CN214908651U

CN214908651U - Conformal covered stent for transjugular intravenous intrahepatic portosystemic shunt

Info

Publication number: CN214908651U
Application number: CN202120545207.2U
Authority: CN
Inventors: 杨广鑫; 王昌明; 李选
Original assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Current assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-11-30
Anticipated expiration: 2031-03-16

Abstract

The application relates to the technical field of medical equipment, and particularly discloses a conformal covered stent for transjugular internal hepatic portal shunt, which is of a cylindrical structure and comprises a covered membrane and a stent which are sleeved, wherein the conformal covered stent is provided with a first curved region implanted into a vena cava and a second curved region implanted into a portal vein, and an included angle of 60-180 degrees is formed between the plane where the first curved region is located and the plane where the second curved region is located; the length of the coating film on the outer curved side of the first curved region is greater than the length of the coating film on the inner curved side of the first curved region, and the length of the coating film on the outer curved side of the second curved region is greater than the length of the coating film on the inner curved side of the second curved region. The application adapts to the approximately S-shaped three-dimensional space relationship between the portal vein and the vena cava, improves the unobstructed rate of the covered stent, and improves the treatment effect of portal hypertension.

Description

Conformal covered stent for transjugular intravenous intrahepatic portosystemic shunt

Technical Field

The application relates to the technical field of medical equipment, in particular to a conformal covered stent for transjugular intrahepatic portosystemic shunt.

Background

Hepatitis virus infection is a global problem, but china is an important epidemic. About one hundred million chronic hepatitis virus carriers die each year of several hundred thousand of people from various secondary diseases caused by chronic hepatitis virus infection, including liver cirrhosis, liver cancer, and the like. Among them, portal hypertension is the inevitable end of life with the development of cirrhosis, and complications such as gastrointestinal hemorrhage and ascites due to portal hypertension seriously affect the quality of life and even the life of a patient.

Transjugular Intrahepatic Portosystemic Shunt (TIPS), an important minimally invasive treatment method for relieving portal hypertension, has been applied clinically since the 80 s of the 20 th century, and the surgical effect is continuously improved. TIPS reduces portal hypertension by establishing a shunt channel between the portal vein and the vena cava through a stent, and the patency of the stent directly influences the effect of the operation.

One factor in terms of stent patency is the contradiction between the stent profile and the actual shunt channel spatial configuration. The three-dimensional spatial relationship between the portal vein and the vena cava is approximately S-shaped, however, the currently available stent is generally in a straight cylinder shape in a natural state, and one of the reasons for the configuration contradiction between the straight cylinder shape and the S-shaped form to cause restenosis and even occlusion in the stent.

SUMMERY OF THE UTILITY MODEL

In order to adapt to the three-dimensional space relation of the approximate S-shaped between portal vein and vena cava, improve the unobstructed rate of covered stent, improve portal hypertension treatment, the application provides a conformal covered stent through internal jugular vein intrahepatic portosystemic reposition of redundant personnel art, adopts following technical scheme:

a conformal covered stent for transjugular intravenous intrahepatic portal shunt is of a cylindrical structure and comprises a covered membrane and a stent which are sleeved, wherein the conformal covered stent is provided with a first bent area implanted into a vena cava and a second bent area implanted into a portal vein, and an included angle of 60-180 degrees is formed between the plane of the first bent area and the plane of the second bent area; the length of the coating film on the outer curved side of the first curved region is greater than the length of the coating film on the inner curved side of the first curved region, and the length of the coating film on the outer curved side of the second curved region is greater than the length of the coating film on the inner curved side of the second curved region.

Through adopting above-mentioned technical scheme, vena cava is implanted to first curved district, and portal vein is implanted to the curved district of second to adapt to the approximate S-shaped three-dimensional space relation between portal vein and the vena cava, improve the unobstructed rate of tectorial membrane support, improve portal hypertension treatment.

Optionally, the stent includes a plurality of wavy rings, and the wavy rings are arranged at intervals along the extending direction of the conformal covered stent.

By adopting the technical scheme, the wavy circular ring can be formed by cutting a medical shape memory thin-wall metal pipe or integrally injection-molded by a biomedical shape memory polymer material.

Optionally, the cover has a first pleat forming the conformable stent-graft into a first bend region, and the first pleat is located on an inner bend side of the first bend region of the conformable stent-graft.

Through adopting above-mentioned technical scheme, the support receives the constraint of tectorial membrane in first curved region department and forms first curved region to adapt to the shape of vena cava.

Optionally, the support still includes first arc skeleton, first arc skeleton is located the interior curved side position in first curved district, and just first arc skeleton is connected with two at least cockscomb structure rings that are located first curved district.

By adopting the technical scheme, the shape stability of the film-coated stent in the first bending area is improved.

Optionally, the cover has a second pleat forming a second bend region of the conformable covered stent, and the second pleat is located on an inner bend side of the second bend region of the conformable covered stent.

Through adopting above-mentioned technical scheme, the support receives the constraint of tectorial membrane in second curved region department and forms the second curved region to adapt to the shape of portal vein.

Optionally, the support still includes second arc skeleton, second arc skeleton is located the interior curved side position in the curved district of second, and second arc skeleton and two at least cockscomb structure rings that are located the curved district of second are connected.

By adopting the technical scheme, the shape stability of the film-coated stent in the second bending area is improved.

Optionally, the stent is sleeved outside the covering membrane.

Through adopting above-mentioned technical scheme, the smooth of tectorial membrane support internal surface reduces the foreign matter and adheres to the probability.

In summary, the present application has the following beneficial effects:

first, this application adapts to the approximate S-shaped three-dimensional space relation between portal vein and vena cava, improves the unobstructed rate of tectorial membrane support, improves portal hypertension treatment.

Second, this application adds first arc skeleton and second arc skeleton to improve the shape stability of tectorial membrane support in first curved district and the curved district of second.

Drawings

FIG. 1 is a schematic structural view of a conformable stent graft for transjugular intrahepatic portosystemic shunt according to one embodiment of the present application;

fig. 2 is a schematic structural view of a conformable stent graft for transjugular intravenous intrahepatic portosystemic shunt according to example two of the present application.

In the figure, 1, a coating; 11. a first fold; 12. a second fold; 2. a wave-shaped circular ring; 3. a first bend region; 4. a second bend region; 5. a first arc-shaped framework; 6. a second arc-shaped framework.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a conformal covered stent for transjugular internal vein intrahepatic portal shunt, as shown in fig. 1, the stent is of a cylindrical structure and comprises a covering film 1 and a stent sleeved outside the covering film 1, and the stent and the covering film 1 are connected in a sewing mode.

The stent comprises a plurality of wavy circular rings 2, and the wavy circular rings 2 are arranged at intervals along the extending direction of the conformal covered stent. The wave-shaped circular ring 2 can be formed by cutting a medical shape memory thin-wall metal pipe or integrally injection molding a biomedical shape memory polymer material.

The conformal covered stent has a first curved region 3 implanted in the vena cava and a second curved region 4 implanted in the portal vein, and an included angle of 60-180 degrees is formed between the plane of the first curved region 3 and the plane of the second curved region 4. The included angle between the plane of the first bending zone 3 and the plane of the second bending zone 4 can be made into the conformal covered stent with the specifications of 60 degrees, 70 degrees, 80 degrees, 90 degrees, 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, 160 degrees, 170 degrees, 180 degrees, and the like. For convenience of illustration, the present application will be described with reference to the first bend 3 being at an angle of 180 ° to the second bend 4.

The length of the film 1 on the outer curved side of the first curved region 3 is greater than the length of the film 1 on the inner curved side of the first curved region 3. The cover membrane 1 has a first fold 11 that forms the compliant stent graft into a first bend region 3, the first fold 11 is located on the inner curve side of the first bend region 3 of the compliant stent graft, and the first fold is formed by overlapping and sewing the cover membrane 1.

The length of the film 1 on the outer curved side of the second curved region 4 is greater than the length of the film 1 on the inner curved side of the second curved region 4. The cover membrane 1 has a second fold 12 that forms the compliant stent graft into the second bend region 4, the second fold 12 is located on the inside curve side of the second bend region 4 of the compliant stent graft, and the second fold is formed by overlapping and sewing the cover membrane 1.

The implementation principle of the embodiment is as follows: the first bending area 3 is implanted into the vena cava, and the second bending area 4 is implanted into the portal vein to adapt to the approximately S-shaped three-dimensional space relationship between the portal vein and the vena cava, so that the patency rate of the covered stent is improved, and the treatment effect of portal hypertension is improved.

The second embodiment of the present application further discloses a conformal covered stent for transjugular intravenous intrahepatic portal shunt, as shown in fig. 2, and the second embodiment is different from the first embodiment in that the stent further comprises a first arc-shaped framework 5 and a second arc-shaped framework 6. First arc skeleton 5 is located the interior curve side position of first curved district 3, and just first arc skeleton 5 is connected with two at least cockscomb structure rings that are located first curved district 3, and the formation of connecting includes welding, ligature. Second arc skeleton 6 is located the interior curve side position of the curved district 4 of second, and second arc skeleton 6 welds with two at least cockscomb structure rings that are located the curved district 4 of second, and the formation of connecting includes welding, ligature.

The implementation principle of the embodiment is as follows: the same as the first embodiment.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A conformal covered stent for transjugular intrahepatic portosystemic shunt is of a cylindrical structure and comprises a covered membrane (1) and a stent which are sleeved, and is characterized in that the conformal covered stent has a first curved region (3) implanted into a vena cava and a second curved region (4) implanted into a portal vein, and an included angle of 60-180 degrees is formed between the plane where the first curved region (3) is located and the plane where the second curved region (4) is located; the length of the coating film (1) on the outer curved side of the first curved area (3) is larger than the length of the coating film (1) on the inner curved side of the first curved area (3), and the length of the coating film (1) on the outer curved side of the second curved area (4) is larger than the length of the coating film (1) on the inner curved side of the second curved area (4).

2. The conformable stent-graft of claim 1, wherein the stent comprises a plurality of undulating rings (2), the plurality of undulating rings (2) being spaced apart along the direction of extent of the conformable stent-graft.

3. The conformable stent-graft of claim 1, wherein the stent-graft (1) has first pleats (11) forming the first bend region (3) of the stent-graft, and the first pleats (11) are located on the inner bend side of the first bend region (3) of the stent-graft.

4. The conformable stent-graft of claim 3, wherein the stent further comprises a first arcuate scaffold (5), the first arcuate scaffold (5) being located at an inner curve position of the first curve region (3), and the first arcuate scaffold (5) being connected to at least two jagged circular rings located at the first curve region (3).

5. The conformable stent-graft of claim 1, wherein the stent-graft (1) has second pleats (12) forming the second bend region (4) of the stent-graft, and the second pleats (12) are located on the inner bend side of the second bend region (4) of the stent-graft.

6. The conformable stent-graft of claim 5, wherein the stent further comprises a second arcuate scaffold (6), the second arcuate scaffold (6) being located at a medial curvature of the second bending zone (4), and the second arcuate scaffold (6) being connected to at least two jagged circular rings located at the second bending zone (4).

7. The conformable stent-graft of claim 1, wherein the stent is sleeved outside of the stent-graft (1).