Low-profile offset-type spinal fusion device

A low-profile offset-type spinal fusion device, comprising:

• a first screw, furnished with an external thread and an annular flange;
• a connection base, comprising:
• a penetration part, furnished with a first hole;
• and
• a connection part, disposed at a side of the penetration part, having a top surface thereof located at the same level as or lower than a top surface of the penetration part, having a cavity for allowing a connecting bar to penetrate therethrough;
• wherein the connection base utilizes the first hole to sleeve outside the first screw so as to have the first hole to contact against a top portion of the flange, and to have opposite ends of the first screw to protrude out of the first hole;
• a nut, used to engage the first screw, having a bottom surface thereof to contact against the penetration part;
• wherein, when the first screw is installed by penetrating the first hole, the nut and the flange are located to opposite ends of the first hole;
• a compression part, used to be screwed into the cavity to depress the connecting bar tightly in the cavity;
• and
• a restraint block, wherein the connection base is furnished with a groove extending longitudinally between the first hole and the cavity, and the groove allows the restraint block to slide along;
• wherein, when the restraint block is in a release state, the restraint block is able to slide along the groove between the first hole and the cavity;
• wherein, when the restraint block is in a constraint state, opposite ends of the restraint block are contacted against the nut and the compression part, respectively.