Nanomachines have many uses within the medical field. Often, they simply administer drugs, clean out garbage, or provide scaffolding for cellular regeneration efforts. Once their task is complete, these simple machines will then find their way into the body's natural waste disposal systems and deactivate. More advanced uses often focus on replacing or augmenting biological systems, such as acting as a superior white blood cell to hunt garbage, pathogens, and toxic compounds and can remain within the body for extended periods of time, simply siphoning off some of the body's nutrients to provide energy and materials.