Patent ID: 7875175

Claim:
A chromatography system comprising: a first fluid pump for providing a strong mobile phase at a predetermined flow rate and composition, an injector for injecting a sample solution into the strong mobile phase to form a sample-containing strong mobile phase, a second fluid pump for providing a weak mobile phase to the sample-containing strong mobile phase at a predetermined flow rate and composition to form a sample-containing weak mobile phase, a chromatographic column containing a chromatographic sorbent for separating the sample, and a column fitting device for combining the sample-containing strong mobile phase with the weak mobile phase to form the sample-containing weak mobile phase prior to the chromatographic sorbent; wherein the column fitting device is integral with an inlet end fitting of a chromatographic column, said column fitting device having a recessed cavity located within the inlet end fitting such that the fluid streams entering the column fitting device are combined in the recessed cavity.