A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/85
A61M 5/00 (2006.01)
Patent
CA 1054891
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 over- comes 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 cartride 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. The syringe has inlet and outlet nipples projecting from one end thereof, and a fixed reference tight source is positioned on one side of one of the nipples. A fixed photosensor on the opposite side is adapted to receive the light from the reference light source only when the nipple is not interposed between the light source and the photosensor.
305942
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