Pulse modulation with Moses technology improves popcorn laser lithotripsy
| Autor: | Joel M.H. Teichman, Ali H Aldoukhi, Sami E Majdalany, William W. Roberts, Timothy L. Hall, Khurshid R. Ghani, Kristian M Black |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
business.industry
Urology Bubble medicine.medical_treatment 030232 urology & nephrology chemistry.chemical_element Lithotripsy Laser Laser lithotripsy Plume law.invention Fragment size 03 medical and health sciences 0302 clinical medicine chemistry law 030220 oncology & carcinogenesis Medicine Atomic physics business Holmium Pulse-width modulation |
| Zdroj: | World Journal of Urology. 39:1699-1705 |
| ISSN: | 1433-8726 0724-4983 |
| Popis: | Moses™ technology has been developed to improve holmium laser fragmentation at 1–2 mm distance from the stone. Because popcorn lithotripsy is a non-contact technique, we compared short pulse (SP) and Moses distance (MD) modes in an in vitro model. BegoStones were fragmented using a 120 W Ho:YAG laser (P120 Moses) and a 230 μm core fiber introduced through a ureteroscope. 20 W (1 J × 20 Hz; 0.5 J × 40 Hz) and 40 W (1 J × 40 Hz; 0.5 J × 80 Hz) settings (total energy 4.8 kJ) were tested using SP and MD modes. We assessed fragment size distribution and mass lost in fluid (initial mass–final dry mass of all sievable fragments). High-speed video analysis of fragmentation strike rate and vapor bubble characteristics was conducted for 1 J × 20 Hz and 0.5 J × 80 Hz. Laser strike rate (number of strikes divided by frequency) was categorized as: (1) direct—a visual plume of dust ejected from stone while in contact with fiber tip; (2) indirect—a visual plume of dust ejected with distance between stone and fiber tip. For 1 J × 20 Hz (20 W), MD resulted in more mass lost in fluid and a lower distribution of fragments ≥ 2 mm compared to SP (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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