sectional view of an aortic covered stent according to an embodiment of the utility model;

[0025] Figure 2 is a schematic view of an aortic covered stent according to an embodiment of the utility model;

[0026] Figure 3 is a schematic cross-sectional view at the middle part of the sheath of the delivery structure according to an embodiment of the utility model;

[0027] Figure 4 is a schematic view of the sheath near the Tip end according to an embodiment of the utility model;

[0028] Figure 5 is a schematic view of an embodiment of the utility model;

[0029] Among them, 11, main stent; 12, embedded branch stent; 21, sheath; 22, sheath core; 23, Tip; 24, guiding catheter; 25, handle; 111, fenestration; 211, groove. Detailed Description of the Specific Embodiment

[0030] The following will elaborate on the embodiments of the utility model in detail with reference to the drawings, but the utility model can be implemented in various different ways defined and covered by the claims.

[0031] Embodiment 1

[0032] A preselected branched artery type embedded branched aortic covered stent system provided by the utility model comprises an aortic covered stent and a delivery structure;

[0033] The aortic covered stent includes a main stent 11 and three embedded branched stents 12. The main stent 11 and the three embedded branched stents 12 are each composed of a plurality of stent bodies with annular structures and a film; the embedded branched stents 12 are embedded inside the main stent 11; three fenestrations 111 are provided on the main stent 11, and the three fenestrations 111 respectively correspond to the innominate artery, the left common carotid artery, and the left subclavian artery. One ends of the three embedded branched stents 12 are respectively embedded and connected to the inner sides of the three fenestrations of the main stent 11;

[0034] The delivery structure includes a sheath 21, a core wire 22, a Tip head 23, and three guiding catheters 24. The other ends of the embedded branched stents 12 are each connected to a guiding catheter 24, and the guiding catheter 24 is used for a guide wire to pass through; the embedded branched stent 12 and the guiding catheter 24 are connected in a detachable manner; the distal end of the core wire 22 is connected to the Tip head 23, the main stent 11 is sleeved outside the core wire 22, and the sheath 21 is sleeved outside the main stent 11, the core wire 22, and the three guiding catheters 24; a groove 211 is provided at one end of the sheath 21 close to the Tip head 23;

[0035] The three fenestrations 111 on the main stent 11 are all arranged at positions corresponding to the groove 211 of the sheath 21.

[0036] The length of the embedded branched stent 12 is 2 cm.

[0037] The two sides of the groove 211 of the sheath 21 are parallel to each other.

[0038] The embedded branched stent 12 and the guiding catheter 24 are connected by a manner of being connected with multiple contact points. After applying a certain pulling force along the catheter direction during the release process, the embedded branched stent 12 and the guiding catheter 24 can be disengaged so as to withdraw the guiding catheter 24 out of the body.

[0039] The delivery structure further includes a handle 25, and the handle 25 is connected to the end of the sheath 21 far from the Tip head.

[0040] Three guide wire holes are provided on the handle 25, and the three guide wire holes are respectively connected to the three guiding catheters 24.

[0041] The diameter of the catheter 24 is 1.5 mm.

[0042] During use, the guidewire catheter is first inserted through the femoral artery, and the innominate artery, left common carotid artery and left subclavian artery are selected and inserted into the distal end of the branch blood vessels. The distal ends of the three guidewires are retained outside the body through the femoral artery puncture point, that is, a guidewire track is established in the patient's body. The guidewires pulled out of the body are then placed into the three windows on the main stent, and the guidewires pass through the embedded branch stent and the guide catheter, and pass out from the three guidewire holes on the handle. The aortic covered stent is then delivered to the aortic arch using the delivery structure. With the assistance of the guidewire, the three windows on the main stent correspond to the innominate artery, left common carotid artery and left subclavian artery respectively. After releasing the aortic covered stent, a certain pulling force is applied in the direction of the guide catheter outside the body to disconnect the guide catheter. Using the established guidewire channel, the branch stents of the innominate artery, left common carotid artery and left subclavian artery are introduced, and the branch stents of the innominate artery, left common carotid artery and left subclavian artery are connected with the embedded branch stents at the three window openings on the main stent, that is, one end of the branch stent of the innominate artery, left common carotid artery and left subclavian artery is released into the branch blood vessels, and the other end is released into the embedded branch stent embedded in the corresponding window opening on the main stent.

[0043] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A preselected branch artery type endovascular branched aortic stent-graft system, characterized in that, It includes an aortic covered stent and a delivery structure; The aortic covered stent includes a main stent (11) and three embedded branch stents (12). Both the main stent (11) and the three embedded branch stents (12) are composed of a stent body with an annular structure and a film. Three fenestrations (111) are provided in the peritoneal area of the main stent (11), and the three fenestrations (111) are respectively used to correspond to the innominate artery, the left common carotid artery, and the left subclavian artery. One ends of the three embedded branch stents (12) are respectively embedded and connected to the inner sides of the three fenestrations of the main stent (11). The delivery structure includes a sheath tube (21), a sheath core (22), a Tip head (23), and three guiding catheters (24). The other ends of the embedded branch stents (12) are all connected to guiding catheters (24), and the guiding catheters (24) are used for wires to pass through. The connection between the embedded branch stent (12) and the guiding catheter (24) is made in a detachable manner. The distal end of the sheath core (22) is connected to the Tip head (23). The main stent (11) is sleeved outside the sheath core (22), and the sheath tube (21) is sleeved outside the main stent (11), the sheath core (22), and the three guiding catheters (24). One end of the sheath tube (21) close to the Tip head (23) is provided with a groove (211). The three fenestrations (111) on the main stent (11) are all arranged at positions corresponding to the groove (211) of the sheath tube (21).

2. The preselected branch artery type endovascular branched aortic stent-graft system according to claim 1, wherein The length of the embedded branch stent (12) is 2 cm.

3. The preselected branch artery type endovascular branched aortic covered stent system according to claim 1, characterized in that, The two sides of the groove (211) of the sheath tube (21) are parallel to each other.

4. The preselected branch artery type embedded branch aortic covered stent system according to claim 1, wherein The connection between the embedded branch stent (12) and the guiding catheter (24) is made by connecting with multiple contact points.

5. The preselected branch artery type embedded branched aortic covered stent system according to claim 1, wherein The delivery structure further includes a handle (25), and the handle (25) is connected to the end of the sheath tube (21) away from the Tip head.

6. The preselected branch artery type embedded branch aortic covered stent system according to claim 5, wherein Three wire holes are provided on the handle (25), and the three wire holes are respectively connected to the three guiding catheters (24).

7. The preselected branch artery type embedded branch aortic covered stent system according to claim 1, characterized in that, The diameter of the guiding catheter (24) is 1.5 mm.

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