Method of controlling a surgical system based on a load on the cutting tip of a handpiece
First Claim
1. A method of controlling a surgical system, the surgical system having an ultrasound handpiece, the ultrasound handpiece having a cutting tip for cutting tissue, the method comprising the steps of:
- establishing a threshold power level;
monitoring a load on the cutting tip of the ultrasound handpiece by monitoring a voltage and a current drawn by the handpiece during a sense interval, the sense interval being between cutting intervals, the sense interval comprising a non-zero sense power pulse;
comparing the amount of power drawn by the handpiece and the threshold power level;
adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece if the power drawn by the handpiece exceeds the threshold power level by adjusting an amplitude or stroke of the output of the ultrasound handpiece; and
adjusting an amount of power to be delivered to the cutting tip with a sensitivity coefficient.
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Accused Products
Abstract
A surgical system that is able to sense the onset of an occlusion or other surgical event as well as the instant an occlusion breaks. To help avoid overheating of the tip, the system determines an approximate temperature of the eye using an irrigation flow rate and reduces the power to the handpiece automatically if an overheating situation is predicted. Alternatively or in addition, the system monitors the power drawn by the handpiece, which is indicative of the cutting load on the tip, and automatically adjusts the power or stroke of the tip to compensate for increased loads on the tip.
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Citations
32 Claims
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1. A method of controlling a surgical system, the surgical system having an ultrasound handpiece, the ultrasound handpiece having a cutting tip for cutting tissue, the method comprising the steps of:
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establishing a threshold power level; monitoring a load on the cutting tip of the ultrasound handpiece by monitoring a voltage and a current drawn by the handpiece during a sense interval, the sense interval being between cutting intervals, the sense interval comprising a non-zero sense power pulse; comparing the amount of power drawn by the handpiece and the threshold power level; adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece if the power drawn by the handpiece exceeds the threshold power level by adjusting an amplitude or stroke of the output of the ultrasound handpiece; and adjusting an amount of power to be delivered to the cutting tip with a sensitivity coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of controlling a surgical system, the surgical system having an ultrasound handpiece, the ultrasound handpiece having a cutting tip for cutting tissue, the method comprising the steps of:
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establishing a threshold power level; monitoring a load on the cutting tip of the ultrasound handpiece by monitoring a voltage and a current drawn by the handpiece during a sense interval, the sense interval being between cutting intervals, the sense interval comprising a non-zero sense power pulse; comparing the amount of power drawn by the handpiece and the threshold power level; and adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece if the power drawn by the handpiece exceeds the threshold power level by adjusting a duration of the cutting power interval; and adjusting an amount of power to be delivered to the cutting tip with a sensitivity coefficient. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification