Based on the information collected and with reference to some literature, an improved stretcher is now recommended. Improve programs and principles, the existing four fold stretcher structure bed, frame, grip and other parts. Hand can push people, bed can be folded. Improved retractable four fold stretcher wheel end design: the existing four fold stretcher to install two foldable caster, two foldable fixed wheel, and a brake device, wheel diameter 15 cm, thickness 5 cm, wheel seat 5 cm, between the wheel and the stretcher body damping spring.

Improved pull-off four-fold stretcher bed design: universal wheel ends (wounded head position) plus 80 cm pull rope or rod. Fixed wheel end (injured foot position) to install the wounded gun viscose tape. The existing four-fold stretcher waterproof canvas stretcher bed is designed to double, one side of the two layers connected to the other side of the adhesive tape, the outer fixed casualties buckles and vents. Usually the wounded in the outer fixed, rain and snow were fixed in the mezzanine injured. The head on both sides of each 40 cm infusion rod 1, usually received in the stretcher around the rod dedicated groove, with the time spanner to the vertical angle with the stretcher rod and lock. Remove the existing stretcher frame. Principle: Wheeled pulling makes the moving object only need to overcome the rolling friction resistance, which can greatly improve work efficiency and continuous working time, and the bed body design can be conveniently used.