Selected dose pharmaceutical dispenser

A liquid pharmaceutical dispenser comprising:

• a body having a body interior, a body proximal end and a body distal end;
• a pharmaceutical cartridge, mounted within the body towards the body distal end, including a hollow cylinder having a cartridge interior and a piston movably mounted within the cartridge interior, the piston and hollow cylinder defining a pharmaceutical chamber;
• a needle assembly mountable to the body distal end;
• means for selectively fluidly coupling the needle assembly to and fluidly sealing the needle assembly from the liquid pharmaceutical in the pharmaceutical chamber when in open and closed positions respectively;
• a stem having a distal end coupled to the piston and a proximal end and external stem threads;
• a user-rotatable dose adjuster, rotatably mounted within the body, including internal threads engaging the external stem threads so that rotation of the dose adjuster in a first rotary direction tends to drive the threaded stem in a distal direction towards the piston and the dose adjuster in a proximal direction away from the piston, the piston being substantially immovable in the distal direction when the pharmaceutical chamber is filled with a liquid pharmaceutical so that the dose adjuster is forced in the proximal direction;
• means for biasing the dose adjuster in the distal direction so that after the dose adjuster has been rotated in the first rotary direction and the dose adjuster has moved in the proximal direction against the force of the biasing means, upon placing the selectively fluidly coupling means in the open position the biasing means forces the dose adjuster and stem therewith in the distal direction thus causing the piston to move in the distal direction forcing at least a portion of the liquid pharmaceutical from the pharmaceutical and the needle assembly is fluidly sealed from the liquid pharmaceutical in the pharmaceutical chamber, through the selectively fluidly coupling means and to the needle assembly.

A selected dose, multiple liquid pharmaceutical dispenser comprising:

• a body;
• a needle assembly mountable to the body;
• hollow cylinders and an axially moveable piston within each cylinder, each piston and hollow cylinder defining a variable volume pharmaceutical chamber;
• a flow path coupling the pharmaceutical chambers to the needle assembly;
• a check valve associated with each of the pharmaceutical chambers and positioned along the flow path, the check valves configured to permit fluid flow from the pharmaceutical chambers into the flow path but to prevent fluid flow from the flow path into the pharmaceutical chambers;
• a user actuated delivery valve operably coupling the flow path and the needle assembly, the delivery valve preventing fluid flow from the flow path into the needle assembly when in a closed position and the delivery valve permitting fluid flow from the flow path into the needle assembly when in an open position;
• means for selecting a dose of each of the liquid pharmaceuticals to be delivered through the needle assembly;
• and
• means for automatically driving the pistons against the liquid pharmaceuticals within the pharmaceutical chambers, thereby reducing the volumes of the pharmaceutical chambers and driving the pistons distances corresponding to the selected doses, after the dose selecting step and upon switching the delivery valve from the closed position to the open position, whereby the dose of each liquid pharmaceutical is generally simultaneously delivered through the needle assembly.

A multiple pharmaceutical cartridge-type assembly comprising:

• hollow cylinders and an axially moveable piston within each cylinder, each piston and hollow cylinder defining a variable volume pharmaceutical chamber;
• a flow path element coupling the hollow cylinders to one another and fluidly coupling the pharmaceutical chambers to an outlet;
• a check valve associated with each of the pharmaceutical chambers and positioned along the flow path, the check valves configured to permit fluid flow from the pharmaceutical chambers into the flow path but to prevent fluid flow from the flow path into the pharmaceutical chambers;
• and
• a user actuated delivery valve operably coupling the flow path and the outlet, the delivery valve preventing fluid flow from the flow path into the outlet when in a closed position and the delivery valve permitting fluid flow from the flow path into the outlet when in an open position.