Robert Rolf wrote:

> Is it acceptable for the device to connect to a wall wart if a DPDT
> switch ensures that it is not possible for a patients electrodes to
> have a path to the AC outlet?

  I doubt very much whether a DPDT switch (remember, slide switches in
particular and rotary switches if so designed are frequently make-
before-break) would be anywhere near acceptable.

  Unless the wall-wart itself is rated for *full* isolation to the
relevant standards, I'd stick to the conventional approach of using
either a common receptacle into which you may plug *either* the charger
*or* the patient leads, or two receptacles with an exclusion shutter
which covers either one or other at any given time.
--
  Cheers,
        Paul B.