Implantable fiber-optic sensing system

In-vitro and in-vivo measurement of the animal’s middle ear acoustical response by partially implantable fiber-optic sensing system.
The main obstacle in realization of a totally implantable hearing aid is a lack of reliable implantable microphone. In this paper we have described a potentially miniature fiber-optic vibrometer based on a modified Michelson interferometer, designed to serve as a middle-ear microphone for totally implantable cochlear- or middle-ear hearing aids. A model of the sensing system was used for in-vitro and in-vivo investigation of acoustical response of sheep’s middle-ear ossicles.
The histological examination of temporal bones of cadaver animals and the intensity of in-vivo optical signal demonstrated that the aiming of the sensing fiber to the target has been preserved for five months after the implantation.
Djinović Z, Pavelka R, Tomić M, Sprinzl G, Plenk H, Losert U, Bergmeister H, Plasenzotti R. 2018 Apr 30;103:176-181. doi: 10.1016/j.bios.2017.12.015. Epub 2017 Dec 10.
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