| 摘要 |
PCT No. PCT/SE94/00585 Sec. 371 Date Feb. 21, 1996 Sec. 102(e) Date Feb. 21, 1996 PCT Filed Jun. 14, 1994 PCT Pub. No. WO95/00193 PCT Pub. Date Jan. 5, 1995An apparatus for a controlled delivery of a liquid preparation from a cylindrical liquid container, which has a liquid outlet at its front end and a movable wall, which acts like a piston at its rear end is provided. The driving force acting on the movable wall for expelling the liquid from the container is generated by means of a piston rod in connection with a piston, which by the action of the atmospheric pressure is urged into a space where a vacuum has been established. The amount delivered can be varied according to different modes by providing an auxiliary force which acts on the piston during the initial stage of its movement into the vacuum space. |
