Comparing the Efficiency of Fluid Infusion Systems for Pars Plana Vitrectomy.

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Medical Device Design

Background:

• Infusion sets are critical for maintaining intraocular pressure during ophthalmic surgery.
• Variations in infusion set design can significantly impact fluid dynamics and surgical safety.

Purpose of the Study:

• To evaluate and compare the efficiency of various leading infusion set brands in minimizing intraocular pressure drop during aspiration.
• To analyze pressure drop as a function of flow rate and correlate performance with infusion set design.

Main Methods:

• Pressure drop was measured in infusion sets (including tubing, infusion, and trocar cannulas of 23G, 25G, 27G) using a model eye.
• Flow rates were assessed with a balanced salt solution reservoir height ranging from 10 to 120 cm.
• Infusion set components' dimensions (length and inner lumen diameter) were recorded.

Main Results:

• Significant variations in pressure drop were observed across different manufacturers and gauges.
• BVI and DORC infusion sets exhibited higher efficiency at all tested gauges.
• Pressure drop at 10 mL/min ranged from 9-16 mm Hg (23G), 11-25 mm Hg (25G), and 16-50 mm Hg (27G).

Conclusions:

• Infusion set performance varied by a factor of two among manufacturers, impacting surgical safety.
• Understanding head loss mechanisms is crucial for designing more efficient and safer infusion systems.
• Findings provide insights for improving infusion system design to prevent hypotony.