Dependence of Calculus Retropulsion Dynamics on Fiber Size and Radiant Exposure During Ho:YAG Lithotripsy-Reference-Cited by-同舟云学术

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

Published:2004-08-01 Issue:4 Volume:126 Page:506-515
ISSN:0148-0731
Container-title:Journal of Biomechanical Engineering
language:en
Short-container-title:

Author:

Lee Ho¹²,Ryan Robert T.³,Kim Jeehyun⁴,Choi Bernard⁵,Arakeri Navanit V.⁶⁴,Teichman Joel M. H.³,Welch A. J.⁴

Affiliation:

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

2. 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

3. 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

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

5. 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

6. (see below)

Abstract

During pulsed laser lithotripsy, the calculus is subject to a strong recoil momentum which moves the calculus away from laser delivery and prolongs the operation. This study was designed to quantify the recoil momentum during Ho:YAG laser lithotripsy. The correlation among crater shape, debris trajectory, laser-induced bubble and recoil momentum was investigated. Calculus phantoms made from plaster of Paris were ablated with free running Ho:YAG lasers. The dynamics of recoil action of a calculus phantom was monitored by a high-speed video camera and the laser ablation craters were examined with Optical Coherent Tomography (OCT). Higher radiant exposure resulted in larger ablation volume (mass) which increased the recoil momentum. Smaller fibers produced narrow craters with a steep contoured geometry and decreased recoil momentum compared to larger fibers. In the presence of water, recoil motion of the phantom deviated from that of phantom in air. Under certain conditions, we observed the phantom rocking towards the fiber after the laser pulse. The shape of the crater is one of the major contributing factors to the diminished recoil momentum of smaller fibers. The re-entrance flow of water induced by the bubble collapse is considered to be the cause of the rocking of the phantom.

Publisher

ASME International

Subject

Physiology (medical),Biomedical Engineering

Link

http://asmedigitalcollection.asme.org/biomechanical/article-pdf/126/4/506/5503328/506_1.pdf

Reference32 articles.

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