A connector (1) for infusion medical lines, transfusion lines, and the like, comprising a tubular body (2) having at one end a male connector (8) that includes an internal tubular element (9) and an external hollow element (10), which is internally threaded and can be screwed onto a complementary female connector, and additionally includes an external maneuver sleeve (22) coupled in unidirectional rotation to the body (2) of the connector (1) in the corresponding direction upon screwing said male connector (8) with respect to said complementary female connector, said connector (1) is characterized in that: - said tubular body (2) and said outer sleeve (22) are mutually axially movable between a first position in the which are coupled together in unidirectional rotation in said screwed direction of said male connector (8) while said external maneuver sleeve (22) is free to rotate in the direction opposite which corresponds to the unscrewing of said male connector (8), and a second position in which the mutually torsional coupling means (28, 29) are rotatably coupled to said sleeve (22) and said tubular body (2) in said direction corresponding to the unscrewing of said male connector (8), - said outer sleeve (22) is formed by two radial semi-shells (23, 24) coupled together in said body (2) of the connector (1) and each of the which is formed integrally with a suspended appendix (30) that tends to keep said outer sleeve (22) and said body (2) normally in said first position.Un conector (1) para líneas médicas de infusión, líneas de transfusión, y similares, que comprende un cuerpo tubular (2) teniendo en un extremo un conector macho (8) que incluye un elemento tubular interno (9) y un elemento hueco externo (10), el cual está roscado internamente y puede acoplarse mediante enroscado a un conector hembra complementario ,y adicionalmente incluye un manguito externo de maniobras (22) acoplado en rotación unidireccional al cuerpo (2) del conector (1) en la dirección que c
