Patent ID: 6755793
Filing Date: 2004-06-29
Classification: A61B

Abstract:
Improvement in a bone marrow extraction tool for removing marrow from a bone marrow mass comprising an outer cannula wherein the outer cannula is T-shaped being provided at its proximate end with a handle extending in opposite directions and formed with a central opening, said outer cannula having an interiorly tapered marrow-receiving distal end, and an inner cannula extending through said central opening and slidably disposed in the outer cannula, said inner cannula having a distal end formed with a plurality of longitudinal slots to define resilient sectors and a terminal marrow-receiving mouth, wherein said improvement comprises:said inner cannula defining a narrow slot extending from a distal end at said terminal marrow-receiving mouth toward the proximate end of the inner cannula for a first distance and a wide slot extending from a distal end at said terminal marrow-receiving mouth toward the proximate end of the inner cannula for a second distance substantially greater than said first distance, said resilient sectors being so dimensioned and adapted to engage the interior taper of the outer cannula to cause said mouth to diminish in diameter as said resilient sectors are cammed inward when the inner cannula is slidably inserted into the outer cannula to thereby compress marrow disposed in the mouth of the inner cannula and squeeze it off from said bone marrow mass outside the outer cannula.