Rescuers have long monitored patients' breathing tubes for carbon dioxide to make sure the device was correctly placed in the windpipe instead of the esophagus.
In addition to other possible uses, Patwari wants to conduct research with doctors to test his method as an infant-breathing monitor, and, if it proves useful, develop it as a medical device that would need federal approval.
Each device plugs into Apple's iPad, iPhone or iPod Touch, and digitally monitors heart rate and breathing patterns, offering on-screen coaching to get you into a calmer zone.