Related Experiment Video
Updated: Apr 17, 2026
05:05
Ultrasound Cyclo Plasty in Eyes with Glaucoma
Published on: January 26, 2018
12.8K
Determining optimal ultrasound off time with micropulse longitudinal phacoemulsification
Jason D Jensen1, Kevin R Kirk1, Isha Gupta1
1From the Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.
Journal of Cataract and Refractive Surgery
|February 10, 2015
Summary
Optimizing micropulse ultrasound (US) settings for efficient lens fragment removal is crucial. An off-time of 6 milliseconds (ms) is recommended to maximize phacoemulsification efficiency during cataract surgery.
Area of Science:
- Ophthalmology
- Surgical Technology
- Biomedical Engineering
Background:
- Cataract surgery involves fragmenting the lens for removal.
- Micropulse ultrasound (US) is a technology used in phacoemulsification.
- Optimizing US parameters can enhance surgical efficiency.
Purpose of the Study:
- To determine the optimal off-time setting for micropulse ultrasound (US) to achieve the most efficient lens fragment removal.
- To evaluate the impact of varying off-times on phacoemulsification efficiency and chatter.
Main Methods:
- Experimental study using porcine lens nuclei.
- Micropulse ultrasound (US) with a bent 0.9 mm phaco tip was employed.
- Off-time was systematically varied from 2 to 20 ms while maintaining a constant on-time of 7 ms.
Main Results:
- Phacoemulsification efficiency showed a nonsignificant increase with off-times from 2 to 6 ms.
- A significant decrease in efficiency was observed with off-times ranging from 6 to 20 ms.
- Chatter remained minimal and statistically consistent across all tested off-times.
Conclusions:
- An off-time of 6 to 7 ms provides efficiency comparable to shorter settings.
- Longer off-times (8-20 ms) result in reduced phacoemulsification efficiency.
- A 6 ms off-time setting is recommended to maximize efficiency in micropulse longitudinal US procedures.
