Patent ID: 8734363

Claim:
A coaxial needle assembly for use with a variable throw biopsy device having a needle assembly comprising a biopsy cannula and a biopsy stylet which is received by the biopsy cannula in coaxially telescoping relationship and a throw distance comprising the distance the biopsy stylet travel relative to the biopsy cannula when the biopsy device is fired, the coaxial needle assembly comprising: a cannula defining a lumen adapted to receive the needle assembly of the biopsy device and having a proximal end and a distal end; a stylet removably received within the lumen and having a proximal end and a distal end; and a throw calibrator adjustably carried by the cannula and having a proximal end and a distal end, the proximal end and defining a biopsy insertion stop adapted to arrest the insertion of the needle assembly into a tissue mass by abutting a portion of the biopsy device against the insertion stop; wherein the throw calibrator may be used to adjust the position of the insertion stop relative to the cannula to calibrate the coaxial needle assembly with the throw distance of the biopsy device.