Patent ID: 8043253

Claim:
A system for bone marrow aspiration, comprising: an aspiration cannula having a flexible length coupled at a proximal end to a handle and attached at a distal end to a distal tip shaped to disrupt bone marrow within a bone marrow cavity, wherein the flexible length is configured to allow the aspiration cannula to follow a path within the bone marrow such that the distal tip is deflectable in all directions relative to a proximal end of the aspiration cannula when advanced through the bone marrow; wherein the aspiration cannula defines one or more openings near the distal tip, the one or more openings being configured to aspirate disrupted bone marrow when the cannula is placed within the bone marrow and the distal tip is rotated relative to the handle when advanced through the bone marrow, and wherein the distal tip comprises a rotatable drill tip, the rotatable drill tip comprising a proximal fluted tapered portion which is tapered in a distal direction from a proximal end of the drill tip and a distal portion having a rounded blunt tip, wherein the distal tip terminates at the rounded blunt tip and wherein the distal tip is shaped to pass through the bone marrow while also shaped to be inhibited from puncturing through a cortical layer of bone such that the aspiration cannula is retained within the bone marrow cavity and the rotatable drill tip is configured to move sideways directly along the cortical layer of bone upon encountering the cortical layer of bone while rotating and without puncturing out of the bone marrow cavity.