Latching mechanism for in-line activated electrosurgical device

A surgical device, comprising:

• a housing having a stationary handle and a movable handle pivotally supported by the housing and pivotable between an unactuated position, a first actuated position, and a second actuated position;
• an elongated shaft extending distally from the housing and defining a longitudinal axis;
• an end effector supported by a distal portion of the elongated shaft, the end effector having a pair of opposed jaw members movable between an open configuration in which the jaw members are spaced apart from one another and a closed configuration in which the jaw members are closer together;
• and
• an actuation mechanism configured to transition the end effector between the open configuration and the closed configuration as the movable handle is pivoted between the unactuated position and the first actuated position and to maintain the end effector in the closed configuration when the movable handle is pivoted between the first and second actuated positions, wherein the actuation mechanism includes a first actuation link, a second actuation link, and a third actuation link, the first actuation link rotatable about a first portion thereof that is secured within the housing and including a second portion of the first actuation link movable in an arc in response to rotation of the first actuation link, the second actuation link including a first portion pivotally coupled to the second portion of the first actuation link and a second portion of the second actuation link including a cam disposed within a cam slot defined in a track attached to the housing, the third actuation link including a first portion pivotally coupled to the second portion of the second actuation link and a second portion of the third actuation link coupled to a collar translatable along the longitudinal axis to transition the end effector between the open and closed configurations,
• wherein in the unactuated position of the movable handle, the cam is positioned on a first side of the longitudinal axis and in the first actuated position of the movable handle, the cam is positioned on a second side of the longitudinal axis.