The document specifies a connector assembly to be used to connect implantable pacemaker leads to implantable pulse generators. Essential dimensions and performance requirements are specified, together with appropriate test methods. However, the document does not address all aspects of the functional compatibility and reliability of different leads and pulse generators assembled into a pacemaker system: in particular, the document does not specify certain essential features, such as the means of fastening the connector assembly, or the materials of construction.#,,#