Patent ID: 8231544

Claim:
A biopsy device, comprising: an outer member having a tip member and a cylinder lumen; a cylinder seal member fixedly attached to an inner surface of the outer member; a cannula seal member slideably engaging the inner surface of the outer member; an inner member having a sampling portion that defines a sampling cavity, an inner lumen, and an opening in fluid communication with the inner lumen, wherein the inner member is slideably disposed within the cylinder lumen through the cylinder seal member, the cannula seal member being fixedly attached to an outer surface of the inner member for concurrent movement therewith; the cylinder seal member and the cannula seal member defining a vacuum chamber, the opening in the inner member being disposed within the vacuum chamber; and the inner member and the outer member movable relative to one another between a retracted position, in which the tip member covers the sampling cavity and the vacuum chamber is expanded, and an extended position, wherein the sampling portion is extended away from the tip member to expose the sampling cavity and the vacuum chamber is contracted.