August 2014

Congratulations to Temi for winning the best student paper competition award at the IEEE EMBC'14. All of us here at the GT Bionics lab are proud of you!

GT Bionics participated in the 36th Annual IEEE Engineering in Medicine and Biology Conference in Chicago with 6 papers.

July 2014

A new story featuring the Tongue Drive System was published in the New Scientist. Here's the twitter link:

Congratulations to Dr. Mehdi Kiani for accepting a faculty position at Penn State. We at the GT Bionics lab look forward to you making us all proud. We'll miss you!

Congratulations to Dr. Mehdi Kiani for accepting a faculty position at Penn State. We at the GT Bionics lab look forward to you making us all proud. We'll miss you!

Congratulations to Temi for her EMBC'14 paper being selected among the Open Finalists for the student competition. Her paper was titled "Tracheal Activity Recognition Based on Acoustic Signals".

June 2014

Both Shurjo and Justin were awarded PURA (President's Undergraduate Research Award) salaries for the fall of 2014. Congratulations guys!

May 2014

Congratulations to Dr. Kiani and Dr. Lee for their great achievement: Graduating from GT-Bionics Lab with their PhD degrees!

March 2014

Temi was awarded a travel award at the Georgia Tech Research and Innovation Conference 2014. Temi’s winning abstract/poster was titled “A Wireless, Wearable Neckwear System for Health Monitoring”. Congratulations Temi!

Hyung-Min Lee successfully defended his thesis titled “A Power-Efficient Wireless Neural Stimulating System with Inductive Power Transmission.” Congratulatiosn Hyung-Min!

Mehdi Kiani was chosen for Sigma Xi PhD thesis awards which will be presented at the Georgia Tech Sigma Xi Awards Dinner on April 10th. Mehdi's thesis was entitled "Wireless Power and Data Transmission to High-Performance Implantable Medical Devices." Congratulations Mehdi!

January 2014

NIH-NIBIB coverage of the results of the TDS clinical study: Tongue-Driven Wheelchair Out-Maneuvers the Competition

December 2013

Dr. Mehdi Kiani successfully defends his Ph.D. thesis and starts a post-doc position at GT-Bionics Lab. Congratulations Mehdi!

November 2013

Georgia Tech coverage of the results of the TDS clinical study: Tongue Drive Wheelchair

Shepherd Center coverage of the results of the TDS clinical study: Tongue Piercing Put to Medical Use

Washington Post coverage of the results of the TDS clinical study: Tongue pierce lets the paralyzed drive wheelchairs

BBC coverage of the results of the TDS clinical study: Body piercing controls wheelchair

Radio Interview: BBC World Business Report

Results of the TDS clinical study is published in Science Translational Medicine (Impact factor > 10).

October 2013

Abner's proposal was accepted to the Wireless RERC’s App Factory on design and development for a proportionally tongue-controlled mouse. Congratulations Abner!

Hyung-Min's paper titled “A Power-Efficient Switched-Capacitor Stimulating System for Electrical/Optical Deep Brain Stimulation” was accepted for presentation at ISSCC 2014. ISSCC is the flagship of IEEE conference in solid-state circuits design and system-on-a-chip. The paper was ranked 2nd among all bio-related papers and 5th in all the papers submitted to the IMMD subcommittee. Congratulations Hyung-Min!

July 2013

Shurjo was awarded PURA (President's Undergraduate Research Award) for Fall 2013 from the Undergraduate Research Opportunities Program. Congratulations Shurjo!

May 2013

Hyung-Min and Hangue's paper was accepted to IEEE J. Solid-State Circuits.

April 2013

Mallika and Jessica won ORS's People's Choice Research Award. Jessica also won the Outstanding Service Award. Congratulations!

Mehdi's paper was accepted to IEEE Trans. Circuits Syst. II.

March 2013

Mehdi passed his PhD proposal.

February 2013

Xueliang's , et al., journal paper accepted for publication in IEEE TNSRE.

Hangue's 3rd journal paper was accepted for publication in ALOG.

Seung-Bae's , et al., journal paper accepted for publication in IEEE TBME.

December 2012

Hangue and Jeonghee won Best Demo at the 2012 IEEE BioCAS Conference. Congratulations!

November 2012

Watch Dr. Ghovanloo's 2012 TEDx Peachtree talk!

April 2012

Dr. Ghovanloo and Dr. Huo had one of the most cited papers in the Journal of Neural Engineering in 2010!

Multi-Carrier Wireless Link for Implantable Biomedical Devices

An inductive link between two magnetically-coupled coils that constitute a transformer is the most common method to wirelessly transmit power and data to implantable biomedical devices that have relatively high power consumption such as neuromuscular stimulators, cochlear implants, and visual prostheses. Neuroprostheses that substitute sensory functions also need sizeable amounts of real-time data to interface with a large number of neurons by means of tens to hundreds of stimulating sites that are driven simultaneously through multiple parallel channels. The wireless link should be robust enough not to be affected by patient’s motion artifacts or minor coils misalignments. A back telemetry link is also needed for implant power regulation, stimulating sites impedance measurement, and recording the neural response for accurate electrode placement and stimulation parameter adjustments.

Therefore, high power transmission efficiency, high data transmission bandwidth, magnetic coupling insensitivity, and back telemetry are the major wireless link requirements in the design and implementation of high performance implantable biomedical devices. While these requirements are individually attainable, they have not been achieved concurrently with traditional techniques. The reason is that there are conflicting constraints involved in achieving high performance in two or more of the above system requirements.

The wireless link operating frequency, also known as the carrier frequency, is one of the most important parameters of an inductive link, which affects all other system specifications. Traditionally, a single carrier frequency has been used for (1) inductive power transmission, (2) forward data transmission from outside to the implanted device, and (3) back telemetry from the implanted device outward. In this research we are using three carrier signals at three different frequencies and amplitude levels: (a) low-frequency high-amplitude (fP < 1MHz) for power transmission, (b) medium-frequency medium-amplitude (fFD ~ 50MHz) for forward data link, and (c) high-frequency low-amplitude (fBT > 400MHz) for back telemetry. These frequencies are optimal for the above three major functions and we can effectively isolate many of the competing parameters in the design of a wireless link. Therefore, we expect to achieve a high performance in all of the aforementioned system requirements.

The research presented here is aimed at developing a robust, power-efficient, wideband, bidirectional wireless link using multiple carrier frequencies. The new link will be utilized in development of a prototype neuroprosthetic testbed for a visual prosthesis. The prototype neuroprosthesis will be tested in vitro to evaluate the multi-frequency wireless link performance in the tissue environment. Then it will be used in short term in vivo experiments.

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