Purpose: To study a prototype of an ultrasound-based vitrector, and to try to understand the physical phenomena underlying this new technology. Methods: We tested the ultrasound-based vitrector prototype (UV) (ultrasonically-driven handpiece obtained from a modified version of the Alcon CONSTELLATION Vision System [Alcon]) using an automatic experimental setup. Balanced saline solution (BSS) and vitreous (from fresh postmortem enucleated porcine eyes) flow rates were analyzed using three different tips. Results: In general, BSS solution flow rates increased with increasing aspiration levels and decreased when we used % US power. Vitreous flow rates were influenced by aspiration levels, % US power, and ultrasound-related phenomena: Cavitation phenomenon and "jet streaming." Conclusion: Ultrasound-based vitrectomy may represent an important alternative to traditional vitrectomy. Such a tool, capable of liquefying and excising the vitreous body using ultrasound, could overcome all the limits of the guillotine-based technique (GV). Knowledge of the physical phenomena underlying ultrasound-based technology is a necessary prerequisite for further development of this new technology.
Rizzo, S., Fantoni, G., Mucciolo, D. P., Giorni, A., Volpi, L., Pierallini, M., Mazzoni, A., Faraldi, F., Ultrasound in vitrectomy: An alternative approach to traditional vitrectomy techniques, <<RETINA>>, 2020; 40 (1): 24-32. [doi:10.1097/IAE.0000000000002354] [https://hdl.handle.net/10807/248285]
Ultrasound in vitrectomy: An alternative approach to traditional vitrectomy techniques
Rizzo, Stanislao;Volpi, Laura;Mazzoni, Alberto;
2020
Abstract
Purpose: To study a prototype of an ultrasound-based vitrector, and to try to understand the physical phenomena underlying this new technology. Methods: We tested the ultrasound-based vitrector prototype (UV) (ultrasonically-driven handpiece obtained from a modified version of the Alcon CONSTELLATION Vision System [Alcon]) using an automatic experimental setup. Balanced saline solution (BSS) and vitreous (from fresh postmortem enucleated porcine eyes) flow rates were analyzed using three different tips. Results: In general, BSS solution flow rates increased with increasing aspiration levels and decreased when we used % US power. Vitreous flow rates were influenced by aspiration levels, % US power, and ultrasound-related phenomena: Cavitation phenomenon and "jet streaming." Conclusion: Ultrasound-based vitrectomy may represent an important alternative to traditional vitrectomy. Such a tool, capable of liquefying and excising the vitreous body using ultrasound, could overcome all the limits of the guillotine-based technique (GV). Knowledge of the physical phenomena underlying ultrasound-based technology is a necessary prerequisite for further development of this new technology.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.