Choset believes that his snake robot and others like it help reduce medical costs by making complex surgeries (外科手术) faster and easier.Choset says his new design is smaller and more flexible than earlier models.The size of surgical robots allows surgeons to operate with far less damage to the body，helping the patient heal faster.For example，instead of opening the entire chest up during heart surgery，a small hole is made，and a thin robotic snake crawls inside to the proper spot.

　　Dr Ashutosh Tewari of Cornell University Medical Center has used robotic tools to perform thousands of operations.Tewari said he’s most excited about the potential for surgical robots to do things humans can’t do.He said the variety of sensors available for surgical robots keeps expanding，even as they get smaller.He said they may one day be able to test chemicals or blood in the body，or even the electrical connections in nerves.

　　Choset has also built larger snake robots designed for search and rescue，or just exploration.They can climb poles or trees and then look around through a camera in the head，and slid through places humans can’t reach.

　　Another expert at Carnegie Mellon stresses that there’s still an enormous gap between humans and even the most high­tech robots.Manuela Velosa noted that robots have been built that are good at one or two tasks—but not at the variety of tasks humans perform without even thinking.

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