A cannula assembly includes a housing supporting a seal assembly, a cannula shaft extending from the housing, and a sleeve positioned about the cannula shaft including an inner fixation device that is supported on a distal end of the cannula shaft. The inner fixation device includes an anchor member that is deployable within a body cavity to obstruct withdrawal of the cannula assembly from within the body cavity. The anchor member is formed of a material that will deactivate or allow removal of the catheter assembly from the body cavity when the anchor member is deployed and an excessive force is applied to the cannula assembly to prevent ripping or tearing of tissue.
