| 摘要 |
An apparatus, viz. an automatic fluid injector, useful for the injection of very small, accurately measured quantities of fluid specimens into various media, e.g., the inlets of modern analytical instruments. The improved apparatus combination embodies an injector feed assembly wherein the probe sub-assembly comprises the combination of (i) an outer rigid tubular needle of relatively large inside diameter, and (ii) an inner flexible tubular needle, one terminal end of which is concentrically contained within said outer rigid tubular needle and of sufficiently small outside diameter to form an annulus between the external surface of said inner flexible tubular needle and the internal surface of said outer rigid tubular needle, while the opposite end of said inner flexible tubular needle is communicated with the barrel of said syringe. The outer rigid tubular needle protects the inner flexible needle on thrust of the probe sub-assembly through the septum of a fluid specimen-containing vial. Thereafter, a terminal end of the inner flexible tubular needle can be moved, or thrust from within the protective interior to the outside of said outer rigid tubular needle, and extended to the very bottom of a fluid specimen-containing vial carried by the magazine such that essentially all of the fluid specimen can be removed from the vial, picked up by the probe sub-assembly, and delivered to the barrel of the syringe for injection.
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