Design diagram of a preservative-free multi-dose dropper using air pressure differentials. (A) The structural assembly of the multi-dose dropper, highlighting the nozzle and container sections. (B) The internal mechanism, including the external and inner buttons, valves, and membrane filter.

Korean J Clin Lab Sci 2024;56:339-48 https://doi.org/10.15324/kjcls.2024.56.4.339

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