| abstract |
The invention relates to a unit (1) for mixing and supplying injectable substances, comprising a plurality of chambers (2, 2a, 2b, 2c) with different cross-sections, which are disposed consecutively from smallest (2) to biggest (2a, 2b, 2c) in an axial direction from the injection end (1a) and which contain the injectable substances (10a, 10b, 10c, 10d) that are mixed (10) when the chambers are communicated following the reverse movement of separating means (5, 5a) and a piston (4) which are moved by a coaxial rod (3) that is disposed in the unit. The separating means and the piston are moved during the use of the mixing unit by means of the compression and decompression of inert gases housed inside each of the compartments or chambers containing the injectable substances. According to the invention, both the injection end (1a) and the control end (1d) are equipped with respective covers (9, 6). The central conduit in the elastomer cover at the control end (1d) is hermetically sealed by the portion of the rod (3) located therein. The invention also comprises other elements (6a, 7c) and clamp means (7, 3a) which prevent the rod (3) from moving until it is activated for operation. |