EP0511402A1 — Double-chamber type syringe barrel

USPTO Abstract

A double-chamber type syringe barrel which contains a frozen dry powdery medicine and dissolving liquid separately from each other but, when used, injects a mixture of said powdery medicine and dissolving liquid. The conventional double-chamber type syringe barrel causes turbidity in the liquid of mixture of powdery medicine and dissolving liquid which is not appropriate for medical use, and is unsatisfactory in operability during injection operation. A double-chamber type syringe barrel of this invention eliminates drawbacks in the prior art with improved silicone coating inside the syringe barrel and modified shape of the barrel, in which: the syringe barrel (3) is coated with silicone oil solution with a concentration of 0.3 % (W/V) or under on the part of the inner wall thereof with which the frozen dry medicine is in contact, and is provided with a layer coated with silicone oil solution with a concentration of 1 % (W/V) or more on the other part of the inner wall thereof substantially out of contact with the medicine; a stopper (14) is porvided for preventing a gasket from slipping off; and finger flanges (11), (12) are provided at two positions on the barrel. In this way, turbidity caused when dissolving the frozen dry medicine with dissolving solution in the syringe barrel can be suppressed to such a degree as is permitted in using the medicine and a syringe barrel is made excellent in operability.