| 摘要 |
Safety device for sealing a test tube (1), which device comprises a sealing plug (2, 7) made of rubber, a resilient plastic material, or of any other, corresponding elastic material and fitted inside the mouth of a test tube. Liquid is added to or removed from the test tube (1) through the said sealing plug (2, 7). According to the invention, the upper face of the sealing plug (2, 7) is shaped as a portion (3, 8) substantially conically narrowing towards the bottom of the sealing plug and guiding the pipette tip (5) or the capillary tube (6). A channel (4, 9) is provided between the tip of this conical portion (3, 8) of the sealing plug and the bottom face of the sealing plug (2, 7), through which channel the pipette tip (5) or the capillary tube (6) can be pushed. The essential feature is, however, that the channel (4, 9) is, by the effect of the elastic force, closed tightly when the pipette tip (5) or the capillary tube (6) is removed from the channel. |
