Anti-inversion bumper for expandable ablation catheter assembly

A The medical device, the medical device comprising:

• an outer member having a proximal end and an opposite distal end;
• an inner member movable within the outer member;
• an expandable assembly extending distally from the distal end of the outer member, the expandable assembly including a distally located central hub portion affixed to the inner member and a plurality of splines, each of the plurality of splines including a distal end portion extending from the central hub portion, and a proximal end portion attached to the distal end of the outer member;
• and
• a cylindrical or conical bumper positioned on the inner member within the expandable assembly, the bumper configured to abut an inner surface of the distal end portion of the plurality of splines to prevent inversion of the plurality of splines.

A medical device, the medical device comprising:

• an outer member having a proximal end and an opposite distal end;
• an inner member movable within the outer member;
• an expandable assembly extending distally from the distal end of the outer member, the expandable assembly including a distally located central hub portion affixed to the inner member and a plurality of splines, each of the plurality of splines including a distal end portion extending from the central hub portion, and a proximal end portion attached to the distal end of the outer member;
• and
• a bumper positioned on the inner member within the expandable assembly, the bumper configured to abut an inner surface of the distal end portion of the plurality of splines to prevent inversion of the plurality of splines, the bumper including a first portion having a first diameter, and a second portion having a second diameter that is larger than the first diameter.