Device for the controlled supply of a liquid to a medical flow line

Device for the controlled supply of a medical liquid, including a tubular inlet connector and a tubular outlet connector defining a flow line of a primary fluid and an intermediate tubular transverse connector arranged therebetween for introducing into said flow line a secondary liquid contained within a bottle having a pierceable cap, wherein said intermediate connector comprises an annular stationary base on which a hollow retaining body, into which said bottle is to be fitted, is rotatably arranged coaxially with said intermediate connector, said retaining body:

• a hollow axial spike designed to pierce said pierceable cap when said bottle is fitted into said retaining body, said hollow spike having at least one inner flow passage,
• rotation blocking means of the retaining body relative to said base in a first angular position, said blocking means being disengageable by said bottle as a result of insertion thereof into said retaining body,
• stop means for axially retaining said bottle relative to said retaining body, said stop means activated following rotation of said retaining body starting from said first angular position, and
• progressive opening means of said flow passage of said hollow piercing spike towards said intermediate connector during the rotation of said retaining body from said first angular position, in which communication between said flow passage and said intermediate connector is completely closed, towards a second angular position in which such communication is completely open.