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Proceedings Paper

Active implant for optoacoustic natural sound enhancement
Author(s): S. Mohrdiek; M. Fretz; R. Jose James; G. Spinola Durante; T. Burch; A. Kral; A. Rettenmaier; R. Milani; M. Putkonen; W. Noell; M. Ortsiefer; A. Daly; V. Vinciguerra; C. Garnham; D. Shah
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Paper Abstract

This paper summarizes the results of an EU project called ACTION: ACTive Implant for Optoacoustic Natural sound enhancement. The project is based on a recent discovery that relatively low levels of pulsed infrared laser light are capable of triggering activity in hair cells of the partially hearing (hearing impaired) cochlea and vestibule. The aim here is the development of a self-contained, smart, highly miniaturized system to provide optoacoustic stimuli directly from an array of miniature light sources in the cochlea. Optoacoustic compound action potentials (oaCAP) are generated by the light source fully inserted into the unmodified cochlea. Previously, the same could only be achieved with external light sources connected to a fiber optic light guide. This feat is achieved by integrating custom made VCSEL arrays at a wavelength of about 1550 nm onto small flexible substrates. The laser light is collimated by a specially designed silicon-based ultra-thin lens (165 um thick) to get the energy density required for the generation of oaCAP signals. A dramatic miniaturization of the packaging technology is also required. A long term biocompatible and hermetic sapphire housing with a size of less than a 1 cubic millimeter and miniature Pt/PtIr feedthroughs is developed, using a low temperature laser assisted process for sealing. A biofouling thin film protection layer is developed to avoid fibrinogen and cell growth on the system.

Paper Details

Date Published: 8 February 2017
PDF: 8 pages
Proc. SPIE 10052, Optogenetics and Optical Manipulation, 100520K (8 February 2017); doi: 10.1117/12.2251912
Show Author Affiliations
S. Mohrdiek, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
M. Fretz, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
R. Jose James, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
G. Spinola Durante, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
T. Burch, Ctr. Suisse d’Electronique et de Microtechnique SA (Switzerland)
A. Kral, Hannover Medical School (Germany)
A. Rettenmaier, Hannover Medical School (Germany)
R. Milani, VTT Technical Research Ctr. of Finland Ltd. (Finland)
M. Putkonen, VTT Technical Research Ctr. of Finland Ltd. (Finland)
W. Noell, SUSS MicroOptics SA (Switzerland)
M. Ortsiefer, Vertilas GmbH (Germany)
A. Daly, Vertilas GmbH (Germany)
V. Vinciguerra, STMicroelectronics (Italy)
C. Garnham, MED-EL (Austria)
D. Shah, MED-EL (Austria)

Published in SPIE Proceedings Vol. 10052:
Optogenetics and Optical Manipulation
Samarendra K. Mohanty; Nitish V. Thakor; E. Duco Jansen, Editor(s)

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