Patent ID: 8202287

Claim:
An apparatus comprising: a handpiece having a needle, the handpiece configured to ultrasonically vibrate said needle; a power source configured to provide power to the handpiece; and a controller configured to control delivery of the power supplied from the power source to the handpiece during a surgical procedure, wherein the delivery comprises: applying at least one pulse each comprising a pulse shape, wherein at least one pulse shape comprises: a predetermined pulse shape portion; and at least one selected from the group consisting of: an increased energy portion comprising an increase in energy proportional to an increase in sensed aspiration vacuum pressure; and a decreased energy portion comprising a decrease in energy proportional to a decrease in sensed aspiration vacuum pressure; wherein the at least one increased energy portion or decreased energy portion is computed based on actual sensed aspiration vacuum pressure multiplied by maximum pulse amplitude minus minimum pulse amplitude and divided by maximum sensed aspiration pressure, added to minimum pulse amplitude.