Patent ID: 8951044
Filing Date: 2015-02-10
Classification: A61C

Abstract:
1. A keeper for an implant comprising (a) a keeper body made of a soft-magnetic material, which comprises a recess for receiving a head of an abutment having a female thread, and a female thread extending along a center axis to have communication with said recess and having a larger nominal diameter than that of the female thread of said abutment; and (b) a stepped screw member comprising a small-diameter screw portion threadably engageable with the female thread of said abutment, and a large-diameter screw portion threadably engageable with the female thread of said keeper body; said keeper body being strongly fixed to said abutment by said stepped screw member, when said keeper body is rotated in a threadably engaging direction, after the female thread of said abutment threadably engages said small-diameter screw portion, and after the female thread of said keeper body threadably engages said large-diameter screw portion.