Abstract: A contactor for diagnostic or therapeutic purposes has a nonmetallic suction cup surrounding a recessed electrode which comprises a contact plate of compressed or sintered silver powder admixed with a silver salt, e.g. silver chloride, supported on a conductive body of graphite. A metallic tube traversed by an airstream, communicating through a lateral orifice with the interior of the suction cup, passes through a bore of the graphite body to form part of a conductive connection between the electrode and a remote voltage source. The tube is silver-coated in its area of contact with the graphite body, as is a grub screw holding that tube in position within that body.

Abstract: A gas compressor and the electrical circuitry for an EKG or the like are carried in a support having a post whose upward end carries one end of a parallelogrammatic linkage the other end of which is a head from which hang a plurality of suction-type electrodes. One long link of the parallelogrammatic linkage is formed by a pair of metal tubes, one of which conducts compressed air to the electrode-carrying head, so that this compressed air can operate jet pumps in the electrodes to hold same on the patient, and the other tube contains a multiconductor wire connected to the various electrodes. Thus the gas feed is conveniently housed in the supporting linkage and the electrical conductors are all well shielded within the metal tubing.