If an emergency arises where an unapproved medical device may offer the only possible life-saving alternative, but an Investigational Device Exemption (IDE) for the device does not exist, or the proposed use is not approved under an existing IDE, a physician may use the device if each of the following conditions exist: 1) the patient is in a life-threatening condition requiring immediate treatment; 2) no generally acceptable alternative is available; and 3) there is no time to use existing procedures to get FDA approval for the use. This is discussed in greater detail in Policy and Procedure on Emergency Use of an Unapproved Medical Device