Apparatus for sensing human prostate tumor
US7283868B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2001 |
| Grant date | Oct 16, 2007 |
| Priority date | — |
| Expiry date | Dec 15, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/4381
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An electromagnetic bioimpedance measurement apparatus uses an alternating magnetic field to induce electrical eddy currents in biological tissue. The eddy currents produce secondary magnetic fields that have the effect of changing the mutual inductance between the tissue and the coil that applied to the initial magnetic field. The amplitude of the resultant voltage, as measured by the same coil or a different receiver coil, is proportional to the conductivity of the tissue. A simple, marginally stable oscillator circuit is used to generate the current into the coil. Nearfield holographic signal processing is then used for holographic image formation. Bioimpedance is used to distinguish between normal tissue and cancerous tissue, especially cancerous prostate tissue. An invasive embodiment includes driven needle electrodes that are inserted into the body segment to be tested. Noninvasive embodiments include single or multiple coils arranged on a probe shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.