Bent versus straight tips in micropulsed longitudinal phacoemulsification

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• 作者：Brian C. Stagg ; MD ; Isha Gupta ; BS ; Judd Cahoon ; BS ; Cecinio Ronquillo Jr. ; BS ; Dallas Shi ; BS ; Brian Zaugg ; MD ; Gareth Gardiner ; BS ; William R. Barlow Jr. ; MD ; Jeff H. Pettey ; MD ; M. Aabid Farukhi ; BS ; Jason Jensen ; BS ; Randall J. Olson ; MD ; ^{randallj.olson@hsc.utah.edu" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Canadian Journal of Ophthalmology / Journal Canadien d'Ophtalmologie
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：50
• 期：5
• 页码：354-359
• 全文大小：599 K

文摘

The aim of this study was to evaluate bent and straight phacoemulsification tips to determine which tip is more efficient in removal of lens fragments, using micropulsed longitudinal ultrasound in phacoemulsification.

Design

In vitro laboratory study.

Methods

The John A. Moran Eye Center Laboratories, University of Utah, Salt Lake City, Utah, was the study setting. Pig lenses hardened in a manner comparable with dense human cataracts were cut into 2-mm cubes and removed with micropulsed longitudinal ultrasound using settings previously shown to be optimally efficient (6 milliseconds on and 6 milliseconds off for a bent tip). To verify this time as most efficient for a straight tip, we also tested times of 5, 6, and 7 milliseconds time on and off. The tips were either straight or with a 20-degree bend. Twenty cubes were used for each comparative run.

Results

For the straight tip, 6 milliseconds on (1.56 ± 0.815 seconds) was significantly more efficient than 7 milliseconds on (2.45 ± 1.56 seconds, p = 0.001) and not significantly more efficient than 5 milliseconds on (1.69 ± 0.86 seconds, p = 0.43). Five milliseconds off time (1.45 ± 0.76s) was more efficient than 6 milliseconds (2.06 ± 1.37 seconds, p = 0.004) and 7 milliseconds off (2.18 ± 1.24s, p = 0.001). The straight tip was more efficient than the bent tip (1.38 ± 0.83 versus 2.93 ± 2.14 seconds, p = 0.006).

Conclusions

Results are contrary to accepted common belief. Micropulsed longitudinal phacoemulsification is more efficient with a straight rather than a bent tip.