Hi Frogga sweetie,

Just a quickie- yes, here:

This was the first one tried in 2001, successfully:

http://www.anesthesia-analgesia.org/...full/93/4/1032
© 2001 International Anesthesia Research Society
PAIN MEDICINE
The Long-Term Antinociceptive Effect of Intrathecal S(+)-Ketamine in a Patient with Established Morphine Tolerance
Abstract
IMPLICATIONS: Our report describes for the first time the continuous long-term intrathecal application of S(+)-ketamine in a patient with chronic pain and morphine tolerance. Intrathecally applied S(+)-ketamine led to a significant pain reduction and consecutively reduced the doses of intrathecal morphine required for pain relief even several weeks after the cessation of the 24-day period of intrathecal S(+)-ketamine administration.

Then go to: http://www.ncbi.nlm.nih.gov/sites/entrez
and put in a search for ketamine intrathecal. Among the rats and what-all they've tried it on, there are some entries for people too

And found a small blog entry (have to search intrathecal on the page) that shows it is being used privately, rather than for the several-day infusions.....
http://www.mylot.com/w/discussions/1153257.aspx

If there's that, there'll be others...just run out of time,

all the best