THERMOPLASTIC BOTTLE WITH CONTROLLED LATERAL COLLAPSE AND METHOD OF DISPENSING LIQUID THEREFROM

摘要

A collapsible oval thermoplastic bottle that accurately measures the volume of sterile medical liquid dispensed without inletting air into the bottle. The bottle contains a sterile liquid and a constant mass of sterile gas above the liquid. A rigid oval base and a rigid oval shoulder of the bottle cooperate with a flexible oval side wall of the bottle to "control the lateral collapse" of the bottle. This "controlled collapse" redistributes the constant mass of gas within the bottle to maintain portions of the side wall at the liquid level in spaced relationship for accurate volumetric readings against calibrations on the bottle. A 1 liter collapsible bottle has an accuracy of +30 ml., which accuracy is equivalent to that of a rigid glass bottle of the same size.