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

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

Purpose:

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

Setting:

Clinica Oftalmologica Pasteur, Santiago, Chile

Methods:

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

Results:

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

Conclusions:

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