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Hi, now I understand what you’re asking, when clinicians talk about it they are always talking about gauge pressure, that is the amount of the pressure that is above atmospheric. Somewhere in your

Is that measuring absolute pressure (ie relative to a vacuum) ? In physiology we use relative (to atmospheric) pressure (a process to "zero" the sensor is common) [email protected]> wrote:

I am playing with BMP now... it outputs 101,982.90 which makes sense (30.11 Inch of Mercury). However, 101,982.90 Pascals converted to cmH2O is 1039.936. How that scale fits in the requirement which

*We do NOT yet have a "final software" for FDA testing and submission.* It could still be ANYTHING.? ?We will know more after today's phone call. Early today I added the tidal volume limit

To Culyma group Keep up the good work ? [email protected]> wrote:

( A side note ) Thanks to a brilliant 16x2-Limited-Space-LCD observation by Dave LIzdas that the UNITS could be pasted below the LCD and therefore didn't need to take up precious real estate in the

I've made a first pilot effort at adding "assisted ventilation" to my little ventilator at home, with a bit of code added to vent_slice()? (see below) It is pretty crude, but it does indeed initiate

You probably already have this information. But, just in case it is of help, a link is in this message. /g/VentilatorDevelopers/message/1598 Good wishes on all your (and everyone's)

The oxygen sensors based on LED are reportedly unreliable. Dr.KP Prasad was narrating an incident yesterday when an expired patients oxygen was still showing 97% saturation! I will have the flow

Cool, that's even better...

I've seen designs where the O2 and Air valves were each activated for controlled time to mix the gasses. The advantage of the fuel injector is it could be pulsed many times in an inhalation cycle so

I did some research and found out that automotive suppliers actually produce special injectors for engines fueled by natural gas (CNG) or liquid petroleum gas (LPG). Though O2 molecules are smaller

Potential electronically controlled metering valve. See attached image of a typical automotive injector. --Ron [image: image.png] [email protected]> wrote:

I believe that a differential scheme using the fact that O2 (and O3) absorb significant amount of Far IR energy in the 9 to 10 um (a relatively narrow range) is used in some gas sensors. However, I

Measuring oxygen... Someone with a better background in this should check this basic premise, but the premise is that a pressure differential, across a constriction, measures volume flow. A mass

O2 level sensing is great when integrated into the ventilator solution with the appropriate transducer inputs. Alternatively, I wonder if accurate O2 blending could be accomplished via a "metering

The UF CSSALT Open Source Ventilator team is looking for free/pro-bono injection molding. If you are able to help us out or can connect us to someone who can, please reply to this post or email me at

Significant changes on Master branch as I merged "dev" to it. In master we now have: - Added stepper motor support - params array in PROGMEM saving ~300 bytes of RAM - LCD library optimization…

thanks for the complement! I suggest having a read of volume 3 and 4 Couple of points 1. oxygen blending needs to be moderately accurate - I'm yet to see a plausible solution to this that will not

My suggestion would be start with a clean slate. Valve disks that cycle on respiration (as opposed to back-up pressure relief valves) need to be very robust. Fabricating an appropriate disk from a