Bag for infusion solution and method of manufacturing same

Abstract

A bag for an infusion solution has front and back wall portions each formed of a flexible plastic film and provided with a plurality of chambers which are filled with one infusion solution and another infusion solution or medicament, independently. The chambers are sectioned by a boundary portion having at least one weak seal portion which is closed by separably bonding inside surfaces of the plastic films mutually facing at the boundary portion so that the one infusion solution and the another infusion solution or medicament in the respective chambers are mixed together when the weak seal portion is opened. The weak seal portion is formed by applying a separable coating material, which provides a reduced bonding strength in a heat sealing process, on one or both inside surfaces of the plastic films mutually facing at the boundary portion and then effecting heat sealing process to the boundary portion. The separable coating material is applied in a form of a dot-pattern through a printing process.

What is claimed is:  
     
         1 . A bag for an infusion solution having front and back wall portions each formed of a flexible plastic film and provided with a plurality of chambers which are filled with one infusion solution and another infusion solution or medicament, independently, said chambers being sectioned by a boundary portion having at least one weak seal portion which is closed by separably bonding inside surfaces of the plastic films mutually facing at the boundary portion so that the one infusion solution and the another infusion solution or medicament in the respective chambers are mixed together when the weak seal portion is opened, 
 wherein said weak seal portion is formed by applying a separable coating material, which provides a reduced bonding strength in a heat sealing process, on one or both inside surfaces of the plastic films mutually facing at the boundary portion and then effecting heat sealing process to the boundary portion.    
     
     
         2 . A bag for an infusion solution according to    claim 1   , wherein said separable coating material is applied in a form of a dot-pattern.  
     
     
         3 . A bag for an infusion solution according to    claim 1   , wherein one chamber, which is filled with the infusion solution to be flowed out into another chamber adjacent to said one chamber by opening the weak seal portion formed between both the chambers, has a portion protruded towards said weak seal portion.  
     
     
         4 . A bag for an infusion solution according to    claim 1   , wherein said boundary portion has a seal portion hard to be opened other than said weak seal portion.  
     
     
         5 . A bag for an infusion solution according to    claim 1   , wherein said separable coating material contains silicone release agents.  
     
     
         6 . A method of manufacturing an infusion solution bag which has front and back wall portions each formed of a flexible plastic film and which is provided with a plurality of chambers which are filled with one infusion solution and another infusion solution or medicament, independently, said chambers being sectioned by a boundary portion having at least one weak seal portion which is closed by separably bonding inside surfaces of the plastic films mutually facing at said boundary portion so that one infusion solution and the another infusion solution or medicament in the respective chambers are mixed together, said manufacturing method comprising the steps of: 
 preparing a flexible plastic film;    applying a separable coating material, which provides a reduced bonding strength in a heat sealing process, on one or both inside surfaces of the plastic films in an area forming the weak seal portion;    mating or folding the plastic film so as to form overlapped two portions forming the front and back wall portions of the infusion solution bag;    effecting heat sealing to an area forming peripheral edge portions of the infusion solution bag except portions at which filling ports are formed and effecting heat sealing to an area forming the boundary portion including the weak seal portion;    filling the one infusion solution and another infusion solution or medicament into the chambers, independently; and    closing and sealing the filling ports.    
     
     
         7 . A manufacturing method according to    claim 6   , wherein said separable coating material is applied in a form of dot-pattern and said dot-pattern is changeable in area ratio thereof for adjusting separability of the weak seal portion.  
     
     
         8 . A manufacturing method according to    claim 7   , wherein said separable coating material is applied so as to provide a dot-pattern on the inside surface of the plastic film through a printing process.  
     
     
         9 . A manufacturing method according to    claim 6   , wherein said separable coating material contains silicone release agents.