A penetrator assembly operable to provide access to a bone marrow is provided. The penetrator assembly may include an outer penetrator and a removable inner trocar operable to penetrate bone and bone marrow. The removable inner trocar may include a groove operable to receive a portion of the bone and bone marrow when the outer penetrator and the removable inner trocar penetrate the bone and bone marrow. The removable inner trocar may include a receptacle operable to receive a portion of a connector operable to releasably attach the penetrator assembly to a powered apparatus, and a release mechanism disposed within the receptacle and operable to engage the portion of the connector.
