Surgical instrument

A device comprising an electrosurgical system for morcellating tissue within a body cavity of a patient, the morcellating device comprising:

• an electrosurgical generator,
• a morcellating device, and
• a tissue-pulling device,
• the morcellating device comprising:
• a stationary tube having a distal end,
• a bipolar electrode assembly including first and second electrodes located at the distal end of the tube, the first electrode being an active electrode, and the second electrode being a return electrode,
• an insulation member positioned so as to separate the first and second electrodes from one another, and
• first and second cables for connecting the first and second electrodes to first and second poles, respectively, of the electrosurgical generator,
• the tissue-pulling device being locatable within the tube and including:
• a pair of jaw members movable between open and closed positions, and
• a third cable for connecting the jaw members to the first or second pole of the electrosurgical generator so that the jaw members are, together, an additional, third electrode,
• wherein, when an electrosurgical cutting voltage is applied to the electrode assembly and/or tissue-pulling device, the tissue-pulling device can be moved to pull tissue against the distal end of the tube so that the first, second and/or third electrodes sever the tissue to form a core of severed tissue within the tube, and further moved to remove the severed tissue from the body cavity of the patient.