Device for fixing a rod and a spherical symmetry screw head

A spine stabilizing system comprising:

• two pedicular screws, each one being adapted to be screwed into a pedicle of a vertebra and having a substantially spherical head;
• a transverse rod having a first and a second end;
• two fixing devices, each fixed device comprising:
• a first longitudinal member having a first surface and an opposite second surface, said first surface of said first longitudinal member having a first end, a middle part and a second end, said first end being provided with an opening, the wall of said opening forming a first portion of a spherical suface;
• a second longitudinal member adapted to cooperate with said first longitudinal member and having a first end, a middle part and a second end, said first end of said second longitudinal member being provided with an opening, the wall of said opening forming a second portion of a spherical surface, said middle part of said second longitudinal member being provided with a housing extending on a direction substantially perpendicular to the length of said longitudinal member;
• and
• first fastening and adjustment means mounted at the second end of said first longitudinal member and said second longitudinal member for moving said second end of said first longitudinal member towards said second longitudinal member,
• wherein one of the first and second ends of said transverse rod can be placed within said housing of said second longitudinal member and facing said middle part of the first surface of said first longitudinal member, said spherical head of one of said two pedicular screws can be placed between said portions of spherical surfaces formed by said openings of said first and second longitudinal members, so that when said first fastening and adjustment means are operated, said spherical screw head is pressed against said portion of spherical surfaces and said longitudinal member is pivited around said end of the said transverse rod placed in the housing of said second longitudinal member;
• a longitudinal rod;
• and
• a connecting systen for connecting said longitudinal rod with said two fixing devices.