Most patio doors have tracks that have raised metal at different heights. This is a major obstacle for power wheelchairs as it is very difficult to cross over the track. Ideally the device could cover the track and create stability for the wheelchair user. It needs to be removable, in order to close the door and ideally can be used by someone with only one hand. He would need to be able to place it of the track and remo e it independently. I have the metal risers but alone this doesn't work and could be repurposed into this project development, if needed.