Full core biopsy device

A biopsy device comprising:

• an outer needle hub;
• an outer needle coupled at a proximal end to the outer needle hub, the outer needle including:
• an outer needle tip at an opposite distal end;
• a circumferential cutting edge defined at said tip configured for cutting tissue;
• and
• an inner surface defining a lumen through said outer needle for receiving tissue therein, said inner surface including a countersink formed at said tip;
• an inner needle hub;
• an inner needle coupled at a proximal end to said inner needle hub, the inner needle including an inner needle tip at an opposite distal end, said inner needle coaxially disposed within the outer needle;
• and
• a mechanism coupled to said outer needle hub and to said inner needle hub for charging and firing said outer needle relative to said inner needle to capture a tissue sample within the lumen of said outer needle, said mechanism configured to fire said outer needle over a stroke length,
• wherein the countersink has a length extending proximally from said cutting edge toward said proximal end of said outer needle that is ten percent (10%) to twenty percent (20%) of said stroke length,
• wherein said outer needle has a thickness from the proximal end of said countersink to said proximal end of said outer needle of at least 0.003 inches.