STEERABLE STYLET WITH ENHANCED TORSIONAL TRANSFER STRENGTH

摘要

A steerable guidewire or stylet (2) that has increased torsional strength is disclosed. A braided structure located in the vicinity of the distal end of the guidewire or stylet provides for a more efficient transfer or rotational force over the length of the guidewire or stylet provides for a more efficin et tansfer of rotationnal force over the length of the guideire or stylet. The stylet inlcudesan outer member, and a pull-wire coupled to the distal tip of the outer member such that when tension is applied to the pull-wire, the distal tip of the outer member is deflected. The distal tip of the outer member may be formed of a material having superelastic properties whereas th e proximal portion of the stylet may be formed of a material having more torsional strength. According to another aspect of the invention, a handle ( 4) is provided that includes both rotatable and slidable mechanisms to facilita te deflection of the distal tip portion of the outer member.