A bioptic device of the cannula and internal stylet type wherein the stylet includes a sharp tip with a gutter adjacent to the tip for obtaining a tissue sample within a larger body of tissue. The cannula, stylet tip, and gutter bear threading to better enable the bioptic device to fix tissue when the...http://www.google.com/patents/US5660186?utm_source=gb-gplus-sharePatent US5660186 - Spiral biopsy stylet
