Not quite in the same situation as you were but there may be some similar issues.
Sorry to hear of you continued problems. The hem-o-lok clips Gordon mentioned are to seal blood vessels during the da vinci op they do drop off and and settle in the pelvic area but as in my case one migrated into the bladder and two of them migrated into the urethra, all on separate occasions over a couple of years, they are not used on the joint. The anastomosis is joined using a suture sometimes it is a barbed suture to prevent anything slipping. Again as said, the joint is tested to make sure it is watertight.
My DaVinci was recorded and I assume that it is standard practice and your surgeon may be able to go back and look at the op.
Bladder neck Strictures at the anastomosis in the urethra are caused for several reasons,over tightening the sutures and urine leaking through the joint, your surgeon probably spent an hour on that joint.
My surgeon is convinced that the trauma of pulling the Catheter out when it got stuck caused my ongoing problems.
We all are different and I am not suggesting you will suffer the same issues as myself,have a look at my profile and links to conversations.
I know If I have to have uretheral reconstruction they will go in via the perineum. In you case I am not sure if they can go back in using the same route as the original Da Vinci.
I can only assume they are confident the joint will heal in the next few weeks and I hope all goes well.