Abdominal aorta covered stent and stent system

Abstract

The utility model discloses an aorta abdominalis covered stent and a stent system, and belongs to the technical field of aorta abdominalis covered stents. The utility model provides an aorta abdominalis covered stent which comprises a stent body, and a first through hole, a second through hole and a third through hole are formed in the stent body in the longitudinal direction of a cylinder. The middle section of the support body is provided with an open groove, the second through hole and the third through hole are broken through the open groove, and the first through hole is not broken through the open groove. Therefore, according to the aorta abdominalis covered stent, the aorta abdominalis stent can be communicated with the four branch arteries. The first through hole is not affected by the open groove and penetrates through the stent body, and therefore it can be guaranteed that blood in the aorta abdominalis is smooth all the time. The slotting does not need to be customized according to the condition of a patient, and professional batch production can be realized, so that the manufacturing efficiency and the use reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of abdominal aortic endovascular stent graft technology, and in particular to an abdominal aortic endovascular stent graft and stent system. Background Technology

[0002] Abdominal aortic stenting repairs aneurysms via an endovascular approach, avoiding the large incisions of traditional open surgery. This treatment uses regional anesthesia, involves traversing the aorta through the femoral artery to reach the aneurysm, and then deploying the stent graft to create a stable blood flow pathway. After stent placement, the direction of blood flow within the abdominal aorta is altered, reducing systemic pressure on the aneurysm and thus achieving the goal of treating the abdominal aortic aneurysm.

[0003] For abdominal aortic aneurysms involving the openings of branch vessels, branch stenting technology involves weaving additional small covered stents onto the main covered stent, allowing it to access the renal artery or other visceral arteries to maintain visceral blood flow. For example, a thoracoabdominal aortic covered stent disclosed in Chinese Patent Publication No. CN 118766648 A illustrates this. The thoracoabdominal aortic segment includes four branch arteries: the celiac trunk, superior mesenteric artery, left renal artery, and right renal artery. The location, size, shape, and angle of these four branch arteries vary from person to person. Therefore, in existing technologies, to connect the abdominal aortic stent to these four branch arteries, doctors often manually create openings on the abdominal aortic stent to connect them, for example, by manually chiseling out the four branch artery openings according to the patient's specific condition. However, this manual method is inefficient. Furthermore, due to differences in the processing abilities of different doctors, inappropriate processing may affect the performance of the abdominal aortic stent, resulting in low reliability.

[0004] Therefore, it is necessary to propose a new abdominal aortic endovascular stent graft that improves the efficiency of its fabrication and the reliability of its use while meeting the requirement of connecting the abdominal aorta to its four branch arteries. Utility Model Content

[0005] This invention provides an abdominal aortic endovascular stent graft and stent system, which can improve the efficiency of abdominal aortic endovascular stent graft processing and the reliability of its use.

[0006] To address the aforementioned technical problems, the first aspect of this utility model discloses an abdominal aortic endovascular stent graft, wherein the abdominal aortic endovascular stent graft, in its deployed state, comprises:

[0007] The support body 10 is a cylinder; the support body 10 has a first through hole 21, a second through hole 22 and a third through hole 23 arranged along the longitudinal direction of the cylinder.

[0008] The middle section of the support body 10 is provided with a slot 30, which interrupts the second through hole 22 and the third through hole 23, but does not interrupt the first through hole 21.

[0009] The stent body 10 is used to be embedded in the abdominal aorta, and the slot 30 is used to ensure that when the stent body 10 is embedded in the abdominal aorta, the connection points of the celiac trunk, superior mesenteric artery, left renal artery and right renal artery with the abdominal aorta are all located within the slot 30.

[0010] As an optional implementation, in the first aspect of this utility model, the slot 30 breaks the second through hole 22 and the third through hole 23, so that the second through hole 22 is divided into the upper half 22a and the lower half 22b of the second through hole, and the third through hole 23 is divided into the upper half 23a and the lower half 23b of the third through hole.

[0011] As an optional implementation, in the first aspect of this utility model, the support body 10 is a cylinder woven from metal mesh, and the surface of the support body 10 is covered with a flexible film.

[0012] As an optional implementation, in the first aspect of the present invention, the cross-sectional area of ​​the first through hole 21 is greater than the cross-sectional area of ​​the second through hole 22, and the cross-sectional area of ​​the first through hole 21 is greater than the cross-sectional area of ​​the third through hole 23.

[0013] As an optional implementation, in the first aspect of this utility model, the first through hole 21, the second through hole 22 and the third through hole 23 are all circular holes, the inner diameters of the second through hole 22 and the third through hole 23 are the same, and the inner diameter of the first through hole 21 is larger than the inner diameters of the second through hole 22 and the third through hole 23.

[0014] As an optional implementation, in the first aspect of this utility model, the centers of the first through hole 21, the second through hole 22 and the third through hole 23 are on a straight line, and the straight line is the diameter of the support body 10.

[0015] As an optional implementation, in the first aspect of this utility model, the outer diameter of the support body 10 is set to 30-40mm, the inner diameter of the first through hole 21 is set to 18-24mm, and the inner diameters of the second through hole 22 and the third through hole 23 are set to 6-8mm.

[0016] As an optional implementation, in the first aspect of this utility model, the upper half 22a of the second through hole, the lower half 22b of the second through hole, the upper half 23a of the third through hole, and the lower half 23b of the third through hole are all configured as spindle-shaped through holes with a cross-sectional area in the middle portion larger than that at both ends.

[0017] The second aspect of this utility model discloses an abdominal aortic endovascular stent graft system, which includes the abdominal aortic endovascular stent graft as disclosed in the first aspect of this utility model, and further includes:

[0018] The first sub-stent has one end coupled to the upper half of the second through hole 22a, and the other end of the first sub-stent is used to be embedded in the celiac trunk artery so that the celiac trunk artery communicates with the abdominal aorta.

[0019] The second sub-stent has one end coupled to the lower half of the second through hole 22b, and the other end is used to be embedded in the left renal artery so that the left renal artery communicates with the abdominal aorta;

[0020] The third sub-stent, one end of which is coupled to the upper half of the third through hole 23a, and the other end of which is used to be embedded in the superior mesenteric artery so that the superior mesenteric artery communicates with the abdominal aorta;

[0021] The fourth sub-stent has one end coupled to the lower half 23b of the third through-hole, and the other end is used to be embedded in the right renal artery so that the right renal artery communicates with the abdominal aorta.

[0022] The third aspect of this utility model also discloses another abdominal aortic endovascular stent graft system, which includes the abdominal aortic endovascular stent graft as disclosed in the first aspect of this utility model, and further includes:

[0023] A delivery device for delivering the abdominal aortic stent graft to a predetermined location and then releasing it.

[0024] Implementing this utility model has the following beneficial effects:

[0025] This invention provides an abdominal aortic endovascular stent graft, comprising: a stent body 10, which is cylindrical; a first through-hole 21, a second through-hole 22, and a third through-hole 23 are provided within the stent body 10 along the longitudinal direction of the cylinder; a slot 30 is provided in the middle section of the stent body 10, which interrupts the second through-hole 22 and the third through-hole 23, but does not interrupt the first through-hole 21; the stent body 10 is used to be embedded in the abdominal aorta, and the slot 30 is used to ensure that the connections of the celiac trunk, superior mesenteric artery, left renal artery, and right renal artery to the abdominal aorta are all located within the slot 30 when the stent body 10 is embedded in the abdominal aorta. Therefore, the abdominal aortic endovascular stent graft of this invention can achieve communication between the abdominal aortic stent and the aforementioned four branch arteries. The first through-hole 21 is unaffected by the slot 30 and penetrates the stent body 10, thereby ensuring unobstructed blood flow within the abdominal aorta. The 30mm groove eliminates the need for customized processing based on the patient's condition, enabling professional mass production and improving manufacturing efficiency and reliability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an abdominal aortic endovascular stent disclosed in this utility model;

[0028] Figure 2 This is a schematic diagram of the shape of the human abdominal aorta.

[0029] Figure 3 This is a cross-sectional view of an abdominal aortic endovascular stent disclosed in this utility model;

[0030] Figure 4 This is a cross-sectional view of another abdominal aortic endovascular stent disclosed in this utility model;

[0031] Figure 5 This is a cross-sectional view of another abdominal aortic endovascular stent disclosed in this utility model;

[0032] Figure 6 This is a cross-sectional view of the spindle-shaped through hole disclosed in this utility model.

[0033] In the diagram: 10 is the main body of the bracket; 21 is the first through hole; 22a is the upper half of the second through hole; 22b is the lower half of the second through hole; 23 is the third through hole; 23a is the upper half of the third through hole; 23b is the lower half of the third through hole; 30 is the slot. Detailed Implementation

[0034] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] It should be noted that, unless otherwise expressly specified and limited, the term "electrical connection" in the specification, claims, and accompanying drawings of this utility model should be interpreted broadly. For example, it can refer to a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical-electrical connection, or a connection capable of mutual communication; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two elements or the interaction between two elements. Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] This invention provides an abdominal aortic endovascular stent graft, which, based on an existing abdominal aortic endovascular stent graft, has three through-holes drilled in its longitudinal direction: a first through-hole, a second through-hole, and a third through-hole. The first through-hole is used to divert blood flow in the abdominal aorta, while the second and third through-holes are used to divert blood flow in the celiac trunk, superior mesenteric artery, left renal artery, and right renal artery. Optionally, the second through-hole is used to divert blood flow in the celiac trunk and left renal artery, and the third through-hole is used to divert blood flow in the superior mesenteric artery and right renal artery.

[0037] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an abdominal aortic endovascular stent graft disclosed in an embodiment of the present invention. Other abdominal aortic stent structures may also be connected to the upper and lower ends of the stent body 10, which is not limited here.

[0038] With the direction of blood flow in the stent body 10 (that is, along the cylindrical direction inside the stent body 10) as the longitudinal direction, a first through hole 21, a second through hole 22 and a third through hole 23 are longitudinally provided inside the stent body 10.

[0039] A slot 30 is provided in the middle section of the support body 10. The slot 30 is a notch provided on one side of the longitudinal middle section of the support body 10. Under the action of the slot 30, the second through hole 22 and the third through hole 23 are interrupted at the middle position of the support body 10, so that the second through hole 22 is divided into the upper half 22a and the lower half 22b of the second through hole; and the third through hole 23 is divided into the upper half 23a and the lower half 23b of the third through hole; but the slot 30 does not affect the first through hole 21, that is, the first through hole 21 completely penetrates the entire support body 10 without being interrupted.

[0040] The main body 10 of the support structure can be composed of a metal support and a coating material. The metal support platform material can be a nickel-titanium alloy, which is widely used due to its superelasticity and shape memory properties, or it can be 304 stainless steel. The coating material can be a polyester (such as PET, i.e., polyethylene terephthalate) or expanded polytetrafluoroethylene (ePTFE). These materials have good biocompatibility and durability.

[0041] The main structures of the human abdominal aorta are as follows: Figure 2 As shown, the abdominal aorta has many branch arteries, the larger ones including the celiac trunk, superior mesenteric artery, left renal artery, and right renal artery. Existing endovascular stent grafts for the abdominal aorta, because the lining on the stent surface obstructs blood flow, would prevent the aforementioned four branch arteries from connecting to the aorta if an unbranched endovascular stent graft were directly placed into the abdominal aorta. Furthermore, existing branch arteries require manual fabrication by physicians based on the patient's condition, resulting in low reliability and efficiency.

[0042] To facilitate blood flow between the four branch arteries and the aorta, this invention designs as follows: Figure 1 The main support body 10 in the middle. Figure 1 The position of the stent body 10 in the abdominal aorta is such that the slot 30 is directly opposite the celiac trunk and the superior mesenteric artery, and the connection points of the celiac trunk, the superior mesenteric artery, the left renal artery and the right renal artery with the abdominal aorta are all located within the slot 30.

[0043] Then according to Figure 1 The structure and placement of the stent body 10 enable communication between the abdominal aortic stent and the aforementioned four branch arteries. Simultaneously, the first through-hole 21, unaffected by the slot 30, penetrates the stent body 10, thus ensuring unobstructed blood flow within the abdominal aorta at all times.

[0044] and Figure 1 The stent body 10 no longer needs to be customized according to the patient's condition, but can be mass-produced professionally, which improves the efficiency of manufacturing and the reliability of use.

[0045] Furthermore, if corresponding arterial stents are also required for the celiac trunk, superior mesenteric artery, left renal artery, and right renal artery, the end of the arterial stent connected to the abdominal aorta can be placed in the slot 30. The slot 30 provides sufficient space to allow for the coordination between the arterial stents of the branch arteries and the stents of the abdominal aorta.

[0046] Furthermore, for the design of the first through hole 21, the second through hole 22, and the third through hole 23, the following options are available:

[0047] (1) As Figure 3 As shown: the first through hole 21, the second through hole 22, and the third through hole 23 are all circular holes. The inner diameters of the second through hole 22 and the third through hole 23 are the same, while the inner diameter of the first through hole 21 is larger than that of the second through hole 22 and the third through hole 23. The position of the first through hole 21 is slightly lower than that of the slot 30. At the slot 30, the second through hole 22 and the third through hole 23 are interrupted, while the first through hole 21 is not interrupted.

[0048] Furthermore, regarding dimensions: the outer diameter of the bracket body 10 is set to 30-40mm, the inner diameter of the first through hole 21 is set to 18-24mm, and the inner diameters of the second through hole 22 and the third through hole 23 are set to 6-8mm.

[0049] (2) Figure 4 As shown: the first through hole 21, the second through hole 22, and the third through hole 23 are all circular holes. The inner diameters of the second through hole 22 and the third through hole 23 are the same, while the inner diameter of the first through hole 21 is larger than that of the second through hole 22 and the third through hole 23. The centers of the first through hole 21, the second through hole 22, and the third through hole 23 are on a straight line, and this straight line is the diameter of the support body 10. At the slot 30, the second through hole 22 and the third through hole 23 are interrupted, while the first through hole 21 is not interrupted.

[0050] Furthermore, regarding dimensions: the outer diameter of the bracket body 10 is set to 30-40mm, the inner diameter of the first through hole 21 is set to 18-24mm, and the inner diameters of the second through hole 22 and the third through hole 23 are set to 6-8mm.

[0051] (3) Figure 5 As shown: the first through hole 21, the second through hole 22, and the third through hole 23 are through holes of arbitrary shapes. The cross-sectional area of ​​the first through hole 21 is larger than that of the second through hole 22 and the third through hole 23. The position of the first through hole 21 is slightly lower than that of the slot 30. At the slot 30, the second through hole 22 and the third through hole 23 are interrupted, while the first through hole 21 is not interrupted.

[0052] Furthermore, such as Figure 6As shown, the upper half 22a, the lower half 22b, the upper half 23a, and the lower half 23b of the second through hole are all designed as spindle-shaped through holes with a cross-sectional area in the middle that is larger than that at both ends. Therefore, the upper half 22a, the lower half 22b, the upper half 23a, and the lower half 23b of the third through hole are all spindle-shaped through holes with a larger middle section and narrower ends. This facilitates the installation of other branch supports inside the spindle-shaped through holes. Because the ends of the spindle-shaped through holes are narrower, the branch supports installed inside can be held in place and are less likely to fall off.

[0053] Furthermore, this utility model embodiment also discloses an abdominal aortic endovascular stent graft system, which includes the above-mentioned abdominal aortic endovascular stent graft, and further includes:

[0054] The first sub-stent has one end coupled to the upper half of the second through-hole 22a, and the other end of the first sub-stent is used to be embedded in the celiac trunk artery so that the celiac trunk artery communicates with the abdominal aorta.

[0055] The second sub-stent has one end coupled to the lower half of the second through-hole 22b, and the other end is used to be embedded in the left renal artery so that the left renal artery communicates with the abdominal aorta.

[0056] The third sub-stent has one end coupled to the upper half of the third through-hole 23a, and the other end is used to be embedded in the superior mesenteric artery so that the superior mesenteric artery communicates with the abdominal aorta.

[0057] The fourth sub-stent is coupled at one end to the lower half of the third through-hole 23b, and at the other end is used to be embedded in the right renal artery so that the right renal artery communicates with the abdominal aorta.

[0058] Furthermore, this utility model embodiment discloses an abdominal aortic endovascular stent graft system, including the above-mentioned abdominal aortic endovascular stent graft, and further comprising:

[0059] A delivery device is used to deliver an abdominal aortic stent graft to a predetermined location and then release it.

[0060] The above provides a detailed description of an abdominal aortic endovascular stent graft and stent system disclosed in the embodiments of this utility model. Specific embodiments have been used to illustrate the principles and implementation methods of this utility model. However, the above preferred embodiments are not intended to limit this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, based on the ideas of this utility model, there will be changes in the specific implementation methods and application scope without departing from the spirit and scope of this utility model. Therefore, the protection scope of this utility model is determined by the scope defined in the claims.

Claims

1. An abdominal aortic endovascular stent graft, characterized in that, The abdominal aortic endovascular stent graft, in its deployed state, comprises: The support body (10) is a cylinder; the support body (10) is provided with a first through hole (21), a second through hole (22) and a third through hole (23) along the longitudinal direction of the cylinder; The middle section of the bracket body (10) is provided with a slot (30), the slot (30) breaks the second through hole (22) and the third through hole (23), and the slot (30) does not break the first through hole (21); The stent body (10) is used to be embedded in the abdominal aorta, and the slot (30) is used to ensure that when the stent body (10) is embedded in the abdominal aorta, the connection points of the celiac trunk, superior mesenteric artery, left renal artery and right renal artery with the abdominal aorta are all located within the slot (30).

2. The abdominal aortic endovascular stent graft according to claim 1, characterized in that, The slot (30) breaks the second through hole (22) and the third through hole (23), so that the second through hole (22) is divided into the upper half (22a) and the lower half (22b) of the second through hole, and the third through hole (23) is divided into the upper half (23a) and the lower half (23b) of the third through hole.

3. The abdominal aortic endovascular stent graft according to claim 2, characterized in that, The support body (10) is a cylinder woven from metal mesh, and the surface of the support body (10) is covered with a flexible film.

4. The abdominal aortic endovascular stent graft according to claim 2, characterized in that, The cross-sectional area of ​​the first through hole (21) is greater than that of the second through hole (22), and the cross-sectional area of ​​the first through hole (21) is greater than that of the third through hole (23).

5. The abdominal aortic endovascular stent graft according to claim 4, characterized in that, The first through hole (21), the second through hole (22) and the third through hole (23) are all round holes. The inner diameters of the second through hole (22) and the third through hole (23) are the same, and the inner diameter of the first through hole (21) is greater than the inner diameters of the second through hole (22) and the third through hole (23).

6. The abdominal aortic endovascular stent graft according to claim 5, characterized in that, The centers of the first through hole (21), the second through hole (22) and the third through hole (23) are on a straight line, and the straight line is the diameter of the support body (10).

7. The abdominal aortic endovascular stent graft according to claim 6, characterized in that, The outer diameter of the support body (10) is set to 30-40mm, the inner diameter of the first through hole (21) is set to 18-24mm, and the inner diameters of the second through hole (22) and the third through hole (23) are set to 6-8mm.

8. The abdominal aortic endovascular stent graft according to claim 2, characterized in that, The upper half (22a) of the second through hole, the lower half (22b) of the second through hole, the upper half (23a) of the third through hole, and the lower half (23b) of the third through hole are all configured as spindle-shaped through holes with a cross-sectional area in the middle portion larger than that at both ends.

9. An abdominal aortic endovascular stent graft system, characterized in that, The abdominal aortic endovascular stent graft system includes the abdominal aortic endovascular stent graft as described in any one of claims 2 to 8, and further includes: The first sub-stent has one end coupled to the upper half (22a) of the second through hole, and the other end of the first sub-stent is used to be embedded in the celiac trunk artery so that the celiac trunk artery communicates with the abdominal aorta. The second sub-stent has one end coupled to the lower half (22b) of the second through hole, and the other end of the second sub-stent is used to be embedded in the left renal artery so that the left renal artery communicates with the abdominal aorta; The third sub-stent, one end of which is coupled to the upper half (23a) of the third through hole, and the other end of which is used to be embedded in the superior mesenteric artery so that the superior mesenteric artery communicates with the abdominal aorta; The fourth sub-stent is coupled at one end to the lower half (23b) of the third through-hole, and the other end of the fourth sub-stent is used to be embedded in the right renal artery so that the right renal artery communicates with the abdominal aorta.

10. An abdominal aortic endovascular stent graft system, characterized in that, The abdominal aortic endovascular stent graft system includes the abdominal aortic endovascular stent graft as described in any one of claims 2 to 8, and further includes: A delivery device for delivering the abdominal aortic stent graft to a predetermined location and then releasing it.

Images