Experimental anterior chamber maintenance in active versus passive phacoemulsification fluidics systems

Area of Science:

• Ophthalmology
• Surgical Technology
• Biomedical Engineering

Background:

• Phacoemulsification is a common cataract surgery technique.
• Maintaining stable intraocular pressure (IOP) is crucial for anterior chamber stability during surgery.
• Fluidics control systems in phacoemulsifiers manage fluid infusion and aspiration.

Purpose of the Study:

• To compare the ability of active versus passive fluidics control systems in phacoemulsifiers to maintain target intraocular pressures (IOPs).
• To evaluate IOP stability under varying aspiration flow rates in a simulated anterior chamber model.

Main Methods:

• An experimental study utilized an acrylic test chamber to simulate the anterior chamber of the eye.
• Passive (gravity-based) fluidics systems were tested at different infusion pressures (41, 75, 109 cm H2O).
• An actively controlled system was tested at target IOPs (30, 55, 80 mm Hg) across aspiration flow rates (15-60 cc/min).

Main Results:

• All systems maintained target IOPs under zero-flow conditions.
• Passive systems exhibited significant IOP drops (14.0–16.2 mm Hg per 15 cc/min increase in aspiration flow).
• The active system maintained target IOPs within 4.3 mm Hg across all tested aspiration flow rates.

Conclusions:

• Active fluidics control systems demonstrated superior ability to maintain target IOPs compared to passive systems.
• The findings suggest that active fluidics control may enhance anterior chamber stability during phacoemulsification surgery.
• This improved stability could lead to better surgical outcomes in cataract procedures.