Abstract: The present invention relates to a cannula (1) including a tubular body (2) with a first end (3) intended for being inserted in a surgical opening or natural orifice of a patient and a second end (4) intended for remaining on the outside and engaging with the opening by means of a flange, characterised in that the flange has at least one gripping tab (7).

Abstract: A filter for covering a surgical orifice at a base of the neck of a tracheotomized person and connecting the trachea to the ambient atmosphere. The filter comprises a bib having a cutout neck with a border extended by one or more attachment strips adapted to form with the border a closed loop around the neck of the person by complementary joining elements which may not be separated after being joined, so that the filter cannot be re-used.