Impact of pulse duration on Ho:YAG laser lithotripsy: treatment aspects on the single-pulse level.
World J Urol
; 33(4): 479-85, 2015 Apr.
Article
em En
| MEDLINE
| ID: mdl-25712309
ABSTRACT
OBJECTIVES:
Holmium-YAG (HoYAG) laser lithotripsy is a multi-pulse treatment modality with stochastic effects on the fragmentation. In vitro investigation on the single-pulse-induced effects on fiber, repulsion as well as fragmentation was performed to identify potential impacts of different HoYAG laser pulse durations. MATERIALS ANDMETHODS:
A HoYAG laser system (Swiss LaserClast, EMS S.A., Nyon, Switzerland) with selectable long- or short-pulse mode was tested with regard to fiber burn back, the repulsion capacity using an underwater pendulum setup and single-pulse-induced fragmentation capacity using artificial (BEGO) stones. The laser parameters were chosen in accordance with clinical application modes (laser fiber 365 and 200 µm; output power 4, 6 and 10 W in different combinations of energy per pulse and repetition rate). Evaluation parameters were reduction in fiber length, pendulum deviation and topology of the crater.RESULTS:
Using the long-pulse mode, the fiber burn back was nearly negligible, while in short-pulse mode, an increased burn back could be observed. The results of the pendulum test showed that the deviation induced by the momentum of short pulses was by factor 1.5-2 higher compared to longer pulses at identical energy per pulse settings. The ablation volumes induced by single pulses either in short-pulse or long-pulse mode did not differ significantly although different crater shapes appeared.CONCLUSION:
Reduced stone repulsion and reduced laser fiber burn back with longer laser pulses may result in a more convenient handling during clinical application and thus in an improved clinical outcome of laser lithotripsy.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Cálculos Urinários
/
Litotripsia a Laser
/
Lasers de Estado Sólido
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
World J Urol
Ano de publicação:
2015
Tipo de documento:
Article