AUTHOR=Kohler Alina , Blendinger Felix , Müller Sonja , Mescheder Ulrich , Bucher Volker 

TITLE=Feasibility of Parylene C for encapsulating piezoelectric actuators in active medical implants

JOURNAL=Frontiers in Medical Technology

VOLUME=Volume 5 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/medical-technology/articles/10.3389/fmedt.2023.1211423

DOI=10.3389/fmedt.2023.1211423

ISSN=2673-3129

ABSTRACT=Parylene C is well known as an encapsulation material for medical implants. Within the approach of miniaturization and automatization of a bone distractor piezoelectric actuators were encapsulated with Parylene C. The properties of the polymer were investigated on its stretchability with respect to the encapsulation functionality of piezoelectric chips. We determined a linear yield strain of 1% of approx. 12 µm thick Parylene C foil. The Parylene C encapsulation withstands the mechanical stress of a minimum of 5 • 10 5 duty cycles by continuous actuation. The experiments demonstrate that elongation of the encapsulation on piezoelectric actuators and thus the elongation of Parylene C up to 0.8 mm is feasible.