Comparison of thermal features associated with 2 phacoemulsification machines

Abstract

The machines behaved fundamentally differently, with the Legacy Advantec controlling stroke length and Sovereign controlling a fixed power at any setting. Therefore, workload had a much bigger impact on Legacy Advantec thermal characteristics. Pulsing decreased heat produced directly related to the duty cycle. The most dangerous incision burn scenario is with continuous ultrasound, aspiration blocked, and a heavy workload.

Phacoemulsification tip vacuum pressure: Comparison of 4 devices

“…The percentage of power, however, is not comparable among machines. 1,2 Little is known about actual tip vacuum, which also may not be comparable between machines.…”

Effect of incisional friction and ophthalmic viscosurgical devices on the heat generation of ultrasound during cataract surgery

“…2 Due to the strokelength-determined foot pedal of the Legacy, with increased friction, power is increased to maintain the stroke length and therefore the Legacy had a 62% increase of energy production due to incisional friction. The results were very consistent with the same parameters used for both instruments.…”

“…2 For analysis, 2-tailed t tests were used and significance was set at P Z.0008 with a Bonferroni correction (61 comparisons were made).…”

Efficacy of Cruise Control in controlling postocclusion surge with Legacy and Millennium venturi phacoemulsification machines

“…In previous studies, [5][6][7][8] we showed how certain adjustable variables, such as the aspiration vacuum, aspiration flow rate, and phaco power, are not comparable among machines. We also found that the machines show considerable variance to surge with Cruise Control, with a small but statistically significant impact on the Sovereign unit (AMO) but not the Millennium peristaltic unit (Bausch & Lomb, Beverly Hills, CA).…”