[Automatic pulse system for conducting ultrasonic cataract operation].
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.
Yaguchi
Shigeo
S
Department of Ophthalmology, School of Medicine, University of Showa, Fujigaoka Hospital, Japan.
Nishihara
Hitoshi
H
Ogura
Hirotsugu
H
Suzuki
Satoshi
S
D000818:Animals; D004195:Disease Models, Animal; D018918:Phacoemulsification / Q000295:instrumentation*; D013552:Swine; D014464:Ultrasonic Therapy / Q000295:instrumentation*