Caution re taping mouth & no CO2 exit

[roster]

I suppose this is not the right thread to ask what kind of tape to use...

Here are some tips on mouthtaping including one recommendation on tape - viewtopic.php?t=9653&

[BigNortherner]

GumbyCT: please read the messages not the headline which I chose because the two subjects are related - the essential is to get enough oxygen, either might prevent that, the need is for knowledge applied. The point about the mouth being available is not that it is the preferred CO2 vent but a source of more oxygen if needed, and not taped.


I should note that the mask that appeared to have been used without a CO2 vent was a nose mask, so presumably the user had a mouth to open in case of substantial problem breathing enough oxygen through the nose.
It also had holes to inject oxygen but the plugs were in place - removing them would provide a vent.

I've seen the mask design elsewhere, an experienced user who had moved on to something else, I don't recall if he had the swivels. My guess is that it is cheap, for hospital use where it is discarded when the patient no longer needs it.

[BigNortherner]

Quick note re the F&P 431 mentionned a lot herein (deserves its own thread).

F&P are at least two models along from it, with attempts to do better on the seal and forehead, though they still claim they don't need a full adjustable forehead pad. (I need a thick pad on the 431, else the mask tips around my upper nose as a fulcrum, putting pressure there and making sealing at the mouth more difficult.)

Unfortunately, by my reading, the cushion assembly from the 432 will not fit the 431.

[BigNortherner]

I started a new thread with information on the F&P 431-432-Forma full-face mask design. Here I talk about its anti-asphyxiation feature.
.
An interesting feature of the 431-432-Forma design is that it has two vent methods. In addition to an array of holes high in the shell there are two flaps in the hose swivel, oriented so that exhaled air flows out two holes when it overcomes machine pressure but those holes are closed during inhaling. I like that. And note it gives redundancy of venting, to a significant degree, as a full face mask covers all breathing orifices (and that F&P design has a chin-restraining lip).

The ResMed Mirage Ultra does not have the extra vent/valve, only conventional vent holes high up on the mask.

[BigNortherner]

Another risk consideration is when oxygen is used. Some manufacturers offer check valves in the airflow path to try to keep oxygen out of the machine.

Materials in oxygen rich air are much more flammable than in ordinary air, thus risk level is high – especially as there is an open source of oxygen in this case.

One example of a valve: http://www.cpap-supply.com/M-Series-Hos ... 051168.htm
http://www.cpap-supply.com/CPAP-Pressur ... 302418.htm

[BigNortherner]

Oops, re oxygen risk, only http://www.cpap-supply.com/CPAP-Pressur ... 302418.htm I gave a check valve, the other URL is a simple elbow.

Oxygen is a whole subject, presumably the user gets some advice handling it.