medical devices for assisting with and correcting mobility issues, and parts and fittings therefor; apparatus for use in the mobility fields and parts and fittings therefor; medical devices for assisting with walking and mobility; medical device for assisting with a frozen gait; medical devices for attachment to a cane or walker to assist with walking and mobility; medical devices for attachment to a cane or walker to assist with a frozen gait; and walking aids for medical purposes