lsr principle of operation
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Characterisation of the Elasticity of the Human Vocal Fold using Electromechanical Measurement Techniques. Characterisation of the Elasticity of the Human Vocal Fold using Electromechanical Measurement Techniques The Linear Skin Rheometer The Laryngeal Tensiometer. - PowerPoint PPT PresentationTRANSCRIPT
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Characterisation of the Elasticity of the Human Vocal Fold using
Electromechanical Measurement Techniques
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Characterisation of the Elasticity of the Human Vocal Fold using
Electromechanical Measurement Techniques
The Linear Skin Rheometer
The Laryngeal Tensiometer
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LSR Principle of Operation
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Shear Mode Operation
Force ~ Displacement Graph
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-2
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0 0.5 1 1.5 2 2.5
Indentor Mode
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Results from Harvard - AQL 2003
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Results from Wisconsin - 2005
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Typical Experimental Setup
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Vocal Fold Shear Modulus - Shear Model
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0 20 40 60 80 100
Age
Pa
sc
al
Female
Male
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Vocal Fold Shear Modulus - Indentometer Model
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0 20 40 60 80 100
Age
Pa
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female
Male
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Male FemaleShear 1008 190 1237 384Indent 1000 230 1332 214
Summary of Shear Modulus Results
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The Laryngeal Tensiometer
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•Show clips now
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Shear Strain
-0.4
-0.2
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0 50 100 150 200 250 300 350
Time
Fo
rce
gra
ms
Methyl Cellulose Attachment
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Suction Attachment
Suction
-1
-0.5
0
0.5
1
1.5
2
2.5
time
Gra
ms
Fo
rce
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Age Sex CofV Shear ModulusMean Pascals
36 F 15% 93337 F 19% 77728 F 11% 70170 F - 197228 F 10% 181952 F 27% 90163 M 22% 163755 M 17% 2225
Range of Shear Modulus Obtained from 8Volunteer Patients
First Suction results CofV = 3% & 8%
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Spinning
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Angle
DSR
Elastic Variance with angle
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Complete Vocal Fold
00.20.40.60.8
11.2
0 50 100 150 200
Angle (90 = transverse)
Stif
fnes
s
Anisotropic Behaviour Study
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Ligament & Muscle
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Muscle Only
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Complete 0.38
Ligament 0.53
Muscle 0.61
Ratio of Transverse to Longitudinal Stiffness
Implies LP is inherently anisotropic
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