Patent ID: 8172869

Claim:
A method for creating a working space comprising: providing a surgical device including a housing and a cannula extending therefrom; inserting the surgical device through an incision in a patient's skin; inserting a tunneling rod guide into the cannula of the surgical device, the tunneling rod guide including: an obturator; a guide tube; and a guide collar including: an end collar disposed at a distal end of the guide collar and a first collar disposed on a proximal end of the guide collar, the guide collar transitionable between a first state defined by engagement of the proximal end of the guide collar with a first region of the first collar defining a first diameter and a second state defined by engagement of the proximal end of the guide collar with a second region of the first collar defining a second diameter different from the first diameter; moving the obturator and the guide tube relative to each other such that the guide collar expands and frictionally engages an inner surface of the cannula; advancing the obturator distally such that a blunt tip of the obturator separates layers of tissue; removing the tunneling rod guide; removing the surgical device from the incision.