Multipharmaceutical delivery system

A variable ratio multipharmaceutical delivery system comprising:

• first and second variable volume reservoirs containing first and second flowable materials;
• a variable volume accumulator chamber;
• means for permitting fluid flow from the first and second reservoirs into the variable volume accumulator chamber while preventing backflow;
• a flowable material delivery head;
• means for fluidly coupling the delivery head to the variable volume accumulator chamber;
• means for forcing first and second volumes of the first and second flowable materials from the first and second reservoirs, respectively, to the variable volume accumulator chamber via the fluid flow permitting means, so that the volume of the variable volume accumulator chamber increases by an amount equal to the first and second volumes combined, the first and second volumes of flowable materials forced into the variable volume accumulator chamber creates a flowable material mixture therein;
• and
• the permitting means including an elastomeric valve body having first and second normally closed slits, said slits having reservoir ends fluidly coupled to the first and second reservoirs respectively, and each of said slits having accumulator ends fluidly coupled to the variable volume accumulator chamber;
• means for maintaining the second slit closed when the reservoir end of the first slit is subjected to a fluid pressure sufficient to open the first slit to permit the pressurized flowable material to pass through the opened slit and into the variable volume accumulator chamber;
• and
• means for expulsing the flowable material mixture from the variable volume accumulator chamber through the delivery head via the fluidly coupling means.

A syringe comprising:

• first and second liquid reservoirs containing first and second liquids, each of said reservoirs having a length and first and second ends and a generally constant cross-sectional shape along at least a part of the length;
• first and second pistons mounted within the first and second reservoirs and movable towards the first ends thereof;
• an accumulator chamber having a length and first and second ends, at least part of the length of the accumulator chamber having a generally constant cross-sectional shape;
• an accumulator piston mounted within the accumulator chamber and movable along the length of the accumulator chamber;
• a flow path fluidly coupling the first ends of the first and second reservoirs to the accumulator chamber;
• a stem for selectively driving the first piston, the second piston and the accumulator piston towards the respective first ends of the first reservoir, the second reservoir and the accumulator chamber;
• means for preventing fluid flow from the accumulator chamber into either of the first and second reservoirs so that when the first piston is driven towards the first end of the first reservoir by the stem, liquid in the first reservoir flows into the accumulator chamber so to tend to force the accumulator piston towards the second end of the accumulator chamber;
• a hollow needle;
• and
• means for selectively fluidly coupling the accumulator chamber to the hollow needle so that when fluidly connected, any liquid in the accumulator chamber can be forced through the fluidly coupling means and to the hollow needle by driving the accumulator piston towards the first end of the accumulator chamber by the stem.

A variable ratio, liquid pharmaceutical dispensing system comprising:

• first and second pistons;
• an accumulator piston;
• first and second variable volume reservoirs containing first and second liquids, wherein the first and second variable volume reservoirs are elongate with generally constant cross-sectional shapes, and the first and second variable volume reservoirs are partially defined by the first and second pistons;
• a variable volume accumulator chamber, wherein the variable volume accumulator chamber is partially defined by the accumulator piston housed within the variable volume accumulator chamber;
• means for permitting fluid flow from the first and second reservoirs into the variable volume accumulator chamber while preventing backflow;
• a pharmaceutical delivery head;
• means, including a manually movable element movable by a user between open and closed positions, for permitting and blocking fluid flow from the variable volume accumulator chamber to the pharmaceutical delivery head when the movable element is in the open and closed positions respectively;
• means for forcing first and second volumes of the first and second liquids from the first and second reservoirs, respectively, to the variable volume accumulator chamber via the fluid flow permitting means, so that the volume of the variable volume accumulator chamber increases by an amount equal to the first and second volumes combined, and the first and second volumes of the first and second liquids creates a liquid mixture in the variable volume accumulator chamber;
• and
• means for expulsing the liquid mixture from the variable volume accumulator chamber through the pharmaceutical delivery head via the fluidly coupling means, the expulsing means including the accumulator piston.

A pharmaceutical delivery system comprising:

• first and second liquid reservoirs containing first and second liquids, each of said reservoirs having a length and first and second ends and a generally constant cross-sectional shape along at least a part of the length;
• first and second pistons mounted within the first and second reservoirs and movable towards the first ends thereof;
• an accumulator chamber having a length and first and second ends, at least part of the length of the accumulator chamber having a generally constant cross-sectional shape;
• an accumulator piston mounted within the accumulator chamber and movable along the length of the accumulator chamber;
• a flow path fluidly coupling the first ends of the first and second reservoirs to the accumulator chamber;
• a stem for selectively driving the first piston, the second piston and the accumulator piston towards the respective first ends of the first reservoir, the second reservoir and the accumulator chamber;
• means for preventing fluid flow from the accumulator chamber into either of the first and second reservoirs so that when the first piston is driven towards the first end of the first reservoir by the stem, liquid in the first reservoir flows into the accumulator chamber so to tend to force the accumulator piston towards the second end of the accumulator chamber;
• a pharmaceutical delivery head;
• and
• means for selectively fluidly coupling the accumulator chamber to the pharmaceutical delivery head so that when fluidly connected, any liquid in the accumulator chamber can be forced through the fluidly coupling means and to the pharmaceutical delivery head by driving the accumulator piston towards the first end of the accumulator chamber by the stem.

A variable ratio, liquid pharmaceutical dispensing syringe comprising:

• first and second pistons;
• an accumulator piston;
• first and second variable volume reservoirs containing first and second liquids, wherein the first and second variable volume reservoirs are elongate with generally constant cross-sectional shapes, and the first and second variable volume reservoirs are partially defined by the first and second pistons;
• a variable volume accumulator chamber, wherein the accumulator chamber is partially defined by the accumulator piston housed within the accumulator chamber;
• means for permitting fluid flow from the first and second reservoirs into the accumulator chamber while preventing backflow;
• a flowable material liquid delivery head including a hollow hypodermic needle;
• means for fluidly coupling the hypodermic needle to the accumulator chamber;
• means for forcing the first and second liquids form the first and second reservoirs to the accumulator chamber via the fluid flow permitting means, so that selected amounts of the first and second liquids are forced into the accumulator chamber to create a liquid mixture therein, the forcing means including a stem engageable with the first and second pistons;
• and
• means for expulsing the liquid mixture from the accumulator chamber through the delivery head via the fluidly coupling means, the expulsing means including the accumulator piston.