A handle assembly for a prosthesis delivery device is disclosed. The handle assembly has a proximal gripping portion and a stationary gripping portion. At least one rail extends distally from the proximal gripping portion through the stationary gripping portion. The proximal gripping portion is distally moveable along a longitudinal axis towards the stationary gripping portion from a first pre-deployment position to a second position. The at least one rail extends proximally from the stationary gripping portion when the proximal gripping portion is in a first pre-deployment position and distally from the stationary gripping portion when the proximal gripping portion is in a second position. The at least one rail is configured to prevent the build-up of torque along the length of the delivery device as well as prevent the build-up of torque among the various components of the handle assembly including the proximal gripping portion and the stationary gripping portion.
