Biomagnetic Technologies, Inc.

Scott W Riley

Keith Allen Esser

Laurence Warden

D Scott Buchanan

Richard T Johnson

K Randy Brimhall

A thermally conductive feedthrough has a conductive member extending through a fiber-reinforced plastic plate. The feedthrough is sealed against leakage from one side of the plate to the other by placing the plate in local compression to seal it against the plate and/or by using small individual conductive members that minimize the effects of thermal expansion differences. The feedthrough can be used between vacuum and cryogenic liquids.

Solid conductor thermal feedthrough

A biomagnetometer includes a magnetic field sensor including a magnetic field pickup coil and a detector of small electrical currents flowing within the pickup coil. A vacuum-tight enclosure surrounds the sensor. The enclosure has a concavely upwardly curved first wall, with the magnetic field pickup coil located adjacent to the first wall. A vented reservoir of liquefied gas is located within the enclosure, and a solid thermal conductor extends from the sensor. There is a vacuum-tight thermal feedthrough by which the solid thermal conductor passes between the interior and the exterior of the enclosure. Electronic circuitry for filtering and amplifying the signals of the detector is also provided. Such a biomagnetometer is placed below the body of a reclining subject, and a second portion of the biomagnetometer can be placed above the body. In one form, the enclosures are shaped to form a cavity that receives the head of the subject therein, to achieve full head coverage of the pickup coils in the biomagnetometer.

Biomagnetometer with sealed vacuum enclosure and solid conduction cooling

An apparatus for making magnetic measurements of the human body includes a biomagnetometer having a magnetic field sensing coil that measures magnetic fields arising from a selected portion of a body. A position monitor used in conjunction with the biomagnetometer produces no magnetic fields that can interfere with the taking of magnetic field measurements, and can operate simultaneously with the taking of magnetic field measurements. The position monitor includes an optical target mounted on the selected portion of the body, the optical target having a variation in light reflectance across the target. An input optical guide directs a beam of light at the target, an output optical guide collects a reflected beam of light from the target, and a limit detector receives the beam of light from the output optical guide and determines whether the intensity of the received light varies outside of predetermined limits.

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Oceanside, CA, United States of America

Scott W Riley