Lithotripter shock wave interaction with a bubble near various biomaterials

Area of Science:

• Fluid Dynamics
• Biophysics
• Acoustic Cavitation

Background:

• Previous research explored bubble dynamics near bio-materials and shock wave interactions.
• Understanding shock wave effects on bubbles near biological tissues is crucial for medical applications like lithotripsy.

Purpose of the Study:

• To investigate the interaction of shock waves with gas bubbles near various bio-materials.
• To simulate and analyze bubble collapse dynamics and potential bio-material strain under shock wave influence.
• To compare simulation results with experimental observations of cavitation bubble behavior.

Main Methods:

• Numerical simulations of gas bubble dynamics in water subjected to shock waves.
• Modeling interactions with different bio-materials (fat, skin, muscle, cornea, cartilage, bone).
• Comparison of simulation outcomes with experimental data from laser-induced cavitation bubbles.

Main Results:

• Bubble collapses are non-spherical, often forming high-speed jets.
• Simulations accurately replicate experimental observations of cavitation bubble collapse near elastic membranes.
• Rarefaction waves can cause bubble re-expansion and subsequent collapse, straining bio-materials.
• Bubble size significantly affects dynamics: large bubbles split, small bubbles jet.
• Shock wave reflection at hard bio-material interfaces (e.g., bone) influences bubble behavior.

Conclusions:

• The numerical model provides an efficient method for studying shock wave-bubble-bio-material interactions.
• Findings offer insights into the mechanisms of bio-material damage during shock wave lithotripsy.
• Bubble dynamics are highly sensitive to shock wave characteristics, bubble size, and surrounding bio-material properties.