VASCULAR GUIDEWIRE SYSTEM

摘要

A vascular guidewire in an embodiment of the present invention, having such features as uniform diameter, low-profile cross section over its length and a distal tip capable of deflection and variable configurations, provides a range of advantages. A variable distal tip of shape-memory alloy deflects into varied configurations when remotely actuated. Such actuation, according to an aspect of the present invention, can be by way of a side entry, easily repositioned, single-handed controller that allows both rotational control of the guidewire and control of the variable tip. In another aspect, a longitudinal element in the guidewire, such as an exterior wire wrap, can provide dual functionality including structural support as well as an electrical path for use in energizing, and thus deflecting, the distal tip. In yet another aspect, the overall guidewire geometry having constant circumference and low profile, as well as side-access controllability, permits advantageous coaxial mounting and removal of catheters over the proximal guidewire end and facilitates insertion and removal of guidewires through catheters in vivo.