A hemi-cannula for tracheotomy patients, includes a main tubular body (1.1) which is made from a suitable flexible material and which includes peripheral end fixing flanges (1.2 and 1.3). One of the flanges (1.2), which is intended to be disposed inside the trachea next to the inner face of same, takes the form of a wing including a cylindrical surface with an oblique axis in relation to an axis perpendicular to the main axis of the main body (1.1). The other flange (1.3) takes the shape of a truncated cone including a larger outer base. A conduit forming the main tubular body passes through the center of both of the flanges.
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