A method and a system for data transmission between a first electronic device and a second electronic device, wherein the second electronic device is in a sleep mode. A noise reduction filter is applied on the scatter plot to define a mask shape which can be extracted and filled-in to generate a mask. The drooping piece formed by bending an end of the leaf spring of an automatic stop mechanism disposed on a top face of the upper blade is engaged and accommodated within the groove portion and a projecting portion projecting forward is provided at a bottom end of the groove portion. The illumination type push button switch thus lighting the push buttons clearly includes a small number of components and is inexpensive. A relay unit changes the destination to the target connection request destination based on the connection request information and sends the connection request information to the target connection request destination to thereby make a connection request, and also sends connection result information obtained from the target connection request destination to the communication source client. The gas is directed across an opening 48 in the instrument delivery member 2 to help retain the gas in the patient’s thoracic cavity.