Patent ID: 7599747

Claim:
A screw-in electrode probe for cardiological application comprising: a. an elongated electrode body made of an electrically insulating material, the electrode body having a distal end; b. an electrical supply line rotatably extending within the electrode body; and c. an electrode head on the distal end of the electrode body, the electrode head including: (1) a housing, (2) an electrically conductive shaft affixed to the supply line, the shaft being rotatably and axially displaceably mounted within the housing; (3) a screw-in electrode on the shaft, and (4) a contact spring extending between and electrically connecting the housing and the shaft, the contact spring being an essentially planar spiral spring wound around the shaft and exerting radially-oriented spring force, and having at least one of its outer and inner diameters in sliding contact with at least one of the housing and the shaft.