to aspirate bone marrow from any bone however the following exemplary method is illustrated and described with reference to a human pelvic bone in addition the exemplary method is not limited to the exact order described below and a person of ordinary skill in the art would recognize that additional or fewer steps may be necessary to obtain a bone marrow sample from the bone referring to fig7 a once an insertion location is selected and the site is prepared for the extraction process measurements markings anesthetics etc the needle assembly 10 is inserted into a bone marrow space 11 inside a bone 12 the needle assembly 10 may be pushed in by hand hammered in or drilled into the bone marrow space 11 using an insertion tool t in one non limiting embodiment if an insertion tool t is used for insertion the handle 14 see fig1 may first be removed from the needle assembly 10 prior to attaching the insertion tool t to the adaptor 54 of the cap 44 of the trocar 18 the distal portion 30 of the cannula 16 and the tip portion 50 of the trocar 18 facilitate insertion of the needle assembly 10 into the bone marrow space 11 next as illustrated by fig7 b the trocar 18 of the needle assembly 10 is removed from the cannula 16 the cap 44 of the trocar 18 may need disconnected from the handle 14 of the needle assembly 10 see fig1.