The electric physiology signal is measured, the sensor assembly which has the electric conduction bridge is offered. With one execution example, as for the electric conduction bridge, the expansion possible component where you can install the absorption material in one end is included. Opening passing by the component which is, expansion possible extending, it forms the empty concave section. Compilation of electric conduction route between the skin of the electrode and the patient becomes possible by adding conductive medium to the empty concave section, depending upon the electric conduction bridge.電気生理学的信号を測定し、導電ブリッジを備えるセンサ・アセンブリを提供する。一実施例では、導電ブリッジは、一端に吸収材料が取り付けられた膨張可能な部材を含む。開口が膨張可能な部材を通って延びて空凹部を形成する。導電性媒体を空凹部に加えることによって、導電ブリッジにより電極と患者の皮膚の間の導電経路の作成が可能になる。