Just thought I'd post since I did a thread search and didn't get any response for "collagen". Since I have a vacation coming up, we tried a collagen injection at the mouth of the bladder to see if it would help with retention. The surgeon said she will use that with older patients who have continence problems, but aren't good surgery candidates. She warned me that at best it is usually only good for about 3 months, 6 months tops.
Well, it may have been worth a shot, but did nothing for me. It really didn't help at all. It's an outpatient procedure, general anesthesia. It was pretty mild painwise afterwards, but felt weird to be swollen "down there". Just as with a cystoscopy, it was a bit sore urinating the first couple of days. Once that initial swelling was gone, though, the leakage was back.
One other thing I noticed right after the injections was that I urinated more slowly, but it went in a more diffuse stream, which I wasn't too happy about. Any effect at all seemed to disappear within a week or so, so my own experience is that it wasn't worth it.
Nancy D-ACDF 6/2/02, bladder suspension 12/06, sarcoidosis 10/07, TKR 9/3/13