A system (10) for delivering an implantable medical device (50) to a treatment site within a patient includes an implantable medical device including a rigid body (52), and a delivery device (12). The delivery device includes an elongated catheter shaft (14) and an expandable balloon (20) connected to the elongated catheter shaft adjacent a distal end (18) of the elongated catheter shaft, where the expandable balloon includes a proximal region (28), a distal region (30), and an implant retaining portion (32) disposed between the proximal region and the distal region. The delivery device also includes a compression element (40) connected to the implant retaining portion of the expandable balloon, where the compression element is adapted to limit expansion of the implant retaining portion of the expandable balloon when the expandable balloon is at least partially inflated. At least a portion of the compression element and the implant retaining portion are disposed within a lumen (58) of the implantable medical device.