Method and set for transferring a fluid between two containers

A method for transferring a fluid between a first container (1) containing a fluid and a second container (2), said first container (1) being connected to a first end (4) of a first transfer body (3), a first sealing member (9) preventing the fluid communication between said first container (1) and said first transfer body (3), said second container (2) being closed by a second sealing member, characterized in that it includes the following successive steps:

• a) of assembling said second container (2) to a fastening member (14) provided at a first end of a second transfer body (13), said second transfer body (13) being into an inactivated position of the transfer set wherein at least a part (19, 45) of said second transfer body (13) is partially inserted within the second end of said first transfer body (3), each of said transfer bodies (3, 13) further comprising a central passage (6, 15) to accommodate at least one of the ends of a mobile piercing member (8), said passages (6, 15) being coaxial, the central passage (15) of said second transfer body (13) opening into said fastening member (14) to allow the end of said piercing member (8) to pass towards the second sealing member, the end of said piercing member (8) being provided apart from said second sealing member so that said sealing members are non-bored after this assembly,
• b) said part (19, 45) of the second transfer body (13) being movable along a moving axis (21) from said inactivated position to an activated position of the transfer set wherein the fluid communication between the first container (1) and said second container (2) is established, of moving said part (19, 45) along said moving axis (21) up to said activated position, the only displacement of said part (19, 45) involving first the piercing of the second sealing member and then the piercing of the first sealing member (9) by said mobile piercing member (8) comprising a boring element on each of its ends,
• c) of introducing at least a part of the fluid from said first container (1) into said second container (2) in order to mix it with the contents of said second container.