A fluid delivery device comprising:
- a fluid-filled cartridge comprising an outlet;
- a fluid container comprising a substantially cylindrical barrel having an open end and a fluid dispensing end;
- a plunger rod configured to be received within the open end of the cylindrical barrel and comprising a first end and a second end, wherein the second end extends out of the open end of the cylindrical barrel, the plunger rod dividing the cylindrical barrel into a first chamber between a first end of the plunger rod and the fluid dispensing end of the cylindrical barrel and a second chamber;
- an intermediate sealing member in sealing engagement with an inner wall of the cylindrical barrel, the intermediate sealing member positioned between the first end and the second end of the plunger rod to form the second chamber;
- a connection mechanism extending from and positioned within the second end of the plunger rod and comprising a fluid path extending from a first end of the connection mechanism to a second end of the connection mechanism;
- a fluid channel formed in the plunger rod extending from the second end of the connection mechanism to the first end of the plunger rod;
- a compressible member extending from the outlet of the fluid-filled cartridge to the second end of the plunger rod and surrounding the connection mechanism;
- a removable retention mechanism positioned between the outlet of the fluid-filled cartridge and the second end of the plunger rod over the compressible member to prevent the outlet of the fluid-filled cartridge from contacting the connection mechanism, the removable retention mechanism in contact with both the outlet of the fluid-filled cartridge and the second end of the plunger rod prior to removal;
- and
- an actuator having a first state in which fluid is prevented from flowing through the fluid dispensing end of the cylindrical barrel and a second state that allows the fluid to flow through the fluid dispensing end of the cylindrical barrel,
- wherein the fluid is transferred from the fluid-filled cartridge to the fluid container by removing the removable retention mechanism and compressing the compressible member such that the outlet of the fluid-filled cartridge is connected to the connection mechanism, thereby putting the fluid-filled cartridge in fluid communication with the fluid path extending from the first end of the connection mechanism to the second end of the connection mechanism, and
- wherein the fluid is dispensed by forming a vacuum within the second chamber by enlarging a volume of the second chamber by pulling the second end of the plunger rod away from the open end of the cylindrical barrel, thereby drawing the fluid from the fluid-filled cartridge through the fluid path of the connection mechanism, through the fluid channel of the plunger rod, and into the first chamber, and switching the actuator from the first state in which the fluid is prevented from flowing through the fluid dispensing end of the cylindrical barrel to the second state causing the plunger rod to move towards the fluid dispensing end of the cylindrical barrel forcing fluid from the first chamber through the fluid dispensing end of the cylindrical barrel.