Hi Ginnie,
Try:
infusion catheter epidural
This article is (IMO) pretty good; I generally like
PPM.
Infusion Catheter Epidural
I don't recall any discussions here either; the archives turn up a half dozen or so posts, but they don't appear pertinent. I don't seem to find too many discussions on it except a few older ones on Usenet (now Google Groups).
Doc