| 摘要 |
An injection needle particularly intended for transferring a representative fluid sample into a sample bottle (1) which is closed by a membrane (2) made from a rubber elastic material. The needle comprises a tubular inner wall (6 ) having a needle point (8), and a tubular outer wall (10) concentrically surrounding and radially spaced from the inner wall (6) at least along a portion thereof distant from the needle point (8) and, at its end facing the needle point, having a conically tapering portion (12) sealingly engaging th e inner wall (6). The outer wall (10) is provided with at least two apertures (14, 16) spaced longitudinally of the needle. When using the injection needl e for the above purpose, fluid is injected into the sample bottle (1) from a fluid source of interest, by inserting the injection needle into the sample bottle through the membrane to a level at which the penetrated portion of th e membrane (2) sealingly engages the outer wall (10) of the needle between the spaced apertures (14, 16) in the outer wall, such that initially some of the fluid that is injected into the bottle is allowed to flow into the annulus between the inner and outer walls of the needle (4), through the aperture (1 4) of the outer wall at the inside of the membrane, and hence out through the aperture (16)of the outer wall at the outside of the membrane.
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