Abstract: An electrocardiographic electrode is disclosed, which comprises an electrode element consisting of a synthetic resin electrode element having a head portion with a lead attached thereto and having a straight recessed portion, a neck portion having an engagement portion narrower than the head portion and capable of being engaged in an expansible member and a straight portion continuous to the straight recessed portion of the head portion and a bottom portion formed under, broader than and supporting the neck portion and to be held in contact with the skin of a living body, the outer surface of the synthetic resin electrode element member being imparted with electric conductivity by coated metal powder, an expansible member engagedly locked in the engagement portion of the neck portion, and an adhesive film consisting of an adhesive, having a central portion and secured to the expansible member to be held in close contact with the skin of the living body.

Abstract: An electrocardiographic current derivation electrode is disclosed, which consists of a substantially rectangular lamination consisting of a resin film, a deposited silver layer formed on one surface of the resin film, a conductive adhesive layer coated on the deposited silver layer and a foamed sheet applied to the outer surface of the resin film. The electrocardiographic current derivation electrode is formed in a substantially central portion thereof with a substantially parallelogrammic terminal. One short side of the terminal is foldably united to the rest of the electrocardiographic current derivation electrode, the other three sides of the terminal are cut sides, and the long cut sides of the parallelogram are not parallel to the long sides of the substantially rectangular electrocardiographic current derivation electrode.

Abstract: A method of diagnosing the heart condition of a living body moving in the water, in which an electrocardiogram recorded by the steps of hermetically contacting electrodes on the skin surface of the body moving under water, detecting an electrocardiac signal by the electrodes, leading the detected electrocardiac signal through lead wires to a wireless transmitter on the living body, remotely receiving the radio electrocardiac signal transmitted from the transmitted by a receiver, and recording the electrocardiogram on the basis of the radio electrocardiac signal received by the receiver.

Abstract: A waterproof electrode assembly with a transmitter for recording an electrocardiogram, in which the electrodes can reliably be attached on the outer surface of a human body due to bonding force of the adherent sheet and the sucking force caused by returning action of a cup-shaped suction disk to its original shape, the electrodes are not separated from the body even during severe exercise in the water, such as swimming. The waterproofness of the electrode assembly is reliable and durable, and the electrocardiogram of the living body during swimming can be efficiently and accurately recorded, no current leakage phenomenon occurs, the entanglement of the cable with legs and arms can be removed.

Abstract: An electrocardiographic amorphous alloy electrode is manufactured from an iron-based (or nickel-based) amorphous alloy containing chromium as a metallic element and also containing at least one member of a group consisting of phosphorus, carbon, silicon and boron as a non-metallic element or semi-metallic elements.