title: Objective comparison of 4 nonlongitudinal ultrasound modalities regarding efficiency and chatter.
abstract: OBJECTIVE
  To compare efficiency and chatter of Infiniti Ozil with and without Intelligent Phacoemulsification (IP) and the Signature Ellips with and without FX.
  
  
  METHODS
  John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.
  
  
  METHODS
  Experimental study.
  
  
  METHODS
  Brunescent 2.0 mm human lens cubes were created by an instrument devised for this study. Cubes were tested (10 per test) for time of particle removal (efficiency) and for the number of times the lens particle bounced off the tip (chatter) at 300 mm Hg and 550 mm Hg, 50% and 100% power, and 50% and 100% amplitudes (amplitude for Ozil only).
  
  
  RESULTS
  Of the ultrasound settings, efficiency varied from a mean of 3.3 seconds ± 1.4 (SD) to 50.4 ± 11.7 seconds and chatter from 0.0 to 52.0 ± 16.7 bounces per run. The Ozil-IP was generally more efficient than the Ozil and the Ellips FX more efficient than the Ellips. At optimized values, the Ozil-IP and Ellips-FX were similar. In general, efficiency and chatter were better at 550 mm Hg and at 50% power. The amplitude effect was complex. Efficiency closely correlated with chatter (Pearson r(2) = .31, P<.0001).
  
  
  CONCLUSIONS
  Objective comparison of phacoemulsification efficiency and chatter found that optimized Ozil-IP and Ellips-FX were similar in both parameters and in general, both performed better than preceding technology. The study parameters can significantly affect efficiency and chatter, which strongly correlate with each other.
authors.affiliation: Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah 84132, USA.
authors.forename: David L
authors.initials: DL
authors.lastname: DeMill
authors.forename: Brian E
authors.initials: BE
authors.lastname: Zaugg
authors.forename: Jeff H
authors.initials: JH
authors.lastname: Pettey
authors.forename: Jason D
authors.initials: JD
authors.lastname: Jensen
authors.forename: Griffin J
authors.initials: GJ
authors.lastname: Jardine
authors.forename: Gilbert
authors.initials: G
authors.lastname: Wong
authors.forename: Randall J
authors.initials: RJ
authors.lastname: Olson
mesh_terms: D002386:Cataract / Q000473:pathology*; D019220:High-Energy Shock Waves; D006801:Humans; D007908:Lens, Crystalline / Q000737:chemistry / Q000473:pathology / Q000601:surgery*; D018918:Phacoemulsification / Q000295:instrumentation* / Q000592:standards; D014465:Ultrasonics / Q000592:standards*