Electrical multichannel system, particularly for neural stimulation
The invention relates to an electrical multichannel system ( 100 ) and to a neural stimulation and/or recording device comprising such a system. The multichannel system comprises a plurality of application components ( 130 ), e.g. stimulation electrodes, and associated access points ( 120 ) that are connected by a plurality of electrical lines ( 110 ). The resistances of these lines are adjusted to given target values, for example to equal values, by incorporating appropriate tuning sections ( 140 ) into the electrical lines. The lines may for example comprise different geometries and/or materials in the tuning sections.
1. An electrical multichannel system, comprising:
a) a plurality of application components and associated access points;
b) a multichannel track with a plurality of electrical lines, each line connecting one application component to one access point with a given target resistance and comprising a tuning-section with the following features:
the tuning-section extends between a starting-point and an end-point;
a distance between starting-point and end-point is the same for all lines;
a resistivity and a cross-section are substantially the same for all lines at their starting-point;
a resistivity and a cross-section are substantially the same for all lines at their end-point;
the resistances between starting-point and end-point differ between at least one first line and one second line.
2. The electrical multichannel system according to claim 1 , characterized in that the geometries of the first line and second line are different in their tuning sections.
3. The electrical multichannel system according to claim 1 , characterized in that the first line comprises in the tuning section a subsection composed of at least two materials.
4. The electrical multichannel system according to claim 1 , characterized in that the first line and the second line have non-matching courses of resistivity in their tuning sections.
5. An electrical multichannel system according to claim 1 , wherein
the first line is not longer than the second line;
the first and the second lines have non-matching courses of resistivity (ρ).
6. The electrical multichannel system according to claim 5 , characterized in that the first line comprises a subsection with a resistivity different from the resistivity at any point of the second line or vice versa.
7. The electrical multichannel system according to claim 5 , characterized in that the first line and the second line have different resistivities that are constant along their associated tuning sections.
8. The electrical multichannel system according to claim 5 , characterized in that said first line and the second line comprise subsections with differently doped substrates.
9. The electrical multichannel system according to claim 5 , characterized in that said first line and the second line comprise subsections with silicides.
10. The electrical multichannel system according to claim 5 , characterized in that said first line and the second line have different total lengths outside the tuning sections.
11. The electrical multichannel system according to claim 5 , characterized in that the target resistances of all of the plurality of electrical lines are equal to each other.
12. The electrical multichannel system according to claim 5 , characterized in that the plurality of electrical lines run along curved parallel paths.
13. The electrical multichannel system according to claim 5 , characterized in that the plurality of electrical lines are at least partially realized as thin-film conductors.
14. The electrical multichannel system according to claim 5 , characterized in that the application components are implantable electrodes.
15. Neural stimulation and/or recording device, comprising an electrical multichannel system according to claim 1 .