Semi-covered stent applied to treatment of aortic dissection by Gunson's surgery

Abstract

The utility model discloses a semi-covered stent applied to treatment of aortic dissection in Glardson's surgery, which comprises a metal framework, the metal framework is provided with a main support section and an auxiliary support section connected to the lower end of the main support section, and the main support section and the auxiliary support section are both constructed into an annular net-shaped structure capable of expanding along the radial direction, a covering film is arranged on the circumferential surface of the main supporting section, and meshes are distributed in the circumferential direction of the auxiliary supporting section after the auxiliary supporting section expands in the radial direction. The intravascular stent has the advantages that the descending aorta can be supported in an omnibearing mode only by being placed in the intravascular stent for one time, and blood supply of spinal cord branch blood vessels cannot be blocked.

Description

Technical Field

[0001] The utility model relates to a vascular stent, in particular to a semi-covered stent applied to the Sun's operation for treating aortic dissection. Background Art

[0002] Aortic dissection refers to the tearing between the intima and media of the aorta, and blood enters the media layer, resulting in the stratification of the blood vessel wall. Aortic dissection is the most dangerous disease in cardiovascular surgery, with a very high risk of death. Once it ruptures, it is usually difficult to rescue.

[0003] For the treatment of aortic dissection, emergency surgical operation is the preferred treatment plan. In particular, the Sun's operation invented by Professor Sun Lizhong is the gold standard for treating this serious disease. The essence of the Sun's operation lies in implanting a blood-covered tube stent into the descending aorta, using the expansion characteristics of the stent to close the intimal rupture of the blood vessel, promoting thrombosis of the distal false lumen, promoting positive remodeling of the distal aorta, and reducing the possibility of secondary surgery.

[0004] Since there are branch blood vessels supplying blood to the spinal cord in the lower part of the descending aorta blood vessel, and in addition, the current blood vessel stents used in the Sun's operation are all covered stents. If the implantation depth of the covered stent exceeds the spinal cord branch blood vessel downward, it will cause the blockage of the blood supply of the spinal cord branch blood vessel, resulting in serious complications such as spinal cord ischemia and paraplegia. Therefore, in the actual surgical treatment process, the implantation depth of the covered stent cannot exceed the spinal cord branch blood vessel, but this will also cause incomplete coverage of the lower part of the descending aorta by the stent, insufficient thrombosis of the false lumen in the uncovered area, which is not conducive to the positive remodeling of the aorta, and the stenosis of the distal true lumen may lead to organ ischemia. To solve this problem, the current solution is mainly to continue to connect a bare stent to support the distal descending aorta area of the covered stent through other interventional surgeries after the covered stent is implanted. In this way, there are also problems of the trauma of the secondary surgery and the high surgical cost. Content of the Utility Model

[0005] In view of the above situation, the utility model provides a semi-covered stent applied to the Sun's operation for treating aortic dissection, which can form a more comprehensive support for the descending aorta only by single implantation of the blood vessel stent, and will not cause blockage of the blood supply of the spinal cord branch blood vessel.

[0006] To achieve the above object, the technical solution of the utility model is as follows:

[0007] A semi-covered stent applied to the Sun's operation for treating aortic dissection, which is characterized in that: it includes a metal framework, the metal framework has a main support section and an auxiliary support section connected to the lower end of the main support section, both the main support section and the auxiliary support section are configured as annular mesh structures capable of expanding radially, wherein, a covering film is arranged on the circumferential surface of the main support section, and after the auxiliary support section expands radially, mesh holes are distributed circumferentially thereon.

[0008] Preferably, the main support section is composed of a plurality of closed rings arranged in an axial array, there is a spacing between two adjacent closed rings, and the film is integrated on the surfaces of each closed ring by using an artificial blood vessel. The circumferential profile of the closed ring is a "W"-shaped wave structure.

[0009] Preferably, the auxiliary support section is transitionally connected to the lowermost closed ring; at least a part of the lower end of the film is coated and integrated on the upper end of the auxiliary support section. The upper end of the film extends upward beyond the metal skeleton.

[0010] Preferably, the auxiliary support section has a plurality of wavy rings arranged axially in sequence, and two adjacent wavy rings are connected into one body by a bridging rod.

[0011] Preferably, both the main support section and the auxiliary support section are made of stainless steel or nitinol alloy materials. The film is made of polyester or polytetrafluoroethylene.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. When using the semi-covered film stent provided by the present utility model in the Sun's operation, by only inserting the blood vessel stent once, a more comprehensive support can be formed for the descending aorta, that is, it can cover both the upper segment area of the descending aorta and the lower segment area of the descending aorta at the position of the corresponding spinal cord branch blood vessels, ensuring that there is no uncovered area at the position of the spinal cord branch blood vessels in the descending aorta, playing an important role in more comprehensively expanding the true lumen of the descending aorta and promoting the thrombosis of the false lumen, thereby being beneficial to the positive remodeling of the blood vessels of patients with aortic dissection and improving the blood supply of distal organs.

[0014] 2. The auxiliary support section expands and supports above and below the position of the spinal cord branch blood vessels, and the blood in the descending aorta can flow into the spinal cord branch blood vessels through the mesh holes, and complications such as blockage of blood supply to the spinal cord branch blood vessels, spinal cord ischemia, and paraplegia will not occur.

[0015] 3. The lower end of the semi-covered film stent is integrated with an auxiliary support section, which can directly support in the area of the descending aorta corresponding to the spinal cord branch blood vessels. The patient does not need other interventional surgeries to connect a bare stent, reducing the trauma caused by secondary reoperation and effectively reducing the economic burden on the patient and his family. Description of the Drawings

[0016] Figure 1 It is a reference diagram of the usage state after the semi-covered film stent is installed in the descending aorta 3.

[0017] Figure 2 It is a schematic structural diagram of the semi-covered film stent.

[0018] Figure 3 It is a cross-sectional view of the semi-covered film stent.

[0019] Figure 4 A schematic diagram of the structure of the closed loop b in the main support segment 1a.

[0020] Figure 5 It is a schematic diagram of the local structure of the auxiliary support segment 1b. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with embodiments and drawings.

[0022] like Figure 2 As shown, a semi-covered stent is composed of a metal skeleton 1 and a covering 2, wherein the Figure 3 It can be seen that the metal skeleton 1 is composed of two structures, the main support section 1a and the auxiliary support section 1b. The auxiliary support section 1b is connected to the lower end of the main support section 1a, and the coating 2 is integrated and covered on the circumferential surface of the main support section 1a by a coating process or other methods. The main support section 1a and the auxiliary support section 1b are both constructed into an annular mesh structure, and the corresponding annular mesh structure can expand radially outward. After the auxiliary support section 1b expands radially outward, it has mesh a distributed in the circumference.

[0023] Please refer to the attached Figure 1 In Sun's surgical treatment, after the semi-covered stent is placed in the patient's descending aorta 3, the main support segment 1a and the covering 2 thereon are supported in the upper area of ​​the descending aorta 3, and the auxiliary support segment 1b is supported in the lower area of ​​the descending aorta 3 corresponding to the spinal branch blood vessel 4. In this way, all-round positioning support is achieved for the descending aorta 3, and there is no uncovered area at the position of the spinal branch blood vessel 4, which plays an important role in expanding the true lumen of the entire descending aorta and promoting the comprehensive thrombosis of the false lumen. In addition, after the auxiliary support segment 1b is expanded and supported at the position of the spinal branch blood vessel 4, meshes a will be distributed circumferentially. During the patient's stent placement, the blood in the descending aorta 3 can flow into the spinal branch blood vessel 4 through the meshes a, and there will be no blockage of the blood supply to the spinal branch blood vessel 4, thereby avoiding the complications such as spinal cord ischemia and paraplegia caused by the placement of stents in traditional surgery.

[0024] like Figure 3 As shown, in this embodiment, the main support section 1a is composed of a plurality of closed rings b distributed in an axial array, and there is a distance between two adjacent closed rings b. After the coating 2 is coated on the surface of each closed ring b by a coating process, all the closed rings b can be formed into an integral structure, that is, the main support section 1a. Figure 5It can be seen that the auxiliary support section 1b has a plurality of wavy rings c arranged axially in sequence, and adjacent two wavy rings c are connected into one body by a bridging rod d. With such an implementation structure of the semi-covered stent, it not only takes into account the structural integrity of the main support section 1a and the auxiliary support section 1b, but also ensures that both have better deformation ability. When manufacturing the semi-covered stent, the entire stent can be shrunk into a thin strip by a restraint wire. Thus, it is ensured that during the operation, the semi-covered stent can be inserted into the patient's blood vessel in a thin strip structure, and then the restraint wire is untied, and the semi-covered stent can expand and support in the blood vessel. Based on this, the metal skeleton 1 and / or the film 2 are preferably made of elastic materials so that they can automatically expand after being inserted.

[0025] Please refer Figure 3 and Figure 4 , furthermore, the circumferential profile of the closed ring b is a "W"-shaped wavy structure. In order to maintain the integrity of the product, the auxiliary support section 1b is transitionally connected to the lowermost closed ring b, and at least part of the lower end of the film 2 is coated and integrated on the upper end of the auxiliary support section 1b. In order to better fix the stent in the blood vessel, after the film 2 covers the metal skeleton 1, the uppermost closed ring b is in an exposed state, and the exposed closed ring b at this place can improve the installation stability of the stent in the blood vessel.

[0026] To adapt to the length ratio of the human descending aorta 3, the length of the main support section 1a should not exceed 12 cm, and the length of the auxiliary support section 1b should not exceed 8 cm. The preferred design lengths are: the length of the main support section 1a is 10 - 12 cm, and the length of the auxiliary support section 1b is 6 - 8 cm. Of course, various combined stents with the main support section 1a having lengths of 10, 11, 12 cm and the auxiliary support section 1b having lengths of 6, 7, 8 cm can also be manufactured respectively. In terms of materials, both the main support section 1a and the auxiliary support section 1b are preferably made of stainless steel or nitinol materials. The film 2 is made of artificial blood vessels, that is, made of polyester, polytetrafluoroethylene, etc. In this embodiment, the upper end of the film 2 extends upward beyond the main support section 1a, and the extended part is a suture section 2a to facilitate the doctor to suture the artificial blood vessel during the operation. The length of the suture section 2a should not be less than 5 cm, and is preferably set to 5 cm.

[0027] Finally, it should be noted that the above description is only the preferred embodiment of the present utility model. Under the inspiration of the present utility model, those of ordinary skill in the art can make various similar representations without violating the purpose and claims of the present utility model, and such transformations all fall within the protection scope of the present utility model.

Claims

1. A semi-covered stent used in Sun's procedure to treat aortic dissection, characterized by: The invention comprises a metal skeleton (1), wherein the metal skeleton (1) comprises a main support segment (1a) and an auxiliary support segment (1b) connected to the lower end of the main support segment (1a), wherein the main support segment (1a) and the auxiliary support segment (1b) are both constructed into an annular network structure capable of radial expansion, wherein a coating (2) is provided on the circumferential surface of the main support segment (1a), and after the auxiliary support segment (1b) is radially expanded, mesh holes (a) are distributed in the circumferential direction.

2. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 1, characterized in that: The main support section (1a) is composed of a plurality of closed rings (b) distributed in an axial array, with a spacing between two adjacent closed rings (b), and the coating (2) is formed by using an artificial blood vessel to cover the surface of each closed ring (b).

3. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 2, characterized in that: The circumferential profile of the closed ring (b) presents a "W"-shaped wave structure.

4. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 2, characterized in that: The auxiliary support section (1b) is transitionally connected to the closed ring (b) located at the lower end; the lower end of the coating (2) is at least partially coated and integrated on the upper end of the auxiliary support section (1b).

5. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 2, characterized in that: The upper end of the covering membrane (2) has a suture section (2a) that exceeds the upper end of the main supporting section (1a).

6. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 1, characterized in that: The auxiliary support section (1b) has a plurality of wavy rings (c) arranged in sequence along the axial direction, and two adjacent wavy rings (c) are connected as a whole via a bridging rod (d).

7. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 1, characterized in that: The main support section (1a) and the auxiliary support section (1b) are both made of stainless steel or nickel-titanium alloy material.

8. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 1, characterized in that: The coating (2) is made of polyester or polytetrafluoroethylene.

9. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 1, characterized in that: The length of the main support section (1a) does not exceed 12 cm, and the length of the auxiliary support section (1b) does not exceed 8 cm.

10. The semi-covered stent for use in Sun's procedure for treating aortic dissection according to claim 9, characterized in that: The length of the main support section (1a) is 10-12 cm, and the length of the auxiliary support section (1b) is 6-8 cm.

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