5 ms·

Here's a start: http://www.kickstarter.com/projects/1342192419/pulse-sensor-an-open-source-heart-rate-sensor-that http://www.kickstarter.com/projects/134219241

by mtraven 14y ago

Here's a start: http://www.kickstarter.com/projects/1342192419/pulse-sensor-an-open-source-heart-rate-sensor-that http://www.kickstarter.com/projects/1342192419/pulse-sensor-... CPAPs aren't exactly super hi-tech either, and since they are fairly noninvasive as medical tech goes I can easily imagine some people experimenting with homebrews...

masonhensley 14y ago
Link to buy now because the kickstarter is over... $20 http://pulsesensor.myshopify.com/ http://pulsesensor.myshopify.com/
ars 14y ago
CPAP can be dangerous actually. First if the power goes out the person can suffocate. The masks have small holes in them for this reason (basically a permanent leak). A MUCH MUCH more dangerous hazard is re-breathing. In a properly designed machine if it fails (power outage or mechanical) it will have a strong resistance to air flow - this lets the small holes take over. But if air flow is not blocked then the person will breath the same air over and over in the tube (the same air will flow back and forth) and will eventually asphyxiate. Another hazard is if the pressure goes up too high, this can cause injuries. The fact that you are not even aware of these hazards is probably a good reason not to try building one. And there may be more hazards I have not thought of.
- shrike 14y ago
  All masks come equipped with an anti asphyxia valve. They are a very simple flap that fails open in the case of a power outage or other failure, a (C|A)PAP mask cannot asphyxiate you. [1] https://encrypted.google.com/search?hl=en&q=anti%20asphyxia%20valve https://encrypted.google.com/search?hl=en&q=anti%20asphy...
  - ars 14y ago
    Only full face masks do. The nasal ones don't. Technically you could breath through your mouth if there was a problem, but some people have issues keeping themself from breathing through their mouth, so they use a chip strap to prevent it. And then this hazard comes into play. And you entirely missed my point. The masks are safe because someone thought of the hazard and designed against it. If you are making things homebrew you better make sure you are aware of all the hazards.

by mtraven 14y ago

masonhensley 14y ago

Link to buy now because the kickstarter is over... $20 http://pulsesensor.myshopify.com/ http://pulsesensor.myshopify.com/

ars 14y ago

CPAP can be dangerous actually. First if the power goes out the person can suffocate. The masks have small holes in them for this reason (basically a permanent leak). A MUCH MUCH more dangerous hazard is re-breathing. In a properly designed machine if it fails (power outage or mechanical) it will have a strong resistance to air flow - this lets the small holes take over. But if air flow is not blocked then the person will breath the same air over and over in the tube (the same air will flow back and forth) and will eventually asphyxiate. Another hazard is if the pressure goes up too high, this can cause injuries. The fact that you are not even aware of these hazards is probably a good reason not to try building one. And there may be more hazards I have not thought of.

shrike 14y ago
All masks come equipped with an anti asphyxia valve. They are a very simple flap that fails open in the case of a power outage or other failure, a (C|A)PAP mask cannot asphyxiate you. [1] https://encrypted.google.com/search?hl=en&q=anti%20asphyxia%20valve https://encrypted.google.com/search?hl=en&q=anti%20asphy...
- ars 14y ago
  Only full face masks do. The nasal ones don't. Technically you could breath through your mouth if there was a problem, but some people have issues keeping themself from breathing through their mouth, so they use a chip strap to prevent it. And then this hazard comes into play. And you entirely missed my point. The masks are safe because someone thought of the hazard and designed against it. If you are making things homebrew you better make sure you are aware of all the hazards.