Abstract: A self-gradually locking chuck for drills or similar devices particularly suitable for portable drills used in surgery. It includes a cylindrical sleeve which can be coaxially fixed to a rotating shaft, a ferrule having a conical section provided internally with lobes, a cylindrical portion at one of its ends for engagement with said sleeve and a cylindrical portion at the other end. A first mounting, perforated longitudinally by a hole, includes a central portion having locking jaws which are movable in holes in a direction convergent upon the axis of the chuck and two second mountings opposite to the central body. A spring and centering device are provided. A cylindrical ferrule is threaded to a part of the first mounting as it projects from the first-mentioned ferrule. The first mounting and ferrule move axially in relation to each other and in relation to the cylindrical sleeve in which the ferrule can be releasably secured to the cylindrical ferrule by a retaining device.

Abstract: The invention contemplates an orthopedic axial-fixation device wherein an extended range of body-length adjustment is achieved using three mutually telescoping members which are keyed against relative rotation, thereby preserving the selectively clamped orientation of pin mounts having ball-joint connection to the ends of the body. Separate selective clamping is available for securing a given extended relation of inner and intermediate body members and for securing a given extended relation of the intermediate and outer body members. Jacking mechanism for precision length adjustment of the body also uses three mutually telescoping threaded members so configurated that rotation of one of these threaded members is operative to provide jack expansion or retraction which serves the fullest possible range of body-length adjustability.

Abstract: The invention contemplates orthopedic external minifixation apparatus comprising two articulated members having two clamps, each of which is carried by a different one of the articulated members. The articulating connection between members includes provision for simple and rapid alignment of the articulation axis with the articulation axis of the joint between two bones to be treated, thereby permitting early functional re-education and reduction of healing time. In its preferred form, several embodiments are disclosed.

Abstract: Apparatus for the external setting or securing of the parts of a fractured bone, comprising an elongate central body member comprised of two parts mutually displaceable parallel to the longitudinal axis of said member, whereby each part of the central body member supports a clamping device for the pins to be inserted into a part of the bone. The two mutually displaceable parts are engaged by a pressing and tensioning device causing the mutual longitudinal displacement of the part. When the pins are inserted in the bone parts to be pressed together, the pressing and tensioning device is actuated until the two bone sections abut against each other at the required pressure. Then the securing devices fix the two parts of the central body member into their position. Subsequently, the pressing and tensioning device is removed from the central body member since it is no longer required.