Abstract: A handheld tool includes a first handle with a first driving portion and the second handle with a second driving portion. The second handle, which is located under the first handle, is connected to f the first handle for turning relative to the first handle between a retracted position and an unretracted position and is positioned at the retracted position and the unretracted position respectively. The second driving portion of the second handle is adjacent to the first driving portion of the first handle when the second handle is turned to the retracted position, and the second driving portion keeps a longest distance from the first driving portion when the second handle is turned to the unretracted position.

Abstract: The present invention describes a contact type electronic stethoscope with a noise interference resisting function for auscultation, and the stethoscope includes a chest piece for contacting a patient's body, a contact type microphone installed in the chest piece for receiving sounds of patient's organs, and an elastic member disposed on an external side of the contact type microphone, so that harsh sounds and irrelevant noises produced by rubbing the surface of clothes with the patient's body can be avoided during an auscultation, if the piece chest is pressed and contacted with the patient's body without reaching a predetermined pressure and maintains a predetermined distance from the patient's body.

Abstract: The present invention describes a method for changing frequency channels of a wireless electronic medical apparatus, which transmits or receives physiological signals produced by human bodies by means of a transmitter and its corresponding receiver of the wireless electronic medical apparatus, and such method includes a step of issuing an instruction to a channel switching module for switching a channel, if there is a conflict of using a frequency channel while several medical apparatuses are using the same frequency channel at the same time.