Patent ID: 7722594

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