Vapor bubble formation during erbium:YAG laser vitrectomy

Michael Mrochen; Christof Donitzky; Peter Riedel; Micaela Wenig; Max Reindl; Theo Seiler

doi:10.1117/12.350578

18 June 1999 Vapor bubble formation during erbium:YAG laser vitrectomy

Michael Mrochen, Christof Donitzky, Peter Riedel, Micaela Wenig, Max Reindl, Theo Seiler

Proceedings Volume 3591, Ophthalmic Technologies IX; (1999) https://doi.org/10.1117/12.350578
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Background: The formation of evaporation bubbles and pressure waves during Erbium:YAG laser vitrectomy might cause intraocular damages. Methods: In water, the formation of the evaporation bubbles was observed by high-speed photography. The output energy of the quartz tip ranges from 5 to 50 mJ and the laser pulse duration from 50 μsec to 300 μsec. The dynamic of the evaporation bubbles were investigated for different diameters, various angles and radii of the quartz fiber tip. Furthermore, the spread out of the evaporation bubbles was observed for various geometries of the microsurgery probe. The induced stress waves were measured with a PVDF-hydrophone. Results: The evaporation bubble size increases semi-logarithmic with the pulse energy and reduces with the increase of the pulse duration. The diameter of the tip has no significant influence in the vapor bubble size. The expansion of the vapor bubble can be controlled by the geometry of the tip. The spread out of the vapor bubble can reduced by a slit geometry of the aspiration hole. The maximum pressure amplitude as found to be < 2 MPa. Conclusions: The evolution of evaporation bubbles and the induced pressure amplitudes from the microsurgery probe can be minimized for Erbium:YAG laser vitrectomy.

Citation Download Citation

Michael Mrochen, Christof Donitzky, Peter Riedel, Micaela Wenig, Max Reindl, and Theo Seiler "Vapor bubble formation during erbium:YAG laser vitrectomy", Proc. SPIE 3591, Ophthalmic Technologies IX, (18 June 1999); https://doi.org/10.1117/12.350578

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