Patent ID: 7938816

Claim:
A bag for medical use for infusing medication by gravity, comprising: at least a first compartment, a second compartment and a third compartment, the first compartment configured to contain medication in the form of a solution, the third compartment configured to contain a first rinsing solution, and the second compartment configured to contain a second rinsing solution, wherein the first compartment, the second compartment and the third compartment are juxtaposed, a first separation/communication portion that separates the first compartment and the third compartment, wherein the first separation/communication portion comprises a breakable device disposed between the first and the third compartment and the breakable device is disposed at a bottom end of the first separation/communication portion when the bag is suspended vertically, and a second separation/communication portion that separates the second compartment and the third compartment, wherein the second separation/communication portion comprises a communication channel disposed at an end of the bag that is above the second compartment when the bag is suspended vertically, and an access port for an infusion line disposed at a bottom portion of the third compartment when the bag is suspended vertically, wherein the breakable device prevents communication between the first compartment and the third compartment when not broken, and the breakable device allows communication between the first compartment and the third compartment when broken, wherein if the breakable device is broken, the medication is capable of flowing into the third compartment and flowing into the infusion line via the third compartment, and wherein the second rinsing solution is capable of flowing into the third compartment via the communication channel and flowing into the infusion line, after the first compartment and the third compartment are almost emptied, wherein the communication channel has an output side disposed at a height that substantially prevents the second rinsing solution from entering the third compartment until after the first compartment and the third compartment are almost emptied of the medication solution, and wherein the second separation/communication portion is configured to allow the second rinsing solution to automatically flow into the third compartment via the communication channel when a pressure in the first compartment and the third compartment becomes negative with respect to a pressure in the second compartment under a siphon effect created by a fluid column height in the infusion line.