A device in a disc implant (2) for positioning between two vertebrae (3,3') in a spinal column, said disc implant (2) including two contacting elements (14,14') for contacting each one vertebra and an intermediate articulation device (15) includes at least one sealing element (13,13') for attachment to a peripheral part of one of the contacting elements for sealing between that element and an adjacent vertebra. The invention also concerns a disc implant.