A hand-held manual surgical instrument designed to lift/separate (elevate) or tunnel under the periosteum during surgery, typically orthopaedic, including use on the ribs. It may in addition be used in dentistry to access retained roots, or to remove them with surrounding bone. It is typically a one-piece instrument available in a variety of sizes and blade designs, including straight and curved blades, and often double-ended with a central handle; it is made of metal [e.g., stainless steel, titanium (Ti)]. This is a single-use device.