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The magnetic apnea prevention (Mag-Nap) system utilizes an N52-grade neodymium-iron-boron magnet encased in titanium with a ferromagnetic directional back plate that is implanted onto the hyoid bone (left). The custom-fitted removable external neck accessory (right) to be worn during sleep contains a second magnet that attracts the implanted hyoid magnet forward to keep the airway open [102]. (Permission for use granted by Mag-Nap Inc., San Francisco, CA, USA).
