Calibration of trephine blade depth

Area of Science:

• Ophthalmology
• Surgical Instrumentation
• Corneal Surgery

Background:

• Accurate corneal lamellar dissection is vital for successful ophthalmic surgeries.
• The Barron radial vacuum trephine is a tool used for this procedure.
• Variability in instrument performance can impact surgical outcomes.

Purpose of the Study:

• To evaluate the accuracy and precision of the Barron radial vacuum trephine.
• To establish a method for calibrating this specific trephine for corneal lamellar dissection.

Main Methods:

• A practical calibration method was developed for individual trephines.
• Calibration utilized a microscope typically designed for diamond knives.
• The relationship between trephine rotation and blade displacement was measured.

Main Results:

• One full rotation (360 degrees) of the trephine resulted in an average blade displacement of 0.25 mm.
• Significant variability in displacement was observed among individual trephines.
• This highlights the need for individualized calibration.

Conclusions:

• Individual calibration of the Barron radial vacuum trephine is essential for achieving high accuracy.
• Using a calibration microscope is recommended for precise trephination in corneal procedures.