A method to intraoperatively assess stapes prostheses for magnetic attraction

Area of Science:

• Otolaryngology
• Biomaterials Science
• Surgical Innovation

Background:

• Metallic otologic prostheses are crucial in reconstructive surgery.
• Assessing magnetic susceptibility of implants is vital to prevent complications, especially with the increasing use of magnetic resonance imaging (MRI).
• Current methods for assessing magnetic properties may not be suitable for intraoperative use.

Purpose of the Study:

• To introduce and validate a straightforward technique for intraoperative assessment of metallic otologic prostheses.
• To determine the magnetic susceptibility of otologic prostheses during the surgical procedure.

Main Methods:

• A sterile, handheld pacemaker magnet was employed for the assessment.
• The technique involved placing the magnet over the prosthesis and then the prosthesis directly onto the magnet.
• Prostheses exhibiting any magnetic attraction were rejected prior to implantation.

Main Results:

• No tested metallic otologic prostheses demonstrated magnetic attraction using the described method.
• Control tests using steel wire pieces of similar dimensions showed significant magnetic attraction to the pacemaker magnet.
• This indicates the technique's sensitivity in detecting magnetic properties.

Conclusions:

• Intraoperative screening of metallic otologic prostheses for magnetic susceptibility is feasible and effective.
• A sterile pacemaker magnet serves as a practical tool for this intraoperative assessment.
• This technique enhances patient safety by ensuring implant compatibility with magnetic fields.