Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Comparative Study
. 2012 Feb;38(2):333-42.
doi: 10.1016/j.jcrs.2011.07.041.

Stroke dynamics and frequency of 3 phacoemulsification machines

Daniele Tognetto  1 , Paolo Cecchini, Pia Leon, Marta Di Nicola, Giuseppe Ravalico
Affiliations
Comparative Study

Stroke dynamics and frequency of 3 phacoemulsification machines

Daniele Tognetto et al. J Cataract Refract Surg. 2012 Feb.

Abstract

Purpose: To measure the working frequency and the stroke dynamics of the phaco tip of 3 phacoemulsification machines.

Setting: University Eye Clinic of Trieste, Italy.

Design: Experimental study.

Methods: A video wet fixture was assembled to measure the working frequency using a micro camera and a micropulsed strobe-light system. A different video wet fixture was created to measure tip displacement as vectorial movement at different phaco powers using a microscopic video apparatus.

Results: The working frequency of the Infiniti Ozil machine was 43.0 kHz in longitudinal mode and 31.6 kHz in torsional mode. The frequency of the Whitestar Signature machine was 29.0 kHz in longitudinal mode and 38.0 kHz with the Ellips FX handpiece. The Stellaris machine had a frequency of 28.8 kHz. The longitudinal stroke of the 3 machines at different phaco powers was statistically significantly different. The Stellaris machine had the highest stroke extent (139 μm). The lateral movement of the Infiniti Ozil and Whitestar Signature machines differed significantly. No movement on the y-axis was observed for the Infiniti Ozil machine in torsional mode. The elliptical path of the Ellips FX handpiece had different x and y components at different phaco powers.

Conclusions: The 3 phaco machines performed differently in terms of working frequency and stroke dynamics. The knowledge of the peculiar lateral and elliptical path strokes of Infiniti and Whitestar Signature machines may allow the surgeon to fully use these features for lens removal.

PubMed Disclaimer

Publication types