Filling apparatus for fluid media

Claim 1

A dispensing apparatus for dispensing a fluid medium in which parts of the apparatus used in dispensing the fluid may be cleaned and sterilized without removal of the parts and the parts are always sterile during dispensing doses which comprises: a fixed frame; a fixed cylinder secured at one end to said fixed frame and forming a first sterile chamber; an axially movable shaft in coaxial relationship with said fixed cylinder; a dispensing cylinder in axial alignment with said fixed cylinder and mounted with one end axially movable within said fixed cylinder; said dispensing cylinder including a dosage dispensing chamber and a second sterile chamber in axial alignment; said first and second sterile chambers being in axial alignment and on opposite sides of said dosage dispensing chamber; a dispensing piston in coaxial alignment with said dispensing cylinder and in axial alignment with said axially movable shaft for axial movement in said dispensing chamber and said first sterile chamber; means on said axially movable shaft for securing one end of said dispensing piston to said axially movable shaft; a first inlet in said dispensing cylinder; a first outlet in said dispensing cylinder in direct opposition to said first inlet; a rotary valve in said dispensing cylinder in coaxial relationship therewith in axial relationship with said dispensing piston and in radial alignment with said first inlet and said first outlet; means for rotating said rotary valve to close and open said first inlet and said first outlet; a second inlet and a second outlet connected with said second sterile chamber in said dispensing cylinder; a third inlet and a third outlet connected to said first sterile chamber in said fixed cylinder; whereby fluids may be dispensed with said dispensing cylinder in one position and said dispensing elements may be cleaned and sterilized when said dispensing cylinder is moved to a second position relative to said first sterile chamber in said fixed cylinder.