Stent alignment during treatment of a bifurcation

A system for treating a bifurcation, the system comprising:

• a first radially expandable stent comprising a proximal end, a distal end, a sidewall having a side hole therethrough, and a plurality of lateral elements extending laterally away from the side hole,
• wherein the first radially expandable stent has a collapsed configuration and an expanded configuration, in the collapsed configuration the first radially expandable stent configured for delivery to the bifurcation, and in the expanded configuration the first radially expandable stent configured to support a vessel wall adjacent the bifurcation;
• a second radially expandable stent comprising a proximal end, a distal end, and a plurality of axial elements extending axially away from the proximal end of the second radially expandable stent, and
• wherein the second radially expandable stent has a collapsed configuration and an expanded configuration, in the collapsed configuration the second radially expandable stent configured for delivery to the bifurcation, and in the expanded configuration the second radially expandable stent configured to support a vessel wall adjacent the bifurcation, and
• wherein the plurality of axial elements of the second radially expandable stent are interdigitated with the plurality of lateral elements of the first radially expandable stent when the first radially expandable stent and the second radially expandable stent are in the expanded configuration;
• a first delivery catheter comprising a first elongate shaft with a proximal end and a distal end, and a first expandable member adjacent the distal end of the first elongate shaft, wherein the first radially expandable stent is disposed on the first expandable member;
• and
• a second delivery catheter comprising a second elongate shaft with a proximal end and a distal end, and a second expandable member adjacent the distal end of the second elongate shaft,
• wherein the second radially expandable stent disposed on the second expandable member, and
• wherein the first delivery catheter is coupled to the second delivery catheter, so that the first and second delivery catheters are alongside each other during advancement to the bifurcation,
• wherein the coupling comprises the second elongate shaft disposed under a proximal portion of the first radially expandable stent without the second expandable member being disposed under the proximal portion of the first radially expandable stent, and
• wherein the second expandable member is distal of the first expandable member without overlap therebetween.