Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"

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Ultrasound and Laser Phacoemulsification: Transmission of Acoustic Energy Is Measured in a Model System

Kaskel-Paul S.1, Wilkens V.2, Koch C.2, Höh H.1
1Augenklinik im Dietrich-Bonhoeffer-Klinikum Neubrandenburg
2Fachlabor Ultraschall, Physikalisch-Technischen Bundesanstalt Braunschweig

Purpose: Endothelial cell loss and, occasionally, thermal damage and corneal burns are side effects of ultrasound phacoemulsification. They may be caused by mechanical irritation during the operation as well as thermal and acoustic effects of the ultrasound. Endothelial cell loss also occurs during laser phacoemulsification. This may be due to mechanical or thermal damage. Our aim was to quantify the amount of acoustic energy the eye is exposed to.
Method: Using either the ultrasound phaco machine Harmony (DORC, Groningen, NL) or the erbium laser phaco machine Phacolase (Asclepion Meditec, Jena, Germany), we simulated phacoemulsification in enucleated pigs' eyes. Temperature change was measured in the anterior chamber at the level of the corneal endothelium and other levels and at the site of the corneal incision. Ultrasound power was between 20 and 100 percent of maximum power (50 W according to the manufacturer). Laser single pulse energy was between 5 and 20 mJ with a repetition rate of 80 to 100 Hz. As a preliminary experiment we determined the acoustic power coupled into aqueous media, using hydrophones in gas-free water in an absorber-clad basin.
Results: Typical ultrasound phacoemulsification as u

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