Patent ID: 7377902

Claim:
A system for accessing target tissue within a patient and isolating a body of target tissue from its supporting bed, comprising a. a biopsy device having a wand with a proximal portion and a distal portion, a housing on the proximal portion, an electrosurgical tissue cutting electrode secured to the distal portion of the wand, a first electrical conductor extending within the wand having a distal end electrically connected to the electrosurgical electrode and a proximal end configured to be electrically connected to an electrical power source, at least one deployable tissue contacting element connected to said distal wand portion and at least one driving member within the housing configured to move at least one deployable tissue contacting element of the biopsy device; b. a replaceable drive unit having a receptacle for engaging and releasably holding at least a portion of the housing on the proximal portion of the wand, and a driving element configured to engage the at least one driving member within the housing configured to transfer mechanical power to said biopsy device; and d. a motor unit for engaging and providing power to the driving element of the drive unit, comprising a securing mechanism effective to form a mechanically stable engagement between said motor unit and said drive element of the driving unit to transfer mechanical power therebetween.