Importance

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Abstract

A reservoir for a pharmacologic delivery system wherein liquid level changes are readable visually to an accuracy of within five microliters. The reservoir is formed as a spirally coiled tubular member disposed between a pair of plate members spaced apart by one or more concentric rims. The tubular member forms a continuous spiral coil between the plate members, one tube end porting through one of the plates at the center thereof and the other tube end porting at the plate circumference. Transparent materials of construction are employed, as appropriate, and one of the plate members may have indicia thereon for assisting the viewer to measure volume changes inside the reservoir.

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First Claim