| 摘要 |
1. A blood sampling device comprising a cylindrical sample tube (1) and slidable therein a plunger (2), and also comprising an end cap (4) on which there is eccentrically disposed an axially directed cone (9), an adapter (5) fitted on the cone and having two cannulae (6, 18) secured thereon, the outer cannula being free for introduction into a vein while the inner cannula is closed by a tyre valve (19) characterised by a non-return valve which is disposed in the end cap (4) and which consists of an elastically deformable diaphragm (10) having a central valve aperture (11) and a cylindrical support ring (13) for the diaphragm (10), said ring being inserted into the end cap (4), the diaphragm (10) and the support ring (13) being constructed as a one-piece diaphragm ring (20) and the diaphragm (10) being disposed in the support ring (13) so as to be inwardly offset and being externally formed as a spherical segment such as to project somewhat beyond the edge of its support ring (13) and a circular valve seat (12) integrally formed concentrically on the inside of the end cap (4). |
