A medical device for engaging tissue, the medical device comprising: a housing defining an internal passageway and a longitudinal axis extending between proximal and distal ends of the housing, the housing defining first and second guide surfaces (82, 84) along the internal passageway; a first jaw slidably and pivotally connected to the housing, the first jaw having proximal and distal ends (60, 64), the first jaw being slidably received within the internal passageway for longitudinal movement along the first guide surface between an extended position and a retracted position; a second jaw slidably and pivotally connected to the housing, the second jaw having proximal and distal ends (62, 66), the second jaw being slidably received within the internal passageway for longitudinal movement along the second guide surface between an extended position and a retracted position; wherein the housing is structured to block rotation of the first and second jaws (44, 46) when they are in their retracted positions, and wherein the housing is structured to permit rotation of the first and second jaws (44, 46) when they are in their extended positions; and a driver engaged with the proximal ends (64, 66) of the first and second jaws (44, 46), wherein longitudinal movement of the driver moves the first and second jaws longitudinally along the first and second guide surfaces (82, 84) between their retracted and extended positions characterized in that the proximal ends (64, 66) of the first and second jaws (44, 46) include geared teeth (68, 70), and the driver includes corresponding teeth that mesh with the geared teeth (68, 70) of the jaws (44, 46), wherein longitudinal movement of the driver rotates the first and second jaws (44, 46) relative to the housing when the first and second jaws (44, 46) are in their extended positions. a housing defining an internal passageway and a longitudinal axis extending between proximal and distal ends of the housing, the housing defining first and second guide surfaces (82, 84) along the internal passageway; a first jaw slidably and pivotally connected to the housing, the first jaw having proximal and distal ends (60, 64), the first jaw being slidably received within the internal passageway for longitudinal movement along the first guide surface between an extended position and a retracted position; a second jaw slidably and pivotally connected to the housing, the second jaw having proximal and distal ends (62, 66), the second jaw being slidably received within the internal passageway for longitudinal movement along the second guide surface between an extended position and a retracted position; wherein the housing is structured to block rotation of the first and second jaws (44, 46) when they are in their retracted positions, and wherein the housing is structured to permit rotation of the first and second jaws (44, 46) when they are in their extended positions; and a driver engaged with the proximal ends (64, 66) of the first and second jaws (44, 46), wherein longitudinal movement of the driver moves the first and second jaws longitudinally along the first and second guide surfaces (82, 84) between their retracted and extended positions characterized in that the proximal ends (64, 66) of the first and second jaws (44, 46) include geared teeth (68, 70), and the driver includes corresponding teeth that mesh with the geared teeth (68, 70) of the jaws (44, 46), wherein longitudinal movement of the driver rotates the first and second jaws (44, 46) relative to the housing when the first and second jaws (44, 46) are in their extended positions.