Used to elevate and/or detach the periosteum (membrane of fibrous connective tissue tightly surrounding bone) from the underlying bone by a pushing action usually applied along the longitudinal axis of the bone. It is typically a one-piece instrument made of high-grade stainless steel; it is available in a wide variety of sizes and blade designs [e.g., slender or robust, curved, spoon-shaped, or flat (chisel-like)].. (aka: Raspatory) To detach and lift the tissue and periosteum from the bone..