Method of controlling a surgical system based on a rate of change of an operating parameter
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:
- 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; and
adjusting an amount of power delivered to the cutting tip of the ultrasound handpiece based on the determined stage of occlusion.
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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 when an occlusion breaks. To help avoid overheating of the tip, the system of the present invention predicts the temperature of the 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 of the present invention 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
57 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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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; 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 (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. 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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detecting a pattern of data of an aspiration vacuum;
detecting a pattern of data of an irrigation pressure;
determining a rate of change of the aspiration vacuum;
determining a rate of change of the irrigation pressure;
determining a stage of occlusion based on the rate of change determinations; 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 (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. 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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detecting a pattern of data of an aspiration vacuum;
detecting a pattern of data of an irrigation pressure;
determining a rate of change of the aspiration vacuum;
determining a rate of change of the irrigation pressure;
determining a stage of occlusion based on the rate of change determinations, wherein an occlusion onset is identified by an increasing aspiration vacuum and an increasing irrigation pressure, a pre-occlusion condition is identified by an increasing aspiration vacuum and a substantially constant irrigation pressure. a full occlusion is identified by a substantially constant aspiration vacuum and a substantially constant irrigation pressure. a break of a full occlusion is identified by a decreasing aspiration vacuum and a decreasing irrigation pressure, and a recovery from an occlusion break is identified by a slowing of a rate of decrease of the aspiration vacuum and a slowing of a rate of decrease of the irrigation pressure; 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 (56, 57)
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Specification