News

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: https://twitter.com/newscientist/status/493530033705603072/photo/1


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!

Low-Power Head-Mounted
Deep Brain Stimulator

The Deep Brain Stimulation (DBS) therapy involves implantation of small electrodes in deep brain structures, connected to a pulse generator, which is so bulky that it should to be implanted in the upper chest wall and wired subcutaneously to the electrode contacts emerging from the top of the head. According to several studies the subcutaneous extension wires and their connectors are a source of morbidity for patients and the primary cause of mechanical failure in DBS implants.

The main objective of this research is to develop a significantly smaller, more efficient, integrated microstimulator that can be practically attached to the head at the point of electrode entry to the brain. Existing DBS circuits can only control the pulse width, frequency, and either voltage or current amplitude. Voltage-controlled stimulation (VCS) provides greater power-efficiency but it can only be used when the electrodenand tissue impedances are well known. Current-controlled stimulation (CCS) is safer and provides more control over the stimulus parameters, but it consumes more power. Today’s DBS implants, which have inherited the heart pacemaker technology, are VCS-based and manufacturers have to indicate the safety limits by providing tables in terms of the electrode/tissue impedance, pulse width, and pulse amplitude.

DBS Prototype Board: This wirelessly controlled DBS prototype can generate three types of stimulus pulses based on VCS, CCS, and SCS stimulation strategies. This system can accurately measure the amount of charge injected into the tissue.


We have designed novel switched-capacitor based stimulation (SCS) circuitry that directly controls the amount of injected charge into the neural tissue. This is accomplished by generating charge-controlled, exponentially decaying bursts of stimulus pulses. The SCS circuit combines the power efficiency of the VCS circuits with the safety and stimulation parameter controllability of the CCS circuits. This innovative technique is expected to substantially simplify the pulse generator architecture and reduce its size and power requirements.

As part of this research we use Finite Element Analysis (FEA) to explore the impact of microstimulating arrays on biological tissue and distribution of current as a function of electrodes geometry, configuration, and stimulus waveforms. Techniques to determine the electric field, potential, current densities, and heat distributions are used to determine the feasibility and efficacy of an electrode design. Using these 3-Dimensional models, alternative layouts and electrode designs can be evaluated prior to prototyping. Further, these models can be applied to several different types of electrodes including cortical, cochlear, and retinal in addition to deep-brain stimulating electrodes.

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