the shape of a truncated cone with a taper of 6 capable of receiving a standard cap fitted with a needle a throat is provided at the periphery of the insert to permit the flow of the injection liquid and to obviate the need for a large dead volume application_number US 67386091 A description fig1 shows a device 10 for liquid transfer essentially comprising a receptacle 11 containing for example a liquid to be transferred into another receptacle holding a liquid or solid substance such as for example a lyophilisate said other substance may be in a vessel or holder stoppered by a membrane to be pierced by a trocar 12 which comprises the tip associated with the transfer device said transfer device further comprises a piston 13 attached to the end of a shaft 14 attached for example by ultrasonic soldering or any other appropriate means to the base of a capsule 15 having at its free end a tubular ferrule 16 with the said trocar 12 inside a membrane filter 17 is mounted between the base of capsule 15 and shaft 14 the latter is hollow and has a pipe 18 generally cylindrical and equipped with an axial peripheral groove 19 forming with the interior wall of shaft 14 a longitudinal channel to allow liquid to flow through said shaft towards filter 17 tubular ferrule 16 tubular end part 16 comprises a central cavity 20 defined by a truncated interior wall 21 extending at its end adjacent the base of capsule 15 into an annular cylindrical wall 22 truncated wall 21 has generatrices which converge towards the transfer device exterior wall 23 of tubular ferrule 16 is also truncated but its generatrices diverge towards the.