| 摘要 |
A prepackaged, injectable pharmaceutical hypodermic needle has semi-rigid outer container, supported within which is a substantially non-resiliant inner container containing a pre-measured dose of the pharmaceutical. A cannula extending through and fixed with respect to the outer container is adapted to pierce the inner container for injection of the pharmaceutical upon manual collapsing or squeezing of the outer container. Air flow openings in the outer container permit the flow of air into the cavity between the inner and outer containers upon manual release during successive manual compression or squeezing operations, thereby obviating the possibility of negative air pressure being exerted upon the inner container.
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