Tightening device for spine surgery

A surgical device for use during spinal surgery, the device comprising:

• a torque-generating body having a proximal end and an opposing distal end and defining a longitudinal axis extending therebetween, the proximal end coupled to a handle;
• a drive shaft rotatably driven by the torque-generating body, the drive shaft having a proximal end, an opposing distal end and a longitudinal axis extending therebetween, the proximal end of the drive shaft being operatively engaged to the distal end of the torque-generating body, wherein rotation of said handle about the longitudinal axis of the drive shaft causes the drive shaft to rotate;
• an anti-torque device where a proximal end of the anti-torque device is fixed from rotating relative to at least a portion of the torque-generating body;
• and
• an end member provided at the distal end of the torque-generating body, the end member having a noncircular shape in cross-section, where the drive shaft is rotatably received within a central opening of the end member,
• wherein the proximal end of the anti-torque device comprises a central opening which is slidably engaged to a corresponding longitudinally extending receiving face provided on the end member,
• wherein a portion of the central opening that engages the longitudinally extending receiving face and the corresponding longitudinally extending receiving face are non-threaded surfaces.