A medical guidewire includes a flexible spiral coil,a fiber, and a strengthening element. The coil isconfigured to guide a medical device into a patient body.The fiber extends along at least part of the coil, iscoupled to the at least part of the coil at one or morefirst predefined locations and is configured tomechanically strengthen the at least part of the coil.The strengthening element is coupled to one or moresecond predefined locations along a distal section of thecoil, and is configured to mechanically strengthen thedistal section.