Variable diameter stents

A device for insertion into a blood vessel lumen to provide a generally radially outward force on the blood vessel lumen, comprising:

• a first end section comprising a first plurality of struts having a first diameter and defining a proximal face, wherein a length of the first plurality of struts progressively increases towards the proximal face, and wherein a first crown angle between adjacent struts of the first plurality of struts progressively increases towards the proximal face;
• a second end section comprising a second plurality of struts having a second diameter and defining a distal face, wherein a length of the second plurality of struts progressively increases towards the distal face, and wherein a second crown angle between adjacent struts of the second plurality of struts progressively increases towards the distal face;
• a body section extending between the first end section and the second end section and comprising a third plurality of struts;
• and
• a device lumen extending through the first end section, the body section, and the second end section, the device lumen being configured to allow blood flow through the device, wherein, in an expanded configuration:
• the first diameter of the first end section increases from the body section towards the proximal face, and the second diameter of the second end section increases from the body section towards the distal face, and
• a radial force of the device is substantially constant from the first end section to the body section to the second end section when each section is at substantially a same diameter.