A threaded insert is designed to snap into a standard bone plate hole. The insert has an upper section divided into sectors by slots, a lower section having deflectable tabs with external projections, and a central threaded hole. When a standard bone screw is tightened in the insert, the insert rigidly...http://www.google.co.uk/patents/US5976141?utm_source=gb-gplus-sharePatent US5976141 - Threaded insert for bone plate screw hole
