An exoscalpel was used during the surgery to replace Lieutenant Worf's spinal column in 2368. (TNG: "Ethics" ) The exoscalpel was a standard medical tool aboard the USS Prometheus in 2374. (VOY: "Message in a Bottle") Exoscalpels have been seen in a wide variety of sizes and configurations. The exoscalpel prop depicted has been used in a variety of different applications, such as that of a scanner device in TNG: "The Host" .