Multiple sample channel device for liquid chromatography

A multi-channel fluidic device, comprising:

• a diffusion-bonded body having a device surface, a stator surface and a plurality of fluid channels, each of the fluid channels comprising a channel segment defined in a plane that is parallel to the device surface and parallel to each of the planes of the other channel segments, wherein:
• the plane of each channel segment is at a depth below the device surface that is different from the depth below the device surface for each of the other channel segments, each of the fluid channels further comprising:
• a first orthogonal channel segment and a second orthogonal channel segment coupling a first end and a second end, respectively, of the channel segment to the stator surface, wherein:
• each of the channel segments has a volume that is equal to the volume of each of the other channel segments for storage of a plurality of equal volumes of a sample;
• and wherein:
• a first channel segment includes a first radial channel segment that is at a first depth and the second channel segment includes a second radial channel segment that is at a second depth greater than the first depth and the first radial channel segment at the first depth has a greater radius of curvature than a radius of curvature of the second radial channel segment at the second depth.