There is provided an apparatus for use in a bodily lumen. The apparatus comprises a guidewire and a catheter. The guidewire has a proximal end portion and a distal end portion, The catheter has a proximal end portion and a distal end portion. The catheter includes a lumen for receiving the guidewire. The catheter is configured to be translated along the guidewire. The catheter is configured to be biased towards a translated position along the guidewire by a magnetic attraction between the guidewire and the catheter.
