Patent ID: 7303728

Claim:
Fluid dispensing device characterized in that it comprises: a dispensing member ( 10 ) comprising: a duct ( 42 , 44 ) for the passage of a transporter liquid ( 52 ), a valve ( 48 ) fixed to one of the ends ( 38 ) of the said duct, a passive dispensing needle ( 12 ) arranged at the other end ( 38 ), and means ( 46 ) of measuring the rate of flow of the transporter liquid ( 52 ) in the duct, inserted between said valve and said needle; a sealed container ( 50 ) containing the transporter liquid ( 52 ) and connected to the valve ( 48 ) by a tube, a pump ( 54 ) of the intake and delivery type, in communication with the container ( 50 ) and serving to place the latter at a raised pressure or at a reduced pressure so as to cause the transporter liquid ( 52 ) to flow through the said duct ( 42 , 44 ) in one direction or the other, and electronic means ( 58 , 60 ) responding to the said measurement means ( 46 ) and acting both on the said valve ( 48 ) and on the said pump ( 54 ) so as to cause a determined amount of fluid ( 30 ) to be drawn up into the needle ( 12 ) to be dispensed, means ( 60 ) of calculating the amount of fluid drawn into or delivered through the needle, on the basis of the information supplied by the flow measurement means, and a control circuit ( 58 ) placed under the command of the said calculating means ( 60 ) and mainly performing the functions of controlling the pump ( 54 ) to place the said container ( 50 ) at a raised pressure or at a reduced pressure and of commanding the opening and closing of the valve ( 48 ) so as to allow or disallow the displacement of a determined amount of transport liquid ( 52 ) in one direction or the other, said displacement causing a determined amount of fluid ( 30 ) to be drawn into said needle ( 12 ) to be dispensed.