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03/04/2010

Reduction of Corneal Burns Risk with Programmable Emission Mode in Phacoemulsification

The purpose of the present work is to evaluate the temperature variations into the corneal incision and inside the anterior chamber of the eye during the phacoemulsification procedure in the cataract surgery.
In phacoemulsification many new surgical techniques have been introduced, among which several new patterns for ultrasound emission, the aim being to reduce the energy needed to crush the cataract and, therefore, the mechanical and thermal damages to the surrounding structures of the eye.
All modern ultrasounds (US) handpieces use a piezoelectric crystal which converts electrical energy into mechanical oscillation, that is used to emulsify the crystalline lens of the eye.
The axial oscillation frequency of the tip is between 27.000 and 40.000 cycles per second; because of this oscillation, there is a friction between the phaco tip and the silicone sleeve that generates heat. This is transferred to the incision by thermal conduction and into anterior chamber by conduction and convection.
The purpose of this work is to correlate the thermal changes in the eye to various patterns of ultrasound emission, more specifically, traditional patterns and the ones designed with the new Programmable Emission Mode (PEM).
 

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