Infant nasal aspirators are known in which a hollow nose-piece, that in use communicates with the interior of a nostril, is connected via hollow pipe to a suction device. An aspirator (10) includes a nose-piece having formed therein a hollow chamber containing a sponge- or gauze-like filter (21). The material of the filter (21) absorbs mucus sucked thereinto and thereafter acts as a one way valve preventing backflow of the mucus. Gradual clogging of the filter provides an indication of the remaining useable life of the filter. The filter (21) or the cartridge (14) containing it are disposable.
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