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Thermal characterization of lensectomy probes operated in elliptical, torsional and longitudinal phacoemulsification modalities

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Session Details

Session Title: Cat Surgery Equip/Phaco

Session Date/Time: Monday 15/09/2014 | 14:30-16:00

Paper Time: 15:24

Venue: Boulevard F (Level 1)

First Author: : J.Zacharias CHILE

Co Author(s): :                  

Abstract Details


To characterize the thermal behavior of lensectomy probes operated in elliptical, torsional and longitudinal phacoemulsification modalities using advanced temperature recording technologies


Clinica Oftalmologica Pasteur, Santiago, Chile


High rate infrared imaging and micro-thermocouple measurements were used to detect surface temperature of sleeved phaco needles activated in elliptical, torsional and longitudinal modalities. Inter-layer frictional heat build-up was studied for sleeved needles using a calibrated load to simulate conditions of suitably sized clear corneal incisions. Low-flow/low-cooling operating condition were invoked by simulating occlusion events


Needle-sleeve friction heat generation was detected while using a calibrated load extending between 4 and 8 mm proximal to the needle tip. Torsional activation was used in continuous modality. Longitudinal and elliptical activation were tested in continuous mode and also tested using a modulation scheme with a duty cycle of 33%. Simulated occlusion events produced comparable temperature increase for elliptical and longitudinal activation, of higher magnitude than the one observed with torsional. Overall phacoemulsification hand-piece distal end warming up was higher for elliptical, followed by longitudinal, being torsional the activation mode that produced less overall heating


Temperature increase by needle-sleeve friction at the incision location is the more significant source of heat. Elliptically and longitudinally operated phacoemulsification probes exhibit similar thermal behaviors. Torsional vibration mode exhibits a thermal footprint with reduced heat generation when compared to elliptical and longitudinal phacoemulsification modalities. Longitudinal and elliptical modulation schemes with a duty cycle of 33% produced similar heat as continuous torsional at power

Financial Interest:

One or more of the authors... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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