Patent ID: 7828747
Filing Date: 2010-11-09
Classification: A61B

Abstract:
1. A biopsy device, comprising: a cylinder with a cylinder wall, a cylinder floor and an open end, and a piston able to move within the cylinder; the cylinder having a wheel with a spindle nut; a ventilation groove formed in the interior of the cylinder wall only to a depth of a portion of a thickness of the cylinder wall, the ventilation groove extending toward the wheel of the cylinder, the ventilation groove being configured to provide an airflow bypass of the piston as the piston passes over the ventilation groove; the piston having a spindle that engages the spindle nut; a motor drive that engages the wheel to rotate the wheel, thereby rotating the spindle nut and in turn moving the piston; and a biopsy needle connected to the cylinder to selectively form a vacuum and an overpressure in the biopsy needle when the piston is moved.