The invention relates to a permanent percutaneous electric connection device intended to be fixed in an osseous structure of a patient to electrically connect an internal entity (150) located inside the body of the patient to an entity external to said body. The device encloses electric connection means running from a first connector to be connected to the external entity to a second connector to be connected to the internal entity. The device has an extension member (120) extending from a socket of the first connector. The extension member is designed for full osseous burial into the osseous structure with its free end (121) being substantially flush with the surface of said osseous structure. The device also comprises an electric connection member (130) comprising the second connector securely fastened to the free end of the extension member (120).
