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ALIGNMENT ALGORITHM FOR THE VESTIBULAR
PROSTHESIS
By:Brian HensleyMentors:Dr. A. ShkelIlya Chepurko
Graduate Student Team:Monty RiversAdam SchofieldAlexander Trusov
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Vestibular Prosthesis Overview There are
currently various types of VP
The overall goal of the lab is to create a totally implantable vestibular prosthesis
http://www.jvl.meei.harvard.edu/jvdl/prosthesis.html
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Motivation During surgery the implementation of
the orientation does not have to be as precise
The Vestibular Prosthesis could shift later depending what it is attached to
http://biomedcentral.inist.fr
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Project Overview Areas which I
am involved: Rotational
axes algorithm 3D Modeling
http://anorganik.uni-tuebingen.de/klaus/nmr/conventions/euler/euler.html
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Goal
http://www.stewart.cs.sdsu.edu/cs596-3dprog/lecs/index.html
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The Vestibular Organs
http://www.neuroanatomy.wisc.edu/virtualbrain/BrainStem/13VNAN.html
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How the Signal Travels
Natural System Vestibular Prosthesis
http://anatomy.iupui.edu/courses/histo_D502/D502f04/lecture.f04/Earf04/Ear.f04.htmlhttp://www.psconsulting.net.au/ttraining.html
Gyroscope
Transfer Function
RotationalAxis
Algorithm
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Transfer Function The flow rate of endolymph in the ear
was characterized in the following equation, by Fernandez and Goldberg in 1971:
)1()1(1
1)(
21 sss
ssfsH L
A
A
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Graph of Model
Graphic by Ilya Chepurko
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Rotational Algorithm-Scalar Projection
http://www.nixfiles.com/critters/proposal-slides.html
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Tests Electrical
Simulation Single Gyroscope
on rate table Flat Inclined
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Electrical Simulation Wanted to see if the microchip
accurately responded to input voltage by producing graph of transfer function
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Results of Electrical Simulation
Graphic by Ilya Chepurko
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Rate Table Test of a Single Gyro The Flat Tests
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Results of Rotation without Incline
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Incline Test Did not have a tilt
table to test, had to improvise
Used 4 different objects to prop gyro up against giving 4 angles: 8.45 28.38 50.31 59.32 1sin sinY Y
X X
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Incline Tests
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Vestibular Prosthesis
Unfolded Box Folded Box
3D Model Designed by Monty Rivers
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Stress in Latches
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2-D Silicon Beam Test
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Width of Latch
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Conclusion and Future Work Either Rotational Algorithm would work
Need to test to see which one would be faster
Apply Rotational Axis Algorithm to Three axis system
Strength of VP
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Acknowledgements NSF UCI
Dr. Shkel and Ilya Chepurko Microsystems Lab
Monty Rivers Adam Schofield Alex Trusov
IM-SURE Said Shokair IM-SURE Fellows
SAP