The invention provides systems and methods for tissue expansion. A tissue expander may have an implant portion which may be used to expand the tissue. A delivery/drainage system may be also be provided, which may be in fluid communication with a pocket surrounding the tissue expander. Various port configurations may be provided that may provide access to the implant portion and/or the delivery/drainage system. The tissue expander may advantageously help prevent or treat infection, or check the state of the pocket surrounding the tissue expander.
