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Bent versus straight tips in micropulsed longitudinal phacoemulsification.

Brian C Stagg1, Isha Gupta1, Judd Cahoon1

  • 1Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah.

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|October 13, 2015
PubMed
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A study found that straight phacoemulsification tips are more efficient than bent tips for removing lens fragments during cataract surgery. This challenges common surgical beliefs regarding ultrasound efficiency.

Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Phacoemulsification is a key surgical technique for cataract removal.
  • The efficiency of phacoemulsification is influenced by the design of the ultrasound tip.
  • Bent tips are commonly believed to offer advantages in certain surgical scenarios.

Purpose of the Study:

  • To compare the efficiency of bent versus straight phacoemulsification tips.
  • To evaluate fragment removal using micropulsed longitudinal ultrasound.
  • To determine optimal ultrasound settings for different tip configurations.

Main Methods:

  • An in vitro laboratory study using hardened pig lenses.
  • Micropulsed longitudinal ultrasound was applied to 2-mm lens cubes.

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  • Comparative analysis of fragment removal times for straight and 20-degree bent tips.

    • Main Results:

    • The straight phacoemulsification tip demonstrated significantly higher efficiency (1.38 ± 0.83 seconds) compared to the bent tip (2.93 ± 2.14 seconds, p = 0.006).
    • Optimal ultrasound settings for the straight tip were identified as 6 milliseconds on/off and 5 milliseconds off.
    • Results indicate a statistically significant difference in efficiency between the two tip types.

    Conclusions:

    • Contrary to prevailing surgical assumptions, straight phacoemulsification tips are more efficient.
    • Micropulsed longitudinal ultrasound performs better with straight tips for lens fragment removal.
    • This finding has implications for optimizing phacoemulsification techniques and equipment selection.