Patent ID: 8287465

Claim:
A biopsy apparatus, comprising: a pressure and vacuum generator including a first cylinder and a first piston movably disposed within the cylinder, wherein the cylinder has a pressure generating region and a vacuum generating region; an outer cannula; an inner cannula having a lumen; a hydraulic actuator operably coupled to the inner cannula; a pressure accumulator including a first chamber fluidly connected to the pressure and vacuum generator and fluidly disposed between the pressure and vacuum generator and the hydraulic actuator; and a vacuum accumulator including a second chamber fluidly connected to the pressure and vacuum generator and fluidly disposed between the pressure and vacuum generator and the inner cannula, wherein the inner cannula is movably disposed within the outer cannula and the vacuum generating region is in one-way fluid communication with the inner cannula lumen to substantially prevent fluid from passing from the vacuum generating region to the vacuum accumulator, the pressure generating region is in one-way fluid communication with the pressure accumulator to substantially prevent fluid from passing from the pressure accumulator to the pressure generating region, the pressure accumulator is in selective fluid communication with the hydraulic actuator, and the vacuum accumulator is in fluid communication with the lumen.