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Heat profiling of phacoemulsification tip using a thermal scanning camera.

Wei Kiong Ngo1, Louis W Lim, Colin S H Tan

  • 1Department of Ophthalmology, Tan Tock Seng Hospital, Singapore, Singapore.

International Ophthalmology
|March 21, 2013
PubMed
Summary

Phacoemulsification tip temperatures were measured using different modes and settings. Hyperpulse and waveform modulations significantly reduce heat generation compared to continuous phaco, especially with irrigation on.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Cataract surgery utilizes phacoemulsification (phaco) to remove the lens.
  • Phaco tip heat generation is a critical factor in preventing intraocular tissue damage.
  • Understanding heat profiles of different phaco modes is essential for surgical safety.

Purpose of the Study:

  • To measure and compare the heat profile of the phacoemulsification tip.
  • To evaluate the impact of continuous, hyperpulse, and waveform power modulations on tip temperature.
  • To assess the influence of irrigation and varying power/duty cycle settings on heat generation.

Main Methods:

  • Experimental study using the Millennium Microsurgical System with Custom Control Software (CCS).

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  • Thermal imaging of the phaco tip in air to measure temperature.
  • Testing continuous, hyperpulse (rise time 1 and 2), and waveform modulations.
  • Varying power settings (20-100%) and duty cycles (40-90%) with and without irrigation.

    • Main Results:

    • With irrigation on, continuous phaco generated the highest tip temperatures, followed by hyperpulse modes.
    • With irrigation off, hyperpulse with rise time 2 produced the highest temperatures, followed by continuous phaco.
    • Lower duty cycles and lower ultrasound power consistently resulted in less heat generation.
    • Hyperpulse and waveform modulations reduced heat compared to continuous mode when irrigation was active.

    Conclusions:

    • Hyperpulse and waveform power modulations offer a safer alternative to continuous phaco by reducing tip heat generation, particularly with irrigation.
    • Optimizing ultrasound power and duty cycle settings is crucial for minimizing thermal risk during phacoemulsification.
    • These findings support the use of advanced phaco modulation techniques to enhance surgical safety in cataract procedures.