Kenneth G Halvorsen Deceased37133 Desert Sun Dr, Tucson, AZ 85739

RE32204, Jul 15, 1986

Jun 1, 1983

6/499803

Kenneth Halvorsen - San Clemente CA

Mansfield Scientific, Inc. - Mansfield MA

A61B 504

128642

An electrode assembly for use with a catheter, is made of a plurality of insulated wires. The wires are bound together in a bundle by fine insulated wire for almost their entire lengths. At one end of the bundle are free wire ends of different lengths on which are electrically conductive ferrules. The ferrules are spaced apart axially when aligned with the bundle inside the catheter. The wires are made of springy material so that the free wire ends separate widely outside the catheter. Other cylindrical ferrules are mounted in axially spaced position on bared portions of the other end of the bundle, and encircle all the wires, but each ferrule is in direct electrical contact with only one of the wires.

4432369, Feb 21, 1984

Sep 4, 1981

6/299628

Kenneth G. Halvorsen - San Clemente CA

Medi-Tech, Incorporated - Watertown MA

A61B 502

128653

An electromagnetic sensor for measuring signals indicative of a biologic condition in a body channel such as a blood vessel, throat, and the like, comprises a loop-shaped flat frame with laterally compressible and expansible sides, first and second electrodes mounted at opposite sides of the frame, and a third electrode mounted at one side of the frame near the first electrode. Lead wires connected to the electrodes are arranged in a trifilar array and secured to the frame. The lead wires are connected to circuitry comprising a 180. degree. signal inverter for inverting signals picked up at one side of the channel or across the channel to suppress like signals picked up across the channel or at one side of the channel respectively, leaving only desired third signals indicative of the biologic condition to be measured which may be velocity of fluid flow, an esophageal muscular condition, diameter of a blood vessel, etc.