Patent ID: 7900806

Claim:
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 second 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 the second 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 restoring 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 ); and wherein the front portion of said pulling sheet ( 5 ) is divided into at least three plates, and the pulling hook ( 10 ) is the front portion of the middle plate; a protruding block ( 7 ) is disposed on the handle ( 1 ), when the handle ( 1 ) is gripped, the protruding block ( 7 ) props against and pushes away said middle plate, thereby the pulling hook ( 10 ) is disengaged from said protruding block ( 14 ) which is the middle portion of the safety rod ( 3 ).