Background: Critically ill patients occasionally require a tracheostomy tube to breathe. A percutaneous tracheostomy can be performed, where a needle/catheter is inserted into the trachea, followed by insertion of a guidewire and a tube that dilates the tissue, creating a hole for the tracheostomy tube. Although this is a common procedure, it does pose risks to the patient, including accidental puncture of nearby structures. We wish to test a device that alerts the doctor to when the needle tip is in the tracheal lumen. The device has been proven to aid needle insertion in cadavers, but it needs to be tested on live patients. Since many intensive care patients undergo PT, we wish to test our technique on this population.