An end effector instrument , comprising: an end effector device , the end effector device comprising an effector portion configured to perform a specified operation and an accommodation portion configured to partially accommodate the effector portion, the accommodation portion comprising a first connecting portion, and a delivery device connected to the end effector device , the delivery device being configured to deliver the end effector device to a target region where the specified operation is to be performed, the delivery device includes an operation portion and a delivery pipe, the operation portion being configured to drive the effector portion to perform the specified operation, the operation portion including a shaft, the delivery device includes a second connecting portion, the second connecting portion being positioned at a distal end of the delivery pipe, characterized in that the accommodation portion includes an inner pipe and an outer pipe , at least a portion of the outer pipe fitting snugly over the inner pipe , when an end of the shaft enters into the inner pipe , the second connecting portion is connected to the first connecting portion, and the delivery device is connected to the end effector device , and when the end of the shaft retracts from the inner pipe , the second connecting portion is disconnected from the first connecting portion, and the delivery device is disconnected from the end effector device . an end effector device , the end effector device comprising an effector portion configured to perform a specified operation and an accommodation portion configured to partially accommodate the effector portion, the accommodation portion comprising a first connecting portion, and a delivery device connected to the end effector device , the delivery device being configured to deliver the end effector device to a target region where the specified operation is to be performed, the delivery device includes an operation portion and a delivery pipe, the operation portion being configured to drive the effector portion to perform the specified operation, the operation portion including a shaft, the delivery device includes a second connecting portion, the second connecting portion being positioned at a distal end of the delivery pipe, characterized in that the accommodation portion includes an inner pipe and an outer pipe , at least a portion of the outer pipe fitting snugly over the inner pipe , when an end of the shaft enters into the inner pipe , the second connecting portion is connected to the first connecting portion, and the delivery device is connected to the end effector device , and when the end of the shaft retracts from the inner pipe , the second connecting portion is disconnected from the first connecting portion, and the delivery device is disconnected from the end effector device . the accommodation portion includes an inner pipe and an outer pipe , at least a portion of the outer pipe fitting snugly over the inner pipe , when an end of the shaft enters into the inner pipe , the second connecting portion is connected to the first connecting portion, and the delivery device is connected to the end effector device , and when the end of the shaft retracts from the inner pipe , the second connecting portion is disconnected from the first connecting portion, and the delivery device is disconnected from the end effector device . <EOS>