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 non-zero sense power interval, the sense power interval being between cutting power intervals;
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 an amplitude or stroke of the output of the ultrasound handpiece.
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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
80 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 non-zero sense power interval, the sense power interval being between cutting power intervals;
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 an amplitude or stroke of the output of the ultrasound handpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. 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 non-zero sense power interval, the sense power interval being between cutting power intervals;
comparing the amount of power drawn by the handpiece and the threshold power level;
if necessary, 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;
establishing a threshold temperature;
monitoring a pressure in an irrigation line to the handpiece;
calculating a rate of flow of the irrigation fluid;
determining a heat absorption capacity for the calculated rate of flow of irrigation fluid;
determining a temperature of an eye based on the determined heat absorption capacity and an amount of power being supplied to the ultrasound handpiece;
comparing the determined temperature of the eye to the threshold temperature; and
if necessary, adjusting the amount of power delivered to the cutting tip of the ultrasound handpiece based on the comparison of the determined and threshold temperatures;
- View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. The method of claim 42, further comprising cutting tissue during monitoring the load.
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43. 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 non-zero sense power interval, the sense power interval being between cutting power intervals;
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 an amplitude or stroke of the output of the ultrasound handpiece;
determining a rate of change of a first operating parameter of the surgical system;
determining a stage of occlusion based on the rate of change of the first operating parameter; and
adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece based on the determined stage of occlusion. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. 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 non-zero sense power interval, the sense power interval being between cutting power intervals;
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. - View Dependent Claims (66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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Specification