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Effect of increasing flow when grooving during phacoemulsification.

Brian A Bird1, Rhett S Thomson1, Lance A Stutz1

  • 1From the University of Nevada Reno School of Medicine (Bird), Reno, Nevada, Department of Ophthalmology and Visual Sciences (Thomson, Heczko, Bernhisel, Barlow, Zaugg, Pettey, Olson), John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, and the University of Texas Southwestern Medical Center (Stutz), Dallas, Texas, USA.

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The optimal flow rate for the Centurion Vision System during cataract surgery grooving is 40 mL/min. Increasing flow beyond this point did not significantly improve efficiency, suggesting 40 mL/min offers the best balance of speed and safety.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Cataract surgery requires precise control of fluid dynamics.
  • The Centurion Vision System is a modern phacoemulsification device.
  • Optimizing flow settings can enhance surgical efficiency and safety.

Purpose of the Study:

  • To identify the most efficient flow rate for the Centurion Vision System during the lens grooving phase of cataract surgery.
  • To evaluate the impact of varying flow rates on surgical efficiency.

Main Methods:

  • An experimental setup simulated the anterior chamber using hardened porcine lenses.
  • Flow rates of 20, 40, and 60 mL/min were tested with standardized vacuum, power, and intraocular pressure settings.
  • Surgical efficiency was measured by the time required to groove the lens.

Main Results:

  • A flow rate of 40 mL/min resulted in a 17% increase in efficiency compared to 20 mL/min (P=0.05).
  • Increasing the flow rate to 60 mL/min did not yield statistically significant improvements in efficiency.
  • The 40 mL/min setting demonstrated the highest efficiency in the grooving step.

Conclusions:

  • The optimal flow rate for efficient lens grooving with the Centurion Vision System is 40 mL/min.
  • Higher flow rates beyond 40 mL/min do not offer significant additional efficiency benefits.
  • Flow rates below 40 mL/min may be nearly as efficient and potentially safer, warranting consideration in surgical practice.