Patent ID: 8663580

Claim:
A dried biological fluid spot punch device, comprising: a tube comprising a main section and a distal section adjoining the main section, wherein the main section comprises a proximal tube end circumscribing a proximal tube opening, the distal section comprises a distal tube end circumscribing a distal tube opening, and the distal section further comprises a distal tube wall having a tapered inside diameter that reduces from the main section to the distal tube opening, wherein the distal tube end comprises a sharp edge and hardness effective for punching through a substrate on which the dried biological fluid spot is formed; a frit disposed in the distal section at a distance from the distal tube opening and fixed in position by frictional contact with the distal tube wall; a filter disposed on the frit; and a punching tool comprising a body engaging the tube at the proximal tube end and an ejection mechanism configured for disengaging the body from the tube.