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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

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.

대표청구항 ▼

In a fluid injector useful for the measurement and injection of preselected quantities of a fluid specimen into a medium such as an inlet to an analytical instrument wherein there is included the combination of (A) a syringe inclusive of a barrel into which a fluid specimen can be loaded, a needle m

In a fluid injector useful for the measurement and injection of preselected quantities of a fluid specimen into a medium such as an inlet to an analytical instrument wherein there is included the combination of (A) a syringe inclusive of a barrel into which a fluid specimen can be loaded, a needle mounted on an end of the barrel, and means for the displacement of the fluid specimen from said barrel via the dispensing end of the needle into said inlet, (B) an injector feed assembly comprises of a probe sub-assembly inclusive of a pair of concentrically mounted hollow needles for the pick up of said fluid specimen for filling the barrel of said syringe, and (C) a magazine for transporting one or more fluid specimen-containing septum sealed vials for pick up of fluid from a vial by the pairof hollow needles of said probe sub-assembly of said injector feed assembly for delivery to the barrel of said syringe via thrust of the hollow needles of said probe sub-assembly through the septem of a vial on pressurizing the contents of said vial by delivery of gas from a source through an annulus between the exterior surface of said inner hollow needle and the interior surface of said outer hollow needle of the pair of concentrically mounted hollow needles of said probe sub-assembly to produce flow of fluid specimen from said vial through the probe sub-assembly to the barrel of the syringe, the improvement wherein the pair of concentrically mounted hollow needles of said probe sub-assembly of the injector feed assembly (B) is comprised of the combination of (i) an outer rigid tubular needle of relatively large inside diameter, an end of which is directly affixed to said injector feed assembly, and (ii) an inner flexible tubular needle, a terminal end and at least an adjacent portion thereof of which is contained within the bore of said outer rigid tubular needle and is 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, whereby the outer rigid tubular needle protects the inner flexible needle when the pair of concentrically mounted hollow needles of the probe sub-assembly is thrust through the septum of a fluid specimen containing vial delivered by the magazine, and the inner flexible tubular needle can thereafter be thrust outside said outer rigid tubular needle and extended to the very bottom of a fluid specimen-containing vial such that on pressurization of the contents of the vial with a gas delivered via the annulus of the pair of concentrically mounted hollow needles of the probe sub-assembly essentially all of the fluid specimen can be removed from a vial, picked up by the probe sub-assembly, delivered to the barrel of the syringe, and injected into a medium via the dispensing end of the needle of the syringe.