Abstract: A femoral head shaft prothesis is disclosed with an oblong shaft portion (2, 3) which can be implanted into a marrow cavity (not shown) of an upper thigh bone and can be attached therein by means of a cement layer. According to the invention raised areas in the form of nub rows (17, 18, 19, 21) with small surfaces by comparison to the size of the circumference of the shaft portion (2, 3) are formed at a small number of appropriate locations on said circumference of said shaft portion to serve as spacers in relation to the inner wall of the marrow cavity. The lower shaft portion (2) is formed to be cylindrical and is intended to be inserted into a cylindrically drilled marrow cavity of the femoral neck stump. In this manner a uniform cement layer thickness with only minimal interruptions is achieved, ensuring primary and long-term stability.

Abstract: Printer device with a thermal print head (70), the print line (71) of which is resiliently pressed against a transport roller (45), which, driven by a motor, transports material to be imprinted (50, 51). Profiled guides (42, 46) form a first feed track for the paper-like material to be imprinted (50) and a second feed track suitable for inserting cardboard-like material (51) to be imprinted. It is possible to use two transport rollers (45A, 45B) with individual drives side-by-side. A tear-off edge (36B) or a motor driven roller cutting assembly is disposed behind the print line (71).

Abstract: A hip-joint prosthesis has a ball head shaped to fit in an acetabulum, an elongated shaft adapted to fit in and between two opposite sides of a medullary cavity of a femur, and a stem between and connecting the head to one end of the shaft. This shaft is curved in a plane and has a concave longitudinal edge and a convex longitudinal edge. A laterally projecting shoulder between the stem and the shank is engageable against a sawed-off end of a femur in whose medullary cavity the shaft is engaged. The shaft is formed on its concave edge at its two ends with inner and outer engagement surfaces of planar shape. Between these engagement surfaces on the convex side there is formed an intermediate engagement surface. When mounted in a femur the inner and outer engagement surfaces engage against one side of the medullary cavity and the intermediate engagement surface against the other for firm mounting of the shaft in the femur.