Biopsy device with motorised needle cocking and firing mechansim

摘要

A biopsy device includes a needle having a tissue piercing tip and a transverse aperture proximal to the tip and a cutter configured to sever tissue protruding through the aperture. The needle may be fired into tissue by a needle firing mechanism (240), which may include a fork (250) for holding the needle and a firing rod (248) coupled with the fork. A spring (254) urges the fork to a distal, fired position. A screw gear (258) is coupled with the rod. A sled (256) is positioned at the proximal end of the rod. A catch (266) is configured to engage the sled when the sled is moved to a proximal position. The screw gear is operable to convert rotational motion from a motor (246) and gear set into linear motion to move the rod proximally to engage the sled with the catch, thereby cocking the needle firing mechanism. The motor may also be used to translate the screw gear distally relative to the rod after the sled has engaged with the catch. A trigger (242) is used to fire the cocked needle firing mechanism.