A lot of the devices used in rehabilitation are utilized as a therapeutic adjunct, usually used during their therapy sessions and by the therapists. At least, from what I have heard, residents typically aren't using many of these types of things.
That being said, prosthetic care is very med-device / engineering heavy, as prostheses and orthoses are all bioengineering feats. Pain medicine has a slightly different pull, but neuromodulation is med-device-y (think spinal cord stimulation, dorsal root ganglion stimulation, peripheral nerve stimulation, and all of the minimally invasive surgical devices that pain physicians implant).