1. What is the problem you are trying to solve?
2. Is there a market for this?
I really don't get if you are trying to make a PMV style check valve (breathe in but not out) or if you are looking to make a valve that leaves the trach open but closes it for speaking.
I can tell you that most patients who aren't already using the PMV style valves which are very sufficient for their purpose wouldn't be a good candidate for a full stoppage. Full stoppage of flow results in a partially blocked trachea and stacking that on top of expending energy to talk (which is way more than you can imagine) would wear out most people so much they wouldn't use the valve.
If you have a skype or IM hit me with an email at [REDACTED]. I have had a trach for 4.5 years now and gone from full ventilation to looking at decannulation. I'm a student in a Bachelors program for Mechanical Engineering Technology (4 year university degree) so I've considered the engineering solutions to my trach quite a bit. In fact I have some CAD models you might want to see in regards to related projects. I'd give you my phone but I'm in the USA so calling international would be kind of Blah.
Trach, Ventilator 6/2007
Last edited by bigalexe; 03-31-2012 at 01:59 AM.