Charge balanced neural stimulation interface circuit for fully implantable cochlear implants

Date

2020

Author

Yiğit, Halil Andaç

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

399
views

0
downloads

Cochlear implants (CI) are the most successful prosthesis, which helps people suffering from profound deafness; however, aesthetic concerns and daily battery replacement are the main problems. These problems can be solved by a low power fully implantable cochlear implant (FICI). The FICI system should operate with ultra-low power consumption while covering high input dynamic range. Moreover. the system should ensure safe stimulation with single battery usage. In this thesis, a low power FICI interface circuit is designed while focusing on the charge balanced stimulation and single supply implantation. The interface circuit takes input from multi-channel piezoelectric transducers and stimulates the electrodes with pulse width modulated output currents. By pulse width modulation, a time gap is formed between two consecutive channels, and this gap is used for charge balancing operation. The system is tested with an in-vitro test setup and it safely stimulates the single channel cochlear electrode with 50 dB input dynamic range while consuming lower than 800 μW power from a single 1.8 V supply

Subject Keywords

Implants, Artificial., Keywords: Charge balance, cochlear implants, low power electronics, neural stimulation.

URI

http://etd.lib.metu.edu.tr/upload/12625476/index.pdf
https://hdl.handle.net/11511/45691

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Ultra-low power interface electronics design for fully implantable cochlear implants Uluşan, Hasan; Külah, Haluk; Muhtaroğlu, Ali; Department of Electrical and Electronics Engineering (2018) Cochlear implants are one of the most successful neural prosthesis where users could go from being profoundly deaf to enjoying high degree of speech perception. However, subsequent aesthetic concerns, damage risks and high power dissipation associated with bulky external units of cochlear implants have redirected recent studies to fully implantable cochlear implants (FICI). Although, implantable sensors occupies the largest portion of the previous researches on FICIs, design of the low powered signal condit...
LOW POWER HIGHLY PROGRAMMABLE ANALOG FRONT-END FOR 12-CHANNEL FULLY IMPLANTABLE COCHLEAR IMPLANTS Özbek, Abdurrahman Berkay; Külah, Haluk; Department of Electrical and Electronics Engineering (2021-12-17) Cochlear implants are the most common treatment option for individuals with sensorineural hearing loss. However, despite the functional success, the patients have concerns about the aesthetics and practicality of the device. Fully implantable cochlear implants (FICI), on the other hand, have a promising future to overcome these drawbacks by replacing the external components with an acoustic sensor and interface electronics. To achieve a high quality of hearing, the interface electronics should effectively d...
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. ...
Single Supply PWM Fully Implantable Cochlear Implant Interface Circuit with Active Charge Balancing Yigit, H. Andac; Ulusan, Hasan; Koc, Mert; Yüksel, Muhammed Berat; Chamanian, Salar; Külah, Haluk (2021-01-01) Low powered fully implantable cochlear implants (FICIs) untangle the aesthetic concerns and battery replacement problems of conventional cochlear implants. However, the reported FICIs lack proper charge balancing and require multiple external supplies to operate. In this work, a complete low power FICI interface circuit is designed that operates with a single supply and uses short-pulse-injection method for charge balancing. The system takes input from multi-channel piezoelectric transducers and stimulates ...
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...

Citation Formats

H. A. Yiğit, “Charge balanced neural stimulation interface circuit for fully implantable cochlear implants,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering., Middle East Technical University, 2020.