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Related Experiment Videos

Phacodynamics: an aspiration flow vs vacuum comparison.

Wesley Adams1, Jason Brinton, Michael Floyd

  • 1Department of Ophthalmology and Visual Sciences, University of Utah Health Sciences Center, Salt Lake City, Utah 84132, USA.

American Journal of Ophthalmology
|August 1, 2006
PubMed
Summary

The Alcon Legacy phacoemulsification machine demonstrated superior flow compared to the Advanced Medical Optics Sovereign. Legacy also achieved higher unoccluded vacuum, crucial for efficient cataract surgery.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Phacoemulsification machines are critical for cataract surgery.
  • Comparing fluidics performance of different surgical devices is essential for optimizing surgical outcomes.

Purpose of the Study:

  • To compare the actual fluid flow and vacuum levels generated by the Advanced Medical Optics Sovereign and Alcon Legacy phacoemulsification systems.
  • To evaluate the performance differences between 19-gauge and 20-gauge phacoemulsification tips.

Main Methods:

  • An in vitro laboratory study was conducted.
  • Fluid flow and machine-indicated vacuum were measured across a range of settings (12-40 ml/min).
  • Actual tip vacuum was calculated from machine readings for both 19-gauge and 20-gauge tips.

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Main Results:

  • The Alcon Legacy system exhibited significantly higher actual flow (102.4%) compared to the Advanced Medical Optics Sovereign (96.5%).
  • Lower flow rates were observed with 20-gauge tips compared to 19-gauge tips.
  • The Sovereign system generated less unoccluded vacuum (70.3 mm Hg) than the Legacy system (89.4 mm Hg) at 36 ml/min.

Conclusions:

  • Significant differences in fluid dynamics exist between the Alcon Legacy and Advanced Medical Optics Sovereign phacoemulsification machines.
  • The Alcon Legacy system provides higher vacuum levels, potentially leading to more efficient cataract removal.
  • Phacoemulsification tip gauge impacts both flow and vacuum performance.