A Novel Elastometer For Soft Tissue
Author(s)
S. M. Harrison, M. B. Bush & P. Petros
Abstract
A novel device has been designed to allow a surgeon to determine the medium
strain (5-25%) compressive properties of highly extensible soft tissue during a
surgical procedure. The motivation for the instrument is the need for accurate
knowledge of the elastic properties of vaginal tissue in vivo during corrective
surgery for incontinence in women. Studies have shown that a surgical technique
that adjusts the elastic nature of vaginal tissue can reduce urge and stress
incontinence symptoms. The success of the surgical technique would be greatly
enhanced by the introduction of an objective measure of the stiffness of vaginal
tissue.
The compressive deformation is achieved by folding and pinching (indenting)
the tissue between two circular cylinders. The applied load and indentation depth
are used to estimate the elastic properties of the sampled tissue. A linear material
model has been developed and tested against commercially available elastomers.
The limits of application of the linear material model were determined using
FEA and results from the experimental testing. A basic nonlinear model is also
presented that can determine the Neo-Hookean constant of the material. The
simple algorithms developed allow immediate inversion of measurements to give
elastic properties, thereby permitting multiple readings to be made during a
surgical procedure, an outcome that would not be possible if FEA or similar
numerical methods were needed for interpretation of the readings. Experimental
and numerical results are compared to the analytical models and a discussion of
initial design ideas is presented. The device is shown to yield elastic modulus of
test materials with an error of less than 10%.
Keywords: soft tissue elastometer, large strain, FEA, in-vivo.
1 Introduction
The knowledge of a measure of the elastic nature of particular human tissue
structures has significant value to many areas of medicine. In particular some
Keywords
soft tissue elastometer, large strain, FEA, in-vivo.
Related Book
Other papers in this volume
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