| 摘要 |
<p>A method and apparatus for precisely controlling particle movement relati ve to a phacoemulsification needle tip is provided. The design monitors actu al vacuum present and calculates a pulse shape amplitude waveform proportion al to the amount of measured vacuum. An increase in vacuum indicates that th e handpiece/needle is becoming occluded by a large particle. The present des ign determines whether additional power is required to bump or move a large particle away from the needle tip. The present design may employ a control l oop that senses and continuously monitors vacuum. The design may dynamically vary the amount of ultrasonic energy delivered to the surgical area in resp onse to the observed actual vacuum, and can actively vary the amount of powe r delivered to the surgical area based on the size of the particle and the r esultant vacuum realized.</p> |
