All I really fear is falling down the stairs and pulling a Christopher Reeve. How about a strap which hooks on to a special belt you wear whenever you ascend or descend stairs. The strap, or tether, is connected to a mechanism which travels up and down the stairs with you on a track imbedded in the wall of the stairway. If you start to fall the acceleration is sensed and a brake is quickly,but not totally abruptly, applied to prevent you from going too far. Would anybody else clip this on whenever you were about to use the stairs? We could sell it on the List here on-line and I could get rich from the royalties (although getting rich does not seem to have the allure it once did!).