The "Shield-On" indicator means the blade is not exposed. The "Shield-off" indicator means that the blade is exposed.
Does this trocar have a lock?
Pressure from the palm of the hand during insertion serves as a "lock" to reveal the blade during insertion through the peritoneum. You will hear an audible click as the blade is revealed.
How is it supposed to feel as it is inserted?
Once through peritoneum, you should feel a change in tension and can remove pressure from your palm.
What sizes does this trocar come in?
What is the difference between the Versaport™ Plus V² and Versaport™ Plus RPF systems?
The differences are in the obturators. The cannula's and seal housings are essentially the same. RPF has a pyramidal blade and conventional safety shield, where as the V² has a V-shaped blade and parabolic-shaped safety shield.