Components of a fluid transfer apparatus
A syringe that is configured for use in a syringe pump. The syringe has a flange at the proximal end of a barrel and a sealing element at its proximal end. The sealing element has of a disk shaped annular sealing assembly having a hole in its center through which a piston rod passes. The sealing assembly has an upper part and a lower part that are pressed together to hold an O-ring that seals around the piston rod. The sealing assembly is placed inside the barrel of the syringe; thereby not disturbing the external shape of the syringe and allowing the syringe to fit into dedicated grooves on syringe pumps.
1 . A syringe configured for use in a syringe pump, the syringe comprising a flange at a proximal end of a barrel and a sealing element at a proximal end of the syringe, the sealing element comprised of a disk shaped annular sealing assembly having a hole in its center through which a piston rod passes, the sealing assembly comprised of an upper part and a lower part that are pressed together towards each other between the barrel and the piston rod at least in a direction transverse to the barrel to hold therebetween an O-ring that seals around the piston rod, the sealing assembly comprising a gap between at least a portion of the upper part and at least a portion of the lower part in the direction transverse to the barrel;
wherein the sealing assembly is placed inside the barrel of the syringe and is fixedly held in place at the proximal end of the barrel; thereby not disturbing the external shape of the syringe and allowing the syringe to fit into dedicated grooves on syringe pumps, said fixed holding of the sealing assembly at the proximal end of the barrel being independent of the flange, wherein at least one of the upper part and the lower part is held in place and sealed to the inside of the barrel of the syringe by at least one of: press fitting, laser welding, ultrasound welding, heat welding, and gluing, and
wherein the sealing assembly has a barrel facing surface facing an internal volume of the barrel, and an opposite exterior facing surface, the exterior facing surface being free of overlay by the barrel as well as the flange.
2 . The syringe of claim 1 , wherein the syringe can be used for either closed or open transfer systems.
3 . The syringe of claim 1 , wherein said at least one of the upper part and the lower part is pressed against the inside of barrel, and at least the other one of the upper part and lower part is pressed against the piston rod.
4 . The syringe of claim 1 , wherein at least one of the upper part and the lower part is held in place and sealed to the inside of the barrel of the syringe by at least one of: laser welding, ultrasound welding, heat welding, and gluing.