Stent system for repairing aortic dissection crevasse in visceral region

Abstract

The invention discloses a stent system for repairing an aortic dissection crevasse in a visceral area, which comprises a bare stent (1) and a patch (2) sewn on the outer surface of the bare stent (1), the patch (2) is used for blocking the aortic dissection crevasse or an inner leakage opening, and the stent system is characterized in that the patch (2) is provided with a honeycomb-shaped opening area; a plurality of small through holes (4) are formed in the honeycomb-shaped opening area, the diameter of each small through hole (4) ranges from 1.5 mm to 2 mm, the distance between every two adjacent small through holes (4) ranges from 1.5 mm to 2 mm, metal sutures (5) are arranged around the edge of the patch (2), and bimetal marks (3) are further arranged at the front end of the patch (2) and correspond to two edge points, sewn and fixed on the support, of the patch (2) so that the position of the patch (2) can be developed in an operation. The honeycomb-shaped porous patch structure not only can repair an interlayer crevasse, but also can retain an intervention channel, so that the reconstruction of an affected blood vessel and the implementation of false cavity embolism in an operation are facilitated, and the operation risk is reduced; a bare stent and patch structure and specially designed marks are convenient for intraoperative positioning; only one visceral artery opening is temporarily influenced and reconstructed while the crevasse is repaired, the operation is very simple, and the operation difficulty is low.

Description

Technical Field:

[0001] The present invention relates to a stent system for repairing the rupture opening of the aortic dissection in the visceral area, belonging to a self-expanding stent and being used in minimally invasive surgery for repairing human blood vessels. Background Art:

[0002] The rupture opening of the aortic dissection in the visceral area is mainly caused by etiologies such as hypertension, hyperlipidemia, atherosclerosis, or abnormal development of its own blood vessels. The elasticity of the arterial wall decreases, and combined with the high-pressure state inside the blood vessel, it is extremely easy to cause the formation of a dissection in the blood vessel wall. When a patient has a rupture opening of the aortic dissection in the visceral area, the main treatment is surgery. The patient can undergo artificial blood vessel replacement under anesthesia or endovascular treatment.

[0003] Such as Figure 1 、 Figure 2 shown, the rupture opening of the aortic dissection in the visceral area is often located near the openings of the celiac trunk artery, superior mesenteric artery, and renal artery. In some cases, it even straddles the openings of the visceral arteries. And the positions of these several arterial openings are adjacent to each other. When repairing the rupture opening in this area, it is necessary to consider reconstructing the celiac trunk artery, superior mesenteric artery, and renal artery simultaneously, and 4 important branches need to be reconstructed; in many patients, there are accessory renal arteries, so even 6 important branches need to be reconstructed; moreover, in aortic dissection cases, due to the compression of the false lumen, the true lumen is often very narrow, and the operating space is extremely limited. The four-branch reconstruction in the visceral area is more difficult than the four-branch reconstruction of aneurysms. Moreover, due to the narrow space, the blood vessel branches are prone to compress each other, and the long-term patency rate is also difficult to guarantee. Once the blood vessel branches are covered, serious visceral ischemia often occurs, and the consequences are extremely serious. At present, the multi-branch reconstruction techniques for repairing the aortic dissection in the visceral area often take more than 5 to 7 hours, cost more than 500,000, and the long-term effects cannot be guaranteed. Therefore, this technique is only carried out in very few medical units. The vast majority of aortic dissections in the visceral area can only be treated conservatively, and it is easy to evolve into dissecting aneurysm in the long term, ultimately leading to inevitable rupture or occlusion of important visceral blood vessels due to compression, ultimately resulting in ischemia of important organs.

[0004] Xianjian Technology's G-Branch TM The thoracic and abdominal aortic covered stent to be launched in China can solve the problem of four-branch reconstruction of most visceral arteries to a certain extent through the designed 2 embedded and 2 everted branches. However, it still cannot handle cases with more than four-branch reconstructions such as accessory renal arteries, or cases with a highly stenotic true lumen caused by dissection. Moreover, the structure of 2 inner branches and 2 outer branches does not conform to the natural hemodynamic principle of the human body, and the long-term effects still need to be observed. In addition, the structure of the covered stent will inevitably block the intercostal arteries and lumbar arteries in the corresponding segments, which may cause spinal cord ischemia and lead to paraplegia.

[0005] However, embolization with ordinary coils or embolization materials of other designs has defects such as endoleak, displacement, and insufficient compression of the false lumen, and the effect is not ideal.

[0006] A utility model found by the inventor discloses a patch-type stent for occluding the tear and postoperative endoleak of aortic dissection (such as CN220141880U). The patch-type stent includes a bare stent and a patch sutured on the outer surface of the bare stent. The patch is used to occlude the tear or endoleak opening of aortic dissection, and the area of the patch is set according to the size of the tear or endoleak opening. After the patch-type stent for occluding the tear and postoperative endoleak of aortic dissection is implanted into the diseased blood vessel, the patch can occlude the tear or endoleak opening of the diseased blood vessel. The area of the patch is set according to the size of the tear or endoleak opening, which can occlude the aortic tear and endoleak more accurately than the fully covered stent, does not affect the normal blood vessels, reduces the incidence of paraplegia, reduces the surgical risk caused by the loss of blood vessels, reduces the surgical difficulty of fenestration of multi-branched blood vessels, and at the same time reduces the economic burden of patients. However, this patent is mainly applied to the repair of simple tears in non-visceral areas and does not involve or apply to the repair of tears in visceral areas.

[0007] The utility model CN220141880U also mentions that "preferably, the patch is provided with a window corresponding to the position of the branched blood vessel. Preferably, a branched stent is pre-sewn at the window." It mentions that drilling a hole or pre-sewing a stent on the patch is not excluded. This design can theoretically be used to reconstruct an important branch, but it is difficult to ensure the accuracy of alignment with the single-hole setting. Pre-sewing the branched stent is only a temporary modification on the operating table and is not an original patent design. The patent specification mentions that "in one embodiment of the present utility model, as Figure 2 shown, the patch 2 of the patch-type stent for occluding the tear and postoperative endoleak of aortic dissection is provided with a window 3 corresponding to the position of the branched blood vessel. After the stent is implanted, the opening of the branched blood vessel cannot be covered. Therefore, the patch 2 is cut according to the surrounding blood vessel distribution before surgery so that a window 3 is provided at the position corresponding to the branched blood vessel, and blood can flow from the bare stent 1 through the window 3 through the patch 2 into the branched blood vessel." This also fully shows that the patent does not originally include the opening. The inventor of this patent considered that in necessary cases during the operation, an external window or a branched stent can be sewn according to the specific situation. This operation will damage the integrity of the stent to a certain extent and increase the risk of infection, and the safety cannot be guaranteed. Moreover, the single-hole design has the risk of misalignment, and it may still block the opening of the visceral artery and cannot take into account subsequent salvage interventional operations. Summary of the Invention:

[0008] The object of the present invention is to provide a stent system for repairing the rupture opening of aortic dissection in the visceral area, which is a completely new design. By using a patch structure with a honeycomb-shaped opening area provided with multiple small through-holes, while blocking the dissection rupture opening, it provides a potential safety passage to reconstruct the affected vascular branches in the visceral area and perform rupture opening and false lumen embolization when necessary. It is completely different from the previous designs and is especially suitable for the repair of dissections in the visceral artery area where there are multiple important vascular branches. It can effectively repair the dissection rupture opening while maximizing the blood flow supply to the important vascular branches.

[0009] The object of the present invention is achieved by the following technical solutions:

[0010] A stent system for repairing the rupture opening of aortic dissection in the visceral area, comprising a bare stent and a patch sutured on the outer surface of the bare stent. The patch is used to block the aortic dissection rupture opening or the endoleak orifice, and is characterized in that: the patch is provided with a honeycomb-shaped opening area, and multiple small through-holes are arranged in the honeycomb-shaped opening area. The diameter of the small through-holes is in the range of 1 mm - 2 mm, and the distance between two adjacent small through-holes is in the range of 1 mm - 2 mm. Metal sutures are arranged around the edge of the patch to visualize the position of the patch during the operation.

[0011] Preferably, double metal markers are further provided at the front end of the bare stent. The double metal markers correspond to two edge points where the patch is sutured and fixed on the stent to visualize the position of the bare stent during the operation.

[0012] Preferably, when the patch is unfolded into a plane, it is rectangular or square, and the honeycomb-shaped opening area is an array of several rows of small through-holes.

[0013] Preferably, the width H of the patch is in the range of 20 mm - 30 mm, and the length L1 is in the range of 40 mm - 60 mm.

[0014] Preferably, the diameter of the bare stent is in the range of 16 mm - 36 mm, and the length is in the range of 60 mm - 100 mm.

[0015] Preferably, the patch is sutured at the middle position of the bare stent. The bare stent refers to a vascular stent without an outer membrane.

[0016] Preferably, the bare stent is a skeleton woven from nitinol alloy, and the outer layer of the patch can be provided with hair or filamentous structures to prevent edge leakage and further slow down the blood flow in the false lumen, promoting the formation of false lumen thrombus.

[0017] Preferably, the range of the circumferential angle α corresponding to the above-mentioned patch 2 is in the range of 60 degrees - 120 degrees.

[0018] Compared with the prior art, the present invention has the following effects:

[0019] Effect 1: The patch-type stent system with honeycomb openings of the present invention can be applied to the repair of visceral aortic dissection ruptures. The patch structure with honeycomb openings and hairy edges on one side can repair the rupture. At the same time, the densely distributed small through-holes with a diameter of 1 mm - 2 mm can slow down the blood flow at the rupture and in the false lumen, while retaining the intervention channel, facilitating intraoperative reconstruction of the affected blood vessels and performing false lumen embolization. Generally, during the operation, only one visceral artery opening is temporarily blocked while repairing the rupture, without affecting the blood supply of the other several visceral arteries, reducing the surgical risk, with very simple operation and low surgical difficulty.

[0020] Effect 2: After the intraoperative implantation of the patch in the stent system for repairing visceral aortic dissection ruptures of the present invention, it does not completely cover the affected visceral arteries. After the implantation of the patch, the affected visceral arteries can still be temporarily supplied with blood through the densely distributed small through-holes on the patch, and then the affected visceral arteries are selectively catheterized through the small through-holes. During the operation, through simple interventional means, a guide wire, balloon, stent, etc. are sent to open the stent to cover the visceral area arteries, facilitating the reconstruction of the branch vessels covered by the patch. Generally, only one visceral artery opening is covered and reconstructed during the operation, greatly saving the operation time, without the need to reconstruct 4 important branches in the visceral area, greatly reducing the surgical difficulty, and can be widely promoted and applied. General hospitals can also promote this technology.

[0021] Effect 3: The honeycomb-opening patch structure slows down the blood flow at the rupture and in the false lumen. The hairy or filamentous structure on the outer layer of the patch further promotes thrombus formation at the rupture and in the false lumen. At the same time, during the operation, the false lumen can be embolized either by sending a guide wire catheter through the small holes or by leaving a catheter through other ruptures, further promoting the closure of the false lumen.

[0022] Effect 4: The bare stent is a self-expanding metal stent structure with a diameter in the range of 16 mm - 36 mm and a length in the range of 60 mm - 100 mm, adapting to the morphology of visceral area blood vessels. The front end of the bare stent is provided with double metal markers corresponding to the two edge points where the patch is sutured and fixed on the stent, so as to facilitate confirming that the position of the patch exactly covers the rupture position when the front end of the bare stent is just opened during the operation. If necessary, a certain rotation can be made to ensure the correct position; at the same time, due to the blood can pass through the bare stent structure without resistance, there is no risk of front-back displacement caused by blood flow impact when the patch system is released. This design can ensure both the lateral alignment of the patch and the longitudinal alignment of the stent. Ensure that the patch can accurately cover the rupture without covering other non-affected visceral blood vessels. The bare stent can also expand the true lumen, compress and partially eliminate the false lumen, and does not affect the blood supply of other blood vessels in the covered area. Description of the Drawings:

[0023] Figure 1 is the existing human blood vessel distribution map;

[0024] Figure 2 is the schematic diagram of visceral aortic dissection;

[0025] Figure 3 is a perspective view of the stent system of the present invention;

[0026] Figure 4 is a plane expansion view of the stent system of the present invention;

[0027] Figure 5 is a top view of the stent system of the present invention;

[0028] Figure 6 is a production schematic diagram of the stent system of the present invention;

[0029] Figure 7 is a schematic diagram of the stent system of the present invention being installed on a conveyor during surgery;

[0030] Figure 8 is a schematic diagram of the stent system being sent to the position of the dissection tear using a conveyor during surgery;

[0031] Figure 9 is a schematic diagram of partial release of the stent system during surgery;

[0032] Figure 10 is a schematic diagram of complete release of the stent system during surgery;

[0033] Figure 11 is a schematic diagram of using a small through - hole on the patch to input a guide wire into the branch blood vessel that needs to be reconstructed by the stent system during surgery;

[0034] Figure 12 is a schematic diagram after the stent system reconstructs the branch blood vessel using the small through - hole during surgery;

[0035] Figure 13 is a schematic diagram of using a small through - hole on the patch to embolize the tear and false lumen by the stent system during surgery. Specific embodiments:

[0036] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] Embodiment 1:

[0038] As Figures 3 to 5 shown, this embodiment provides a stent system for repairing the tear of the aortic dissection in the visceral area, including a bare stent 1 and a patch 2 sutured on the outer surface of the bare stent 1. The patch 2 is used to block the aortic dissection tear or endoleak. It is characterized in that: a honeycomb - shaped opening area is provided on the patch 2, and a plurality of small through - holes 4 are arranged in the honeycomb - shaped opening area. The diameter of the small through - holes 4 is in the range of 1 mm - 2 mm, and the distance between adjacent two small through - holes 4 is in the range of 1 mm - 2 mm. A metal suture 4 is arranged around the edge of the patch 2 to visualize the position of the patch 2 during surgery.

[0039] Preferably, a bimetallic marker 3 is also provided at the front end of the bare stent 1. The bimetallic marker 3 corresponds to two edge points where the patch 2 is sutured and fixed on the stent, so as to develop the position of the bare stent 1 during the operation. The dual positioning functions of the metal marker 3 + the metal suture 4 arranged around the edge of the patch 2 (front-end alignment + boundary development) are clarified, which is different from the single development design of the existing patents. It is convenient to adjust the position of the patch 2 during the operation. The bimetallic marker 3 is provided at the front end of the bare stent 1 to determine the position of the patch 2 when the stent is partially opened, and it can be rotated to a certain extent according to the position of the tear; a metal suture is wound around the edge of the patch 2, which is convenient for developing the image during the operation and positioning the boundary of the patch. Thus, the accurate positioning of the patch position during the operation can also be achieved, so as to realize the real-time adjustment of the patch position during the operation, ensure accurate coverage of the dissection tear without covering other non-affected vascular openings, and the non-affected vascular openings refer to the visceral branch vessels far from the dissection tear.

[0040] Preferably, when the patch 2 is unfolded into a plane, it is rectangular or square, and the honeycomb-shaped opening area is an array of several rows of small through holes 4.

[0041] Preferably, the width H of the patch 2 ranges from 20 mm to 30 mm, and the length L1 ranges from 40 mm to 60 mm.

[0042] Preferably, the diameter of the bare stent 1 ranges from 16 mm to 36 mm, and the length L2 ranges from 60 mm to 100 mm.

[0043] Preferably, the patch 2 is sutured at the middle position of the bare stent 1, and the bare stent 1 refers to a vascular stent without an outer membrane.

[0044] Preferably, the bare stent 1 is a skeleton woven from nitinol alloy. The inner layer of the patch 2 is made of ePTFE expanded polytetrafluoroethylene or PET polyester, and the outer layer of the patch 2 can be provided with hair or filamentous structures to prevent edge leakage and further slow down the blood flow in the false lumen, and promote the formation of thrombus in the false lumen.

[0045] Preferably, the range of the circumferential angle α corresponding to the patch 2 is from 60 degrees to 120 degrees.

[0046] The present invention adopts a combined design of a bare stent 1 + a patch 2. The patch 2 is provided with a honeycomb-shaped opening area, and a plurality of small through-holes 4 are arranged in the honeycomb-shaped opening area. The essential difference from the prior art of "single hole" is highlighted, and its technical effect is prominent. The diameter of the small through-holes 4 ranges from 1 mm to 2 mm, which can not only slow down the blood flow in the tear and the false lumen, but also retain the interventional channel, facilitating the intraoperative reconstruction of the affected blood vessels and the subsequent operation of performing false lumen embolization. Even if the patch 2 covers the branch vessels, due to the arrangement of a plurality of small through-holes 4 in the honeycomb-shaped opening area, the diameter of the small through-holes 4 ranges from 1 mm to 2 mm, and the distance between adjacent two small through-holes 4 ranges from 1 mm to 2 mm. It is ensured that at least several small through-holes 4 are communicated with the covered branch vessels, ensuring the blood supply of the covered branch vessels, retaining the interventional channel, facilitating the intraoperative reconstruction of the affected blood vessels and the subsequent operation of performing false lumen embolization, without precise alignment.

[0047] It is allowed to super-select the visceral artery through the small through-holes 4 after implanting the patch 2 during the operation, avoiding complete coverage of the branch vessels; during the operation, through simple interventional means, a guide wire, balloon, stent, etc. are sent to open the visceral artery in the area covered by the patch 2. The structure of arranging a plurality of small through-holes 4 in the honeycomb-shaped opening area slows down the blood flow in the tear and the false lumen, and the outer layer with hair or filamentous structure further promotes the formation of thrombus in the tear and the false lumen. At the same time, during the operation, a guide wire catheter can also be sent through the small holes or other tears to perform false lumen embolization, further promoting the closure of the false lumen.

[0048] Due to the adoption of the bare stent 1, it is possible to avoid covering and blocking multiple branch vessels in the visceral area as much as possible, even if the patch 2 covers 1 - 2 of the branch vessels; during the operation, through simple interventional means of arranging a plurality of small through-holes 4 in the honeycomb-shaped opening area, a guide wire, balloon, stent, etc. are sent to reconstruct and open the visceral artery in the area covered by the patch 2.

[0049] The present invention adopts a combined design of a bare stent 1 + a patch 2, which has better hemodynamic optimization, good positioning accuracy, and greatly reduces the surgical difficulty. The false lumen embolization is carried out by using a plurality of small through-holes 4 arranged in the honeycomb-shaped opening area to reconstruct the branch vessels in the affected visceral area, and generally only one visceral artery needs to be reconstructed, greatly reducing the surgical difficulty and the operation time. The traditional four-branch vessel opening procedure takes more than 5 - 7 hours and costs more than 500,000 yuan. However, for the repair operation of the aortic dissection incision in the visceral area using the present invention, it can be basically completed in 1 - 2 hours, the cost is also significantly reduced, and the surgical risk is greatly reduced (because only 1 - 2 covered branch vessels need to be reconstructed).

[0050] Such as Figure 6 - Figure 11As shown in the figure, the following is the surgical process using a stent system for repairing the rupture opening of the aortic dissection in the visceral area of the present invention: The patch 2 is fixed to the outer surface of the nitinol braided bare stent by biocompatible sutures; the diameter of the bare stent ranges from 16 mm to 36 mm, and the length ranges from 60 mm to 100 mm, adapting to the morphology of the visceral area blood vessels, as shown in Figure 6 the figure.

[0051] Taking the repair of the dissection rupture opening near the right renal artery opening as an example to illustrate the surgical process and diagram of this patch system:

[0052] 1. Select a suitable patch 2 specification according to the measurement of preoperative CTA

[0053] 2. During the operation, perform angiography to confirm the aortic right rupture opening above the right renal artery opening.

[0054] 3. Send the patch system along the guide wire. The two marking points on the positioning ring of the delivery device are facing up and down on the right side, as shown in Figure 7 、 Figure 8 the figure. Keep the angle unchanged and send the delivery device into the aorta. Under fluoroscopy, it can be seen that the marking line of the patch 2 covers the dissection rupture opening area.

[0055] 4. Withdraw the outer sheath of the delivery device about 5 mm - 10 mm. The leading edge of the bare stent 1 is released and partially deployed. At this time, it can be seen that the two metal markers 3 corresponding to the patch position are exactly located on the side up and down, indicating that the patch is on the side of the aorta. If the angle is not satisfactory, a certain angle of rotation can be made until the double metal markers 3 are on the right side to ensure that the patch is located on the right side of the aorta after release, as shown in Figure 9 the figure.

[0056] 5. Continue to withdraw the outer sheath of the delivery device, and the patch is gradually released. At this time, it can be seen that the patch completely covers the rupture opening position up, down, left and right, as shown in Figure 10 the figure, and covers the right renal artery opening. Since the blood flow can easily pass through the bare stent structure, there is no risk of displacement of the stent and the patch caused by blood flow impact during the release process.

[0057] 6. Completely release the patch 2 and the bare stent 1. At this time, the rupture opening and the right renal artery opening are covered by the patch. The right renal artery is supplied with blood through multiple small through holes distributed in a honeycomb shape on the patch. The blood flow in the rupture opening and the false lumen significantly slows down, and the blood flow in the superior mesenteric artery, celiac trunk artery, and left renal artery is not affected.

[0058] 7. Send a guide wire through the small through hole 4 in the right renal artery opening area to the distal end of the right renal artery, as shown in Figure 11 the figure. Implant a balloon-expandable bare stent or a covered stent to reconstruct the right renal artery to its normal size, as shown in Figure 12 the figure.

[0059] 8. Insert a catheter through the honeycomb-shaped small holes in the rupture area into the false lumen through the rupture or insert a catheter into the false lumen through other ruptures, and insert a coil to embolize the rupture and the false lumen, as shown in Figure 13 shown.

[0060] 9. Confirm the surgical effect by angiography and treat other aortic diseases.

[0061] Summary: The design of the present invention solves the dilemma of simultaneously repairing multiple visceral arteries in the repair of visceral area ruptures through the honeycomb-shaped porous patch structure. Combined with the precise positioning system, it is significantly superior to the prior art. The patch design with honeycomb-shaped openings of the present invention can be applied to the repair of visceral ruptures. Through multiple small through-holes distributed in a honeycomb shape, the rupture can be repaired, the blood flow in the false lumen can be restricted, and the blood supply to the blood vessels in the affected visceral area can be ensured at the same time. Through corresponding interventional operations, the blood vessels in the affected visceral area can be safely reconstructed and the dissection rupture can be repaired at the same time.

[0062] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A stent system for repairing a visceral aortic dissection rupture, comprising a bare stent (1) and a patch (2) sutured to the outer surface of the bare stent (1), wherein the patch (2) is used to block the aortic dissection rupture or internal leakage, and is characterized in that: The patch (2) is provided with a honeycomb-shaped opening area, in which a plurality of small through holes (4) are provided, the diameter of the small through holes (4) is in the range of 1 mm to 2 mm, the spacing between two adjacent small through holes (4) is in the range of 1 mm to 2 mm, and a metal suture (5) is provided around the edge of the patch (2) so as to visualize the position of the patch (2) during surgery.

2. A stent system for repairing visceral aortic dissection according to claim 1, characterized in that: A bimetallic marker (3) is also provided at the front end of the bare stent (1), and the bimetallic marker (3) corresponds to two edge points where the patch (2) is sutured and fixed on the stent, so as to visualize the position of the bare stent (1) during surgery.

3. A stent system for repairing visceral aortic dissection according to claim 2, characterized in that: When the patch (2) is unfolded into a plane, it is rectangular or square, and the honeycomb opening area is a plurality of rows of small through holes (4) arranged in an array.

4. A stent system for repairing visceral aortic dissection according to claim 1, 2 or 3, characterized in that: The width H of the patch (2) is in the range of 20 mm to 30 mm, and the length L1 is in the range of 40 mm to 60 mm.

5. A stent system for repairing visceral aortic dissection according to claim 4, characterized in that: The diameter of the bare stent (1) is in the range of 16mm-36mm, and the length L2 is in the range of 60mm-100mm.

6. A stent system for repairing visceral aortic dissection according to claim 5, characterized in that: The patch (2) is sutured to the middle part of the bare stent (1), wherein the bare stent (1) refers to a vascular stent without an external coating.

7. A stent system for repairing visceral aortic dissection according to claim 6, characterized in that: The bare stent (1) is made of a skeleton woven from nickel-titanium alloy, the inner layer of the patch (2) is made of ePTFE expanded polytetrafluoroethylene or PET polyester, and the outer layer of the patch (2) can be a hairy or filamentous structure to prevent edge leakage and further slow down the blood flow in the false lumen, thereby promoting the formation of false lumen thrombosis.

8. A stent system for repairing visceral aortic dissection according to claim 4, characterized in that: The circumferential angle α corresponding to the patch (2) is in the range of 60 degrees to 120 degrees.

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