Electrode sets with resiliently mounted pin electrodes

Claim 1

An electrode for an electrocardiograph used for measuring potentials of a number of points of a body surface near the heart and producing an isopotential map thereof, said electrode comprising: a plurality of pin contact sets each being conductive at least on its surface and each having a plurality of movably mounted parallel pin contacts for movement reciprocally in the direction of their lengths for directly contacting the human body surface; and resilient members, one connected to each pin contact for resiliently urging the end of each pin contact in the direction of its length toward the human body surface; the pin contacts of each set being mounted in a small area close to one another on said electrode and being mutually electrically connected in parallel, the space between the pin contacts of each pin contact set being much smaller than the space between the adjacent small areas of the pin contact sets, whereby the potential at a position on the body surface contacted by a pin contact set can be detected as long as one pin electrode in the set is in good contact with the body, even if the other pin contacts in the set are in bad contact.