| 摘要 |
<p>Phacoemulsification apparatus includes a phacoemulsification handpiece (30) having a needle and an electrical system for ultrasonically vibrating said needle along with a power source (16) for providing electrical power to the handpiece electrical system. Irrigation fluid is provided to the handpiece needle and aspirating fluid is removed from the handpiece needle. A determination of a voltage current phase relationship of the provided electrical power is made and in response thereto a control system (22) varies a power level duty cycle provided to the handpiece electrical system from the power source and/or modify the aspiration flow rate.</p> |
