Efficacy of mother-child-grandchild technique: 4Â F and 5Â F inner catheters through mother guide catheter

Stent delivery failure to the distal lesion was still encountered even after the introduction of mother-child technique using a 5 F or 4 F child catheter. A 5 F inner catheter with a length of 112 cm, and a 4 F inner catheter with a length of 122 cm enabled a novel mother-child-grandchild technique. In in vitro experiments, not only was backup support increased, but superior trackability could also be obtained with the mother-child-grandchild technique, over the mother-child technique. We describe the clinical data using this novel mother-child-grandchild technique to deliver a stent to the severely bended and/or calcified distal lesion.