Patent ID: 6902543

Claim:
A syringe type device actuated by a piston and intended to reconstitute a preparation, in solution, in suspension or in dispersion in a liquid, comprising: a cartridge constituting the proximal reservoir ( 13 ) containing the non-liquid part ( 14 ) of the preparation, said cartridge ( 13 ) forming part of the body of said syringe and being sealed at one end by a fixed element ( 27 ) and at the other end by a piston ( 29 ); a cartridge constituting a distal reservoir ( 11 ) containing liquid part ( 12 ) of the preparation, said cartridge forming an injection rod of the piston of the syringe; a hollow transfer element ( 18 ) located between the two cartridges ( 11 , 13 ); and an injection needle ( 20 ); wherein these elements are all arranged inside a plastic body and there is no physical link between the two said reservoirs ( 11 , 13 ), said device being characterized in that: a) said cartridge constituting the proximal reservoir ( 13 ) containing the non-liquid part ( 14 ) of the preparation is under vacuum; b) said cartridge constituting the proximal reservoir ( 13 ) is directly in contact with the outlet of the injection needle ( 20 ); c) said piston ( 29 ) is prevented from being pushed in by a locking mechanism ( 16 ) on said reservoir ( 13 ), said locking mechanism ( 16 ) being able to be deactivated; d) said cartridges being designed so that the cartridge constituting the distal reservoir ( 11 ) containing the liquid part ( 12 ) can penetrate into the interior of the body of the syringe, and, provided the locking mechanism ( 16 ) is unlocked, into the interior of the cartridge constituting the proximal reservoir ( 13 ) containing the non-liquid part ( 14 ) of the preparation; and e) the device includes a mechanism by which, after entry into said piston ( 29 ), said hollow transfer element ( 18 ) is withdrawn before the injection and the tightness of the cartridge constituting the proximal reservoir ( 13 ) is thereby restored.