Nonmagnetic body movement detector and biomagnetometer utilizing the detector
US5265609A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1991 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Aug 28, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/08
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.