Implantable medical device, the implantable medical device including an implantable supply unit and an implantable medical unit, the implantable supply unit including: a. a hermetically sealed supply unit housing; b. a battery; c. a supply unit power coupler, the supply unit power coupler being configured for powering the implantable medical unit from the battery by way of non-galvanic coupling; d. a supply unit data coupler, the supply unit data coupler being configured for non-galvanic data communication with the medical unit; e. a supply unit communication interface, the supply unit communication interface being configured for non-galvanic communication with a non-implanted remote device; f. a supply unit coupling arrangement (212, 213), the supply unit coupling arrangement (212, 213) being configured for releasable mechanical coupling the medical unit to the supply unit, wherein the battery, the supply unit power coupler, the supply unit data coupler and the supply unit communication interface are enclosed by the supply unit housing, the medical unit including: a. a hermetically sealed medical unit housing; b. a functional medical module (32, 32a), wherein the functional medical module (32, 32a) is or includes a continuous glucose meter module; c. a medical unit power coupler, the medical unit power coupler being configured to receive power from the supply unit power coupler by way of non-galvanic coupling, thereby powering the medical unit; d. a medical unit data coupler, the medical unit data coupler being configured for non-galvanic data communication with the supply unit; e. a medical unit coupling arrangement, the medical unit coupling arrangement being configured as counter element for the supply unit coupling arrangement (212, 213). the implantable supply unit including: a. a hermetically sealed supply unit housing; b. a battery; c. a supply unit power coupler, the supply unit power coupler being configured for powering the implantable medical unit from the battery by way of non-galvanic coupling; d. a supply unit data coupler, the supply unit data coupler being configured for non-galvanic data communication with the medical unit; e. a supply unit communication interface, the supply unit communication interface being configured for non-galvanic communication with a non-implanted remote device; f. a supply unit coupling arrangement (212, 213), the supply unit coupling arrangement (212, 213) being configured for releasable mechanical coupling the medical unit to the supply unit, a. a hermetically sealed supply unit housing; b. a battery; c. a supply unit power coupler, the supply unit power coupler being configured for powering the implantable medical unit from the battery by way of non-galvanic coupling; d. a supply unit data coupler, the supply unit data coupler being configured for non-galvanic data communication with the medical unit; e. a supply unit communication interface, the supply unit communication interface being configured for non-galvanic communication with a non-implanted remote device; f. a supply unit coupling arrangement (212, 213), the supply unit coupling arrangement (212, 213) being configured for releasable mechanical coupling the medical unit to the supply unit, wherein the battery, the supply unit power coupler, the supply unit data coupler and the supply unit communication interface are enclosed by the supply unit housing, the medical unit including: a. a hermetically sealed medical unit housing; b. a functional medical module (32, 32a), wherein the functional medical module (32, 32a) is or includes a continuous glucose meter module; c. a medical unit power coupler, the medical unit power coupler being configured to receive power from the supply unit power coupler by way of non-galvanic coupling, thereby powering the medical unit; d. a medical unit data coupler, the medical unit data coupler being configured for non-galvanic data communication with the supply unit; e. a medical unit coupling arrangement, the medical unit coupling arrangement being configured as counter element for the supply unit coupling arrangement (212, 213). a. a hermetically sealed medical unit housing; b. a functional medical module (32, 32a), wherein the functional medical module (32, 32a) is or includes a continuous glucose meter module; c. a medical unit power coupler, the medical unit power coupler being configured to receive power from the supply unit power coupler by way of non-galvanic coupling, thereby powering the medical unit; d. a medical unit data coupler, the medical unit data coupler being configured for non-galvanic data communication with the supply unit; e. a medical unit coupling arrangement, the medical unit coupling arrangement being configured as counter element for the supply unit coupling arrangement (212, 213).