Patent ID: 8690791

Claim:
A hollow drive shaft assembly operable to penetrate a bone and associated bone marrow comprising: an outer hollow drive shaft operable to penetrate the bone and associated bone marrow; the outer hollow drive shaft operable to be rotated by a motor; an inner channel formed in the outer hollow drive shaft; the inner channel of the outer hollow drive shaft operable to convey specimens of bone and associated bone marrow therethrough; a first gear attached to the outer hollow drive shaft; the first gear engaged with a second gear attached to the motor to rotate the outer hollow drive shaft; an inner channel formed in the outer hollow drive shaft; the inner channel of the outer hollow drive shaft operable to convey specimens of bone and associated bone marrow therethrough; the outer hollow drive shaft having a first end operable to penetrate the bone and associated bone marrow; the outer hollow drive shaft having a second end operable to retrieve specimens of bone and the associated bone marrow; a plurality of sampling ports formed in the outer hollow drive shaft spaced from the first end, the sampling ports operable to provide access to the associated bone marrow; a removable inner trocar disposed in the inner channel of the outer hollow drive shaft; a sampling port formed in the removable inner trocar spaced from a first end of the inner trocar, the sampling port of the removable inner trocar operable to be aligned with respective sampling ports of the outer hollow drive shaft; a ratcheted gear attached to the trocar; and the ratcheted gear operable to change the depth of sampling from the bone marrow.