A device for injecting a high viscosity material having a viscosity greater than 100 Pa*s into a cannula, the device comprising: a container being non-compliant and having an inlet at one end and an outlet at an opposed other end, the outlet being in fluid communication with the cannula, the container receiving the high viscosity material therein prior to transfer into the cannula, the high viscosity material in the container having a viscosity of at least 100 Pa*s; a pressure applicator in fluid communication with the container, the pressure applicator defining a fluid flow path through which an incompressible fluid is displaceable; characterized in that: a material-moving member comprises a membrane which interrupts the fluid flow path between the inlet and the outlet of the container and separates the incompressible fluid, having a viscosity of less than 100 Pa*s, from the high viscosity material, which has a viscosity substantially corresponding to that of water or saline solution, the membrane defining within the container an incompressible fluid receiving portion on one side thereof which is in communication with the inlet and the fluid flow path of the pressure applicator and a high viscosity material receiving portion on an opposed side which is in communication with the outlet of the container, the membrane being displaceable by a pressure of the incompressible fluid acting thereagainst to force the high viscosity material out of the high viscosity material receiving portion of the container and into the cannula. a container being non-compliant and having an inlet at one end and an outlet at an opposed other end, the outlet being in fluid communication with the cannula, the container receiving the high viscosity material therein prior to transfer into the cannula, the high viscosity material in the container having a viscosity of at least 100 Pa*s; a pressure applicator in fluid communication with the container, the pressure applicator defining a fluid flow path through which an incompressible fluid is displaceable; characterized in that: a material-moving member comprises a membrane which interrupts the fluid flow path between the inlet and the outlet of the container and separates the incompressible fluid, having a viscosity of less than 100 Pa*s, from the high viscosity material, which has a viscosity substantially corresponding to that of water or saline solution, the membrane defining within the container an incompressible fluid receiving portion on one side thereof which is in communication with the inlet and the fluid flow path of the pressure applicator and a high viscosity material receiving portion on an opposed side which is in communication with the outlet of the container, the membrane being displaceable by a pressure of the incompressible fluid acting thereagainst to force the high viscosity material out of the high viscosity material receiving portion of the container and into the cannula. a material-moving member comprises a membrane which interrupts the fluid flow path between the inlet and the outlet of the container and separates the incompressible fluid, having a viscosity of less than 100 Pa*s, from the high viscosity material, which has a viscosity substantially corresponding to that of water or saline solution, the membrane defining within the container an incompressible fluid receiving portion on one side thereof which is in communication with the inlet and the fluid flow path of the pressure applicator and a high viscosity material receiving portion on an opposed side which is in communication with the outlet of the container, the membrane being displaceable by a pressure of the incompressible fluid acting thereagainst to force the high viscosity material out of the high viscosity material receiving portion of the container and into the cannula.