Given that it has only been an option for the daVinci system for a little over a year now, I think that is a pretty good percentage. Also, given that Spy has focused on plastic reconstruction, obviously not done with daVinci, and that SpyScope has not yet been launched in an arena (colorectal) where daVinci might be used, my sense is the awareness of the surgeons using daVinci hasn't kicked in, yet. As the indications that daVinic is used for expands and the reputation of Firefly/Spy expands, I assume the rate of Firefly being included in system sales will expand. Also, I assume that the hospitals can also purchase Firefly later - it doesn't have to be part of the original system purchase.
I think that NVDQ is counting on ISRG to drive adoption in colorectal rather than the other way around. Colorectal is still an early (low volume) procedure for ISRG, albeit a rapidly growing one. As I undestand it, FireFly is used in only a fraction of those cases. I think in the not too distant future colorectal will be a strong contributor for ISRG and that FireFLY will be used on virtually every colorectal procedure.