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I saw a neat new toy for technical divers on Sunday - a portable,
inexpensive (around $500) doppler detector called "Dopplex."  Originally
made for obstetrics applications, the Dopplex can be used to detect N2 bubbles 
in the venous blood that may be associated with subclinical DCI.  Randy Bohrer
sells them through his company, Underwater Applications Corp. of Nashua, NH.

Randy brought one along for Sunday's dive on the bow section of the Chester
Poling, a wreck in about 180 fsw off Gloucester, MA.  Divers did profiles
ranging from 15-25  minutes on 18/40 trimix, and 20-25 minutes on air.  None of
the divers on mix  had detectable bubbles, whereas one of the air divers did
have audible  bubbles (but no apparent symptoms).

One of these devices could probably be useful in judging the conservatism of
a decompression procedure for a particular individual, to determine whether 
adequate safety factors have been used.  One flaw with this particular device
is that it apparently does not come with either instructions or training for
use in diving applications.  Whether Randy is developing his own is unclear.

jheimann@sc*.gt*.co*

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