Zobrazeno 1 - 10
of 14
pro vyhledávání: '"George J. Vassar"'
Autor:
T. Joshua Pfefer, Ashley J. Welch, Joel M.H. Teichman, George J. Vassar, Randolph D. Glickman, Kin F. Chan, Susan T. Weintraub
Publikováno v:
Journal of Endourology. 13:181-190
A series of experiments were conducted to test the hypothesis that the mechanism of holmium:YAG lithotripsy is photothermal.To show that holmium:YAG lithotripsy requires direct absorption of optical energy, stone loss was compared for 150 J Ho:YAG li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a430f910ee3e2e9600aaf07bb029a183
https://doi.org/10.1089/end.1999.13.181
https://doi.org/10.1089/end.1999.13.181
Autor:
JOEL M. H. TEICHMAN, GEORGE J. VASSAR, J. TERRY YATES, BRYAN N. ANGLE, ANTHONY J. JOHNSON, MONTE S. DIRKS, IAN M. THOMPSON
Publikováno v:
The Journal of Urology. :874-880
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d11171800f830052e0faf88d3fb93f7d
https://doi.org/10.1097/00005392-199903000-00037
https://doi.org/10.1097/00005392-199903000-00037
Autor:
T. Joshua Pfefer, George J. Vassar, Joel M.H. Teichman, Susan T. Weintraub, Kin F. Chan, Randolph D. Glickman, Ashley J. Welch
Publikováno v:
Lasers in Surgery and Medicine. 25:22-37
Background and Objective Evidence is presented that the fragmentation process of long-pulse Holmium:YAG (Ho:YAG) lithotripsy is governed by photothermal decomposition of the calculi rather than photomechanical or photoacoustical mechanisms as is wide
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03111f968b3a835722ef3c1ba6fd0596
https://doi.org/10.1002/(sici)1096-9101(1999)25:1<22::aid-lsm4>3.0.co
https://doi.org/10.1002/(sici)1096-9101(1999)25:1<22::aid-lsm4>3.0.co
Publikováno v:
Urology. 52:392-397
Objectives. To test the hypothesis that holmium:yttrium-aluminum-garnet (YAG) lithotripsy efficiency varies with stone composition. Methods. Single pulses of holmium:YAG energy were delivered using 272-, 365-, 550-, and 940-μm optical fibers to huma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f11fd170d4ab0e89c65f15b52d6d61d
https://doi.org/10.1016/s0090-4295(98)00239-8
https://doi.org/10.1016/s0090-4295(98)00239-8
Publikováno v:
The Journal of Urology. :471-476
We test the hypothesis that holmium:YAG lithotripsy efficiency varies with optical fiber size and energy settings (energy density).The 272, 365, 550 and 940 microm. optical fibers delivered 1 kJ. total holmium:YAG energy to calcium oxalate monohydrat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::280088713a5f00a711bd883722616374
https://doi.org/10.1097/00005392-199808000-00049
https://doi.org/10.1097/00005392-199808000-00049
Autor:
Randolph D. Glickman, George J. Vassar, Joel M.H. Teichman, Ian M. Thompson, Cara M. Beserra, Stephen J. Cina
Publikováno v:
Journal of Urology. 160:320-324
Purpose: Holmium:YAG lithotripsy fragments stones through a photothermal mechanism. Uric acid when heated is known to be converted into cyanide. We test the hypothesis that holmium:YAG lithotripsy of uric acid calculi produces cyanide.Materials and M
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d4ffa3ae4fb6a3ec42f936884bdd739
https://doi.org/10.1016/s0022-5347(01)62883-0
https://doi.org/10.1016/s0022-5347(01)62883-0
Publikováno v:
Journal of Urology. 159:17-23
The mechanism of lithotripsy differs among electrohydraulic lithotripsy, mechanical lithotripsy, pulsed dye lasers and holmium:YAG lithotripsy. It is postulated that fragment size from each of these lithotrites might also differ. This study tests the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73e505e2665f426b836ac1b3fe7c233f
https://doi.org/10.1016/s0022-5347(01)63998-3
https://doi.org/10.1016/s0022-5347(01)63998-3
Autor:
Kin F. Chan, George J. Vassar, Joel M. H. Teichman, Nicole S. Corbin, Randolph D. Glickman, Ashley J. Welch, Susan T. Weintraub
Publikováno v:
SPIE Proceedings.
Because of the >= 250 microsecond(s) pulsewidth emitted by the Ho:YAG laser used in clinical lithotripsy, it is unlikely that stress confinement occurs within the irradiated stones. Experimental data supports a thermal mechanism for Ho:YAG laser ston
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a387767cd811b06d0cdbc7a08653e78
https://doi.org/10.1117/12.364416
https://doi.org/10.1117/12.364416
Autor:
George J. Vassar, Randolph D. Glickman, T. Joshua Pfefer, Kin F. Chan, Susan T. Weintraub, Joel M. H. Teichman, Ashley J. Welch
Publikováno v:
SPIE Proceedings.
Because of the greater than or equal to 250 microsecond pulsewidth emitted by the Ho:YAG laser used in clinical lithotripsy, it is unlikely that stress confinement occurs within the irradiated stones. Experimental data supports a thermal mechanism fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dee93ea44e8472ef1bed1bb5683bcae7
https://doi.org/10.1117/12.350022
https://doi.org/10.1117/12.350022
Autor:
Joel M. H. Teichman, Susan T. Weintraub, T. Joshua Pfefer, George J. Vassar, Kin F. Chan, Randolph D. Glickman, Ashley J. Welch
Publikováno v:
SPIE Proceedings.
The Ho:YAG laser commonly used for clinical lithotripsy of urinary stones typically emits 250-microsecond pulses at a wavelength of 2.12 micrometer and repetition rates of up to 10 Hz. This pulse duration is longer than the time required for a pressu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7927dcf587707ce4ea4ba4fe9db505a7
https://doi.org/10.1117/12.350023
https://doi.org/10.1117/12.350023