This Vibrating Bed Is Designed to Remove Kidney Stones

The wife of Zhu Qinghua, a rice farmer in Jiangxi, China, has kidney stones. She has already lost one kidney, so it is imperative to keep the other one healthy.
Her doctor said that she should stand on her head periodically in order to dislodge the stones. To make that easier, Zhu designed and built this bed, which holds a patient at different angles. It has a driving wheel from a tractor which vibrates the bed as his wife lies in it. This is supposed to shake the kidney stones loose.
Zhu has patented his invention and hopes to soon begin mass producing it.