Devices for attaching a sheet-like implant to a target tissue include a sheath and a staple push rod. The heat spreadingtemperature uniformity device is applicable to the bake oven, including at least one rack body movably disposed in a receiving space defined by the bake oven, and multiple heat spreading members distributed over and arranged on the rack body and integrally connected therewith. First, at least one image simulation model is established according to the mask pattern and a process reference set used for fabricating the device based on the mask pattern.