Patent ID: 6302869
Filing Date: 2001-10-16
Classification: A61M

Abstract:
A syringe for receiving an ampoule having a cylindrical interior of a specified first diameter, said syringe comprising:a flexible piston rod having a tape-shaped body, said body including opposed top and bottom surfaces and opposed sides, wherein said piston rod further includes a plurality of support members spaced axially along said body and projecting from said top surface, wherein said support members have distal ends spaced away from said body, and wherein said sides and said distal ends, when said piston rod is viewed in cross-section, lie at least generally along a circle having a diameter which is approximately the same as said first diameter so that, when said piston rod extends into the cylindrical interior of an ampoule, the sides and distal ends will abut the ampoule interior at least at three contact positions, and wherein one of said contact positions is located on a half of said circle opposite to the other two contact positions; anda piston rod guide member for guiding a portion of said piston rod, which is located outside of an ampoule interior, along a curved guide surface.