Fabrication for ultra-compliant probes for neural and other tissues
Methods of fabricating ultra-miniature, ultra-compliant probe arrays through spin coating, wherein a dissolvable material in hydrogel form is dispensed onto an assembled mold with wires. Once the dissolvable material is dispensed onto the mold, centrifuging spin casts the material by evaporating the solvent, forming a dried dissolvable polymer. Finally, a device is used with water to remove excess dissolvable material to obtain a dissolvable needle with wires.
1. A method of spin coating fabrication of needle for a neural probe comprising:
providing a top mold and a bottom mold to form an assembled mold with wires;
dispensing a dissolvable material in a hydrogel form onto the assembled mold with the wires;
centrifuging the dissolvable material to spin-cast the dissolvable material by evaporating solvent to form a dried dissolvable polymer; and
using a wiping device with intermittent applications of water to remove excess dissolvable material to obtain needle shape only in the assembled mold with the wires to form a final dissolvable needle with wires embedded.
2. The method according to claim 1 , further comprising the step of using a precision assembly approach to assemble a top mold onto a wired bottom Si mold to form the assembled with the wires.
3. The method according to claim 1 , further comprising the step of using a device bonder to assemble a top mold onto a wired bottom mold to form the assembled mold with the wires.
4. The method according to claim 1 , wherein the dissolvable material is carboxymethyl cellulose (CMC) or a combination of CMC and at least one of sucrose, glucose, maltodextrin, poly(vinylpyrrolidone), polyvinyl alcohol, maltose, polyactic acid.
5. The method according to claim 1 , wherein the hydrogel is prepared by mixing powdered carboxymethyl cellulose (CMC) with water.
6. The method according to claim 1 , wherein the solvent is water.
7. The method according to claim 1 , wherein the step of centrifuging is performed at 20 deg. C at 4700 rpm spinning speed, and for 5 hours.