Technical Briefs

A Scalable Model for Human Scala-Tympani Phantoms

[+] Author and Article Information
James R. Clark1

Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112james.r.clark@utah.edu

Frank M. Warren

Department of Otolaryngology, Division of Otology and Skull Base Surgery, Oregon Health and Science University, Portland, OR 97239warrenf@ohsu.edu

Jake J. Abbott

Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112jake.abbott@utah.edu


Corresponding author.

J. Med. Devices 5(1), 014501 (Jan 06, 2011) (5 pages) doi:10.1115/1.4002932 History: Received September 21, 2010; Revised October 23, 2010; Published January 06, 2011; Online January 06, 2011

In cochlear-implant (CI) insertion experiments, scala-tympani (ST) phantoms are often used in place of in vivo studies or cadaver studies. During the development of novel CI technology, a scaled-up phantom is often desirable. In this paper, we create a scalable model of the human ST by synthesizing published anatomical data and images. We utilize the model to fabricate an accurate, inexpensive, and reproducible ST phantom at a 3:1 scale.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

1:1 scale 3D ST spiral path, generated in MATLAB

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Figure 2

Cross sections showing ST channel profile outlines and tilt angles (dotted lines). The dashed vertical lines represent the cochlear central spiral axis. (a) Photograph of cochlea cross section (public domain image from Ref. 3), with ST profiles outlined. (b) Model cross section.

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Figure 3

ST channel profile example. (top) Profile showing width (w), height (h), and angle (ϕ) of the profile relative to the xy-plane. (bottom) Order in which profile points are plotted: 1 (Eq. 8), 2 (Eq. 9), and 3 (Eq. 10).

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Figure 4

ST spiral curve with profiles positioned along its length. The channel profile angle α is shown, defined relative to the positive x-axis direction.

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Figure 5

ST spiral curve with profiles centered, after spiral tightening to position the final profile closer to the curve apex

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Figure 6

ST spiral curve with profiles shifted to decrease the length of the ST inner and outer walls. Compare with original model of Fig. 4 and intermediate model of Fig. 5.

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Figure 7

Views of SolidWorks model construction. (left) Imported channel profiles with surrounding rectangular prism. (right) Channel formed by connecting the profiles with a lofted cut.

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Figure 8

Semicircular cut created at the ST channel apical end. (inset, dashed border) Sketch and rotation axis used to create the revolved cut. (inset, solid border) Semicircular end.

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Figure 9

Fabricated 3:1 scale ST phantom. The rectangular prism has dimensions 31×29×15 mm3.




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