Adjustable rail clamp with clamp locking device

A surgical retractor system for attachment to a rail of a conventional surgical table comprising:

• a rail clamp assembly that includes a lower jaw member, the lower jaw member having an upper portion and a lower portion, the lower jaw member having an outer surface and an inner surface, the lower jaw member having a bored upper portion to form a cylindrical inside surface and a lower portion with a hollowed non-cylindrical uniform aperture having a first end in communication with the cylindrical bored upper portion and a second end open to atmosphere, the lower jaw member having a first jaw surface adapted for seating against one portion of the rail, the lower jaw member having a first set of threads disposed along a portion of the outer surface of the lower jaw;
• an upper jaw member having an outer surface and an inner surface, the inner surface of the upper jaw member disposed over the outer surface of the lower jaw member, the upper jaw member having a second jaw member for seating against one portion of the rail, the upper jaw member having a semi-circular section having a guide slot;
• a jaw drive member having an outer surface and an inner surface, the inner surface disposed on the outer surface of the lower jaw member, the jaw drive member having a second set of threads disposed on one section of the inner surface of the jaw drive member, the first set of threads of the lower jaw member mateable with the second set of threads of the jaw drive member for causing movement of the upper jaw member relative to the lower jaw member;
• a post extending slidably upward through the rail clamp assembly, the post having a cylindrical upper portion and a non-cylindrical lower portion, wherein the non-cylindrical lower portion of the post is slidably inserted into the hollowed non cylindrical aperture of the lower portion of lower jaw member preventing rotation of post in the rail clamp assembly;
• and
• a clamp locking device for releasably locking the post relative to the upper portion of the lower jaw member in a plurality of longitudinally spaced positions.