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Thermal evaluation of two phacoemulsification systems.

Bradley S Henriksen1, Gareth Gardiner1, Kevin Garff1

  • 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
|February 14, 2016
PubMed
Summary
This summary is machine-generated.

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New transversal ultrasound (Ellips FX) generated more heat than micropulse and torsional ultrasound. Caution is advised with torsional ultrasound, especially in cadaver models, due to higher heat accumulation.

Area of Science:

  • Ophthalmology
  • Surgical Technology

Background:

  • Phacoemulsification uses ultrasound energy to remove cataracts.
  • Different ultrasound modalities (transversal, torsional, micropulse) have varying thermal profiles.
  • Understanding heat generation is crucial for preventing intraoperative complications like incisional burns.

Purpose of the Study:

  • To compare the thermal profiles of new transversal ultrasound power modulation (Ellips FX) against torsional ultrasound (OZil) and micropulse settings (Signature).
  • To evaluate heat accumulation in both an artificial chamber and a cadaver eye model.

Main Methods:

  • Laboratory investigation measuring temperature increase after 30 seconds.
  • Tested Ellips FX (transverse) and Signature (micropulse) at 100% power, and OZil (torsional) at 100% power.

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  • Temperature was measured using a microthermistor probe on the phacoemulsification sleeve with aspiration blocked.

    • Main Results:

    • Transversal FX demonstrated significantly greater temperature increase than both micropulse and torsional ultrasound (p < 0.001).
    • Micropulse settings also showed a greater temperature increase compared to torsional ultrasound (p < 0.001).
    • The cadaver eye model exhibited higher temperature increases than the artificial chamber for torsional ultrasound (p < 0.001).

    Conclusions:

    • Higher heat accumulation in the cadaver model suggests a potential risk for incisional burns, particularly with 100% torsional ultrasound and blocked aspiration.
    • The new transversal FX model generates more heat than previously reported, necessitating further investigation into its incisional burn risk.
    • While micropulse settings generated more heat than historical data, improved efficiency may mitigate the risk of incisional burns.