Device for temporarily connecting two containers

A method for obtaining connection a system including a first container and a second container, said connection system comprising a closing sleeve provided with a lower part permanently mounted on the first container to protect sterile interior of the closing sleeve, provided with an upper part which is suitable for allowing the mounting of the opening of the second container and provided with an integrated membrane, said membrane separating the upper part from the lower part of the closing sleeve, said membrane being suitable for being perforated by the second container when the latter is mounted on the upper part of the closing sleeve, characterised in that said method comprises the following steps:

• forming the closing sleeve and the lid by using a simultaneous method of moulding by injection of at least one plastic material,
• assembling the lid and the closing sleeve upon extraction of the lid and the closing sleeve from their respective moulds,
• forming a dispenser of the second container to be introduced in said second part of said closing sleeve to perforate said membrane and continue to advance until said dispenser is received inside an opening of a joining element inserted between the first container and said first part of said closing sleeve, wherein a second membrane is integrated between the closing sleeve and the joining element, and
• mounting the lid on the second part of the connection device in order to thus close off said second part of the closing sleeve, once the lid and the closing sleeve have exited their respective moulds.