Rheodyne, LLC

Reginald E Sylvester

Stephen R Bakalyar

A sample injector is described for receiving a sample at atmospheric pressure and injecting it at a high pressure into a chromatographic column, which is convenient to use and which avoids loss of the sample. The device includes a rotor and stator with flat adjacent faces, and a passage in the rotor for receiving a syringe needle that can transfer the sample into an aligned port in the stator, wherein the needle-receiving passage extends parallel to the axis of rotation of the rotor but is offset therefrom. This enables the needle to be inserted with its tip flush with the interface between the rotor and stator, so that no sample lies in the rotor passage after operation of the syringe, and so that rotation of the rotor isolates the syringe needle from the high pressure ports. With this arrangement, and with the needle end ground perpendicular to its axis, all of the sample in the syringe is transferred to the stator port and from there to the column.

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Hercules, CA, United States of America

Reginald E Sylvester