Stimulating auditory nerve with MEMS harvesters for fully implantable and self-powered cochlear implants

Beker, Levent
Zorlu, Ozge
Goksu, Nebil
Külah, Haluk
This paper presents a novel method for stimulating auditory nerve inside cochlea via a MEMS piezoelectric energy harvester (PEH) implanted on eardrum or ossicles 1 . In this method, the harvester composed of several cantilevers with varying resonance frequencies within the hearing band is utilized. The signals generated by each cantilever of the PEH are used to stimulate the corresponding section of the auditory nerve. The proposed method mimics the natural operation of cochlea, therefore eliminates the use of microphone, sound processor, battery, and transmitter that are currently used in conventional cochlear implants (CI's). In this framework, a single-cantilever MEMS PEH prototype is designed and fabricated. The prototype generates adequate signal to stimulate the auditory nerve at a typical eardrum vibration, proving the method's feasibility for the next generation fully implantable and self-powered CI's.


Investigating pain perception in somatosensory cortex for healthy and fibromyalgia patient populations by using fNIRS
Eken, Aykut; Gökçay, Didem; Kara, Murat; Department of Medical Informatics (2016)
In this study, we investigated the difference in hemodynamic responses between fibromyalgia (FM) and healthy controls via functional near infrared spectroscopy (fNIRS) during application of painful stimulus and transcutaneous electrical nerve stimulation (TENS). We collected several clinical data (pain threshold, Beck Depression Inventory (BDI) score, Fibromyalgia Impact Questionnaire (FIQ) score, pain ratings) before and during the experiment. After data collection, we analyzed it using general linear mode...
Neural stimulation interface with ultra-low power signal conditioning circuit for fully-implantable cochlear implants
Ulusan, Hasan; Chamanian, Salar; Zorlu, Ozge; Muhtaroglu, Ali; Külah, Haluk (2018-03-23)
This paper presents an ultra-low power interface circuit to stimulate auditory nerves through fully-implantable cochlear implants (FICIs). The interface circuit senses signals generated from a multi-frequency piezoelectric sensor array, and generates neural stimulation current according to input sound level. Firstly, piezoelectric sensor output is amplified, and compressed with an ultra-low power logarithmic amplifier (LA). This significantly reduces power by eliminating the compression in the next stages. ...
A Study of Prosthetic Heart Valve Sounds
Koymen, Hayrettin; Altay, Bulent K.; Ider, Yusuf Ziya (Institute of Electrical and Electronics Engineers (IEEE), 1987-11)
In this paper a new mechanism is proposed for the generation of phonocardiogram (PCG) sounds from implanted mechanical prosthetic heart valves. The structures in the chest, the heart, its partitions, and major vessels, constitute a frequency selective system excited by the rapidly decelerating valve occluder. It is shown that the source, the rapidly decelerating valve, has a wide and flat power spectrum and hence is an impulsive excitation that couples energy to the resonance modes specified by the structur...
Fully Implantable Cochlear Implant Interface Electronics With 51.2-mu W Front-End Circuit
Ulusan, Hasan; Chamanian, Salar; Ilik, Bedirhan; Muhtaroglu, Ali; Külah, Haluk (2019-07-01)
This paper presents an ultralow power interface circuit for a fully implantable cochlear implant (FICI) system that stimulates the auditory nerves inside cochlea. The input sound is detected with a multifrequency piezoelectric (PZT) sensor array, is signal-processed through a front-end circuit module, and is delivered to the nerves through current stimulation in proportion to the sound level. The front-end unit reduces the power dissipation by combining amplification and compression of the sensor output thr...
Thin-Film PZT based Multi-Channel Acoustic MEMS Transducer for Cochlear Implant Applications
Yüksel, Muhammed Berat; Külah, Haluk (2021-01-01)
AuthorThis paper presents a multi-channel acoustic transducer that works within the audible frequency range (250-5500 Hz) and mimics the operation of the cochlea by filtering incoming sound. The transducer is composed of eight thin film piezoelectric cantilever beams with different resonance frequencies. The transducer is well suited to be implanted in middle ear cavity with an active volume of 5 mm × 5 mm × 0.62 mm and mass of 4.8 mg. Resonance frequencies and piezoelectric outputs of the bea...
Citation Formats
L. Beker, O. Zorlu, N. Goksu, and H. Külah, “Stimulating auditory nerve with MEMS harvesters for fully implantable and self-powered cochlear implants,” 2013, Accessed: 00, 2020. [Online]. Available: