A clamping device configured to secure a strap to a rail of a support and/or operating table so as to preventing the patient from slipping, providing optimal patient stability when the operating table is placed in angle positions, and eliminating patient re-positioning during surgical procedure. The clamping device comprising a body portion with a rail channel with a rail flange located on upper arms so as to engage the upper surface of the side rail and a pivot jaw assembly with jaw rail flange portions is connected to sides of the body portion hingedly operated between an open and closed position. The clamping device further comprising a body portion with a strap channel assembly having strap flange portions configured to hold a strap in the strap channel assembly and to secure the strap a side rail using a clamp bar and the rail flanges of the clamp assembly to a clamp to the side rail of an operating table.
