Bone marrow aspiration devices and methods are disclosed for use in preparing a substrate. In general, the device includes an elongate penetrating element, a chamber adapted to retain a substrate, and a fluid extraction mechanism that is effective to pull fluid through the elongate penetrating element,...http://www.google.de/patents/US20040097828?utm_source=gb-gplus-sharePatent US20040097828 - Bone marrow aspiration system
