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Systems and methods for power and flow rate control

  • US 8,715,220 B2
  • Filed: 09/23/2011
  • Issued: 05/06/2014
  • Est. Priority Date: 09/08/2006
  • Status: Active Grant
First Claim
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1. A method of operating a handpiece, comprising:

  • placing the handpiece in an operative relationship with an eye for a surgical procedure;

    supplying irrigation fluid from an irrigation fluid source to the eye;

    applying vacuum from a vacuum-based fluid transport device to the handpiece in order to aspirate the irrigation fluid from the eye through the handpiece;

    sensing a pressure difference value between an upstream pressure value measured upstream of a flow restrictor and a downstream pressure value measured downstream of the flow restrictor within a fluid line corresponding to an occlusion of the handpiece;

    determining a duration of occlusion; and

    restricting fluid flow using the flow restrictor based on the duration of occlusion and the pressure difference value;

    wherein the vacuum based fluid transport device is downstream of the flow restrictor.

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