Scaffolds having a radiopaque marker and methods for attaching a marker to a scaffold

A method for making a medical device, comprising:

• using a polymer scaffold including a strut having a hole formed in the strut;
• using a radiopaque rivet marker having a head and a shank;
• and
• placing the rivet into the hole so that the head is disposed on a first surface of the first side of the strut;
• and
• swaging the rivet including making a deformed shank from the shank while the rivet sits in the hole;
• wherein the head resists a first push-out force acting on the first surface by the head interfering with the first side of the hole;
• wherein the deformed shank resists a second push-out force acting on a second surface of the second side of the strut by the deformed shank interfering with the second side of the hole, and
• wherein the marker rivet has an undeformed length (L) before swaging, a deformed length (L′) after swaging, and (L), (L′ ) and the strut thickness (t) are related by
• t×(1.2)≤L≤t×(1.8) and 1.2≤(L/t)≤1.8;
• and
• t×(1.1)≤L′≤t×(1.5) and 1.1≤(L′/t)≤1.5.