How did Li Chaoyi think of taking out the semi-reverse-threaded screw?

On 20 10, Li Chaoyi became an orthopedic surgeon in Hainan Agricultural Reclamation General Hospital. "Generally, patients with fractures will take steel plates and screws from the hospital one year after the bones heal, but many doctors will encounter slippage when taking screws because the human bones will become longer and tighter during self-repair." Li Chaoyi told reporters that taking the steel plate is a very simple operation, but once the screw slips, the operation time will be extended by one or two hours, which will increase the pain of the patient and even lead to the failure of the operation.

So whenever he has time, Li Chaoyi will look up information on the Internet and think about how to improve the screws. After a year's research, Li Chaoyi developed "anti-thread and anti-skid screw and screwdriver for orthopedics" and obtained the national patent in February of 20 1 1. "But I always feel that there is still a problem." In order to pursue perfection, Li Chaoyi constantly improved the anti-skid screw and invented the "semi-reverse thread take-out screw", which was patented in June this year.

"The nuts of common orthopedic surgery screws are hexagonal or plum-blossom structures. Once the nut is damaged, it may slip when taking the screw. The anti-skid screw I invented is a countersunk hole on the nut, and the countersunk hole adopts a reverse thread structure, so that it will not slip when it is taken out with a screwdriver. " Li Chaoyi told reporters that because there are many foreign patents on the screws used in orthopedic surgery, the price is very high. "Now the patent to solve the screw slippage was obtained by China people. If it is really put into the market in the future, I believe it can greatly reduce costs. "