Multi-function Anesthesia Solutions (Cone Masks),

　　 The system aims to provide one complete solution to both initial and lasting anesthesia of small rodents for the majority of procedures such as development of animal disease models(cerebral ischemia, myocardial ischemia and osteoporosis disease models), tail-vein injection, blood sampling from abdominal aorta and heart, drug injection to ventricle, remove of tissue/organ, anatomy of body and so on. The cone mask with minimal dead space can be randomly positioned by