Abstract: The device, designed to be fixed to the distal end of a fastener-positioning instrument, comprises a plane transverse distal end, a split first longitudinal channel and a second longitudinal channel, in which channels the anchoring bar and the stop bar of a fastener can slide, respectively. The device has a longitudinal bearing face that defines a half-space. The device further includes: a cam forming a stop/sliding surface for the distal end of the stop bar, in order to produce a pivoting movement of the stop bar; cams for the lateral splaying of the proximal part of the stop bar; and an escapement cam, allowing the lateral displacement of the distal part of the stop bar and its disengagement from the first cam.

Abstract: The device (5), designed to be fixed to the distal end of a fastener-positioning instrument, comprises a plane transverse distal end (9), a split first longitudinal channel (10) and a second longitudinal channel (20), in which channels the anchoring bar and the stop bar of a fastener can slide, respectively. The device has a longitudinal bearing face that defines a half-space. The device further includes: a cam (19) forming a stop/sliding surface for the distal end of the stop bar, in order to produce a pivoting movement of the stop bar; cams (15, 25) for the lateral splaying of the proximal part of the stop bar; and an escapement cam (17), allowing the lateral displacement of the distal part of the stop bar and its disengagement from the first cam.