Abstract
PurposeTo compare a modified phacoemulsification tip with the established micro tip, in terms of temperature at the corneal wound, efficiency, and chatter events, using the Centurion® Vision system.MethodsEighty porcine eyes were randomized into 4 groups: 1)sleeveless conventional 45D MiniFlared ABS® Kelman tip (1.1-mm incision); 2)sleeveless new modified 45D ABS® INTREPID® balanced tip(1.1-mm incision); 3) Kelman tip with own sleeve (2.2-mm incision); 4)Balanced tip with modified 4-rib sleeve (2.2-mm incision). Measurements were taken with 2 settings: longitudinal(power 40% and 70%) and torsional mode (power 40% and 100%). Peak temperatures were measured 0, 10, 30, and 60 seconds after continuous ultrasound power. For the efficiency test, porcine lens nuclei were formalin soaked and cut into 2.0 mm3 cubes. Efficiency and chatter were examined.ResultsIn all longitudinal settings, the sleeveless groups(1 and 2) showed lower temperatures than the sleeved groups(3 and 4) (P = 0.003). In 100% torsional mode, groups 3 and 4 produced significantly different temperatures(37.13 ± 1.44 and 35.14 ± 0.54, respectively; P = 0.007).The efficiency, in a 100% power torsional setting, was13.52 ± 2.60 sec for group 4, and 44.45± 14.75 sec for group 3 (P<0.001).ConclusionsThe two different bare tips show no significant differences in thermogenesis. However, the balanced tip with sleeve produces lower temperaturesat100% torsional power and better efficiency than the Kelman tip.
Highlights
Eighty porcine eyes were randomized into 4 groups: 1)sleeveless conventional 45D MiniFlared ABS1 Kelman tip (1.1-mm incision); 2)sleeveless new modified 45D ABS1 INTREPID1 balanced tip(1.1-mm incision); 3) Kelman tip with own sleeve (2.2-mm incision); 4)Balanced tip with modified 4-rib sleeve (2.2-mm incision)
The two different bare tips show no significant differences in thermogenesis
As methods for performing cataract surgery have improved from intracapsular cataract extraction to microincision cataract surgery (MICS), the incision size has decreased
Summary
As methods for performing cataract surgery have improved from intracapsular cataract extraction to microincision cataract surgery (MICS), the incision size has decreased. MICS, with incisions ranging from 1.6 to 2.2 mm, is becoming increasingly popular because it is often associated with many advantages, such as the use of a lower effective phaco power,[1] a reduction in surgically induced astigmatism, and faster refractive stability.[2] Reduction of the incision size can still generate significant thermal energy at the incision site and cause corneal burns[3]. This thermal generation is one of the important factors to consider in the development of new phaco tips. Sleeve has been modified with 4 rib- like space as well (Fig 1)
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