Double loop lasso with single puller wire for bi-directional actuation

摘要

A catheter has a distal assembly with at least one loop, if not two, with ring electrodes. The distal assembly has an elongated support member covered by an extruded form having two lumens, one sized for nonslip tight fit with the support member. A single continuous puller wire for bidirectional deflection is pre-bent into two long portions and a U-shape bend therebetween. The U-shape bend is anchored at a distal end of a deflectable section which is reinforced by at least one washer having at least two holes, each hole axially aligned with a respective lumen in the deflectable section. Each hole is centered with a lumen so that each puller wire portion therethrough is straight and subjected to tensile force only. A proximal end of the support member is flattened and serrated to provide a better bonding to the distal end of the deflectable section.

主权项

1. A catheter comprising:
an elongated tubular catheter body with at least one lumen extending there through; a deflectable intermediate section having proximal and distal ends and at least two off- axis lumens extending there through, the proximal end of the deflectable intermediate section being attached to a distal end of the catheter body; and a distal assembly distal of the deflectable intermediate section, the distal assembly comprising:
a tubular structure having a generally straight proximal region attached to the intermediate section, a generally circular main region generally transverse and distal to the proximal region;an elongated support member extending through the generally circular main region of the distal assembly, the elongated support member having shape memory;a non-conductive cover over at least the main region of the distal assembly; andat least one electrode carried on the generally circular main region of the distal assembly; at least one washer at the distal end of the deflectable intermediate section, the washer having at least two off-axis lumens, each axially aligned with a respective off-axis lumen of the deflectable intermediate section; a puller wire having two proximal portions and a mid-portion transverse to the two proximal portions, each proximal portion extending through a respective off-axis lumen of the deflectable intermediate section and a respective off-axis lumen of the washer, the mid-portion being distal of the washer and extending between the two off-axis lumens of the washer; and a control handle comprising a deflection mechanism adapted to act on at least one proximal portion of the puller wire anchored in the control handle to deflect the deflectable intermediate section.