Double loop lasso with single puller wire for bi-directional actuation
A catheter has a distal assembly with at least one loop with ring electrodes. 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.
1. A catheter comprising:
a catheter body including a first catheter-body lumen and a second catheter-body lumen;
a distal assembly comprising a support member;
a connector section disposed over a distal end of the catheter body and a proximal portion of the support member;
a washer disposed in the connector section between the distal end of the catheter body and the proximal end of the support member, the washer including a first washer lumen and a second washer lumen; and
a single puller wire including a first proximal portion extending through the first catheter-body lumen and the first washer lumen, a second proximal portion extending through the second catheter body lumen and the second washer lumen, and a mid-portion disposed in the connector section distal to the washer and proximal to the proximal portion of the support member.
2. The catheter of claim 1 , in which the proximal portion of the support member is anchored in the connector section by an adhesive.
3. The catheter of claim 2 , in which the proximal portion of the support member comprises serrations.
4. The catheter of claim 2 , in which the proximal portion of the support member comprises raised regions and recessed regions.
5. The catheter of claim 2 , in which the proximal portion of the support member comprises a toothed surface.
6. The catheter of claim 2 , in which the distal assembly comprises a circular region.
7. The catheter of claim 6 , in which the circular region comprises at least a first loop.
8. The catheter of claim 7 , in which the circular region further comprises a second loop.
9. The catheter of claim 6 , in which the circular region comprises a spiral form.
10. The catheter of claim 6 , in which the distal assembly further comprises a plurality of electrodes.
11. The catheter of claim 6 , in which the support member comprises a shape memory material.
12. The catheter of claim 6 , in which the support member further comprises a straight portion disposed between the circular region and the proximal portion of the support member.
13. The catheter of claim 12 , in which the straight portion is disposed transverse to the proximal portion of the support member.
14. The catheter of claim 13 , in which the circular region is disposed transverse to the proximal portion of the support member.
15. The catheter of claim 14 , in which the proximal portion of the support member extends axially out of the connector section.