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Strain and Elastic Modulus

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...

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Updated: Feb 25, 2026

A Probing Device for Quantitatively Measuring the Mechanical Properties of Soft Tissues during Arthroscopy

A Probing Device for Quantitatively Measuring the Mechanical Properties of Soft Tissues during Arthroscopy

Published on: May 1, 2020

Video-tactile pneumatic sensor for soft tissue elastic modulus estimation.

M M Gubenko¹, A V Morozov¹, A N Lyubicheva¹

¹A. Ishlinsky Institute for Problems in Mechanics RAS, Moscow, Russia.

Biomedical Engineering Online

|August 3, 2017

Summary

A novel pneumatic sensor accurately estimates soft tissue elasticity, crucial for minimally invasive surgery. This new sensor achieves high reliability with less than 5% error, aiding in diagnosing pathological tissues.

Keywords:

Indentation Laparoscopy Minimally invasive surgery Tactile sensor Young’s modulus

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Last Updated: Feb 25, 2026

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Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography

Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography

Published on: May 10, 2022

Area of Science:

Biomedical Engineering
Surgical Technology
Materials Science

Background:

Development of a novel sensor for estimating soft tissue elasticity.
Application focus on minimally invasive surgery, specifically for liver tissue assessment.

Purpose of the Study:

To introduce and validate a new sensor for non-invasive elasticity estimation of soft tissues.
To assess the sensor's reliability and accuracy across a range of tissue stiffness.

Main Methods:

Utilizes a pneumatic sensor head with adjustable internal pressure to measure tissue deformation.
Incorporates an internal video camera to determine the contact area radius.
Employs finite element model simulations combined with measured data to calculate elastic modulus.

Main Results:

Successfully tested on three phantom materials (plastic, silicone, gelatin) with varying stiffness.
Demonstrated high reliability with experimental errors consistently below 5%.
The sensor effectively estimates the elastic modulus of indented soft tissues.

Conclusions:

The developed sensor provides accurate and reliable elasticity measurements for soft tissues.
Potential application as an instrument in laparoscopic surgery for diagnosing pathological tissues or internal organs.
The sensor's ability to handle a wide range of stiffness makes it versatile for surgical applications.