Radial expansion and contraction features of medical devices

A medical assembly comprising:

• an implant delivery device comprising
• a handle comprising a controller including a user input,
• a catheter extending from the handle, the catheter having a distal end section configured to be inserted into a vessel of a patient, the distal end section comprising a plurality of motors and a plurality of radially adjustable structures, and
• one or more electrical conductors extending through the catheter, wherein the one or more electrical conductors electrically connect the motors to the controller;
• wherein the controller is configured to generate control signals that actuate the motors based on input received by the user input;
• and
• an implantable medical device coupled to the distal end section of the catheter;
• wherein the controller is configured to actuate the motors, which cause the radially adjustable structures to expand and cause the implantable medical device to radially expand from a radially compressed state to a radially expanded state inside the patient;
• wherein the plurality of radially adjustable structures comprises a first radially adjustable structure and a second radially adjustable structure, wherein the first radially adjustable structure is radially expandable from a first diameter to a second diameter, wherein the second radially adjustable structure is radially expandable from a third diameter to a fourth diameter, wherein the first and third diameters are the same, and wherein the second and fourth diameters are different;
• and
• wherein the motors are independently controllable with respect to each other by the controller such that the plurality of motors can radially expand the first and second radially adjustable structures different amounts to the second and fourth diameters, respectively, such that the implantable medical device expands from the radially compressed state to the radially expanded state in which the implantable medical device varies in diameter along its length.