US 10,376,180 B2
Methods and systems for verifying and monitoring endotracheal tube position during intubation
John C. Victor, Kunkletown, PA (US)
Assigned to TELEFLEX MEDICAL INCORPORATED, Morrisville, NC (US)
Filed by TELEFLEX MEDICAL INCORPORATED, Research Triangle Park, NC (US)
Filed on Mar. 14, 2014, as Appl. No. 14/213,339.
Claims priority of provisional application 61/784,043, filed on Mar. 14, 2013.
Prior Publication US 2014/0275958 A1, Sep. 18, 2014
Int. Cl. G01D 5/14 (2006.01); A61B 5/06 (2006.01); A61M 16/04 (2006.01); A61B 1/267 (2006.01)
CPC A61B 5/065 (2013.01) [A61M 16/04 (2013.01); A61M 16/0411 (2014.02); A61B 1/267 (2013.01); A61B 2562/02 (2013.01); A61M 2205/0272 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of positioning an endotracheal tube in a patient for intubation, the method comprising:
providing a sensing device;
directing a distal tip end of the endotracheal tube through a glottis, the distal tip end having a magnet embedded in a lumen wall of the endotracheal tube;
positioning the distal tip end at a home position in a mid-trachea region of the patient;
affixing the sensing device just above or at a sternal notch of the patient, wherein the sensing device includes a first Hall sensor and a second Hall sensor positioned at a predetermined distance from the first Hall sensor;
reading with the sensing device an intensity of a magnetic field produced by the magnet using the first Hall sensor and the second Hall sensor;
receiving, with a display device in communication with one or more processors, signals from the first Hall sensor and the second Hall sensor in the sensing device corresponding to a voltage output that is sensitive to an intensity of the magnetic field;
defining, with the one or more processors, any point on the endotracheal tube according to a longitudinal coordinate along a length of the endotracheal tube and a corresponding radial coordinate along a circumference of the endotracheal tube using a cylindrical coordinate system;
establishing a home position of the sensing device and applying a radius polynomial for the endotracheal tube to the Hall sensor readings established for the home position of the sensing device, setting a home longitudinal reference value for each of the Hall sensors and a home angle reference value indicative of a relative rotation of the endotracheal tube with respect to each of the Hall sensors;
determining, with the one or more processors, a longitudinal displacement of the endotracheal tube relative to the home position of the sensing device based on signals of successive sensor readings of the first and second Hall sensors;
determining, with the one or more processors, a radial displacement of the endotracheal tube relative to the home position based on the signals of the successive sensor readings of the first and second Hall sensors when the magnet is anteriorly aligned with both the first and second Hall sensors, and
displaying, with the display device, a display corresponding to at least one of the longitudinal displacement and the radial displacement.