Patent ID: 6342045
Filing Date: 2002-01-29
Classification: A61M

Abstract:
A safety syringe for medical use comprising:a barrel having a distal part and a proximal part; a needle-carrier sliding in a watertight fashion in the distal part of the barrel; a plunger having a shaft and sliding in a watertight fashion in the proximal part of the barrel; the plunger and the needle-carrier each comprising a coupling organ interconnecting by a simple axial push on the plunger to enable the needle-carrier with its needle to be withdrawn inside the barrel after injection; the distal part of the barrel having an internal annular stop which prevents the needle-carrier from being pulled or pushed out of the barrel through its distal opening; a central part of the needle-carrier having an external diameter greater than the internal diameter of the annular stop; a proximal part of the needle-carrier having a diameter corresponding to the internal diameter of the distal part of the barrel; manually operated control means slidably mounted on the barrel and comprising locking members, displaceable from a forward locking position where said members positively lock the needle-carrier in its forward-most distal position in the barrel and prevents said needle-carrier from being pushed inside the barrel due to an axial pressure applied to a distal end of the needle-carrier, or from being withdrawn inside the barrel by the plunger to a retracted unlocked position after the locking members are disengaged from the needle-carrier, which is then free to be pulled or withdrawn inside the barrel.