Globe stability during simulated vitrectomy with valved and non-valved trocar cannulas

Area of Science:

• Ophthalmology
• Surgical Technology
• Biomedical Engineering

Background:

• Maintaining stable intraocular pressure (IOP) is critical during vitrectomy.
• Fluid leakage and vitreous incarceration are potential complications.
• Cannula design may influence surgical outcomes.

Purpose of the Study:

• To compare the efficacy of valved versus non-valved cannulas.
• To assess the impact on intraocular pressure (IOP).
• To evaluate fluid leakage and vitreous incarceration during simulated vitrectomy.

Main Methods:

• Simulated vitrectomy performed on rubber, acrylic, rabbit, and porcine eyes.
• Used 23-, 25-, and 27-gauge valved and non-valved trocar cannulas.
• Measured IOP, fluid leakage, and analyzed vitreous incarceration.

Main Results:

• Valved cannulas maintained IOP and prevented leakage, unlike non-valved ones.
• Non-valved cannulas showed significant IOP loss and fluid leakage.
• Valved cannulas significantly reduced vitreous incarceration compared to non-valved cannulas.

Conclusions:

• Valved cannulas offer superior performance in maintaining IOP.
• Valved cannulas effectively prevent fluid leakage during vitrectomy.
• Valved cannulas significantly reduce the risk of vitreous incarceration.