Manufacturing method for a multielectrode system

1. A manufacturing method for a multielectrode system, comprising:

providing several conductors, which are electrically conductive in their longitudinal direction,

bundling the conductors at a proximal portion of the multielectrode system by means of a sheath surrounding the conductors at least partially to form a conductor bundle configured to be used as a lead of the multielectrode system, and

providing several ring electrodes each surrounding at least partially one of the conductors at a distal portion of the multielectrode system and electrically connecting the ring electrodes and the conductors to form a multielectrode array of the multielectrode system,

wherein the multielectrode array is configured to be in a longitudinally extended or in a transversally expanded configuration; and

further comprising electrically connecting either the conductors and/or the guidewires with a distal tip portion of the multielectrode system to form a tip electrode of the multielectrode system, wherein the tip electrode is formed as a ring-shaped electrode and is further surrounded by a tip electrode insulation.

2. The manufacturing method of claim 1 , wherein the transversally expanded configuration is a spherically or a conically expanded configuration.

3. The manufacturing method of claim 1 , wherein the transversally expanded configuration is a rest position of the multielectrode array, which is changeable into the longitudinally extended configuration by inserting the multielectrode array into a sleeve or a catheter.

4. The manufacturing method of claim 1 , further comprising:

providing a tube extending within the conductor bundle,

providing a guidewire extending within the tube and the multielectrode array, and

attaching the guidewire to a distal tip portion of the multielectrode system so that a pulling of the guidewire leads to a change of the multielectrode array from the longitudinally extended to the transversally expanded configuration.

5. The manufacturing method of claim 1 , wherein the conductors comprise a shape memory alloy configured to be in the longitudinally extended and the transversally expanded configuration.

6. The manufacturing method of claim 1 , wherein the conductors are coated with a thermally shaped polymer configured to be in the longitudinally extended and the transversally expanded configuration.

7. The manufacturing method of claim 1 , wherein the transversally expanded configuration of the multielectrode array is a partially open configuration comprising accessible slits between adjacent conductors.

8. The manufacturing method of claim 1 , wherein the bundling is a heating of the sheath, which is a heat shrink.

9. The manufacturing method of claim 1 , further comprising:

providing the sheath around the conductors also in the distal portion of the multielectrode system, and

partially removing the sheath to expose at least a ring electrode portion of one of the ring electrodes.

10. The manufacturing method of claim 1 , further comprising:

providing at least one conductor and one ring electrode in the distal portion of the multielectrode system at least partially with a sub-sheath, and

partially removing the sub-sheath to expose at least a ring electrode portion of the ring electrode.

11. A multielectrode system, comprising:

several conductors, which are electrically conductive in their longitudinal direction,

a sheath surrounding the conductors at least partially to form a conductor bundle configured as a lead of the multielectrode system, and

several ring electrodes each surrounding one of the conductors at a distal portion of the multielectrode system at least partially, wherein the ring electrodes are electrically connected to the conductors to form a multielectrode array (A) of the multielectrode system, and

wherein the multielectrode array is configured to be in a longitudinally extended or in a transversally expanded configuration;

wherein at least one of the several conductors is an insulated conductor, which is electrically insulated in a direction perpendicular to its longitudinal direction;

wherein at least one of the several conductors is a strand of several wires or a bundle of several strands comprising several wires; and

wherein at least one of the wires or one of the strands is electrically insulated in a direction perpendicular to its longitudinal direction; and

wherein at least one of the conductors or the guidewire is electrically connecting with a distal tip portion of the multielectrode system to form a tip electrode of the multielectrode system, wherein the tip electrode is ring-shaped and further surrounded by a tip electrode insulation.

12. The multielectrode system of claim 11 , wherein the strand and/or the bundle comprises a sub-guidewire.

13. The multielectrode system of claim 11 , wherein at least one of the several conductors is a wire.

14. The multielectrode system of claim 11 , wherein a diameter of the multielectrode system is in a range between 0.5 and 2.5 mm and the multielectrode system comprises between 2 and 150 ring electrodes.

15. The multielectrode system of claim 11 incorporated in a multielectrode unit further comprising a pulse generator configured to control the multielectrode system.

16. The multielectrode system of claim 11 used for applications within the fields of neuro modulation, electrophysiology or cardiac rhythm management.