| 摘要 |
System for the application of axial prestressing to obtain stable and elastic osteosynthesis of fractures. The stability of the system is ensured by the collaborative action of the tendons for the application of axial prestressing, the Medullary Guide and the repositioned fracture. The elasticity and durability of the osteosynthesis is obtained by the articulated anchorage of the Prestressing Tendons. The system consists of: a) Thin Prestressing Tendons; b) Fulcrum for Bone Protection (Fig. II 6); c) Annular Distribution Washer (Fig. II 8); d) Medullary Guide of intraosseous forces and Prestressing Tendons (Fig. I, Ia, Ib). The Prestressing Tendons are thin wires or bands made of metal or other material. The one end of the Prestressing Tendons forms a sphere for the creation of a joint at their points of anchorage at the Medullary Guide and the Fulcrum for Bone Protection. Their other end is anchored into the conical cavity (female cone) of the Fulcrum for Bone Protection. The Fulcrum for Bone Protection (Fig. II 6) protects the bone from the pressure forces caused by the Prestressing Tendons. The Annular Distribution Washer (Fig. II 8) has a concave or a convex shape, depending on the bone surface on which it is adapted. The Modullary Guide (Fig. I, Ia, Ib), is a cylindrical body which can get several shapes depending on the bone. It is elastically compressible along its lateral axis, resistant along its longitudinal axis, and forms joints with the spherical ends of the Prestressing Tendons. |
