A piercing instrument (12) for obtaining a non-activated drop of blood (B) by capillary puncture is formed by depositing a coating agent (20) on the exterior surface of the piercing instrument (12). The coating agent comprises compounds that inhibit the activation of blood....http://www.google.de/patents/US6468287?utm_source=gb-gplus-sharePatent US6468287 - Lancet for capillary puncture blood samples
