A circular stapler with an automatic safety mechanism

A circular stapler with an automatic safety mechanism, comprising a stapler body, a stapler head, an actuating mechanism and a transmission adjusting mechanism;

• wherein the actuating mechanism comprises a handle (1) and a handle coat (2), the handle (1) is connected with the handle coat (2) and is pivotally connected with the stapler body, the transmission adjusting mechanism comprises a screw rod (4) and an adjusting knob (6), the front end of the screw rod (4) is connected with an anvil pulling rod while its rear end is connected with the adjusting knob (6) by means of screw threads, characterized in that:
• a stopper (8) is disposed either inside said handle (1) or said handle coat (2);
• a safety rod (3) and a pulling sheet (5) are further provided, the safety rod (3) has a safety block (13) on one end and has a protruding block (14) and a pin hole as its middle portion;
• a cylindrical pin is inserted into the pin hole so as to get the safety rod (3) to be pivotally connected with the stapler body;
• the pulling sheet (5) has a rear portion (9) mounted on the screw rod (4) and has a pulling hook (10) at its front portion, the pulling hook (10) hooks with a protruding block (14) which is the middle portion of the safety rod (3);
• a restoring spring is provided so as to connect the safety rod (3) with the stapler body, the safety rod (3) is driven by the biased spring to get reset by rotating anticlockwise around the cylindrical pin which connects the spring with the stapler body, until said safety block (13) props against the stopper (8) which is either disposed inside the handle (1) or the handle coat (2).