Patent ID: 8544350

Claim:
A sample injector for injecting a fixed amount of a sample into a mobile phase medium and discharging the mobile phase medium with the sample, the sample injector comprising: a first member having a first outer peripheral surface having a convex curve, the first member including a medium passage for supplying the mobile phase medium and a sample passage for supplying the sample, the medium passage and the sample passage having openings on the first outer peripheral surface; a second member having a second outer peripheral surface having a concave curve, the second member including a discharge passage for discharging the mobile phase medium with the sample to an outside of the injector, the discharge passage having an opening on the second outer peripheral surface, the second member being in contact with the first member; and a sample chamber having a recessed shape, formed on either one of the first and second outer peripheral surfaces, the sample chamber being configured to receive and hold a prescribed amount of the sample, wherein the first and second outer peripheral surfaces are in surface contact with each other so as to allow a relative sliding motion of the first member and the second member between a sample charging position and a sample injection position thereof, wherein the sample chamber connects to the sample passage when the first and second members are in the sample charging position such that the sample flowing through the sample passage is charged into the sample chamber, and wherein the sample chamber connects to the medium passage and the discharge passage when the first and second members are in the sample injection position such that whereby the sample held in the sample chamber is injected into the mobile phase medium flowing through the medium passage.