Medical tube position confirmation system

A medical tube position confirmation system for confirming the position of a medical tube that is used to supply nutrients to an interior of a body while an end portion thereof is inserted into the stomach of the body, the system comprising:

• a light guide that is configured to guide light entering through an incident end portion so that the light exits through an exit end portion, and is configured to be insertable into the medical tube so that the exit end portion is disposed in the interior of the stomach;
• and
• a light source that is configured to be optically connected to the incident end portion of the light guide and to emit light containing wavelengths containing wavelengths that pass through a living body,
• wherein the light source is configured to emit light at an intensity that equals or exceeds a first intensity required for light to pass from the interior of the stomach to the exterior of the body but is lower than a second intensity required for light to pass from the interior of the lungs and trachea to the exterior of the body.

A method of confirming the position of a medical tube that is used to supply nutrients to an interior of a body while an end portion thereof is inserted into the stomach of the body, of the method comprising:

• inserting a light guide configured to guide light entering through an incident end portion so that the light exits through an exit end portion into the medical tube by a predetermined length, starting with the exit end portion;
• optically connecting a light source that emits light containing wavelengths that pass through a living body to the incident end portion of the light guide;
• and
• causing the light source to emit light,
• wherein the light source is set to emit light at an intensity that equals or exceeds a first intensity required for light to pass from the interior of the stomach to the exterior of the body but is lower than a second intensity required for light to pass from the interior of the lungs and trachea to the exterior of the body.