Micro-burst ultrasonic power delivery
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United States of America Patent
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Feb 3, 2009
Grant Date -
Oct 28, 2004
app pub date -
May 25, 2004
filing date -
Jan 22, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
Phacoemulsification apparatus includes a phacoemulsification handpiece having a needle and an electrical system for ultrasonically vibrating said needle along with a power source for providing pulsed 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 varies a power level duty cycle provided to the handpiece electrical system from the power source and/or modify the aspiration flow rate. In addition, a separate input enables manual control of pulse amplitude. The control system provides a pulsed electrical power of less than 20 millisecond pulse duration.
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