Tube Positioning System Designed for Nasogastric Intubation
In this paper, a 915-MHz tube positioning system designed for nasogastric intubation has been proposed and demonstrated. The system consists of an in-body transmitting tag and an off-body handheld sensor. The handheld sensor is designed based on the dynamic monopulse radar technique to moderate tissue interference. It can be powered by batteries with an overall power consumption of 1.5 watts. For easy access and display, the MCU and Bluetooth modules are employed to transmit the measurement results to the smartphone. The measurements conducted with ground pork show that the proposed system can successfully detect the tag that is buried 7.5 cm underneath the surface.