Patent ID: 9028780
Filing Date: 2015-05-12
Classification: B01L,G01N

Abstract:
1. A compound sample needle for liquid chromatography, comprising: a rigid needle having a coupling end and an internal channel for passage of a sample fluid, the coupling end having a face and a counterbore; a flexible tubing having an internal channel for passage of the sample fluid, an outer surface and a coupling end disposed in the counterbore of the rigid needle, the coupling end of the flexible tubing having a face in contact with a base of the counterbore, the coupling ends of the rigid needle and flexible tubing being secured to each other by a weld along a circumference of the outer surface and the face of the rigid needle, the internal channel of the rigid needle portion being collinear with the internal channel of the flexible tubing at the coupling ends; and a rigid sleeve disposed over the coupling end of the rigid needle portion and the coupling end of the flexible tubing.