Biopsy devices and related methods

A method of forming an intraosseous biopsy needle operable to obtain a sample of bone marrow from a selected target area, the method comprising:

• providing the biopsy needle with an elongated hollow bore extending longitudinally from a first end to a second end thereof, the first end having an opening in communication with the hollow bore;
• providing a mandrel having a first end and an insulator, the first end operable to be inserted into the first end of the biopsy needle, and the insulator disposed adjacent to the first end;
• placing a helical coil on an exterior portion of the mandrel adjacent to the first end of the mandrel;
• inserting the helical coil and the first end of the mandrel into the opening at the first end of the biopsy needle until the insulator contacts the first end of the biopsy needle, such that the helical coil and the first end of the mandrel are positioned at a location within the elongated hollow bore of the biopsy needle;
• and
• transferring the helical coil from the mandrel to an inside diameter of the biopsy needle adjacent to the first end thereof, such that the helical coil is disposed at the first end of the biopsy needle proximate the opening and away from the second end of the biopsy needle.

An intraosseous access device operable to be rotatably inserted into a bone and associated bone marrow, the intraosseous access device comprising:

• an outer penetrator including a first end having a cutting surface, a second end, and a longitudinal bore extending from the first end of the outer penetrator to the second end of the outer penetrator;
• an inner penetrator operable to be slidably received within the longitudinal bore of the outer penetrator, the inner penetrator including a first end having a first tapered cutting surface and a second tapered cutting surface, the first and second tapered cutting surfaces forming a tip on the first end of the inner penetrator;
• the first tapered cutting surface extending a first length from the cutting tip on the first end of the inner penetrator, and the second tapered cutting surface extending a second length from the cutting tip on the first end of the inner penetrator;
• where a portion of the first tapered cutting surface of the inner penetrator is located proximally to the cutting surface of the outer penetrator when the inner penetrator is fully received in the outer penetrator, where the second tapered cutting surface of the inner penetrator is located distally to the cutting surface of the outer penetrator when the inner penetrator is fully received in the outer penetrator, and where a proximal end of the second tapered cutting surface is disposed adjacent to the cutting surface of the outer penetrator when the inner penetrator is fully received in the outer penetrator;
• and
• where the cutting surface of the outer penetrator and the first and second tapered cutting surfaces of the inner penetrator are configured to cooperate with each other to penetrate the bone and associated bone marrow.