Closing driving mechanism and medical stapler comprising same

The present disclosure provides a closing driving mechanism and a medical stapler comprising same. The closing driving mechanism comprises a driving portion and a cylinder body. The driving portion is connected to a closing pull piece of the stapler, a cavity portion is formed in the cylinder body, and a one-way valve is provided on one side of the cavity portion. When the driving portion moves towards a distant end side of the stapler, the volume of the cavity portion is reduced, the one-way valve is closed to form an unidirectional air damping structure, and the driving portion drives the closing pull piece to move towards the distant end side of the stapler, so as to drive the head of the stapler to be opened; moreover, because the driving portion is subject to the resistance of the compressed air in the cavity portion, the movement speed of the driving portion is decreased, a staple cartridge and a staple anvil of the stapler are slowly separated, and the situation that surrounding tissue is damaged due to the fact that the force for opening a jaw is too large is avoided.