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Biomedical Engineering / Biomedizinische Technik

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering and the German Society of Biomaterials

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Volume 63, Issue 6


Volume 57 (2012)

Sensitivity enhancement of a folded beam MEMS capacitive accelerometer-based microphone for fully implantable hearing application

Apoorva Dwivedi
  • Corresponding author
  • Electronics and Communications Engineering Department, NIT Hamirpur, Hamirpur 177005, Himachal Pradesh, India, Phone: +91-7831059900, Fax: 01972-223834
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Gargi Khanna
  • Electronics and Communications Engineering Department, NIT Hamirpur, Hamirpur 177005, Himachal Pradesh, India
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-10-31 | DOI: https://doi.org/10.1515/bmt-2016-0181


The present work attempts to enhance the sensitivity of a folded beam microelectromechanical systems (MEMS) capacitive accelerometer by optimising the device geometry. The accelerometer is intended to serve as a microphone in the fully implantable hearing application which can be surgically implanted in the middle ear bone structure. For the efficient design of the accelerometer as a fully implantable biomedical device, the design parameters such as size, weight and resonant frequency have been considered. The geometrical parameters are varied to obtain the optimum sensitivity considering the design constraints and the stability of the structure. The optimised design is simulated and verified using COMSOL MULTIPHYSICS 4.2. The stability of the device is ensured using eigenfrequency analysis. Optimised results of the device geometry are presented and discussed. The accelerometer has a sensing area of 1 mm2 and attains a nominal capacitance of 5.3 pF and an optimum sensitivity of 6.89 fF.

Keywords: accelerometer; hearing aid; hearing impairment; implantable; microelectromechanical system (MEMS); middle ear implant


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About the article

Received: 2016-09-09

Accepted: 2017-08-17

Published Online: 2017-10-31

Published in Print: 2018-11-27

Citation Information: Biomedical Engineering / Biomedizinische Technik, Volume 63, Issue 6, Pages 699–708, ISSN (Online) 1862-278X, ISSN (Print) 0013-5585, DOI: https://doi.org/10.1515/bmt-2016-0181.

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