I think I have found the surgical tool that fits the bill.
I think it is a Lithotomy knife and scoop. Originally I thought it was for removing bullets, but I couldn’t quite understand why it would be so sharp, on the probe end.
If I understand correctly, in those days, the surgeon pierced the wall of the bladder, then scooped out the stones, sometimes breaking them up first. The knives they used seemed to be only forward cutting. In this case it might be designed to perforate the wall and then stretch open the whole, after turning the tool the scoop would be used. The scoop was especially useful when the stones were small, or had been broken into small bits, also if the pieces were adherent or encysted in the wall. Which explains why the edge of the scoop is relatively sharp. I found a reference by John Ashhurst which said “every distinguished lithotomist has devised some special for of instrument, which bears his name”. He goes on to say that he uses a probe-pointed knife. Curiously enough I have a large collection of things from the Ashhurst estate. One example I found was paired with a gynecological scoop, which was somewhat similar. These tools were commonly made from silver.
This book shows one, which seems to have one bowl at the same angle, and the size is roughly the same.
http://books.google.com/books?id=kkAgfR ... 0scoop&f=fMaurice