The document discusses the potential of nanomedical devices for diagnosis and treatment. It provides examples of nanoshells, dendrimers, fullerenes, nanocrystals, nanowires, and nanopores and their medical applications such as photothermal tumor ablation using nanoshells, DNA sequencing using nanopores, and use of nanowires as molecular sensors and for brain studies. It also notes potential health risks from nanoparticles and their presence in consumer products.