System and method for filling a closed container with a fixative solution

System (400) for filling a closed container (200) with a fixative solution, comprising:

• a container (200) comprising a container body (230) for receiving a biological specimen, a lid (220) for selectively closing the container body (230) and a port (100) forming a unidirectional barrier in a direction from the inside (IC) to the outside (OC) of the closed container (200);
• a dispensing apparatus (500) having a filling nozzle (300) for dispensing the fixative solution;
• wherein the filling nozzle (300) is relatively moveable with respect to the container (200) between a retracted position to be outside the container (200) and a filling position to enter the inside (IC) of the container (200) with the filling nozzle (300) through the port (100) to fill the container (200) with the fixative solution;
• wherein the port (100) and the filling nozzle (300) are configured in relation with each other such that the unidirectional barrier is maintained when the filling nozzle (300) is in its filling position;
• wherein in the filling position the filling nozzle (300) penetrates the port (100), wherein the dispensing apparatus (500) further comprises a moving unit (540), wherein the moving unit (540) moves the filling nozzle (300) and the container (200) relative to each other;
• and
• wherein the dispensing apparatus (500) further comprises a weighing unit (550) for determining the weight of the closed container (200);
• and
• wherein the dispensing apparatus (500) further comprises a control unit (660) for controlling the dispensing apparatus (500), the filling nozzle (300), the moving unit (540) and the weighing unit (550), for controlling interactions between the respective elements,
• wherein the control unit (660) is configured to determine the amount of the fixative solution required for the biological specimen inside the closed container (200) based on weight and/or on dimensions of the biological specimen.