Luer connection as a joint system for ducts in the medical field, in particular for fluid, vacuum and compressed air ducts, with a first male joint element, which has a distal connection area, and a second female joint element ( 1), which has a distal reception area (2), the connection area being able to fit into the reception area (2) so that a strong bond is formed between the male joint element and the female union element (1 ), in which the connection area has a coding clamp (3) and the receiving area (2) has a coding surface (4) corresponding to the coding clamp (3), presenting the coding clamp (3 ) on its inner side (5) at least one coding element (6) configured as a rib, so that the coding surface (4) is formed by grooves (10), so that the rib (6) is pressed, in the connected state, about the surface of the receiving area (2) so that the female connecting element (1) is attached, on the inner side, with the male connecting element and, on the outer side, with the coding clamp (3), characterized in that the slots (10) are configured so that they narrow in the end zone.Conexión Luer como sistema de unión para conductos en el ámbito médico, en particular, para conductos de fluido, vacío y aire comprimido, con un primer elemento de unión macho, que presenta un área de conexión distal, y un segundo elemento de unión hembra (1), que presenta un área de recepción (2) distal, pudiendo encajarse el área de conexión en el área de recepción (2) de modo que se forme una unión resistente entre el elemento de unión macho y el elemento de unión hembra (1), en la que el área de conexión presenta una abrazadera de codificación (3) y el área de recepción (2) presenta una superficie de codificación (4) correspondiente a la abrazadera de codificación (3), presentando la abrazadera de codificación (3) en su lado interior (5) al menos un elemento de codificación (6) configurado como nervadura, de modo que la superficie de codificación (4) se forma mediante ranuras (10), de manera
