Abstract
Purpose
To investigate the fragmentation capacity, clearance time, and drilling speed of combined ultrasonic with impact dual-energy and single energy ultrasonic lithotripter devices.
Methods
Stone fragmentation and clearance tests were performed under direct view in an underwater layered hemisphere by four different operators using artificial stones (n = 10/operator). Time for complete clearance was measured. Drilling tests were performed using an underwater setup, consisting of a mounting rack for fixing the lithotripter handpiece with the probe in vertical position and in contact with the stone phantom placed on one side of a balance for defined and constant contact application pressure equivalent to 450 g load. Time until complete perforation or in case of no perforation, the penetration depth after 60 s into the stone sample was recorded. Four devices, one single energy device (SED), one dual-energy dual probe (DEDP), two dual-energy single probe (DESP-1, DESP-2), with different parameters were tested.
Results
Stone fragmentation and clearance speed were significantly faster for dual-energy device DESP-1 compared to all other devices (p < 0.001). Using DESP-1, the clearance time needed was 26.0 ± 5.0 s followed by DESP-2, SED and DEDP requiring 38.4 ± 5.8 s, 40.1 ± 6.3 s and 46.3 ± 11.6 s, respectively. Regarding the drilling speed, DESP-1 was faster compared to all other devices used (p < 0.05). While the drilling speed of DESP-1 was 0.69 ± 0.19 mm/s, compared to 0.49 ± 0.18 mm/s of DESP-2, 0.47 ± 0.09 mm/s of DEDP, and 0.19 ± 0.03 mm/s of SED.
Conclusions
The dual-energy/single-probe device combining ultrasonic vibrations with electromechanical impact was significantly faster in fragmentation and clearing stone phantoms as well as in drilling speed compared to all other devices.
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Acknowledgements
The authors wish to thank Mr. Wolfgang Merkle for his scientific support for this study.
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MJB: protocol/project development, data collection and management, data analysis, manuscript writing, ME: protocol/project development, data collection, manuscript writing, FS: protocol/project development, manuscript editing, UN: protocol/project development, manuscript editing, CGS: protocol/project development, manuscript editing, TP: protocol/project development, data analysis, RS: protocol/project development, data analysis, manuscript editing.
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Bader, M.J., Eisel, M., Strittmatter, F. et al. Comparison of stone elimination capacity and drilling speed of endoscopic clearance lithotripsy devices. World J Urol 39, 563–569 (2021). https://doi.org/10.1007/s00345-020-03184-1
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DOI: https://doi.org/10.1007/s00345-020-03184-1