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TECHNICAL PAPERS: Other

Dependence of Calculus Retropulsion Dynamics on Fiber Size and Radiant Exposure During Ho:YAG Lithotripsy

[+] Author and Article Information
Ho Lee

Dept. of Mechanical Engineering, The University of Texas at Austin, Texas Longhorns, Austin, TX 78712, Phone: (512) 471-9497, Fax: (512) 232-4919 Wellman Laboratories of Photomedicine Massachusetts General Hospital, BHX 630 Harvard Medical School, 50 Blossom Street, Boston, MA, 02114, Phone: (617) 724-2067, Fax: (617) 724-2075

Robert T. Ryan, Joel M. H. Teichman

Divisions of Urology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229, Phone: (210) 567-5640, Fax: (210) 567-6868

Jeehyun Kim, A. J. Welch

Dept. of Biomedical Engineering, The University of Texas at Austin, Texas Longhorns, Austin, TX 78712, Phone: (512) 471-9497, Fax: (512) 232-4919

Bernard Choi

Bechman Laser Institute and Medical Clinic, University of California, 1002 Health Sciences Road East, Irvine, CA 92612, Phone: (949) 824-3754, Fax: (949) 824-6969

Navanit V. Arakeri

(see below)Dept. of Biomedical Engineering, The University of Texas at Austin, Texas Longhorns, Austin, TX 78712, Phone: (512) 471-9497, Fax: (512) 232-4919

J Biomech Eng 126(4), 506-515 (Sep 27, 2004) (10 pages) doi:10.1115/1.1786297 History: Received February 07, 2004; Online September 27, 2004
Copyright © 2004 by ASME
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References

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Figures

Grahic Jump Location
Experimental setup used to measure the initial velocity of the calculus phantom after the laser pulse
Grahic Jump Location
Calculus phantom recoil after laser pulse (Fiber diameter=940 μm, incident laser energy=1 J and H0=144 J/cm2). (a) before laser pulse, (b) 4 msec, (c) 8 msec, and (d) 60 msec after the onset of the pulse.
Grahic Jump Location
Recoil momentum of 150 mg calculus phantoms as a function of Ho:YAG laser radiant exposure for different fiber diameters. Measurements were made in air.
Grahic Jump Location
Recoil momentum of 150 mg calculus phantoms as a function of Ho:YAG laser radiant exposure for different fiber diameters. Measurements were made in water.
Grahic Jump Location
Rocking of phantom in water after pulse (Fiber diameter=550 μm, input laser energy=600 mJ, and H0=252 J/cm2).
Grahic Jump Location
Laser-induced bubble and re-entrance flow (Fiber diameter=550 μm, input laser energy=600 mJ, and H0=252 J/cm2).
Grahic Jump Location
Cross-sectional topography of Ho:YAG laser-induced craters acquired with OCT.
Grahic Jump Location
Ablation volumes as a function of laser radiant exposure and fiber diameter. Measurements were made in air.
Grahic Jump Location
Direction of plume propagation with different incident angles (Fiber diameter=940 μm, input laser energy=500 mJ and H0=72.5 J/cm2).
Grahic Jump Location
Schematic representation of material ablation driven by a continuous ablation process.
Grahic Jump Location
Ratios between irradiation areas and ratios between the slopes of curve-fit lines of recoil momentum data.
Grahic Jump Location
Ejection of ablated particles from four distinct craters. Velocity vectors are resolved into X and Y components.
Grahic Jump Location
Asymmetric bubble collapse near a solid boundary. Numbers indicate time sequence of the bubble collapse which is on the order of 100 μsec.
Grahic Jump Location
Proposed mechanism of calculus rocking.

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