title: Phaco-efficiency test and re-aspiration analysis of repulsed particle in phacoemulsification.
abstract: BACKGROUND
  To measure the efficiency of phacoemulsification, we have developed a new experimental model for testing phaco-efficiency and analyzed re-aspiration of repulsed particles.
  
  
  METHODS
  Using a Kitaro wetlab system, a piece of blood agar (BA) was placed in an artificial chamber and the phacoemulsifier was placed horizontally. The settings of the phacoemulsifier (Infiniti, Alcon Laboratories) were 26 cc/min for aspiration, 350 cc/min for vacuum, and 95 cm of bottle height. The time to remove BAs was measured using Ozil 100 %, Ozil 40 %, and longitudinal 40 % of phaco power. The angle between the re-aspirated BA particles and the axis of the phacoemulsifier (re-aspiration zone, degree) was analyzed.
  
  
  RESULTS
  The average time (seconds) to remove BAs was lower in the Ozil 100 % and the Ozil 40 % mode than in the longitudinal mode (0.37 ± 0.39, 0.85 ± 0.57, and 2.22 ± 1.40 respectively, P value < 0.01). Repulsion exceeding 1 mm occurred more frequently in the longitudinal mode than in the Ozil 100 % mode (100 % vs 40 %, P value = 0.01, Fisher's exact test). The average of re-aspiration zone was 25.9 ± 14.5 in the longitudinal 40 % and 54.0 ± 23.0 in the Ozil 40 % (P value = 0.016).
  
  
  CONCLUSIONS
  The Ozil mode was more efficient than the longitudinal mode. In addition, the Ozil mode provided less repulsion and wider aspiration zone.
authors.affiliation: Department of Ophthalmology, Chungbuk National University College of Medicine, Cheongju, Korea.
authors.forename: Jae-hyung
authors.initials: JH
authors.lastname: Kim
authors.forename: Dong-Ah
authors.initials: DA
authors.lastname: Ko
authors.forename: Jae Yong
authors.initials: JY
authors.lastname: Kim
authors.forename: Myoung Joon
authors.initials: MJ
authors.lastname: Kim
authors.forename: Hungwon
authors.initials: H
authors.lastname: Tchah
mesh_terms: D000867:Anterior Chamber; D001187:Artificial Organs; D006801:Humans; D057446:Hydrodynamics; D018918:Phacoemulsification / Q000379:methods / Q000592:standards*; D013396:Suction; D014618:Vacuum