Intraaortic Shunt

Abstract

The present invention discloses an intracavitary aortic shunt, comprising a tubular main body stent, the main body stent comprising a tubular main body coating, a main body support frame fixed on the wall surface of the main body coating, a main cavity and at least one sub-cavity are separated in the axial direction by a separation coating in the main body stent, a main cavity opening is provided at the distal end of the main cavity, and a sub-cavity opening is provided at the distal end of the sub-cavity. The shunt structure of the present invention is not prone to internal leakage and displacement, simplifies surgical operation, reduces surgical difficulty and risk, and has a wide range of applications.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and relates to a shunt and a covered stent thereof, and in particular to an intracavitary aortic shunt. Background Art

[0002] Aortic aneurysm refers to the local or diffuse abnormal expansion of the aortic wall, which compresses the surrounding organs and causes symptoms. The main danger is aneurysm rupture. It often occurs in the ascending aorta, aortic arch, thoracic descending aorta, thoracoabdominal aorta and abdominal aorta. Aortic aneurysms can be divided into true aortic aneurysms and false aortic aneurysms according to their structure. Aortic aneurysms cause increased pressure inside the blood vessels, so they expand progressively. If they develop for a long time, they will eventually rupture. The larger the aneurysm, the greater the possibility of rupture. According to statistics, if no surgical treatment is performed, 90% of thoracic aortic aneurysms will die within 5 years, and 3 / 4 of abdominal aortic aneurysms will die within 5 years.

[0003] Aortic dissection is another serious cardiovascular disease. Aortic dissection refers to the destruction of the thoracic aortic media, bleeding in the vessel wall, and blood entering the space between the media and adventitia of the vessel wall. Due to the impact of blood flow, once aortic dissection is formed, the tear can extend along the direction of blood flow, the dissection and false lumen expand, and compress the true lumen. Therefore, the possible dangers for patients with aortic dissection include: (1) the threat of complete rupture of the blood vessel. Once the blood vessel ruptures completely, the mortality rate is extremely high; (2) the dissection gradually expands and compresses the true lumen, reducing the blood supply to the distal end of the blood vessel. In most cases, aortic dissection is secondary to thoracic aortic aneurysm, or exists simultaneously with aortic aneurysm.

[0004] Aortic diseases may involve branch arteries. Once branch arteries are involved, it will be difficult to solve them through interventional methods. At present, intra-arterial treatment has been carried out at home and abroad, that is, a minimally invasive method is used to insert a graft, i.e., an arterial stent graft, into the diseased artery with the help of a vascular lumen to treat arterial diseases and improve blood supply, thereby achieving the purpose of treatment. The intra-vascular arterial stent graft is composed of a tubular rigid wire stent and an artificial blood vessel fixed on the outside of the stent. The tubular rigid wire stent is made of elastic rigid wire that is folded in a Z shape to form a ring, and then multiple rings are sutured or bonded to the artificial blood vessel to form a tubular stent graft. When used, the arterial stent graft is axially compressed and loaded into a conveyor, which is then delivered to the diseased artery through the smaller femoral artery, iliac artery, and brachial artery and then released. Due to the elastic force of the metal wire stent, it automatically returns to a straight tube and clings to the inner wall of the aorta, isolating the arterial diseased part from the blood flow, thereby achieving the purpose of treatment.

[0005] Limited by the current stent structure, existing products involving the treatment of arterial branches have inevitable problems, resulting in the risk of complications during or after treatment. The specific analysis is as follows:

[0006] 1. Chimney bracket

[0007] The "chimney" technique, also known as the parallel stent technique, refers to inserting a stent into the blocked branch vessel and releasing it in parallel with the main stent in the aorta, so as to achieve the purpose of retaining the arch branch. According to the location of the stent, it can be divided into the subclavian artery "chimney", the carotid artery "chimney" and the brachiocephalic artery "chimney", and according to the number of stents, it can be divided into "single chimney", "double chimney" and "triple chimney". The advantages of the "chimney stent" technology are: the surgical instruments used are all conventional instruments, which are easy to obtain clinically; the technical difficulty is relatively low; in the selection of appropriate cases, the incidence of endoleak is low and the blocking effect is good. Its disadvantages are: there is a "groove" between the small stent and the main aortic stent, which is not a perfect blocking technique and there is a risk of endoleak; on the other hand, the main aortic stent is released in parallel with the small stent, and the main stent may compress the small stent, causing poor blood flow or even blockage of the small stent.

[0008] 2. Window bracket

[0009] The existing "fenestrated stents" mainly include intraoperative in situ fenestration and customized fenestration. In situ fenestration is to first place the aortic main stent to cover the lesion and pre-fenestrated blood vessels, and then introduce the fenestration device (such as hard-tipped guidewire, laser, radiofrequency, etc.) into the pre-fenestrated branch blood vessels to puncture the aortic stent, and then assist the balloon and stent to open the branch blood vessels. The in situ fenestration operation is complicated and has certain requirements on the doctor's surgical level. In addition, the durability and long-term fatigue resistance of the implanted stent are poor, and it is easy to have internal leakage. The pre-fenestrated stent is individually manufactured by the stent manufacturer. Through the results of preoperative imaging examinations, stents that meet the anatomical morphology of the aortic arch of different patients are manufactured. Therefore, this type of stent has good support, adhesion, and positioning capabilities, but customized stents require a certain period of time and are not suitable for emergency cases. In addition, the production of the stent needs to take into account the curvature of the aortic arch, the relative position of the opening of the large blood vessel branches on the arch, the location of the lesion, the marking of the window, the positioning of the stent and other technical details.

[0010] 3. Integrated branch bracket

[0011] The integrated branch stent can avoid the "groove" caused by the implantation of the chimney stent, and can avoid problems such as internal leakage caused by poor window alignment. It has better adhesion and less chance of internal leakage. However, due to multiple technical problems such as branch stent delivery, introduction, positioning, and release, there is still no mature and applicable stent product on the market. Summary of the invention

[0012] The technical problem to be solved by the present invention is to provide an intraluminal aortic shunt that is not prone to internal leakage and displacement, simplifies surgical operations, reduces surgical difficulty and risks, and is adaptable to a wide range of conditions, in view of the defects of the prior art.

[0013] The technical solution adopted by the present invention to solve its technical problem is:

[0014] An intraluminal aortic shunt comprises a tubular main body support, wherein the main body support comprises a tubular main body coating and a main body support frame fixed on the wall surface of the main body coating, wherein a main cavity and at least one sub-cavity are separated axially in the main body support by a separation coating, a main cavity opening is provided at the distal end of the main cavity, and a sub-cavity opening is provided at the distal end of the sub-cavity.

[0015] Furthermore, in the aortic intraluminal shunt, preferably, a transverse end coating is provided at least between the distal end of the main body coating and the separation coating, and the transverse end coating connects the main body coating and the separation coating together.

[0016] Furthermore, in the aortic intraluminal shunt, preferably in the axial direction, the main cavity opening, the sub-cavity cavity opening and the end surface of the main body coating are flush at least at the distal end;

[0017] Alternatively, at least one of the main cavity opening and the sub-cavity opening is higher or lower than the end surface of the main body coating.

[0018] Furthermore, in the aortic intraluminal shunt, preferably at least one of the main cavity and the sub-cavity has a cylindrical extended coating extending from the lateral end coating toward the distal direction.

[0019] Furthermore, in the aortic intraluminal shunt, the extended coating end surface preferably forms a main cavity opening, and the main cavity opening is higher, lower or flush with the main body coating end surface;

[0020] Or / and the extended coating end surface form a sub-cavity opening, and the sub-cavity opening is higher, lower or flush with the main coating end surface.

[0021] Furthermore, in the aortic intraluminal shunt, the inner wall or outer wall of the extended coating is preferably provided with an extended support frame for supporting the extended coating.

[0022] Furthermore, in the aortic intraluminal shunt, the transverse end coating is preferably a planar structure perpendicular to the central axis of the main stent;

[0023] Or the transverse end coating is an inclined structure that is not perpendicular to the central axis of the main support;

[0024] Alternatively, the transverse end coating includes at least one plane structure and at least one inclined plane structure, and the plane structure and the inclined plane structure are an integral structure or are connected together to form a whole.

[0025] Furthermore, in the aortic intraluminal shunt, the main cavity opening is preferably higher than the sub-cavity opening, and the transverse end covering is a slope structure, which is inclined from the main cavity to the sub-cavity.

[0026] Furthermore, in the aortic intraluminal shunt, the inclined surface structure is preferably inclined from the outer edge of the main cavity opening or the tangent of the outer wall of the extended coating or outside the tangent toward the sub-cavity; or the inclined surface structure is inclined from the intersection of the main cavity opening and the main body coating toward the sub-cavity.

[0027] Furthermore, in the aortic intraluminal shunt, preferably, a gap is left between the axial projections of the main cavity opening, the sub-cavity opening and the main stent;

[0028] Or at least two of the axial projections of the main cavity opening, the sub-cavity opening and the main body support are arranged adjacent to each other without gap;

[0029] Alternatively, the main cavity opening is composed of the side wall of the main support and the separation coating.

[0030] Furthermore, in the aortic intraluminal shunt, preferably, the main cavity opening and the sub-cavity openings are respectively provided with developing points for displaying the positions of the cavity openings of the shunt during surgery.

[0031] Furthermore, in the aortic intraluminal shunt, the developing point is preferably an annular developing support ring; or the developing point is spaced apart in a circle along the radial direction.

[0032] The shunt of the present invention can access the branch blood vessel from the distal sub-cavity, without strictly controlling the axial position and circumferential angle of the main stent, and without worrying about the adverse consequences caused by the blood flow opening of the stent side wall and the branch blood vessel opening of the human body being blocked due to inaccurate alignment, thus simplifying the surgical procedure and reducing risks.

[0033] In addition, the opening of the sub-cavity can be located on the transverse end coating at the distal end of the main vascular stent. The transverse end coating can guide the traction guidewire when the branch vessel is accessed, so that the traction guidewire can enter the sub-cavity more quickly and complete the positioning of the branch vessel before implantation.

[0034] The aortic shunt of the present invention is used to reconstruct lesions involving important aortic branches through an intraluminal interventional method, which can solve aortic arch aneurysms, dissections, and aortic aneurysms in the visceral artery region. When the aortic shunt is used, it can be first placed in the proximal end of the affected branch artery. For example, for type A dissections or aortic arch aneurysms involving the branches above the arch, it can be placed in the ascending aorta, and then a connection channel with the aortic shunt is established through the carotid artery and the femoral artery, respectively, and the branch artery is reconstructed by bridging the main stent with the branch blood vessels. For another example, for thoracic and abdominal aortic aneurysms involving the visceral arteries or renal arteries, the shunt can be placed in the descending aorta above the celiac artery, and at the same time bridged with the superior mesenteric artery, the right renal artery and the left renal artery through the branch blood vessels, thereby achieving the reconstruction of important branches and the isolation of aneurysms.

[0035] The aortic shunt of the present invention has a wide range of applications and can simplify surgical operations and reduce surgical risks. It is particularly suitable for intravascular treatment of aortic dissection and / or aortic aneurysm involving important branches. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0037] Figure 1a-1b This is a schematic diagram of the structure of the aortic intraluminal shunt in Example 1;

[0038] Figure 2a This is a schematic diagram of the structure of the annular main body support frame of Example 1;

[0039] Figure 2b This is a schematic diagram of the connection between the annular main body support frame and the main body covering film in Example 1;

[0040] Figure 3 -4d is a schematic diagram of the structure of the distal end surface structure of Example 1 in different implementation modes;

[0041] Figure 5a-5b This is a schematic diagram of the structure of the aortic intraluminal shunt in Example 2;

[0042] Figure 6a This is a schematic diagram of the structure of the aortic intraluminal shunt of Example 3;

[0043] Figure 6b This is a schematic diagram of another implementation method of Example 3;

[0044] Figure 7 This is a schematic diagram of the structure of Example 4. DETAILED DESCRIPTION

[0045] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0046] Definition of orientation: The proximal end in the present invention refers to the end close to the heart, and the distal end refers to the end far from the heart. The high and low mentioned in the present invention are relative to the main body coating. The end surface beyond the main body coating is called high, and the end surface that does not exceed the main body coating is called low. This definition is only for the convenience of expression and does not limit the direction of the shunt and the stent itself.

[0047] Embodiment 1, as Figure 1a-1b As shown, an aortic intraluminal shunt includes a tubular main body support 101, wherein the main body support 101 includes a tubular main body coating 120 and a main body support frame 110 fixed on the wall of the main body coating 120, the inner cavity of the main body support 101 is axially separated into a main cavity 140 and at least one sub-cavity 130 by a separating coating 131, the main cavity 140 is provided with a main cavity opening 171 at the distal end, and the sub-cavity 130 is provided with a sub-cavity opening 172 at the distal end.

[0048] The main support 101 is the main structure of the intracavitary shunt, including a main coating 120 and a main support frame 110. The main coating 120 is a tubular structure, and its transverse end surface shape is circular or elliptical to match the blood vessel.

[0049] The main body support frame 110 is sewn onto the main body covering film 120. The main body support frame 110 has multiple implementation modes: The first implementation mode of the main body support frame 110: Figure 2a As shown, the main support frame 110 is a plurality of annular corrugated support frames arranged axially, and the annular corrugated support frames can be equal-height wave supports, high-low wave supports, etc. The structures used for the stent graft are applicable to the present invention. No further description is given here. In this embodiment, Figure 2a-2b As shown, the main support frame 110 is composed of a plurality of Z-shaped or sine waves, each Z-shaped or sine wave has a crest 111 and an adjacent trough 112, and there is a connecting rod 113 between the crest 111 and the adjacent trough 112. Each ring-shaped main support frame 110 is woven with a superelastic nickel-titanium wire, and the wire diameter (i.e., diameter) of the superelastic nickel-titanium alloy wire can be selected in the range of 0.3mm to 0.55mm. In the first embodiment, a nickel-titanium wire with a diameter of 0.5mm is woven, the number of Z-shaped or sine waves is 9, and the vertical height of the ring-shaped support body bracket is 11mm. There is a connecting steel sleeve 114 on each ring-shaped main support frame 110, and the two end points of the nickel-titanium wire are inside the connecting steel sleeve 114, and then the two end points of the nickel-titanium wire are fixed inside the steel sleeve by mechanical compression or welding.

[0050] The second embodiment of the main support frame 110 is a woven mesh structure or a cut mesh structure. This structure is also a common structure and will not be described in detail here.

[0051] The main body coating 120 is made of polyester cloth or other polymer materials. The main body coating 120 is straight in the axial direction. The main body support frame 110 is sutured on the main body coating 120 by sutures 150. The main body support frame 110 and the coating 120 are made of polyester cloth or other polymer materials. Figure 2b The suture 150 is connected along the wave shape of the main support frame 110, and the suture 150 sews the main support frame 110 to the covering film 120 through a plurality of suture knots distributed at non-equidistant intervals. The diameter of the suture 150 is selected in the range of 0.05 mm to 0.25 mm. In this embodiment, the diameter of the suture 150 is 0.1 mm.

[0052] like Figure 1a-1b As shown, the distal inner cavity of the main stent 101 is divided into a multi-cavity structure, that is, the inner cavity of the main stent 101 is divided into a main cavity 140 and at least one sub-cavity 130 in the axial direction by the separation coating 131. Generally, the sub-cavity is independently enclosed by the separation coating 131, and the cavity between the separation coating 131 and the main coating is the main cavity 140. This design can reduce the overall diameter of the stent in the clamping state and can reduce the diameter of the sheath used to assemble the delivery system. The diameter of the main cavity 140 is larger than the diameter of the sub-cavity 130, and the number of sub-cavities 130 can be set according to actual needs, generally 1-4, preferably 2-4. The cross-end surface shapes of the main cavity 140 and the sub-cavity 130 are circular, elliptical, shuttle-shaped or irregularly curved. In this embodiment, a circular main cavity 140 and two circular sub-cavities 130 are provided.

[0053] like Figure 1a-1b As shown, a coating for connecting and closing the inner cavity is provided between the separation coating 131 and the main body coating 120. That is, a transverse end coating 180 is provided at least between the distal end of the main body coating 120 and the separation coating 131, and the transverse end coating 180 connects the main body coating 120 and the separation coating 131 together and closes the main cavity 140, that is, the gap between the main support 101 and the sub-cavity 130. The transverse end coating 180 is at least provided at the distal end of the main body coating 120, and can also be provided at both the proximal end and the distal end of the main body coating 120. The transverse end coating 180 is radially arranged or approximately radially arranged relative to the main body coating 120 and the separation coating 131.

[0054] The transverse end coating 180 is a structure for transverse closure. There are many implementations, and this embodiment is the first implementation: the transverse end coating 180 is a planar structure perpendicular to the central axis of the main support 101. The transverse end coating 180 is located at the distal end of the main coating 120 and is sutured together with the main coating 120 by suturing.

[0055] like Figure 1a-1bAs shown, the main cavity opening 171 is an opening for connection provided at the distal end of the main cavity 140, and its diameter is smaller than the diameter of the main body coating, and is generally larger than the cavity diameter of the sub-cavity 130. The sub-cavity opening 172 is provided at the distal end of the sub-cavity 130, and the diameter of the sub-cavity opening 172 can be smaller than the diameter of the sub-cavity 130, or can be the same as the diameter of the sub-cavity 130. In this embodiment, the diameter of the sub-cavity opening 172 is selected to be the same as the diameter of the sub-cavity 130. The main cavity opening 171 is formed by opening it on the transverse end coating 180.

[0056] In this embodiment, the main cavity opening 171 and the sub-cavity opening 172 are arranged on the transverse end coating 180. The main cavity opening 171 and the sub-cavity opening 172 have different positional relationships with each other. The first embodiment is: a gap is left between the axial projections of the main cavity opening 171, the sub-cavity opening 172 and the main body support; the second embodiment is: at least two of the axial projections of the main cavity opening 171, the sub-cavity opening 172 and the main body support are arranged close to each other without a gap; the third embodiment is: the main cavity opening 171 is composed of the side wall of the main body support and the partition coating 131 at the same time. Similarly, the main cavity opening 171 and the sub-cavity opening 172 have different positional relationships in the radial direction, for example: Figure 4b-4c As shown, the main cavity opening 171 can be set at the radial center of the distal end of the stent, and can also be set as shown in FIG. Figure 3-4a As shown, the main cavity opening 171 is arranged near the main body covering film 120, and the sub-cavity openings 172 are dispersedly distributed around the main cavity opening 171 or concentratedly arranged on one side of the main cavity opening 171. Figure 3 As shown, the sub-cavity opening 172 is arranged close to the main cavity opening 171. Figure 4b-4c As shown, the sub-cavity opening 172 is evenly and symmetrically arranged around the outer side of the main cavity opening 171. Figure 4d As shown, only one sub-chamber opening 172 is arranged close to the main chamber opening 171 .

[0057] In the axial direction, the main cavity opening 171 and the sub-cavity opening 172 have different implementations, and this embodiment is the first implementation: the main cavity opening 171, the sub-cavity opening 172 and the end surface of the main body coating are at least flush at the distal end; that is, the main body coating 120 and the separation coating 131 have the same length in the axial direction, that is, the end surface of the separation coating 131 is flush with the end surface of the main body coating 120 at the proximal end or / and the distal end. In this embodiment, the main cavity opening 171 and the sub-cavity opening 172 are opened on the transverse end coating 180.

[0058] The main cavity opening 171 can be limited by sutures, or an annular support frame can be further provided. The structure of the annular support frame can adapt to the shape of the cavity opening, such as a circle, to prevent the sub-main cavity opening 171 from deforming after the main cavity 140 is compressed. The proximal end of the sub-cavity 130 and the distal sub-cavity opening 172 can also be sutured with sutures, or an annular support, or a circular ring and / or annular support can be used to support the sub-cavity opening 172. The separation coating 131 of the circumferential sub-cavity 130 extends from the distal end, i.e., the sub-cavity opening 172, to the proximal end to form a tubular structure. A support frame can be fixedly provided on the outer surface or inner surface of the separation coating 131. The support frame is an annular support coating stent or a woven mesh stent.

[0059] In order to facilitate the surgical operation, the main cavity opening 171 and the sub-cavity opening 172 are respectively provided with developing points for displaying the positions of the various cavity openings of the shunt during the operation. The developing points are selected from developing materials. Specifically, it is preferred that the developing point is an annular developing support ring; the supporting ring is preferably a superelastic material with developing properties. The developing points are spaced a plurality of times along a circle in the radial direction.

[0060] Embodiment 2, as Figure 5a As shown, this embodiment is an improvement on the basis of the embodiment 1. That is, the difference is that the transverse end coating 180 is a second embodiment: the transverse end coating 180 includes at least one plane structure 181 and at least one inclined surface structure 182, that is, the transverse end coating 180 is a combination of the plane structure 181 and the inclined surface structure 182. The combination is that the plane structure 181 and the inclined surface structure 182 are an integral structure or they are connected together to form a whole. Due to the existence of the inclined surface structure 182, at least one of the main cavity opening 171 and the sub-cavity cavity opening 172 is higher or lower than the end surface of the main coating.

[0061] Regarding the inclined surface structure 182, when the end surface of the main cavity 140 is higher than the end surface of the sub-cavity 130, the inclined surface structure 182 is inclined from the main cavity 140 to the sub-cavity 130. That is, the main cavity opening 171 is higher than the sub-cavity opening 172. According to the different positions where the inclination starts, the inclined surface structure 182 can be inclined from the outer edge of the main cavity opening 171 or the tangent of the extended outer wall of the coating or outside the tangent to the sub-cavity 130; the inclined surface structure can also be inclined from the intersection of the main cavity opening 171 and the main body coating to the sub-cavity 130. Figure 5aAs shown, this embodiment is inclined from the tangent of the outer edge of the main cavity opening 171 toward the sub-cavity 130. The axial length of the sub-cavity opening 172 relative to the main cavity opening 171 is 5mm. At the same time, the sub-cavity 130 is connected to the main cavity 140 and the main body coating 120 is sutured inward relative to the distal end surface of the main stent, which can further enhance the connection stability after the branch stent is introduced. The coating at the distal end of the main body coating 120 corresponding to the position of the sub-cavity opening 172 can be cut into two V-shapes or U-shapes. When the main stent 101 is used in conjunction with a small braided stent or a cuff stent or other branch stent, the visibility of the circumferential sub-cavity 130 is increased, which is more conducive to the accurate release of the branch stent.

[0062] The above structure can be applied to the distal end of the main support 101, and also to the proximal end of the main support 101. The separation coating 131 can be provided independently, or can be provided as follows: Figure 5b As shown, a support frame 132 is fixed on the wall surface of the separation film 131 .

[0063] The support frame 132 structure can be a woven mesh support frame or a plurality of annular corrugated support frames arranged axially.

[0064] The remaining structures are the same as those in Example 1 and will not be described in detail here.

[0065] Embodiment 3, as Figure 6a-6b As shown, this embodiment is an improvement on the basis of embodiment 2. That is, at least one of the main cavity 140 and the sub-cavity 130 has a cylindrical extension coating 190 extending from the transverse end coating 180 toward the distal end. The axial length of the extension coating 190 is 5-10 mm.

[0066] The extended coating 190 can be formed by directly extending the separation coating 131 in the distal direction, or can be formed by extending the opening provided on the lateral end coating 180 corresponding to the main cavity 140 in the distal direction. The end face of the extended coating 190 forms a main cavity opening 171, which is higher, lower or flush with the end face of the main coating; the end face of the extended coating forms a sub-cavity opening 172, which is higher, lower or flush with the end face of the main coating. Another is that the distal opening of the extended coating 190 is the main cavity opening 171. The sub-cavity opening 172 is the distal opening of the extended coating. Figure 6a As shown, the main cavity 140 and the sub-cavity 130 are respectively provided with extended covering films 190 .

[0067] The extended coating 190 may be provided separately or as Figure 6b As shown, the inner wall or outer wall of the extended coating 190 is provided with an extended support frame 191 for supporting the extended coating 190. The extended support frame 191 is a corrugated support frame or a braided support frame.

[0068] When the multi-lumen coated stent is used in combination with a branch stent, the extended coating 190 can further improve the connection stability between the main lumen 140 and the branch stent.

[0069] The remaining structures are the same as those in Example 2 and will not be described in detail here.

[0070] Embodiment 4, as Figure 7 As shown, this embodiment is an improvement on the basis of embodiment 2 or 3. The transverse end coating 180 is a third embodiment: the transverse end coating 180 is an inclined structure that is not perpendicular to the central axis of the main support 101; the inclined structure is inclined from the intersection of the main cavity opening 171 and the main coating 120 toward the sub-cavity. The main cavity opening is composed of the side wall of the main support and the separation coating 131, that is, the main cavity opening 171 is a structure formed by the separation coating 131 and the main coating 120, and the structure is a shuttle shape, or an oblate circle, or a semicircular shape.

[0071] The proximal and distal ends of the main body coating 120 may also be provided with a bare stent 121. The structure of the bare stent 121 uses a corrugated support frame and is fixed to the main body coating 120 by suturing.

[0072] The remaining structures are the same as those in Embodiment 2 or 3 and will not be described in detail here.

Claims

1. An intraaortic shunt, characterized in that: The main body stent comprises a tubular main body stent, the main body stent comprises a tubular main body covering, a main body support frame fixed on the wall surface of the main body covering, a main cavity and at least one sub-cavity are separated in the axial direction by the separation covering, the main cavity is provided with a main cavity opening at the distal end, and the sub-cavity is provided with a sub-cavity opening at the distal end; The sub-cavity is independently surrounded by the separation film, the main cavity is formed between the separation film and the main body film, and the diameter of the main cavity is greater than the diameter of the sub-cavity; A transverse end coating is provided at least between the distal end of the main body coating and the separation coating, and the transverse end coating connects the main body coating and the separation coating together; At least one of the main cavity and the sub-cavity has a cylindrical extended coating extending from the transverse end coating to the distal direction; the end surface of the extended coating forms a main cavity opening, and the main cavity opening is higher, lower or flush with the end surface of the main body coating; Or / and the extended coating end surface form a sub-cavity opening, and the sub-cavity opening is higher, lower or flush with the main coating end surface.

2. The aortic intraluminal shunt according to claim 1, characterized in that: An extension support frame for supporting the extended coating is disposed on the inner wall or the outer wall of the extended coating.

3. The aortic intraluminal shunt according to claim 1, characterized in that: The transverse end coating is a planar structure perpendicular to the central axis of the main support; Or the transverse end coating is an inclined structure that is not perpendicular to the central axis of the main support; Alternatively, the transverse end coating includes at least one plane structure and at least one inclined plane structure, and the plane structure and the inclined plane structure are an integral structure or are connected together to form a whole.

4. The aortic intraluminal shunt according to claim 3, characterized in that: The main cavity opening is higher than the sub-cavity opening, and the transverse end covering film is a slope structure, which is inclined from the main cavity to the sub-cavity.

5. The aortic intraluminal shunt according to claim 4, characterized in that: The inclined surface structure is inclined from the tangent of the outer edge of the main cavity opening or outside the tangent to the sub-cavity direction; or the inclined surface structure is inclined from the tangent of the outer wall of the extended coating or outside the tangent to the sub-cavity direction; or the inclined surface structure is inclined from the intersection of the main cavity opening and the main body coating to the sub-cavity direction.

6. The aortic intraluminal shunt according to claim 1, characterized in that: A gap is left between the axial projections of the main cavity opening, the sub-cavity opening and the main body support; Or at least two of the axial projections of the main cavity opening, the sub-cavity opening and the main body support are arranged adjacent to each other without gap; Alternatively, the main cavity opening is composed of the side wall of the main support and the separation coating.

7. The aortic intraluminal shunt according to any one of claims 1 to 6, characterized in that: The main cavity opening and the sub-cavity opening are respectively provided with developing points for displaying the positions of the cavity openings of the shunt during surgery.

8. The aortic intraluminal shunt according to claim 7, characterized in that: The developing point is an annular developing support ring; or the developing point is spaced apart in a circle along the radial direction.

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