Abstract: My proposed device is a fillable, detachable sac, which is intended to be placed with standard endoscopic or minimally invasive surgical techniques into bone cavities in Orthopedic Surgical practice. The “Sac” may be made of either permanent or dissolvable materials and is to be filled with bone cement, bone graft, antibiotic, or other pharmacologic materials as the particular pathology may dictate. Normally the “sac” or sack, will be introduced via an endoscopic cannula, and then, after filling, detached.