A cover (150) for a vibratory pad (10) comprises a pocket or pouch (158) faced with dressing fabric material and sized to accommodate a vibration pad, a closure (154e) to retain the cover on the pad, in use, and a strap (146,148) integral with the cover suitable for connecting the cover (and a pad retained therein) to the limb (29) of a patient. The strap has an (adhesive) connector (176) that is capable of being secured so as to pressure the pad against the limb and so that, once made, the connection cannot be unmade without disabling the connector against making subsequent connections. Thus the cover can only be used once. A system (12′150′) includes the vibration device and comprises means to disable the device after a cover has been employed for a period of time or number of treatments.
