System for branches for endovascular endoprostheses and corresponding endoprosthesis for endovascular treatment of aortic aneurysms or dissections

1. An internal duct and fixing system for branches for endovascular endoprostheses for endovascular treatment of aortic aneurysms or dissections, said system comprising:

an endoprosthesis provided with a plurality of fenestrations;

one or more occlusions, wherein each occlusion covers one of the plurality of fenestrations and is fixed to the endoprosthesis by a suture, wherein each occlusion is removable from covering one of the plurality of fenestrations; and

a set of fixing and duct elements that forms one or more internal channels of the endoprosthesis,

wherein the set of fixing and duct elements are constructed from rigid fixing and conducting rings produced in biocompatible metallic material suitable for such devices.

2. The system, according to claim 1 , wherein the rigid fixing and conducting rings have a semi-open format, as a horseshoe, with a larger segment, a lower opening and two side rods wherein the end of each of the side rods and has an arch for the passage of a suture material to secure the rigid fixing and conducting ring to the internal wall of the endoprosthesis wherein the rigid fixing and conducting ring has a larger diameter (LargerD) with a size being of 1.8 to 2.2 times the size of its lower opening ( 342 ) in which the length of each of side rods is individually less than 70% of the size of the lower opening.

3. The system, according to claim 1 , wherein the endoprosthesis contains a channel formed by the rigid fixing and conducting rings.

4. An endoprosthesis for endovascular treatment of aortic aneurysms or dissections, wherein said endoprosthesis comprises:

a structure and a coating forming a cylindrical or conical, single or bifurcated tubular body, wherein an outer mantle of the coating is provided with fenestrations;

one or more occlusions, fixed to the coating by a suture, reversibly occluding the fenestrations; and

a set of fixing and duct elements, which can be:

a set of flexible fixing and conducting arches, individually fixed to the coating; and/or

a set of rigid fixing and conducting rings, individually fixed to the coating; wherein the set of fixing and duct elements forms one or more internal channels of the endoprosthesis.

5. The endoprosthesis according to claim 4 , wherein the fenestrations are arranged in a specific pattern in the outer mantle of the coating and are open depending on the location of the aneurysm or dissection to be treated.

6. The endoprosthesis, according to claim 4 , wherein the rigid fixing and conducting rings have a semi-open format, as a horseshoe, with a larger segment, a lower opening, and two side rods wherein the end of each of the side rods and has an arch for the passage of suture material to attach the rigid fixing and conducting ring to the endoprosthesis internal wall wherein each rigid fixing and conducting ring has a larger diameter (LargerD) with a dimension of between 1.8 to 2.2 times the size of its lower opening, wherein the length of each of the side rods is, individually, less than 70% of the size of the lower opening.

7. The endoprosthesis, according to claim 4 , wherein the endoprosthesis may contain a channel formed by flexible fixing and conducting arches or by rigid fixing and conducting rings or by both combined forms.

8. The system according to claim 1 , wherein the set of fixing and duct elements forms the one or more internal channels of the endoprosthesis in the region adjacent to one of the fenestrations.

9. The system according to claim 2 , wherein the larger diameter (LargerD) 2 times the size of its lower opening.

10. The system according to claim 2 , wherein the length of each of side rods is individually 66% of the size of the lower opening.

11. The endoprosthesis according to claim 4 , wherein the set of fixing and duct elements forms one or more internal channels of the endoprosthesis in the region adjacent to one of the fenestrations.

12. The endoprosthesis according to claim 6 , wherein the larger diameter (LargerD) 2 times the size of its lower opening.

13. The endoprosthesis according to claim 6 , wherein the length of each of side rods is individually 66% of the size of the lower opening.

14. An internal duct and fixing system for branches for endovascular endoprostheses for endovascular treatment of aortic aneurysms or dissections, said system comprising:

an endoprosthesis provided with a plurality of fenestrations;

one or more occlusions, wherein each occlusion covers one of the plurality of fenestrations and is fixed to the endoprosthesis by a suture, wherein each occlusion is removable from covering one of the plurality of fenestrations; and

a set of fixing and duct elements that forms one or more internal channels of the endoprosthesis,

wherein the set of fixing and duct elements are constructed from flexible fixing and conducting arches, formed with flexible filamentary material suitable for procedures of such kind.

15. An internal duct and fixing system for branches for endovascular endoprostheses for endovascular treatment of aortic aneurysms or dissections, said system comprising:

an endoprosthesis provided with a plurality of fenestrations;

one or more occlusions, wherein each occlusion covers one of the plurality of fenestrations and is fixed to the endoprosthesis by a suture, wherein each occlusion is removable from covering one of the plurality of fenestrations; and

a set of fixing and duct elements that forms one or more internal channels of the endoprosthesis,

wherein the endoprosthesis contains a channel formed by flexible fixing and conducting arches or by rigid fixing and conducting rings or by both combined forms.