Endoprosthesis
An endoprosthesis, in particular an intraluminal endoprosthesis, for example a stent, having a base body composed at least partially of a metallic material, and having a functional element which is attached to the base body or imbedded therein and which contains material that is radiopaque and/or X-ray opaque and has a different material composition, at least in a portion of its volume, compared to the material of the base body. To avoid contact corrosion and undesired corrosion, the functional element is provided with a barrier layer which electrically insulates the radiopaque and/or X-ray opaque material from the base body.
1. An endoprosthesis having a base body composed at least partially of a metallic material, and having a functional element which is attached to the base body or imbedded therein and which contains material that is radiopaque and/or X-ray opaque and has a different material composition, at least in a portion of its volume, compared to the material of the base body, characterized in that:
the functional element comprises two through openings and a barrier layer which electrically insulates the radiopaque and/or X-ray opaque material from the base body; and
the base body comprises two finger elements that extend entirely through the through openings on a same functional element and are bent or rotated outward from the through openings.
2. The endoprosthesis according to claim 1 , characterized in that the barrier layer completely encloses the radiopaque or X-ray opaque material.
3. The endoprosthesis according to claim 1 , characterized in that the barrier layer contains one or more materials selected from the group consisting of a parylene, parylene C, polyzene F, silicone, gycocalyx, diamond-like carbon (DLC), a cyanoacrylate, methyl-2-cyanoacrylate, n-butyl cyanoacrylate, 2-octyl-cyanoacrylate, and titanium dioxide.
4. The endoprosthesis according to claim 1 , characterized in that the barrier layer encloses a volume of the radiopaque and/or X-ray opaque material of one or more adjacent functional elements with a cross-sectional area of at least approximately 200 μm by approximately 100 μm, and/or with an extension in one direction of at least approximately 300 μm, and/or with an extension corresponding to two pixels resolution of angiography devices.
5. The endoprosthesis according to claim 1 , characterized in that the base body contains a biodegradable material comprising magnesium and/or a magnesium alloy.
6. The endoprosthesis according to claim 1 , characterized in that the functional element together with the surrounding barrier layer has a wire-shaped design.
7. The endoprosthesis according to claim 1 , characterized in that the two finger elements are made of the same material as the base body.
8. The endoprosthesis according to claim 5 , characterized in that the two finger elements are made of the same material as the base body.
9. An endoprosthesis having a base body composed at least partially of a metallic material, and having a functional element which is attached to the base body or imbedded therein and which contains material that is radiopaque and/or X-ray opaque and has a different material composition, at least in a portion of its volume, compared to the material of the base body, characterized in that:
the functional element comprises a hollow cylinder with an opaque core and a barrier layer that completely encloses the core, which electrically insulates the radiopaque and/or X-ray opaque material from the base body, the functional element further comprising a circumferential groove on a lateral surface; and
the base body comprises a forked element comprising an annular section that is situated in the circumferential groove.
10. The endoprosthesis according to claim 9 , characterized in that the barrier layer contains one or more materials selected from the group consisting of a parylene, parylene C, polyzene F, silicone, gycocalyx, diamond-like carbon (DLC), a cyanoacrylate, methyl-2-cyanoacrylate, n-butyl cyanoacrylate, 2-octyl-cyanoacrylate, and titanium dioxide.
11. The endoprosthesis according to claim 9 , characterized in that the barrier layer encloses a volume of the radiopaque and/or X-ray opaque material of one or more adjacent functional elements with a cross-sectional area of at least approximately 200 μm by approximately 100 μm, and/or with an extension in one direction of at least approximately 300 μm, and/or with an extension corresponding to two pixels resolution of angiography devices.
12. The endoprosthesis according to claim 9 , characterized in that the base body contains a biodegradable material comprising magnesium and/or a magnesium alloy.
13. The endoprosthesis according to claim 12 , characterized in that the forked element is made of the same material as the base body.
14. The endoprosthesis according to claim 9 , characterized in that the forked element is made of the same material as the base body.