Final answer:
Sequential compression devices are used after surgery to promote circulation and prevent blood clots.
Step-by-step explanation:
The purpose of using sequential compression devices after surgery is to promote circulation and prevent blood clots. These devices are used to apply pressure to the legs, helping to improve blood flow and prevent the formation of blood clots, which can be a serious complication after surgery. By stimulating circulation, the devices also aid in the removal of waste products and deliver oxygen and nutrients to the tissues.