Transcript
ALIGNMENT ALGORITHM FOR THE VESTIBULAR
PROSTHESIS
By:Brian HensleyMentors:Dr. A. ShkelIlya Chepurko
Graduate Student Team:Monty RiversAdam SchofieldAlexander Trusov
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
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
Project Overview Areas which I
am involved: Rotational
axes algorithm 3D Modeling
http://anorganik.uni-tuebingen.de/klaus/nmr/conventions/euler/euler.html
Goal
http://www.stewart.cs.sdsu.edu/cs596-3dprog/lecs/index.html
The Vestibular Organs
http://www.neuroanatomy.wisc.edu/virtualbrain/BrainStem/13VNAN.html
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
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
Graph of Model
Graphic by Ilya Chepurko
Rotational Algorithm-Scalar Projection
http://www.nixfiles.com/critters/proposal-slides.html
Tests Electrical
Simulation Single Gyroscope
on rate table Flat Inclined
Electrical Simulation Wanted to see if the microchip
accurately responded to input voltage by producing graph of transfer function
Results of Electrical Simulation
Graphic by Ilya Chepurko
Rate Table Test of a Single Gyro The Flat Tests
Results of Rotation without Incline
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
Incline Tests
Vestibular Prosthesis
Unfolded Box Folded Box
3D Model Designed by Monty Rivers
Stress in Latches
2-D Silicon Beam Test
Width of Latch
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
Acknowledgements NSF UCI
Dr. Shkel and Ilya Chepurko Microsystems Lab
Monty Rivers Adam Schofield Alex Trusov
IM-SURE Said Shokair IM-SURE Fellows
SAP
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