Patent ID: 7828775

Claim:
A surgical portal apparatus for insertion through a body cavity wall comprising: an elongate inner member defining a longitudinal bore dimensioned to permit introduction of a surgical object therethrough, the elongate inner member having a distal end, a proximal end and a length therebetween; an elongate outer member radially surrounding at least a portion of the length of the elongate inner member; at least one of the elongate inner member and the elongate outer member including a length adjustment structure having a generally helical thread and the other of the inner member and the outer member including an engagement element for engaging the generally helical thread to permit longitudinal translation between the elongate inner member and elongate outer member during relative rotation thereof; and a length fixation structure including inter-engaging components for selectively securing a longitudinal position of the elongate inner member within the elongate outer member to prevent unintended longitudinal migration therebetween, wherein at least one of the inter-engaging components is disposed on the engagement element for engaging the generally helical thread.