Systems, apparatus, and methods for placing a guidewire for a jejunostomy tube

A method, comprising:

• translating a first end of an elongated tube through an orifice of a patient, through at least one of an esophagus or stomach of the patient, and into a jejunum of the patient such that an inflatable member and a magnetic member of the elongated tube are disposed in the jejunum of the patient,
• disposing an external magnetic assembly on a surface of the patient such that the magnetic member of the elongated tube is urged toward the surface of the patient and the inflatable member is disposed against an inner surface of a jejunum wall of the jejunum;
• and
• inflating the inflatable member via a lumen of the elongated tube such that the inflatable member transitions from an uninflated configuration to an inflated configuration.

A system, comprising:

• an elongated tube having a first end and a second end, the elongated tube defining a lumen configured to receive an endoscope such that the endoscope can translate the first end of the elongated tube to a target location within a patient;
• an inflatable member coupled to the elongated tube, the inflatable member configured to transition from an uninflated configuration to an inflated configuration;
• and
• a magnetic member coupled to the elongated tube, the magnetic member configured such that, in response to disposing an external magnetic assembly on a surface of the abdomen of the patient, the inflatable member can be urged against an inner surface of a jejunum wall of the patient to urge the jejunum wall toward the surface of the abdomen such that any intervening structure between the surface of the abdomen of the patient and the inner surface of the jejunum wall is disposed between the external magnetic assembly and the inflatable member with substantially no fluid gaps.