Electrode arrangement for electrical stimulation of biological material, and a multi-electrode array for use in such an electrode arrangement

1. An electrode arrangement for electrical stimulation of biological material, comprising:

at least one stimulation electrode via which the biological material can be fed a stimulus signal;

at least one counter electrode which forms a counter pole to the stimulation electrode;

at least one sensor electrode configured to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode is distinct from the stimulation and counter electrodes; and

a control loop configured to vary at least one parameter of the stimulus signal as a function of the determined polarization voltage.

2. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, which electrode arrangement further includes a memory in which a maximum value of the polarization voltage can be stored, wherein the memory can be written to and/or read from in a wireless fashion.

3. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode is arranged concentrically with the stimulation electrode.

4. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode at least partially surrounds the stimulation electrode.

5. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode is arranged in a cutout in the stimulation electrode.

6. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode and the stimulation electrode are planar structures.

7. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode is small by comparison with the stimulation electrode.

8. An electrode arrangement for electrical stimulation of biological material comprising;

at least one stimulation electrode via which the biological material can be fed a stimulus signal;

at least one counter electrode which forms a counter pole to the stimulation electrode;

at least one sensor electrode configured to determine a polarization voltage across the stimulation electrode, wherein the sensor electrode and the stimulation electrode are produced from the same materials, and wherein the sensor electrode is distinct from the stimulation and counter electrodes.

9. An electrode arrangement for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, wherein a multiplicity of stimulation electrodes and a multiplicity of sensor electrodes are arranged on a common substrate.

10. The electrode arrangement of claim 9 , wherein at least one sensor electrode is arranged in the region of each stimulation electrode.

11. A retina implant for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode.

12. The retina implant of claim 11 , wherein a multiplicity of stimulation electrodes and a multiplicity of sensor electrodes are arranged on a common substrate.

13. The retina implant of claim 12 , which further includes a difference element with at least two inputs, a first input being connected to the stimulation electrode, and a second input being connected to the sensor electrode.

14. A retina implant for electrical stimulation of biological material, having at least one stimulation electrode via which the biological material can be fed a stimulus signal, and having at least one counter electrode which forms a counter pole to the stimulation electrode, wherein at least one sensor electrode is provided with the aid of which it is possible to determine a polarization voltage across the stimulation electrode, and wherein a multiplicity of stimulation electrodes and a multiplicity of sensor electrodes are arranged on a common substrate.

15. The retina implant of claim 14 , which further includes an interrupter which interrupts the stimulus signal as a function of the determined polarization voltage.

16. The retina implant of claim 15 , wherein the interrupter is a changeover switch which short-circuits the stimulation electrode and the counter electrode.

17. The retina implant of claim 14 , wherein the sensor electrode is arranged in the immediate vicinity of the stimulation electrode.

18. The retina implant of claim 14 , wherein the sensor electrode is arranged next to the stimulation electrode.

19. The retina implant of claim 14 , which further includes a difference element with at least two inputs, a first input being connected to the stimulation electrode, and a second input being connected to the sensor electrode.

20. The retina implant of claim 19 , which further includes an interrupter which interrupts the stimulus signal as a function of the determined polarization voltage.

21. The retina implant of claim 20 , wherein the interrupter is a changeover switch which short-circuits the stimulation electrode and the counter electrode.