Abstract: An occluder for closing an opening in a circuit system can be transferred from a compact manifestation which extends along a longitudinal axis into an expanded manifestation. The occluder has a first expansion unit and a second expansion unit which bear on in each case one side of the opening in the expanded manifestation. Furthermore, the occluder has a first coupling part and a second coupling part which can be brought into engagement with one another, with the result that they fix the occluder in its expanded manifestation. The first coupling part has a region which extends between the first and second expansion units in the expanded manifestation. According to the invention, this region is configured such that it can expand along the longitudinal axis. It is preferably configured such that it can expand counter to a restoring force, that is to say resiliently or elastically.

Abstract: An occluder for closing an opening in a circuit system can be transferred from a compact manifestation which extends along a longitudinal axis into an expanded manifestation. The occluder has a first expansion unit and a second expansion unit which bear on in each case one side of the opening in the expanded manifestation. Furthermore, the occluder has a first coupling part and a second coupling part which can be brought into engagement with one another, with the result that they fix the occluder in its expanded manifestation. The first coupling part has a region which extends between the first and second expansion units in the expanded manifestation. According to the invention, this region is configured such that it can expand along the longitudinal axis. It is preferably configured such that it can expand counter to a restoring force, that is to say resiliently or elastically.

Abstract: The invention relates to a pilot drill (1) for producing a pilot bore in a human jaw bone in preparation for its enlargement into a step bore, achieved by means of a first step drill (2) or if the step bore is further enlarged, by means of second and third step drills (2). The prepared step bore is designed to receive a dental implant, preferably in screw form. The pilot drill (1) and the first step drill (2) form a drill set. The pilot guide (11) on the pilot drill (1), comprising a step (124) lying in the transition region leading to the drill neck (12), positions the drill at the commencement of drilling in the corticalis, whereby the drilling direction can be corrected prior to the continued drilling down to the maximum depth of the pilot bore. The pilot guide (11) has a drill diameter (b1), whereas the step (124) leads into an enlarged drill diameter (b2). The step guide (21) of the first step drill (2) has a drill diameter (b2?) that corresponds to the drill diameter (b2).