Surgical retractor

A surgical retractor, comprising:

• a ribs assembly;
• and
• a mechanism for transferring of linear and rotational movements adapted to apply mechanical forces and moments to said ribs assembly;
• wherein said mechanism for transferring of linear and rotational movement includes:
• (1) a casing;
• and (2) a grooved disc configured to rotate inside said casing, wherein said grooved disc has a grooved disc central perforation center located inside said casing, wherein said grooved disc has a grooved disc body, wherein said grooved disc has at least two curved grooves formed in said grooved disc body, and wherein said grooved disc has grooved disc teeth disposed on said grooved disc body;
• wherein said casing includes:
• (1) a channeled disc;
• and (2) a cover disc disposed on said channeled disc;
• wherein said channeled disc has a cover disc base, a cover disc wall disposed on said cover disc base, a cover disc base interior thread formed on said cover disc base, wherein said cover disc base has a cover disc perforation, wherein said channeled disc has a channeled disc base a channeled disc wall disposed on said channeled disc base and at least two tracks disposed on said channeled disc base wherein said channeled disc base has a channeled disc perforation.