The invention relates to a connection device for connecting an implant system anchored in bone with an external prosthesis component, such as a limb prosthesis, prosthetic knee elbow or finger. The connection device includes a main housing, a first attachment portion arranged for attachment to the implant system and a second attachment portion arranged for attachment to the prosthesis component. It further includes a safety mechanism to protect the implant system from high mechanical forces, including rotational forces and or bending forces. According to one aspect of the invention the safety mechanism includes a rotational force release mechanism. This includes a first component including a ring unit having an inner surface with at least one depression and a second component includes at least one plunge unit urged into contact with said the depression by said spring means. According to another aspect the safety mechanism includes a bending force release mechanism with the second attachment portion being pivotable and having a spring loaded cam unit acting on a cam surface of the main hosing. According to a further aspect the safety mechanism is arranged to limit rotating forces as well as bending forces.Linvention concerne un dispositif de liaison pour relier un système dimplant, ancré dans un os, avec un composant de prothèse externe, tel quune prothèse de membre, un genou, un coude ou un doigt prothétique. Le dispositif de liaison comprend un boîtier principal, une première partie de fixation conçue pour être fixée au système dimplant et une seconde partie de fixation conçue pour être fixée au composant de prothèse. Ledit dispositif comprend en outre un mécanisme de sécurité pour protéger le système dimplant contre des forces mécaniques élevées, comprenant des forces de rotation et/ou des forces de pliage. Selon un aspect de linvention, le mécanisme de sécurité comprend un mécanisme de libération de force de rotation. Celui-ci comprend un premier composant compre
