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Ultrasonography

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...

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A multi-physics model for ultrasonically activated soft tissue.

Rahul Suvranu De¹

¹Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180 USA.

Computer Methods in Applied Mechanics and Engineering

|January 17, 2017

Summary

This summary is machine-generated.

A new multi-physics model simulates ultrasonic soft tissue activation, revealing how cellular cavitation and water evaporation impact temperature and pressure. This helps predict tissue damage during ultrasonic surgery.

Keywords:

cavitational effect equation-of-state multi-physics modeling ultrasonically activated scalpel (UAS)ultrasonically activated soft tissue

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Area of Science:

Biophysics
Mechanical Engineering
Materials Science

Background:

Ultrasonic surgical instruments rely on precise control of tissue mechanics and thermodynamics.
Understanding cellular-level responses is crucial for predicting tissue behavior under ultrasonic loads.

Purpose of the Study:

To develop a multi-physics model integrating cellular cavitation effects into a continuum model for soft tissue.
To investigate the thermomechanical response of soft tissue during ultrasonic activation.

Main Methods:

Developed a multi-physics continuum model incorporating cellular cavitation.
Assumed a viscoelastic material model for soft tissue macromechanics.
Utilized a cavitation model-based equation-of-state to link water evaporation to thermodynamic states.

Main Results:

The model accurately captures deformation and temperature evolution in ultrasonically activated soft tissue.
Cellular water evaporation below boiling temperature indicates protein denaturation.
Increased operating frequency or load accelerates temperature rise and water evaporation, potentially speeding up tissue coagulation.

Conclusions:

Cellular cavitation and water evaporation are key mechanisms influencing soft tissue thermomechanics.
The model provides insights into tissue damage thresholds during ultrasonic procedures.
Findings are relevant for optimizing ultrasonic surgical instrument design and application.