Systems and methods for power and flow rate control
First Claim
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.
3 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for fluid control during aspiration. In an embodiment, an aspiration system includes an aspiration line having distal and proximal ends and an aspiration port defined in the distal end; a fluid transport device operatively coupled to the proximal end of the aspiration line; and a flow restrictor operatively coupled to the aspiration line in between the fluid transport device and the aspiration port. To measure occlusion within the line, first and second pressure sensors are utilized, the first sensor being operatively coupled to the aspiration line between the port and the restrictor and the second sensor being operatively coupled to the aspiration line between the restrictor and the fluid transport device. The pressure differential between the two sensors can provide an indication of the onset, presence, and/or elimination of an occlusion.
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Citations
11 Claims
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1. A method of operating a handpiece, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification