The present invention generally relates to a mixing nozzle (12) for mixing at least two liquid compositions such as a first liquid composition and a second liquid composition. The mixing nozzle (10) is configured to be coupled to a body (11) of a multi-component application device (10), in particular to a body (11) of a two-component syringe assembly, for injection of a liquid composition, which body (11) is configured to separately store said at least two solutions. The present invention further relates to a multi-component application device (10) comprising said mixing nozzle (12) and to a kit comprising said mixing nozzle (12) or said application device (10). Furthermore, the present invention relates to a method using said application device or said kit, for example for replacing or filling a biological tissue or increasing the volume of a biological tissue.
