Add-On Fluidic Control System for Enhancing Intraocular Pressure Stabilization and Reducing Tissue Deformation

Maintaining introaocular pressure stability is critical to surgical effectiveness and safety in intraocular surgery. In cataract lens removal procedure, the continuous fluid irrigation and aspiration creates disturbances in the intraocular pressure, which subsequently causes deformation and damage to intraocular tissues. Incidental surge phenomena, when materials blocking the aspiration pathway are suddenly released, creating sudden pressure drop and cornea collapse. To improve the pressure stability under such severe pressure disturbances, this paper presents an add-on irrigation and pressure control system to existing fluid control machine. The effect of the enhanced dynamic response for the closed loop pressure control is demonstrated by reduced corneal deformation in pig eye experiment.