Polymerization of para-xylylene derivatives (parylene polymerization). II. Heat effects during deposition of parylene C at different temperatures

A new multi-site probe array with monolithically integrated parylene flexible cable for neural prostheses

This work presents a new multi-site probe array applied with parylene technology, used for neural prostheses to record high-level cognitive neural signals. Instead of inorganic materials (e.g. silicon dioxide, silicon nitride), the electrodes and conduction traces on probes are insulated by parylene, which is a polymer material with high electrical resistivity, mechanical flexibility, biocompatibility and easy deposition process. As a result, the probes exhibit better electrical and mechanical properties. The all dry process is demonstrated to fabricate these probe arrays with monolithically integrated parylene flexible cables using double-side-polished (DSP) wafers. With the parylene flexible cables, the probes can be easily assembled to a high density 3-D array for chronic implantation.

Temperature selective deposition of Parylene-C

A new method for selectively depositing conformal, biocompatible coatings of Parylene-C on implantable integrated circuit structures is described. The technique consists of using thin film or diffused resistors to electrically heat the area where an opening in the Parylene is desired. Theoretically predicted and actual Parylene-C thickness are compared.