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RESEARCH PAPERS

Device for Measurement of Human Tissue Properties In Vivo

[+] Author and Article Information
Robert L. Williams1

Interdisciplinary Institute for Neuromusculoskeletal Research,  Ohio University, Athens, OH 45701-2979williar4@ohio.edu

Wei Ji, John N. Howell, Robert R. Conatser

Interdisciplinary Institute for Neuromusculoskeletal Research,  Ohio University, Athens, OH 45701-2979

www.nlm.nih.gov∕research∕visible∕visible̱human.html

www.medicalsim.org

www.enduratec.com

www.neurogenic.com

www.sensable.com

1

Corresponding author.

J. Med. Devices 1(3), 197-205 (Aug 06, 2007) (9 pages) doi:10.1115/1.2778703 History: Received November 21, 2006; Revised August 06, 2007

We present a method for measurement of human tissue compliance in vivo using a commercial haptic interface to apply known step changes in force while recording the resulting displacements. We introduce our system, the soft-tissue compliance meter. Our motivation was to improve the compliance realism of our virtual haptic back model, but there are many potential applications for this method. We present calibration of the haptic interface, pseudostatic compliance measurement techniques, measurement of contracted muscle compliances, and several important issues affecting our results.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Left PHANTOM experimental compliance

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Figure 2

Back compliance measurement method

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Figure 3

Data for cervical-region compliance measurement

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Figure 4

L3 compliance results

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Figure 5

T10 compliance results

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Figure 6

Improved compliance curves, L3 4cmL

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Figure 7

Compliances from Fig. 6

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Figure 8

In vivo back compliance results: (a) best-fit surface and (b) associated compliance color map

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Figure 9

Measurement points plus EMG leads

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Figure 10

Lumbar compliance plots, 100mV contraction

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Figure 11

Compliance with contraction, cervical region

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Figure 12

Reproducibility results

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Figure 13

Seated back measurements

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Figure 14

Prone∕seated compliance results

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Figure 15

Thoracic volume compliance results

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Figure 16

Different force time intervals

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Figure 17

Compliance lines for Fig. 1

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Figure 18

Effect of force step time interval on compliance

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Figure 19

Compliances versus waiting time intervals

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