Medical liquid injection device comprising the following distinct elements: a container (1), an outlet channel (14) and a pumping unit (5) said container (1) comprising a rigid wall on which said pumping unit (5) is rigidly fixed said rigid wall furthermore including a passage (4) which forms a direct fluid connection between said pumping unit (5) and said container (1) said outlet channel (14) being directly connected to said pumping unit (5) in such a way that a fluid initially kept in said container (1) may first flow through said pumping unit (5) and then reach said outlet channel (14), said medical liquid injection device furthermore comprising an inlet (16), distinct from said outlet channel (14), and disposable elements.
