Production method for a ring electrode

1. A production method for a ring electrode, comprising:

providing an outer element, which comprises an outer tube;

providing a first inner element, which comprises a first inner tube having a first core of a sacrificial material;

providing a second inner element, which comprises a second core of a sacrificial material;

forming a composite tube by arranging the first inner element and the second inner element inside the outer element, the first inner element and the second inner element being arranged off-center with respect to one another;

drawing the composite tube in a longitudinal direction of the composite tube;

separating a composite tube disk from the composite tube;

removing the sacrificial material of the first core; and

removing the sacrificial material of the second core in order to obtain a contacting opening in the ring electrode.

2. The method of claim 1 , wherein the removal of the sacrificial material of the first core and/or of the sacrificial material of the second core is corrosion or etching.

3. The method of claim 1 , wherein the removal of the sacrificial material of the first core and/or of the sacrificial material of the second core is carried out with the aid of an acid comprising nitric acid, hydrochloric acid and/or hydrogen peroxide.

4. The method of claim 1 , wherein the sacrificial material of the first core and/or the sacrificial material of the second core is less noble than the material of the outer tube and/or of the first inner tube.

5. The method of claim 1 , wherein the outer tube and/or the first inner tube comprises one of a noble metal, a noble metal alloy, and a platinum-iridium alloy.

6. The method of claim 1 , wherein the first core of sacrificial material and/or the second core of sacrificial material comprises a non-noble metal alloy, and copper and/or MP35N.

7. The method of claim 1 , wherein the drawing of the composite tube is carried out with a deformation factor of between 3 and 25% per individual drawing.

8. The method of claim 1 , wherein the diameter of the first inner element is greater than the diameter of the second inner element.

9. The method of claim 1 , wherein the second inner element comprises a second inner tube, which encloses the second core.

10. The method of claim 1 further comprising:

providing a third inner element, which comprises a third core of a sacrificial material;

forming the composite tube by arranging the third inner element inside the outer element, the first, second and third inner elements being arranged off-center with respect to one another; and

removing the sacrificial material of the third core.

11. The method of claim 1 , wherein the production method does not comprise a recrystallization method.

12. A ring electrode, comprising:

an outer element;

a first inner element; and

a second inner element;

wherein the outer element comprises an outer tube;

wherein the first inner element and the second inner element are arranged inside the outer element, and the first inner element and the second inner element are arranged off-center with respect to one another, in order to form a composite tube;

wherein the outer element, the first inner element and the second inner element are drawn together in a longitudinal direction of the composite tube;

wherein the first inner element has a first inner tube, which encloses a first cavity from which a sacrificial material has been removed; and

wherein the second inner element encloses a second cavity from which a sacrificial material has been removed, and which forms a contacting opening in the ring electrode.

13. The ring electrode of claim 12 , wherein the ring electrode, as seen in a cross section, has a boundary line between the outer element and the first inner element.

14. The ring electrode of claim 12 configured in an electrode system and further comprising a conductor element, wherein the conductor element is connected to a contacting opening in the ring electrode.

15. The ring electrode of claim 12 configured in a cardiac pacemaker and/or for neurostimulation.