A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/85
A61M 5/00 (2006.01)
Patent
CA 1059398
ABSTRACT OF THE DISCLOSURE This invention relates to a new and improved drive system and syringe for syringe pumps, wherein a disposable syringe cartridge having no valves is reliably and precisely mounted, monitored, and driven through repetitive fill and pump strokes. Prior art disposable syringes are complex and expensive and prone to leakage. Additionally, they are difficult to mount and remove. The present invention overcomes these deficiencies by providing a syringe cartridge which has no valves, and the apparatus repetitively and sequentially opens and closes, by means of an external pair of tube pinchers, a pair of intake and output I.V. tubes communicating with the inlet and outlet nipples. The cartridge includes a molded plastic cylinder having inlet and outlet nipples, a plastic piston and piston rod, and a rubber sealing cap defining a conical piston face, a pair of piston sealing rings and a sealing boot. A coupling shoe, defining a yoke for receiving mounting bosses on the piston rod, is shaped to receive the mounting bosses with the longi- tudinal axis of the syringe horizontal, to enable rotation to a vertical position for the longitudinal axis, and to restrain the syringe against horizontal or vertical dislocation relative to the coupling shoe.
305941
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