An inflatable, expandable implant suitable for implantation in a human body, comprising a bladder having a bladder wall defining a volume, having at least one bladder wall opening for introduction of filler material, and the bladder having no passageway through the bladder wall for passage of a body fluid from an end of the bladder to another end of the bladder, and at least one closure for each of the at least one bladder wall openings for maintaining the filler material within the volume after introduction of the filler material into the volume.