The intervertebral cage (Cage) has the functions of maintaining the height of the vertebral body, enhancing the local stability, and improving the fusion rate. At the same time, due to its low notch, it can significantly reduce postoperative foreign body sensation in the pharynx and dysphagia. Bone extraction device can achieve minimally invasive bone extraction. The intervertebral cage is composed of a titanium cage made of titanium alloy and a cage made of PEEK. The cages are divided into cervical spine cages and lumbar spine cages.