Urinary calculus fragmentation during Ho: YAG and Er:YAG lithotripsy

Lee, Ho; Kang, Hyun Wook; Teichman, Joel M.H.; Oh, Junghwan; Welch, Ashley J.

doi:10.1002/lsm.20258

Cited by 51 publications

(18 citation statements)

References 43 publications

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“…In clinical applications, ablation in a liquid environment (e.g. water, blood, saline, or a mixture of them) (IALE) is often encountered when delivering laser radiation through optical fibers for medical applications inside the human body [6]; for example, in arthroscopic surgery [7], orthopedic procedures [8], dentistry [3], osteotomy [4], angioma treatment [9], and urology [10]. However, unlike the case for short-pulse laser ablation, the main mechanism contributing to the promoted ablation performance for long-pulse laser IALE requires further verification.…”

Section: Citationmentioning

confidence: 99%

Evaluation of ablation differences in air and water for hard tissues using full-field optical coherence microscopy

Xiao

et al. 2012

Chin. Sci. Bull.

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To clarify the role of a natural or artificial liquid environment in the free-running infrared pulsed laser ablation of hard biological tissues, two-and three-dimensional morphologies of laser-induced craters must be quantitatively measured to distinguish ablation differences in air and in water. Full-field optical coherence microscopy is introduced, which has non-contact, non-destructive, non-preprocessing and higher-resolution advantages. Experimental results indicate that the ablation performances in air and in water are comparable for few laser pulses, but the ablation difference becomes obvious for more laser pulses. Optical coherence microscopy is more feasible than conventional means for the morphological measurement of craters. ablation of hard tissue, optical coherence microscopy, holmium laser pulse Citation:Lü T, Xiao Q, Li Z J, et al. Evaluation of ablation differences in air and water for hard tissues using full-field optical coherence microscopy. Chin Sci Bull, 2012, 57: 833837,

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Section: Citationmentioning

confidence: 99%

Evaluation of ablation differences in air and water for hard tissues using full-field optical coherence microscopy

Xiao

et al. 2012

Chin. Sci. Bull.

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“…Experimental studies indicated that Er : YAG laser light (l ¼ 2.94 mm) is more strongly absorbed by urinary calculi than Ho : YAG light and disintegrates stones up to 5 times more efficiently. (5,6,8,9) However, currently available optical fibers do not transmit high energy Er : YAG pulses efficiently because of high absorption of Er : YAG wavelength by OH À group (10). Low-OH silica fibers are highly efficient in transmitting infrared light at wavelengths shorter than 1700 nm.…”

Section: Biophotonicsmentioning

confidence: 99%

Comparison of fluoride and sapphire optical fibers for Er: YAG laser lithotripsy

Qiu¹,

Teichman

Wang

et al. 2010

Journal of Biophotonics

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The long-pulse (200-350 micros) Holmium: YAG (Ho: YAG) laser (lambda = 2.12 microm) is used extensively in urology for laser lithotripsy. The long-pulse Erbium: YAG (Er: YAG) laser (lambda = 2.94 microm) fragments urinary calculi up to 5 times more efficiently than the Ho: YAG laser, however, no optical fibers are available to transmit efficiently 2.94 microm laser light for laser lithotripsy. We report results of a study evaluating a fluoride glass fiber to transmit Er: YAG laser light for laser lithotripsy and compare to a sapphire fiber that provides good transmission of Er: YAG light at low irradiance. The fluoride fiber provides superior light transmission efficiency over the sapphire fiber at an Er: YAG wavelength (2.94 microm). The sapphire fiber provides a more durable and robust delivery waveguide than the fluoride fiber when ablating urinary calculi in contact mode. Results of our study suggest that further development to improve performance of fluoride fibers for laser lithotripsy is warranted.

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“…Erbium:YAG lithotripsy fragments calculi by a photothermal mechanism [10]. Although this lithotripsy mechanism is similar to Holmium:YAG lithotripsy, Erbium:YAG is more efficient than Holmium:YAG lithotripsy [7][8][9]. Erbium:YAG wavelength is highly absorbed by water [11].…”

Section: Figmentioning

confidence: 99%

“…Due to its strong absorption by calculi of multiple compositions, the Erbium:YAG laser has been tested for the next generation lithotripter recently [7][8][9]. The Erbium:YAG laser operates at a wavelength of 2.94 μm and a pulse duration of 250-300 FIG.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Sapphire and Germanium Fibers for Erbium : Yag Lithotripsy

Lee¹,

Yoon²,

Jung³

et al. 2008

Journal of the Optical Society of Korea

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We studied the sapphire and germanium fibers to determine which optical fiber best transmits Erbium:YAG laser for intracorporeal lithotripsy. Human calculi were ablated with an Erbium:YAG laser in contact mode using two fibers. Optical outputs at the distal end of fibers were measured before and after laser lithotripsy. Upon the irradiation on the calculus with the 50 mJ and 100 mJ pulse energy, the output energy at the distal end of germanium fiber declined to approximately 50% of the input energy. For the sapphire fiber, the output energy at the distal end remained unchanged with 100 mJ input energy; however the output energy had dropped to 50% for 200 mJ input energy. In order to examine how the types of target tissue affect the fiber damage, the sapphire fiber was tested for the irradiation on soft tissue and water as well. No energy decline was observed during soft tissue and water irradiation. We also characterized ablation craters with both optical fibers. Both fibers produced similar craters on calculi in terms of depth and diameter. Sapphire fibers are better suited than germanium fibers for Erbium:YAG lithotripsy in terms of the fiber damage.

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Urinary calculus fragmentation during Ho: YAG and Er:YAG lithotripsy

Cited by 51 publications

References 43 publications

Evaluation of ablation differences in air and water for hard tissues using full-field optical coherence microscopy

Evaluation of ablation differences in air and water for hard tissues using full-field optical coherence microscopy

Comparison of fluoride and sapphire optical fibers for Er: YAG laser lithotripsy

Comparison of Sapphire and Germanium Fibers for Erbium : Yag Lithotripsy

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