Chromatographic device having an elongate rod and method of forming a chromatographic device

A method of forming a chromatographic device comprising:

• providing a chromatographic tube having a first end and a second end opposite the first end, the chromatographic tube extending longitudinally along a tube axis;
• placing a chromatographic medium in the chromatographic tube;
• inserting a piston assembly into the chromatographic tube such that the chromatographic medium is between the piston assembly and the second end of the tube;
• partially inserting an elongate rod into the chromatographic tube such that the piston assembly is between the elongate rod and the second end of the chromatographic tube;
• moving the elongate rod generally along the tube axis and toward the second end of the chromatographic tube in a manner to move the piston assembly relative to the chromatographic tube toward the second end of the chromatographic tube to thereby compress the chromatographic medium;
• attaching a rod flange to the elongate rod such that the rod flange extends radially outwardly from the elongate rod;
• and
• operatively locking the rod flange to the chromatographic tube.

A chromatographic device comprising:

• a chromatographic tube comprising first and second opposite ends, and an inner surface, the inner surface of the tube at least in part defining an intermediate region, the intermediate region being generally between the first and second ends;
• a chromatographic medium within the intermediate region;
• a piston assembly within the tube and positioned generally between the first end of the tube and the chromatographic medium, the piston assembly defining a passage for flow of process fluid, the chromatographic medium being generally between the piston assembly and the second end of the tube;
• an elongate rod extending partially into the chromatographic tube such that the piston assembly is between the elongate rod and the second end of the chromatographic tube, the elongate rod having a threaded outer surface;
• a threaded member threaded to the threaded outer surface of the elongate rod, the treaded member being operatively secured to the chromatographic tube.

A chromatographic device comprising:

• a chromatographic tube comprising first and second opposite ends, and an inner surface, the inner surface of the tube at least in part defining an intermediate region, the intermediate region being generally between the first and second ends;
• a chromatographic medium within the intermediate region;
• a piston assembly within the tube and positioned generally between the first end of the tube and the chromatographic medium, the piston assembly defining a passage for flow of process fluid, the chromatographic medium being generally between the piston assembly and the second end of the tube;
• an elongate rod extending partially into the chromatographic tube such that the piston assembly is between the elongate rod and the second end of the chromatographic tube;
• a rod flange attached to the elongate rod, the rod flange being operatively secured to the chromatographic tube.