| 摘要 |
<p>A section cannula (1), in particular for dental work, draws in the fluid to be removed via a flattened orifice (4) of a tube (2). In front of this entry opening (4) is located a lip-type projection (6) as an extension of the wall of the tube (2), the front edge (7) of said projection and its side edges (10) being provided with bulges (8) which are rounded. Because of this as well as by means of a thickening (11) of the upper wall of the entry aperture (4), a noise attenuation is achieved as well as improved withdrawal of the medium to be extracted, and in addition the patient finds this more agreeable for his mouth.</p> |
