MRI compatible interventional medical devices and related methods

A method of performing interventional medical treatment under MRI, said method comprising:

• placing a portion of a patient within an MRI system having a scanner such that a portion of a body vessel is located within the scanner;
• grasping a wire guide having a wire guide proximal end and a wire guide distal end and comprising a continuous core member, a continuous jacket disposed over and fully encapsulating the entire core member, and a marker disposed on the core member, the core member formed of a first metallic material and having a first length and an outer surface in contact with the jacket, the first length being between 50 centimeters and 350 centimeters, the jacket disposed over the marker and having a second length that is greater than the first length, and the marker formed of a second metallic material;
• inserting the wire guide distal end into said body vessel;
• advancing the wire guide distal end through said body vessel until the wire guide distal end is disposed at a first position within a first portion of said body vessel that is located within the scanner of the MRI system;
• grasping a medical device having a medical device proximal end and a medical device distal end and comprising an elongate member defining a lumen;
• passing the medical device distal end over the wire guide proximal end to dispose the wire guide proximal end within the lumen of the elongate member of the medical device;
• advancing the medical device distal end over the wire guide and into said body vessel until the medical device distal end reaches a point of treatment within said body vessel;
• manipulating the medical device proximal end to produce a manipulation of the medical device distal end at the point of treatment;
• operating the scanner of the MRI system to scan the portion of the patient that is positioned within the scanner and that includes the first portion of the body vessel;
• obtaining a magnetic resonance image of the first portion of the body vessel;
• withdrawing the medical device from the body vessel;
• and
• withdrawing the wire guide from the body vessel.