Patent ID: 8343133
Filing Date: 2013-01-01
Classification: A61B,A61M

Abstract:
1. A method for aspirating bone marrow from bone comprising: inserting a rigid stylet through an outer cannulated needle such that a stylet tip of the rigid stylet extends beyond a needle tip of the outer cannulated needle; inserting the rigid stylet and the outer cannulated needle through a bone cortex and into a bone marrow cavity; withdrawing the rigid stylet from the bone; connecting an inner aspiration needle to a collar having internal threads mounted to the outer cannulated needle such that a needle portion of the inner aspiration needle extends through the needle tip of the outer cannulated needle and a threaded portion of the inner aspiration needle threadably engages the internal threads of the collar; aspirating a first quantity of bone marrow from the bone marrow cavity through ports in a tip portion of the inner aspiration needle; rotating the inner aspiration needle in a first direction relative to the outer cannulated needle to move the inner aspiration needle from a first position in the bone marrow cavity to a second position in the bone marrow cavity; and aspirating a second quantity of bone marrow from the bone marrow cavity through the inner aspiration needle with the inner aspiration needle in the second position, the depth of the inner aspiration needle in the bone marrow cavity when in the first position is different from the depth of the inner aspiration needle in the bone marrow cavity when in the second position.