Physics – Biological Physics
Scientific paper
2010-10-13
Physics
Biological Physics
16 pages, 8 figures. Paper is accepted for publication in Physical Review E
Scientific paper
Transparent biological tissues can be precisely dissected with ultrafast lasers using optical breakdown in the tight focal zone. Typically, tissues are cut by sequential application of pulses, each of which produces a single cavitation bubble. We investigate the hydrodynamic interactions between simultaneous cavitation bubbles originating from multiple laser foci. Simultaneous expansion and collapse of cavitation bubbles can enhance the cutting efficiency by increasing the resulting deformations in tissue, and the associated rupture zone. An analytical model of the flow induced by the bubbles is presented and experimentally verified. The threshold strain of the material rupture is measured in a model tissue. Using the computational model and the experimental value of the threshold strain one can compute the shape of the rupture zone in tissue resulting from application of multiple bubbles. With the threshold strain of 0.7 two simultaneous bubbles produce a continuous cut when applied at the distance 1.35 times greater than that required in sequential approach. Simultaneous focusing of the laser in multiple spots along the line of intended cut can extend this ratio to 1.7. Counter-propagating jets forming during collapse of two bubbles in materials with low viscosity can further extend the cutting zone - up to a factor of 1.54.
Palanker Daniel
Silbergleit Alexander
Simanovski Dmitri
Toytman Ilya
No associations
LandOfFree
Multi-focal laser surgery: cutting enhancement by hydrodynamic interactions between cavitation bubbles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multi-focal laser surgery: cutting enhancement by hydrodynamic interactions between cavitation bubbles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-focal laser surgery: cutting enhancement by hydrodynamic interactions between cavitation bubbles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-226091