Bone anchor and deployment device therefor

(57) The summary rivet-like bone anchor could be set by the sloping bone surface, and equips the head with the floating washer which can fix an organization more strongly by it. A bone anchor possesses a rivet, an extensible sleeve, and a washer. The head is attached to the proximal end of the thin long main part of a rivet including the thin long main part in which, as for a rivet, at least a head, a proximal end, and 遠 have an end. A freely extensible sleeve has the inner hole made as receive / the main part of a rivet. A washer "floats" at the proximal end of a sleeve. If a rivet is inserted into a sleeve, a sleeve is extended, and it closes and 嵌合 to a bone. Furthermore, the head of a rivet makes an organization weld a floating washer by pressure at the angle corresponding to the bone surface under it. The bone anchor deployment instrument can develop an anchor, without applying unnecessary reaction force. Including an outside tube, the deployment instrument can hold a housing, when at least 遠 of this tube 螺合 an end in a housing, for example. While push in into the sleeve which can extend a rivet freely using the rod with which the inner hole of the tube was equipped free 摺動, making a sleeve extend in a bone, applying a floating washer to the bone surface and making it weld by pressure to a specified position by it, an anchor can be fractured and it can separate from a housing. This can be performed by wringing in the mode which strains the end of an injector, for example so that the proximal end of an outside tube and the proximal end of a rod may be mutually drawn near.