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I thought that anyone on O2 was supposed to monitored continuously and not left alone. If that is the case then why remove the one valve...?? On 3 Apr 98 at 18:53, DOUG MATHIESON wrote: > Date: Fri, 03 Apr 1998 18:53:29 -0500 > From: DOUG MATHIESON <mathieson@go*.ne*> > To: Steve Lindblom <s_lindblom@co*.co*> > Cc: techdiver@aquanaut.com > Subject: Re: DECO help > > > Steve Lindblom wrote: > > > >By using the partial mask , which has one of the one way valves removed, if > > >the oxygen supply becomes depleted the patient will still be able to breathe > > >through the open port > > > > I think you've got the partial rebreather confused with the modified non- > > rebreathers that seem to be all you can buy these days. The difference > > between a non-rebreather and a partial rebreather is that the non- has a > > one way valve between the reservoir and the mask, so none of the exhalation > > goes back into the reservoir. A partial rebreather doesn't and can't > > provide more than 60% no matter what the flow. > > > > Unfortunately, for the reasons you mention, the non-rebreather masks > > available have been modified by putting the air vent in place of one of the > > two exhalation valves they used to have > > > > This is probably a good idea in general, but not for dive/DCS treatment, > > where achieving a high PO2 is more important than it is in most other > > emergency situations. > > > > The other problem with the vent is that, along with making it impossible to > > obtain FO2's over 90% or so, it requires really cranking up the flow to get > > even that. Once again, not a problem for med/EMT types, who have unlimted > > O2 on hand, but a drag with a single D tank and an hour from shore. > > > > The OXY HACKER suggests pirating a valve from another mask and fitting it > > to the non-rebreather mask in your dive O2 kit, taping over the air hole, > > or covering it with a finger in order to get the highest possible FO2. > > > > If anyone knows of a source of the old style masks without the hole, let > > us know - I'd really like to get some. It's too bad DAN won't address this, > > considering how they are always going on about how critical that last 5-10% > > of O2 is. > > > > -- > > The mask we are using in Canada is what i believe you are calling a > modified non rebreather. there is a oneway valve between the reservoir > bag and the mask and two valves on the mask with one removed to let in > room air in case your tank runs dry. > > It is simple enough to attach a tab to the open port if you really want > the extra O2 % which i certainly would be doing with DCS or a bad CHF > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > Cheers Tony -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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