| 摘要 |
<p>A medical guidewire (10) has an elongated body that has a degree of flexibility and a distal tip region of relatively greater flexibility. The guidewire consists of a core (12) having a body (32) of first diameter, a distal portion of a relatively smaller diameter, and a generally flat distal end. The end is disposed in the tip region (34) and is spaced proximally from a round tip element (22) that defines the distal end of the guidewire. A first coil (14) is jointed ot the core body and extends along the core to a termination point in the distal tip region, proximal of the end of the core. A relatively more flexible second coil (18) is joined at its proximal end to the first coil and joined at its distal end to the round tip element. A safety wire (24) is secured to the core and has a generally flat distal end within the second coil, joined to the round tip. A transition wire (26) is secured to the core and has a generally flat distal end that terminates within the second coil intermediate of the distal ends of the core and safety wire. In this or other medical guidewires, the first and second coils are joined in sequence, the second coil overlapping the first coil, both having essentially the same outer diameter. The above resulting in a joint of substantially uninterrupted flexibility.</p> |
