Self-sufficient neural tissue stimulator

A neural tissue stimulator, comprising

• a multiple of microneedles forming an array of microneedles;
• a chip comprising at least one comparator with adaptive level, a sequence control circuit, at least one capacitor stack built by n capacitors and 2n switches, at least one buffer capacitor outside the at least one capacitor stack, at least two additional switches outside the at least one capacitor stack and a CMOS-Logic, wherein n∈N;
• wherein the n capacitors are adapted to be sequentially charged by at least one microneedle of the array of microneedles, which functions as DC input source, one after the other and wherein the 2n switches of the capacitor stack couple the n capacitors selectively to at least one microneedle of the array of microneedles and wherein the buffer capacitor outside the at least one capacitor stack is dedicated to be charged from the n capacitors of the capacitor stack at once;
• an interposer layer comprising holes for the multiple of microneedles;
• a lid;
• at least one startup circuit device;
• wherein the chip, is located on one surface of the interposer layer;
• wherein the lid and the interposer layer form a capsule for the chip;
• wherein each microneedle has a distal end which protrudes from the chip;
• wherein
• the neural tissue stimulator is adapted to be electrically self-sufficient due to harvesting of electrical energy from neural cells;
• and
• the distal ends of at least two microneedles of the array of microneedles have a different electrical insolation.