Abstract: A potentiometer-controlled electromechanic system to eject fluids by squeezing flexible plastic containers. The system comprises an electromechanic driving set, including an electric motor-driven shaft with a worm gear engaged to rack gear sections of arms attached to a movable presser plate, that squeeze a fluid-containing flexible plastic bag inserted in a cavity formed at the front portion of the device housing. The cavity is formed by a movable presser plate and a fixed clear and transparent front plate, bent at its sides. The fluid ejection parameters are controlled by an electronic set comprising a precision potentiometer attached to the motor-driven shaft, linked to a microprocessor-based electronic circuitry and a programming set formed by a series of buttons for entering the required ejection parameters, such as fluid flow rate, pressure, ejected volume, etc. The parameters are visualized in a liquid-crystal display.

Abstract: The present invention refers to an easy to use and more cost effective medication injector. The injector comprises a fluid container (1) made, preferably, of one bent, or two straight, edge heat-sealed neutral, flexible, pressure resistant and autoclavable plastic films, containing, at the discharge side, a rigid plastic tube (2) with reinforcement wings (3), in whose distal end is attached a needle (4), tightly enclosed in a plastic tube (5), closed at its distal end (6), the set being enclosed in an air-tight envelope (7) with rims (8). For large volumes infusion, the container (1) is attached to an infusion tubing (9) with a simple drip chamber (40) and an optional clamp (11) and a three-way stopcock (41) adapted to connect a syringe (42) for an initial bolus in a biphasic administration. For large volumes pressure injections, the container (1) is placed between pressing plates (14and 17) respectively attached to a lower (13) and upper (15) elements, both connected by the main link (16).