CN107174376A - A kind of arteria covering membrane supporter - Google Patents

Abstract

The invention discloses an arterial stent graft, the stent graft (2) comprises a stent graft segment (7) and a bare stent segment (6); the stent graft segment (7) comprises a corrugated annular metal wire (3), covering film (4) and cilium (5); Described corrugated circular metal wire (3) comprises multiple circles, and each circle is distributed successively along the axial direction of covering film (4); Described cilium (5) adheres to On the corrugated ring wire, the cilia attached to the ring wire (3) at both ends of the stent graft segment (7) are distributed in a short and dense state; the ring wire at the middle of the stent graft segment (7) (3) The cilia are long and sparsely distributed. The cilia provided in the stent-graft provided by the present invention can buffer the compressive stress of the stent on the vessel wall at the neck of the tumor, reduce the stimulation of the stent to the neck of the tumor; increase the bonding area and friction between the stent-graft and the neck of the tumor, increase The stability of the stent reduces the incidence of stent displacement.

Description

An arterial covered stent

technical field

The invention relates to the technical field of medical devices, in particular to an arterial covered stent.

Background technique

Existing aortic aneurysm and aortic dissection are common diseases of the aorta with a high mortality rate. At present, the treatment of these two diseases is mainly based on the application of endovascular exclusion with covered stents. Various "endoleaks" and stent displacement phenomena during the implantation of aortic stent grafts are the two biggest difficulties in the operation.

"Endoleak" is one of the most common complications of endovascular treatment of aortic aneurysms. It refers to the phenomenon that blood continues to flow into the aneurysm cavity through various channels after the stent graft is implanted. It can completely isolate the communication between the tumor cavity and the arterial blood flow. Endoleaks can lead to continued enlargement of the tumor cavity after stent-graft repair and eventually rupture, resulting in death of the patient. Stent migration is another common complication of endovascular repair of aortic disease. After the stent is released, it fails to be effectively anchored in the lesion according to the original plan, and the position shifts, which not only hinders the effect of the stent, but also endangers the branches of the artery.

Existing stents have limited preventive measures for "endoleak" and "displacement", and often easily cause damage to the arterial wall. For abdominal aortic aneurysms near the renal artery, thoracic aortic aneurysms near the subclavian artery, and dissecting aneurysms, due to the short aneurysm neck and fragility of the aneurysm wall, it is extremely difficult to repair conventional stent grafts. Complicated operations such as stent and chimney technique require a long operation time, a low success rate and many complications. Sometimes it is unavoidable to sacrifice one side of the renal artery or sacrifice the left subclavian artery.

Contents of the invention

In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a kind of arterial stent-graft, this stent has increased cilia on the original arterial stent-graft, and cilia can buffer the compressive stress of stent to the blood vessel wall at the neck of aneurysm, reduce the stent's impact on the aneurysm neck. Stimulation of the tumor neck; it can increase the bonding area and friction between the covered stent and the tumor neck, increase the stability of the stent, and reduce the incidence of stent displacement; it can make the combination between the stent and the tumor neck more tightly, preventing type I Endoleak; at the same time, the adsorption of cilia, mechanical overlap and activation of blood coagulation can quickly induce thrombus around the periphery of the stent, and the risk of various types of endoleaks in the rapidly thrombosed tumor cavity is rapidly reduced.

The purpose of the present invention is achieved through the following technical solutions:

An arterial stent graft comprises a stent graft segment (7) and a bare stent segment (6); the stent graft segment (7) comprises a corrugated annular metal wire (3), a membrane (4) and cilia ( 5);

The corrugated annular metal wire (3) includes multiple turns, and each turn is distributed sequentially along the axial direction of the covering film (4);

The cilia (5) are attached to the corrugated ring wires, and the cilia attached to the ring wires (3) at both ends of the stent graft segment (7) are distributed in a short and dense state; in the stent graft segment (7) ) The cilia on the ring wire (3) in the middle section are distributed in a long and sparse state.

Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

Buffer the compressive stress of the stent on the vessel wall at the neck of the tumor, so that the compressive stress of the stent on the neck of the tumor is evenly distributed, reducing the stimulation of the stent on the neck of the tumor;

The mechanical filling effect causes the dense microcilia at the neck of the tumor to make the stent and the neck more tightly combined to prevent type I endoleak; increase the bonding area and friction between the stent graft and the neck of the tumor to make the stent more stable .

Utilizing the adsorption effect of cilia, mechanical overlapping effect and activation of coagulation effect, the thrombus can be rapidly induced around the periphery of the stent, and the risk of various types of endoleaks in the rapidly thrombusized tumor cavity is rapidly reduced. The microcilia overlap and stagger in the aneurysm, and can build a dense grid ("scaffolding") inside the aneurysm and at the neck of the aneurysm, effectively reducing the blood flow through the aneurysm neck, and at the same time adsorbing platelets and coagulation substances, which is beneficial to Formation of more stable thrombus in the tumor body and neck. Nylon and PGLA materials can quickly and stably cause thrombus through blood coagulation activity and activity of inducing tissue reaction respectively, and effectively prevent various types of endoleaks.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a schematic diagram of the structure of an arterial stent graft;

Figure 2 is a schematic diagram of the aneurysm structure;

3 is a schematic diagram of the structure of the arrangement of cilia on the stent graft;

Fig. 4 is a schematic diagram of the winding and suturing structure of the cilia on the stent graft;

Fig. 5 is a structural schematic diagram of a covered stent in a thoracic aortic aneurysm;

Fig. 6 is a schematic diagram of the structure of the covered stent in an abdominal aortic aneurysm;

Figure 7 is a cross-sectional view of the neck of the aneurysm after the covered stent is implanted;

Fig. 8 is a cross-sectional view of the aneurysm after the covered stent is implanted.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

As shown in Figure 1, it is an arterial stent-graft structure, and the stent-graft includes a stent-graft segment 7 and a bare stent segment 6; the stent-graft segment 7 includes a corrugated annular wire 3, a membrane 4 and cilia 5;

The corrugated annular wire includes multiple turns, and each turn is distributed sequentially along the axial direction of the film;

The cilia 5 are attached to the corrugated annular wire 3 (as shown in Figure 3), and the cilia attached to the annular wire at both ends of the stent graft segment are distributed in a short and dense state; in the middle section of the stent graft segment The cilia on the circular wire are long and sparsely distributed.

The length of the cilia attached to the ring wire at both ends of the stent graft segment 7 is 4-6 mm; the length of the cilia attached to the ring wire at the middle section of the stent graft segment 7 is 10-15 mm.

The distance between the edge where the above-mentioned cilia 5 is attached and the edge of both ends of the stent-graft segment 7 is 5 mm.

The above-mentioned cilia 5 attached to the corrugated ring wire 3 are fixed on the corrugated ring wire 3 by a fixing member 8 in a winding manner (as shown in FIG. 4 ).

Figure 2 is a schematic diagram of the aneurysm structure.

As shown in FIG. 5 and FIG. 6 , the structures of the stent graft 2 in the thoracic aortic aneurysm 1 and the stent graft 2 in the abdominal aortic aneurysm 1 are respectively shown.

Each turn of the corrugated annular metal wire is stretched elastically along the radial direction of the coating, and multiple turns of the corrugated annular metal wire together with the coating form a cylindrical elastic structure.

The lower end and the upper end of the stent-graft are in the shape of a gradually expanding bell mouth or a straight cylinder, and the bare stent segment in the stent-graft is arranged at the upper end of the stent-graft segment.

As shown in FIG. 7 and FIG. 8 , they are respectively a cross-sectional view at the neck of the aneurysm after the stent graft 2 is implanted in the aneurysm 1 ; and a cross-sectional view at the tumor body after the stent-graft is implanted in the aneurysm 1 .

The above-mentioned cilia are made of polymer materials with good biocompatibility and easy adsorption of platelets and coagulation substances, including but not limited to Nylon (non-absorbable), PGLA (containing 90% polyglycolide and 10% polyglycolic acid, which can absorption), etc.

The above-mentioned covering film is made of high-molecular materials with good biocompatibility, including but not limited to polyurethane, polytetrafluoroethylene, polyester, polyester, etc., to isolate the aneurysm and ensure blood flow along the artery direction to the far end.

The proximal bare stent section of the covered stent section is provided with an anti-off fixing piece, which can be barbs, barbs, etc., which can resist the impact of blood flow after the stent is opened, and fix the covered stent on the aortic wall superior.

The above-mentioned corrugated ring wire is made of elastic alloy material, including but not limited to stainless steel, memory alloy and other materials.

Although the embodiments disclosed in the present invention are as above, the described content is only an embodiment adopted for the convenience of understanding the present invention, and is not intended to limit the present invention. Anyone skilled in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention, The scope defined by the appended claims must still prevail.

Claims (10)

1. an arterial stent graft, is characterized in that, described stent graft (2) comprises stent graft segment (7) and bare stent segment (6); Described stent graft segment (7) comprises wave ring Metal wire (3), coating (4) and cilia (5); The corrugated annular metal wire (3) includes multiple turns, and each turn is distributed sequentially along the axial direction of the covering film (4); The cilia (5) are attached to the corrugated ring wires, and the cilia attached to the ring wires (3) at both ends of the stent graft segment (7) are distributed in a short and dense state; in the stent graft segment (7) ) The cilia on the ring wire (3) in the middle section are distributed in a long and sparse state. 2. Artery stent graft as claimed in claim 1, is characterized in that, The length of the cilia attached to the ring wires (3) at both ends of the stent graft segment (7) is 4-6mm; The length of the cilia attached to the ring wire (3) in the middle section of the stent graft section (7) is 10-15mm. 3 . The arterial stent graft according to claim 1 , wherein the distance between the edge of the attachment of the cilia ( 5 ) and the membrane edge at both ends of the stent graft segment ( 7 ) is 5 mm. 4. The arterial stent graft as claimed in claim 1, characterized in that, the cilia (5) attached to the corrugated ring wire (3) are fixed to the stent by a fixing member (8) in a winding manner. On the corrugated annular metal wire (3). 5. The arterial stent graft as claimed in claim 1, characterized in that, each circle of the wave-shaped annular wire (3) is stretched elastically along the radial direction of the graft, and the multi-circle wave-shaped annular wire (3) ) together with the coating (4) form a cylindrical elastic structure. 6. arterial stent graft as claimed in claim 1, is characterized in that, described stent graft (2) lower end and upper end are bell mouth type or straight tube type that expand gradually, and the bare stent segment in stent graft ( 6) Set on the upper end of the stent graft segment (7). 7. The arterial stent graft according to claim 1, characterized in that the cilia (5) are made of polymer materials with good biocompatibility and easy adsorption of platelets and coagulation substances. 8. The arterial stent graft according to claim 1, characterized in that, the graft (4) is made of a polymer material with good biocompatibility. 9. The arterial stent graft according to claim 1, characterized in that, the proximal bare stent segment (6) of the stent graft segment (7) is provided with an anti-off fixing piece. 10. The arterial stent graft according to claim 1, characterized in that, the wave-shaped annular metal wire (3) is made of elastic alloy material.