this invention is a surgical device . it is a guidewire for use in a catheter and is used for accessing a targeted site in a lumen system of a patient &# 39 ; s body . the guidewire may be of a high elasticity metal alloy , preferably a ni - ti alloy , having specified physical parameters , and is especially useful for accessing peripheral or soft tissue targets . a special variation of the inventive guidewire includes the concept of coating the wire with a one or more lubricious polymers to enhance its suitability for use within catheters and with the interior of vascular lumen . the &# 34 ; necked &# 34 ; guidewire tip also forms a specific variant of the invention .