At my school we have three tracks, the descriptions are below, if you are interested in developing artificial organs I believe you are looking at cell and tissue engineering.
Biopharmaceutical engineering: Encompasses biochemistry and chemical engineering. Representative topics relevant to this track include genomics, recombinant DNA, protein engineering, bioprocessing, drug synthesis and delivery
Bioelectronics/biophotonics: Will appeal to students interested in applications of electrical engineering and physics in bioengineering. Representative topics include signal processing, biosensors, MEMs, biochips for DNA sequencing, laser and fiber based optical technology.
Cell and tissue engineering: Straddles the fields of molecular and cell biology, materials science, mechanical and electrical engineering. It encompasses biomaterials and biomechanics, from cells and tissue to organs and systems.
Lehigh University | Bioengineering Program