Since ancient times, natural disasters, accidents and public safety incidents have been happening all over the world. Rescue and rescue have always been a concern of people in various disaster disasters. Stretcher is an important medical tool to transport wounded people during the rescue. Usually, at the scene of a disaster and disaster, the road is uneven, and the ambulance stretcher's stability is hard to be guaranteed when ambulances carry the stretcher. In addition, most people live in high-rise buildings in cities. In the event of a serious illness that can not be moved autonomously, such as a stroke, ambulancemen also need to use stretchers to provide assistance. For buildings without elevators, patients are easily inclined by stairs Even overturn.

In the early stages of ambulance treatment, over-tilting during handling will not only increase the suffering of the sick and wounded, but also worsen the condition of the sick and wounded, easily causing secondary injuries to the sick and wounded, greatly reducing the efficiency of the rescue. In particular, Fractures, internal injuries and internal bleeding in the wounded and sick, and even endanger their lives and safety. Therefore, it is important to keep critically ill patients in the correct posture when rescuing them. For fractured patients, should maintain a relaxed position to reduce the pressure on the bones. For patients with sudden heartbeat and respiratory arrest, they should lie on hardwood board beds to avoid distorting the torso of the head and neck. In addition, the tilt of the stretcher during intravenous injection may lead to air leakage into the IV tube, posing a life-threatening risk to the wounded and sick. How to make the stretcher to avoid tilting to maintain a smooth, reduce secondary injuries, a rescue work a major problem. The common hand-held stretcher which is widely used nowadays is difficult to meet the rescue work in special occasions. Therefore, it is very important to study the self-balancing stretcher which is easy to carry and carry to improve the rescue efficiency.