| CPC A61F 9/00745 (2013.01) [A61F 9/007 (2013.01); A61M 1/73 (2021.05); A61M 1/77 (2021.05); A61M 2205/3317 (2013.01); A61M 2205/3337 (2013.01); A61M 2205/702 (2013.01)] | 20 Claims |
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1. An ophthalmic surgical system comprising:
a handpiece with a working tip for performing an ophthalmic surgical procedure inside an eye;
an irrigation system for delivering irrigation fluid to the eye during the ophthalmic surgical procedure, the irrigation system comprising an irrigation source, an irrigation path in the handpiece, and irrigation tubing between the irrigation source and the irrigation path in the handpiece;
an aspiration system for aspirating aspiration fluid from the eye during the ophthalmic surgical procedure, the aspiration system comprising an aspiration path in the handpiece, aspiration tubing extending from the aspiration path in the handpiece, and a pump for providing suction through the aspiration tubing and aspiration path in the handpiece; and
a pressure sensor system in communication with one of the irrigation path or the aspiration path, the pressure sensor system comprising:
a conductive, movable diaphragm having a first side opposite a second side, the first side of the diaphragm facing a flow path for one of the aspiration fluid being aspirated from the eye or the irrigation fluid being delivered to the eye, wherein the diaphragm is configured to move in response to fluid pressure in the flow path, the fluid pressure being exerted on the first side of the diaphragm; and
an eddy current position sensor in communication with the diaphragm without contacting the diaphragm, the eddy current position sensor comprising a position sensor coil activatable by high frequency alternating current and signal conditioning electronics capable of sensing variation in inductance, impedance, or resonant frequency in the position sensor coil as a gap between the second side of the diaphragm and the position sensor coil changes in response to the fluid pressure in the flow path and of translating that variation into a displacement signal correlated to the fluid pressure in the flow path.
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