Hi Jnette!
That ethyl chloride spray sounds wonderful! So I did some searching on the internet for information about the spray. Figured I could print it off and pass it along to the head nurse as something we could possible implement at our clinic. Well my search yielded some interesting results.
Ethyl chloride is a refrigerant that is used for variety of things, one of which is a local anesthetic. It works by literally freezing the skin. But it must be applied carefully, as it could actually frost the skin, killing tissue. Surrounding tissue must be protected with patroleoum jelly. Inhalation of this substance could cause some problems, and it also flammable. It is also listed as a hazardous material.
However, it obviously is used in the medical setting. I wounder, though, if it would be apropriate for routine usage in a dialysis clinic, given the fact the the majority of cannulations are done by non-licensed personnel. But is is less expensive than Emla cream. This stuff is about $27.00 per bottle.
Here's the site where I got the info:
http://www.chaseunion.com/documents/PDS/ethylch1.html