title: [Capsulorhexis using an ultrasound-controlled cannula].
abstract: Every cataract surgeon performing phacoemulsification has unintentionally damaged the posterior capsule. Thus he knows that the device is suitable for cutting the lens capsule. In recent years, I have performed various modifications of capsulorhexis with the aid of an ultrasound-guided cannula in all patients undergoing phacoemulsification. The following method proved to be practicable: The ultrasound-guided cannula is pressed on the lens capsule at 12 o'clock, thus opening the anterior capsule; the cannula is consecutively guided in two semicircular movements from 12 o'clock to 6 o'clock, and the anterior capsula is torn and cut open by directing the opening of the cannula toward the center of the pupil and simultaneously on the anterior capsula and away from the iris, thus making it possible to cut directly at the pupillary margin without damaging the iris. The anterior capsular tear has a smooth circular edge at the intersection of the two semicircles of the capsulorhexis, while a triangular flap directed towards the center of the pupil is often formed at 12 o'clock. At the end of phacoemulsification, the flap is aspirated with the suction rinsing device and cut off with a sharp cannula. This procedure simplifies and accelerates phacoemulsification.
authors.affiliation: Augenklinik, Klinikum Steglitz, Freie Universität Berlin.
authors.forename: F
authors.initials: F
authors.lastname: Hoffmann
mesh_terms: D002387:Cataract Extraction / Q000295:instrumentation*; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control; D007498:Iris / Q000293:injuries; D013396:Suction / Q000295:instrumentation; D014463:Ultrasonography / Q000295:instrumentation*
vernacular_title: Kapsulorhexis mit Hilfe einer ultraschallgeführten Kanüle.