A surgical access device is disclosed that includes an access port having an elongated body with opposed proximal and distal end portions and defining a longitudinal axis, the body having a central lumen extending there through and having a resilient bulb portion formed between the proximal and distal end portions thereof, wherein the resilient bulb portion is adapted and configured to transition between a first condition in which the bulb portion has a first diameter and a first length and a second condition in which the bulb portion has a second diameter that is less than the first diameter and a second length that is greater than the first length, and wherein a telescoping guide tube assembly is disposed within the central lumen of the access port body for accommodating an elongated insertion device, wherein the guide tube assembly is adapted and configured to transition between a first length corresponding to the first condition of the bulb portion and a second length corresponding to the second condition of the bulb portion.