Disclosed is an assembly and method for implant installation between adjacent vertebral bodies of a patient. More specifically, a signal receiving device uses a visual recording device to locate the signal display screen of a signal transmitting device by employing an alternating image detection method. A filling material may be filled in the compartment for absorbing vibrations generated as a result of striking a golf ball. Thereafter a fresh lancet can be inserted into the cavity of the lancet activating device from the lancet insertion aperture. The input-shaft mechanism has an input shaft inserted in the housing from its outside and an input bevel gear of a small diameter mounted on the input shaft and engaging with the driving bevel gear and is disposed between two adjacent transmission mechanisms.