Patent ID: 7278972

Claim:
An improved combined bone marrow aspiration and core biopsy device of the type having a cannula with proximal and distal ends adapted to capture a core sample of bone marrow, the cannula having a wall extending between its proximal and distal ends including a cylindrical wall portion of a first internal diameter and having a tapered wait portion on its distal end terminating in a distal opening of a second smaller diameter than the first diameter, a cannula handle attached to the cannula proximal end and defining a conduit communicating with said cannula and having a proximal opening, a stylet having a body with proximal and distal ends slidably disposed within the cannula and defining an annular passage between the inside of the cannula cylindrical wall portion and the outside of the stylet body, and a stylet handle attached to the proximal end of the stylet, wherein the improvement comprises: a first fluid seal blocking fluid flow through said proximal opening when the stylet is moved to an aspirating position. a second fluid seal simultaneously blocking fluid flow through said distal opening when the stylet is moved to said aspirating position, at least one fluid aspirating port in the cannula wall on the distal end thereof communicating with said annular passage adjacent the distal end of the cannula, and at least one fluid collection port communicating with the annular passage adjacent the proximal end of the cannula, whereby fluid is withdrawn from outside the cannula, through the aspirating ports through said annular passage and collected through the collection port.