A surgical vascular introducer sheath comprising first and second members and a retainer. The first member has a lumen for receiving a surgical instrument therethrough and a first side opening in an outer wall in fluid communication with the first lumen. The second member has a lumen and a side opening in fluid communication with the second lumen, wherein at least a portion of the first member is positioned within the second lumen of the second member. The retainer is positioned at a distal portion of the first member and is movable from a first retracted position to a second extended position to limit proximal movement of the introducer in response to movement of the first member.