Method of controlling a surgical system based on irrigation flow
First Claim
1. A method of controlling a surgical system, the surgical system having an ultrasound handpiece, the ultrasound handpiece having a cutting tip, the method comprising the steps of:
- establishing a threshold temperature;
monitoring an irrigation pressure in a line running to the ultrasound 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 by enabling torsional vibration of the cutting tip.
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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 a temperature of an eye using 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
58 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, the method comprising the steps of:
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establishing a threshold temperature;
monitoring an irrigation pressure in a line running to the ultrasound 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 by enabling torsional vibration of the cutting tip. - View Dependent Claims (2, 3, 4, 15, 16)
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5. A method of controlling a surgical system, the surgical system having an ultrasound handpiece, the ultrasound handpiece having a cutting tip, the method comprising the steps of:
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establishing a threshold temperature;
monitoring an irrigation pressure in a line running to the ultrasound 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
determining a rate of change of the irrigation pressure;
determining a stage of occlusion based on the rate of change of the irrigation fluid; and
if necessary, adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece based on the determined stage of occlusion and based on the comparison of the determined and threshold temperatures by enabling torsional vibration of the cutting tip. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of controlling a surgical system, the surgical system having an ultrasound handpiece, the ultrasound handpiece having a cutting tip, the method comprising the steps of:
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establishing a threshold temperature;
monitoring an irrigation pressure in a line running to ultrasound 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
determining a rate of change of the irrigation pressure;
determining a stage of occlusion based on the rate of change of the irrigation fluid; and
if necessary, adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece based on the determined stage of occlusion and based on the comparison of the determined and threshold temperatures by enabling torsion vibration of the cutting tip, the power delivered to the handpiece being reduced if the determined temperature exceeds the threshold temperature, the power delivered to the handpiece being maintained or increased if the determined temperature is below the threshold temperature. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification