Alignment Algorithm for the Vestibular Prosthesis

1
Alignment Algorithm for the Vestibular Prosthesis

• Graduate Student Team
• Monty Rivers
• Adam Schofield
• Alexander Trusov

• By
• Brian Hensley
• Mentors
• Dr. A. Shkel
• Ilya Chepurko

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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.ht
ml
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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
4
Project Overview

• Areas which I am involved
• Rotational axes algorithm
• 3D Modeling

http//anorganik.uni-tuebingen.de/klaus/nmr/conven
tions/euler/euler.html
5
Goal
http//www.stewart.cs.sdsu.edu/cs596-3dprog/lecs/i
ndex.html
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The Vestibular Organs
http//www.neuroanatomy.wisc.edu/virtualbrain/Brai
nStem/13VNAN.html
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How the Signal Travels

• Natural System

• Vestibular Prosthesis

Gyroscope
Rotational Axis Algorithm
Transfer Function
http//anatomy.iupui.edu/courses/histo_D502/D502f0
4/lecture.f04/Earf04/Ear.f04.html
http//www.psconsulting.net.au/ttraining.html
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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

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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.h
tml
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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

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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