Device for preparing and/or treating a biological sample

A device for preparation, treatment and/or analysis of at least one liquid, optionally a biological sample, comprising:

• a reaction support (3), comprising
• a reaction element comprising
• a set of at least two chambers comprising a first chamber (5) and a second chamber (6), the set further comprising:
• at least one central channel (7) comprising:
• an internal pipe (8) operable to allow the chambers (5 and 6) to be linked to one another in fluidic communication so as to constitute a set of adjacent chambers, and
• an external pipe (9) operable to link the internal pipe (8), by fluidic communication, to the exterior, and
• at least one emerging upstream channel (10) situated upstream of the first chamber (5) and at least one emerging downstream channel (11) situated downstream of the second chamber (6), each operable to link the respective chamber, by fluidic communication, to the exterior, and
• a drawer (4), which is movable in translation relative to the reaction support (3), between at least two translatory positions (P1 and P2), and having, for each position, at least a first control element (12), a second control element (22) and a third control element (32) operable to cooperate to close and/or to open the emerging upstream channel (10), external pipe (9) and downstream channel (11), respectively, in order to bring the internal volume of the chambers into (open control element) or out of (closed control element) fluidic communication with the exterior of the device,
• wherein the channels cooperate with the control elements borne by the drawer (4):
• a first control element (12) operable and aligned to cooperate with the emerging upstream channel (10), a second control element (22) operable and aligned to cooperate with the external pipe (9), and a third control element (32) operable and aligned to cooperate with the emerging downstream channel (11), and
• wherein each control element (12, 22 and 32) of the drawer (4) comprises a seal configured to cooperate with a contact surface (13) of the reaction support (3) at each translatory position.