CN211723545U - A stent-graft for aortic dissection with insufficient anchoring zone - Google Patents

Abstract

The utility model belongs to the field of medical devices and relates to a covered stent, in particular to a covered stent used for aortic dissection with insufficient anchoring area. Its main structure includes a bracket and a membrane; the bracket consists of a support ring and connecting ribs, a single support ring is composed of a plurality of N-type supports, and the support ring and the support ring are respectively connected by two S-type connecting ribs. ; The cylindrical membrane portion has a circumferential slit at the proximal end. It is especially suitable for aortic dissection lesions with insufficient anchoring area. It has a good supporting effect on the aorta, less damage to the vessel wall, and has good flexibility. For the insufficient anchoring area, the proximal end of the covered stent It protrudes into the left subclavian artery, and the membrane at the proximal end has a slit, which can actively change the hemodynamics of the aortic arch while maintaining the blood flow of the aortic branch, which is conducive to the formation of thrombus in the dissection and avoids the occurrence of thrombus in the branch. The steps of "opening the window" to implant branch stents are highly maneuverable.

Description

A stent-graft for aortic dissection with insufficient anchoring zone

Technical field:

The utility model relates to the technical field of medical devices, in particular to an aortic dissection covered stent for insufficient anchoring area.

Background technique:

People living in modern society, due to high life pressure, irregular work and rest and unhealthy diet, cardiovascular disease has become a common clinical disease, among which thoracic aortic dissection (TAD) is currently the more common A very dangerous cardiovascular disease. Mainly refers to the tearing of the aortic intima and part of the media, which leads to the stratification of the blood vessel wall, and the blood enters the aortic media through the torn intima to form two true and false lumens. 30%-35% of the

Endovascular aortic repair is widely used to treat aortic dissection, but it faces many challenges during stent graft implantation. On the one hand, since aortic dissection often involves the aortic arch, a curved vascular stent needs to be implanted, and the stent has good compliance performance; in order to make the coating on the stent have good adherence, the stent also needs to have sufficient supporting performance . On the other hand, in order to achieve the effect of sealing the dissection rupture, the proximal support area of the stent must have a normal arterial wall structure. The structural stability of the opening of the left subclavian artery mainly depends on the integrity of the surrounding tissue. When the aorta involves the left subclavian artery, using this area as a support area will cause the stent to tear the dissection intima and blood into the false lumen, which is extremely risky. If the support area is migrated to the proximal end, the branch will be blocked, resulting in complications such as cerebral ischemia. At present, the main way to solve such problems for insufficient anchoring area is to implant branch stents in branches to protect and strengthen the involved branch arteries. The introduction of branch stents will inevitably involve a variety of situations in relation to the relative spatial position of the trunk stents. The surgical operation is difficult, the operation is difficult, the operation time is long, the trauma is large, and the mortality rate is high. In addition, during the operation, there are many pipelines in the field of view and the sequence is complicated, and there are many anastomotic sites. The long operation time leads to the corresponding prolongation of the cerebral ischemia time and the cardiopulmonary bypass time, thereby increasing the operative mortality and cerebral complications. Chinese patent CN200820079059.4 provides a cobalt-chromium alloy coronary stent design with sinusoidal connecting sections and alternately arranged support sections, which can achieve uniform expansion of the stent and has good radial strength, but it is not suitable for curved blood vessels The medium release lacks a certain degree of flexibility, and its support performance and flexibility cannot be satisfied at the same time. Chinese patent CN201420620618.3 can block and isolate the false lumen rupture, and actively reduce the false lumen space, change the blood flow velocity and flow in the false lumen, and ensure that the false lumen quickly forms thrombus within the desired time, and the bulging part can be It can effectively prevent the displacement and sliding caused by the impact of blood flow after the stent is implanted into the human body, and avoid the recurrence of the disease caused by the exposure of the original artery rupture due to the displacement of the stent, but it is not suitable for aortic dissection with insufficient anchoring area.

Therefore, it is very necessary to seek to design a new type of stent-graft that can be safely released in tortuous blood vessels, effectively block the dissection rupture, and actively improve the blood flow in the blood vessel.

SUMMARY OF THE INVENTION

The purpose of the invention of the present invention is to overcome the shortcomings of the prior art, seek to design a kind of small damage to the blood vessel wall, and has good support and flexibility. The stent graft for aortic dissection actively changes the hemodynamics of the aortic arch while increasing the blood flow of the upper branch.

In order to achieve the above-mentioned purpose of the invention, the stent-graft for aortic dissection with insufficient anchoring area according to the present invention is composed of several N-type supports, which are respectively arranged in a certain manner along the circumferential direction and the axial direction, and are arranged in a certain manner in the circumferential direction and the axial direction. The surface of the stent is covered with a membrane with slits.

The N-type support is the most basic unit of the stent, and all the constituent rods are connected by arcs with different diameters. The whole stent is connected by several arcs, so as to avoid sharp angles and damage to the blood vessel wall.

The support ring and the support ring are intermittently connected by two kinds of S connecting ribs.

The first S-shaped connecting rib is an S-shaped connecting rib with double rods, and the double rods are respectively connected with the apex of the shallow wave trough of the former support ring and the apex of the low wave crest of the latter support ring, and every two shallow wave troughs or low wave troughs are connected. The crest appears once. Since the shallow wave troughs and low wave crests between the two support rings connected to this connecting rib are far apart, on the premise of ensuring sufficient support strength of the support, a double rod with double rods is arranged every two shallow wave troughs or low wave crests along the circumferential direction. The S-shaped connecting rib enables the stent to be released smoothly in the curved blood vessel, and this part of the stent structure mainly plays a compliant role.

The second type of S-shaped connecting rib is a double-bar S-shaped connecting rib, and the two ends of the connecting rib are respectively connected with the left end point of the deep wave valley arc of the previous support ring and the right end point of the high wave crest arc of the latter support ring. . Since the deep wave troughs and high wave crests between the two support rings connected to the connecting rib are relatively close, on the premise of ensuring the support has sufficient compliance performance, a double-free rod is set every three shallow wave troughs or low wave crests along the circumferential direction. The S-shaped connecting rib enables the stent to adhere well to the wall when the stent is released smoothly in the blood vessel, and this part of the stent structure relatively mainly plays a supporting role.

The stent-graft for aortic dissection as a whole forms a closed-loop structure.

The membrane in the present invention is provided with slits in the circumferential direction of the proximal end. As for the size of the slits, it should be reasonably set according to the diameter of the branch and the diameter of the aorta at the branch, and the slits are reasonably and uniformly distributed along the circumferential direction; According to the depth of the stent-graft protruding into the left subclavian artery, the interval and number of slits were reasonably set. Therefore, in the aortic dissection with insufficient implantation anchoring area, the blood flow at the branch blood flow inlet of the stent-graft is kept in a good state.

Compared with the prior art, the utility model is particularly suitable for aortic dissection with insufficient anchoring area, has good supporting effect on the aorta, less damage to the blood vessel wall, and at the same time satisfies the smooth release in the arch of the curved aorta, The flexibility of the aortic stent-graft is further improved. In addition, in the case of insufficient anchoring area, the proximal end of the stent-graft protrudes into the left subclavian artery. Since the covered part has a slit, it can actively change the blood flow of the aortic arch while maintaining the blood flow of the aortic branch. It is beneficial to the formation of thrombus in the dissection, and the steps of "opening a window" or implanting a branch stent at the branch site are omitted, and the operation is simple.

Description of drawings:

Fig. 1 is the plane structure schematic diagram of the stent-graft for aortic dissection of the present invention;

2 is an enlarged view of a single N-type support unit of the stent-graft for aortic dissection of the present invention;

Figure 3 is a schematic diagram of the S-shaped connecting rib with double rods related to the connection of the relatively main supporting ring with a compliant function of the present invention;

FIG. 4 is a schematic diagram of the S-shaped connecting rib without double rods related to the connection of the relatively main supporting ring of the present invention; FIG.

FIG. 5 is a plan development view of the utility model relating to a film with a slit.

In the figure: 1-deep wave trough, 2-shallow wave trough, 3-low wave crest, 4-high wave crest, 5-type N-type support, 6-first support ring, 7-with double-bar S-type connecting rib, 8- No double-bar S-shaped connecting rib, 9-second support ring, 10-third support ring, 11-film with slits.

Detailed ways:

The present utility model will be further elaborated below through specific embodiments and accompanying drawings.

Example 1:

The stent-graft for aortic dissection described in this embodiment is suitable for insufficient anchoring area, and its main structure includes: the body structure includes two parts: the stent and the covering 11 . The bracket part is composed of a plurality of support rings and connecting ribs along the axial direction. The first support ring 6 is mainly connected by the N-type support units 5 in a certain order in the circumferential direction, and the axial support rings also connect the N-type support units 5 in a certain order to form the main body of the stent. The adjacent first support ring 6 and the second support ring 9 are connected by double rods with double rod S-shaped connecting ribs 7 in turn to connect the apex of the shallow wave valley 2 of the first support ring 6 and the apex of the low wave peak 3 of the second support ring 9. Every two shallow wave troughs 2 or low wave crests 3 appear once; the adjacent second support ring 9 and the third support ring 10 are connected by the two ends of the double-bar S-shaped connecting rib 7 in turn to the second support ring 9 deep wave valley 1 arc. The left end point and the right end point of the arc of the high wave crest 4 of the third support ring 10 are provided with a double-bar S-shaped connecting rib every three shallow wave valleys 2 or low wave crests 3 along the circumferential direction. The membrane 11 with slits in FIG. 5 can be sewn on the stent according to certain rules.

Compared with the prior art, the advantages of the invention are: the stent-graft for aortic dissection involved in the present utility model has good supporting effect on the aorta for aortic dissection with insufficient anchoring area, less damage to the blood vessel wall, and at the same time. Satisfying the smooth release in the arch of the curved aorta, the flexibility of the stent-graft is further improved. In addition, in the case of insufficient anchoring area, the proximal end of the stent-graft protrudes into the left subclavian artery. Since the covered part has a slit, it can actively change the blood flow of the aortic arch while maintaining the blood flow of the superior aortic branch. dynamic situation. It not only blocks and isolates the rupture of the false lumen, but also can change the blood flow state in the false lumen, which is conducive to the rapid formation of thrombus in the dissection within the desired time, eliminating the need for "windowing" at the branch site or implanting branch stents steps, easy to operate.

Claims (5)

1. A stent-graft for aortic dissection with insufficient anchoring area, it is characterized in that the main body structure comprises two parts of a stent and a covering: the stent part is made up of a plurality of support rings and connecting ribs along the axial direction, and the adjacent two supports The rings are respectively connected by S-type connecting ribs with double rods and S-type connecting ribs without double rods; each support ring is composed of several types of N-type supports, and a single N-type support body is composed of different heights. Alternately arranged to form a closed structure; the membrane portion is circumferentially opened with several slits at the proximal end. 2 . The stent-graft for aortic dissection according to claim 1 , wherein all the connecting rods of the N-type support body are composed of several arc segments. 3 . 3 . The stent-graft for aortic dissection according to claim 1 , wherein each support ring is sequentially connected by a plurality of N-type supports along the circumferential direction. 4 . 4. The stent-graft for aortic dissection according to claim 1, characterized in that the stent part is composed of a plurality of support rings and connecting ribs along the axial direction, and the two adjacent support rings are respectively connected by a double-bar S-shaped connection. The rib and the double-bar S-shaped connecting rib are alternately connected; the two rods in the double-bar S-shaped connecting rib are connected to the shallow wave valley (2) vertex and the low wave peak (3) vertex of the two bracket rings respectively, and the double-bar S-shaped connecting rib is two. The ends are respectively connected with the left side of the deep wave trough (1) circular arc segment and the high wave crest (4) the right side of the circular arc segment of the two support rings. 5 . The stent-graft for aortic dissection according to claim 1 , wherein the proximal end of the membrane is provided with a plurality of slits in the circumferential direction of the part protruding into the left subclavian artery. 6 .

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