Patent ID: 8357103

Claim:
A biopsy device comprising: an outer cannula slidably mounted to a housing; an inner cannula including a lumen and a tissue receiving aperture positioned at a distal end thereof, wherein the tissue receiving aperture is in fluid communication with the lumen, said inner cannula being slidably mounted within said outer cannula and slidably mounted to said housing; a vacuum chamber disposed in said housing proximate to an open proximal end of said inner cannula; and a trigger mechanism operative to cause said distal end of said hollow inner cannula to advance away from said housing to expose the tissue receiving aperture in response to a first actuation, and to cause said vacuum chamber to be advanced distally in response to a second actuation, said second actuation causing a vacuum to be generated in said inner cannula and delivered through said lumen to the tissue receiving aperture and said outer cannula to be advanced distally over said previously fired inner cannula and away from said housing, whereby tissue drawn into said tissue receiving aperture of said inner cannula by said vacuum is severed.