Ingestible Sensor to monitor breathing is currently being tested at MIT
As things stand, the current capsule stays within the body of the patient for two days before naturally passing out. The intention now, is to try and extend that duration of stay to at least 7 days. As far as the test patients are concerned, the sample set who received these capsules did not report any pain or discomfort and also said that sleeping with the capsule in their bodies was much easier that sleeping with the whole sensor setup wired to them.
The team working on this project are increasingly optimistic about the possibilities of this innovation and some even suggest that this capsule system could be used to administer drugs internally. This way, if there is a certain drug that must be administered at regular intervals, the quantity can be loaded into the capsule and the device can be coded to administer the required amount at the desired interval.
While this will require immense testing before being introduced into the mainstream hospitals, we are very excited to see how this eventually pans out.