These are subcutaneous cavity marking devices and methods. More particularly, upon insertion into a body, the cavity marking device and method enable one to determine the center, orientation, and periphery of the cavity by radiographic, mammographic, echogenic, or other non-invasive imaging techniques....http://www.google.se/patents/US20020107437?utm_source=gb-gplus-sharePatent US20020107437 - Subcutaneous cavity marking device and method
