When treating ureteral calculi, retropulsion can be reduced by using a longer pulse width
without compromising fragmentation efficiency (from the studies by David S. Finley et al. and
Hyun Wook Kang et al.). In this study, a lab build Ho:YAG laser was used as the laser pulse
source, with pulse energy from 0.2J up to 3.0 J, and electrical pump pulse width from 150 us up
to 1000 us. The fiber used in the investigation is a 365 μm core diameter fiber, SureFlexTM,
Model S-LLF365. Plaster of Paris calculus phantoms were ablated at different energy levels (0.2,
0.5, 1, 2, 3J) and with different number of pulses (1, 3, 10) using different electrical pump pulse
width (333, 667, 1000 μs). The dynamics of the recoil action of a calculus phantom was
monitored using a high-speed camera with frame rate up to 1 million frame per second
(Photron Fastcam SA5); and the laser-induced craters were evaluated with a 3-D digital
microscope (Keyence VHX-900F). A design of experiment software (DesignExpert-10,
Minneapolis, MN, USA) is used in this study for the best fit of surface response on volume of
dusting and retropulsion amplitude. The numerical formulas for the response surfaces of
dusting speed and retropulsion amplitude are generated. More detailed investigation on the
optimal conditions for dusting of other kinds of stone samples and the fiber size effect will be
conducted as a future study.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.