Abstract: A medical electrode apparatus and a kit of components therefor, for use on the skin of a patient in conjunction with an external medical instrument such as an EKG machine. The apparatus includes a resilient bulb member for creating a partial vacuum in a vacuum bell to which it is selectively connected. The vacuum bell is formed with a lower outer concavity surrounding an inner chamber thereof so as to receive therein an electrically-conductive gel material for contact with the patient's skin. Alternatively, the bell may be formed with an annular rim member formed of a closed-cell electrically-conductive sponge material. The vacuum bell is also provided with a connector member for securing therein an electrode terminal of an external medical instrument.