Patent ID: 7645267
Filing Date: 2010-01-12
Classification: A61M

Abstract:
1. A prefilled medical syringe comprising: a syringe barrel enclosing an inner space; a syringe plunger disposed in the space and coupled to a first end of a plunger rod, the plunger rod having an outer thread that is formed between the first end and a second end and a non-threaded portion disposed between the outer thread and the first end; an end plug closing off a cannula end of the syringe barrel, the end plug having a through-channel closed off by a membrane; a finger support disposed on an end of the syringe barrel opposite the end plug and having a through-opening for the plunger rod; and a thread system that cooperates with the plunger rod and with the finger support, the thread system having a thread sleeve with an inner thread that cooperates with the outer thread on the plunger rod to move the plunger rod relative to the syringe barrel, wherein the thread sleeve is attached to the finger support prior to the outer thread of the plunger rod meshing with the inner thread of the thread sleeve; and wherein movement of the plunger rod and the thread sleeve relative to the syringe barrel causes the thread sleeve to be disconnected from the finger support.