Method for manufacturing a magnet and systems and devices including a magnet

A method, comprising:

• drawing a set of materials to form a drawn filled tubing (DFT) wire, the set of materials including a core material, a biocompatible material, and a magnetic material, the DFT wire including a core formed of the core material, first and second layers formed of the biocompatible material, and a magnetic layer formed of the magnetic material disposed between the first and second layers of biocompatible material;
• applying heat to the DFT wire to melt away the core to form a magnet having the first and second layers and the magnetic layer with a through lumen, the core material having a lower melting temperature than the biocompatible material and the magnetic material;
• and
• cutting and placing at least a portion of the magnet on a microcatheter, a guide catheter, an ablation catheter, a navigation catheter and/or a therapeutic catheter such that the portion of the magnet can be used to steer the microcatheter, the guide catheter, the ablation catheter, the navigation catheter and/or the therapeutic catheter.