title: Comparison of actual vacuum pressures at the end of 3 phacoemulsification tips in swine eyes.
abstract: OBJECTIVE
  To compare the actual vacuum pressure at the end of an aspiration bypass system (ABS) phaco tip and a conventional tip in conditions similar to those during human cataract surgery.
  
  
  METHODS
  Kangbuk Samsung Hospital, Seoul, Korea.
  
  
  METHODS
  A 4.0 mm diameter rubber eraser ball was inserted in a phacoemulsified swine eye and engaged to a phaco tip. With a vacuum pressure of 300 mm Hg, the eraser ball was pulled in the opposite direction with the phaco tip. The pulling power separating the eraser ball from the phaco tip was measured using the volume of water dripped into a container connected to the eraser ball. Measurements were taken with an Infiniti ABS tip and 2 conventional tips: Sovereign (conventional tip S) and Infiniti (conventional tip I). Measurements were taken alternatively at random in the same eye.
  
  
  RESULTS
  The mean pulling power was 17.35 mL +/- 5.01 (SD) with conventional tip S and 16.85 +/- 4.45 mL with conventional tip I. The mean pulling power of the ABS tip was 13.35 +/- 4.32 mL, which was a mean 20.8% lower than that of conventional tip I (P = .016) and 23.1% lower than that of conventional tip S (P = .010).
  
  
  CONCLUSIONS
  The actual vacuum pressure of the phaco tip was significantly influenced by the presence of the ABS hole. To compensate for the decrease in actual vacuum pressure, surgeons should be aware of the characteristics of the ABS tip being used and change the standard settings accordingly.
authors.affiliation: Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Park
authors.forename: Chul Young
authors.initials: CY
authors.lastname: Choi
authors.forename: Joon Mo
authors.initials: JM
authors.lastname: Kim
authors.forename: Hae Ran
authors.initials: HR
authors.lastname: Chang
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
authors.forename: Jae Chan
authors.initials: JC
authors.lastname: Kim
mesh_terms: D000818:Animals; D018918:Phacoemulsification / Q000295:instrumentation*; D011312:Pressure; D013396:Suction; D013552:Swine; D014618:Vacuum