Medicament dispenser

A dispensing system comprising:

• a housing;
• a fluid flow system in the housing comprising:
• a valve assembly comprising a fluid inlet, a vent inlet and a fluid outlet,
• a cannula in fluidic communication with the vent inlet,
• a sheath surrounding the cannula and providing a fluid path between the cannula and the sheath, the sheath in fluid communication with the fluid inlet and the fluid outlet,
• a piston-cylinder assembly comprising a cylinder and a piston movable within the cylinder configured to draw a liquid from a container through the fluid path and dispense the liquid via a dispensing valve;
• an actuator assembly for actuating the piston-cylinder assembly comprising:
• a first actuator and a second actuator, wherein movement of the first actuator between a first position and a second position moves the piston in the cylinder to draw a liquid from a container through the fluid path, stores a biasing energy and allows the second actuator to move from a first position to a second position, and movement of the second actuator from the second positon to the first position releases the stored biasing energy to move the piston in the cylinder to dispense liquid via the dispensing valve.

A dispensing device, comprising:

• a piston-cylinder assembly comprising a cylinder and a piston movable within the cylinder,
• a fluidic system fluidically coupled to the piston-cylinder assembly, the fluidic system comprising a valve assembly, the valve assembly comprising:
• a cannula having a piercing distal end;
• a proximal end separated by a length;
• and at least one side port in proximity to the piercing distal end;
• and the at least one side port fluidically coupled to a vent;
• a one-way valve fluidically coupled to the vent;
• a sheath surrounding the length of cannula, the sheath having a distal end;
• a proximal end;
• at least one side opening;
• and a fluid path between the at least one side opening and a portion of the length of the cannula;
• a one-way valve fluidically coupled to the flow path;
• an outlet in fluid communication with the cylinder and the flow path;
• the piston configured to draw an amount of liquid through the valve assembly into the cylinder, and to expel the amount of liquid;
• and
• an actuator assembly operatively coupled to the piston comprising:
• a first actuator and a second actuator, wherein movement of the first actuator between a first position and a second position moves the piston in the cylinder to draw a liquid from a container through the fluid path, stores a biasing energy and allows the second actuator to move from a first position to a second position, and movement of the second actuator from the second positon to the first position releases the stored biasing energy to move the piston in the cylinder to dispense liquid via the dispensing valve.