title: [Automatic pulse system for conducting ultrasonic cataract operation].
abstract: OBJECTIVE
  For use in phacoemulsification and aspiration (PEA) with a high frequency pulse sytem, we invented an Automated Pulse System(APS) in which the ultrasonic energy level and the percentage of ultrasonic pulses per second are regulated by a foot-pedal and suotion mechanism.
  
  
  METHODS
  We compared the APS and the conventional continuous ultrasonic system experimentally by inserting a cataract model in an extracted aphakic pig eye.
  
  
  RESULTS
  Ultrasonic use time was not significantly different between the two methods. Gross ultrasonic energy and operation time were significantly decreased in the APS method (p < 0.05).
  
  
  CONCLUSIONS
  Automatically, APS increases ultrasonic frequency and the percentage of ultrasonic pulses in nuclear emulsification. APS is an effective way to reduce the utilization of ultrasonic energy in the pulse mode without complicated foot-pedal control.
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Showa, Fujigaoka Hospital, Japan.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Yaguchi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Nishihara
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Ogura
authors.forename: Satoshi
authors.initials: S
authors.lastname: Suzuki
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D018918:Phacoemulsification / Q000295:instrumentation*; D013552:Swine; D014464:Ultrasonic Therapy / Q000295:instrumentation*