Spinal tissue distraction devices that include at least one guide member for guiding a distraction device to a location between layers of spinal tissue. The guide member has a proximal end portion and a distal end portion. The distal end portion is adapted for insertion between the tissue layers and defines a shape of a desired support structure. The distraction device is slidably mounted on the guide member for advancing the distraction device distally along the guide member for insertion of the distraction device between the tissue layers. The distraction device substantially conforms to the shape defined by the distal end portion of the guide member to form a support structure that separates, supports or both separates and supports the tissue layers.