Patent ID: 8606347

Claim:
A method of controlling a display device for confirming placement of a catheter inserted into a subject after the catheter is inserted through a nasal or oral cavity of the subject, wherein the catheter has a tip positioned in a jejunum of the subject, the method comprising: (a) storing data representative of a reference image in a data storage device; (b) displaying on the display device the reference image, the reference image including: (i) a vertical line representing a mid-sagittal line of the subject, and (ii) a horizontal line representing a vertical cross-section of a diaphragm of the subject, wherein the vertical line and horizontal line intersect at a point representative of a xiphoid process of the subject; (c) storing instructions which, when executed by a processor, cause the processor to generate a graphical representation of an insertion path of the catheter, which includes a coil inserted into the catheter that is detected by a detector positioned over a predetermined location of an anterior surface of the subject for detecting a position of the coil; and (d) displaying on the display device, in three-dimensions, the graphical representation of an insertion path of the catheter, wherein confirmation of placement of the catheter in the subject is enabled based on the graphical representation of the insertion path, and wherein the graphical representation of the insertion path defines a shape including: (i) an esophageal segment extending substantially parallel to said vertical line, the esophageal segment extending from a position above the horizontal line to the horizontal line and having a first depth relative to the anterior surface of the subject, the esophageal segment indicating absence of placement in an airway of the subject, (ii) a stomach segment extending from said vertical line abaxially away from the vertical line, returning axially to the vertical line and having a second depth relative to the anterior surface of the subject, (iii) a pylorus segment intersecting the vertical line at a third depth relative to the anterior surface of the subject, (iv) a duodenum segment extending abaxially away from the vertical line in a direction substantially opposite from the stomach segment, returning axially to the vertical line and having a fourth depth relative to the anterior surface of the subject, and (v) a jejunum segment extending abaxially away from said vertical line in a direction substantially opposite the duodenum segment, the jejunum segment terminating in a location representing the jejunum of the subject.