Injector (1) of a propellant combustion member, comprising - a first supply (31) - a second supply (41) the first supply (31) being connected to a plurality of supply ducts (33) arranged around it a longitudinal axis (ZZ), the second power supply (41) being configured to supply an injection chamber (5), said injection chamber (5) being connected to a plurality of supply sleeves (44). ) by means of injection ports (45), each supply stack (33) being surrounded by a coaxial feed sleeve (44), characterized in that the injector (1) further comprises a chamber sampling device (62) connected to a sampling duct (61) of the second propellant, said sampling chamber (62) being arranged so as to take from the second liquid propellant of the injection chamber (5), the injector (1) ) being configured so as to produce a homogeneous injection of the second propellant via the o injection ports (45).
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