Passive biotelemetry
US6692446B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Sep 1, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/17
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and a device for measuring a physiological variable in a living body, whereby a transmitter (1) is disposed outside of the body to transmit radio frequent energy, and a receiver (3) of radio frequent energy is disposed outside of the body. A transponder unit (2), having a sensor (11) sensitive to the physical variable, and a modulator unit (12) for controlling the radio frequent energy absorption of the transponder unit according to a time-sequence representing said physical variable, is introduced into the body. The transmitter sends radio frequent energy of substantially constant frequency and amplitude onto the transponder, and the receiver monitors the radio energy absorption of the transponder unit to determine the time-sequence representing said physical variable. The time-sequence is decoded to interpret it as a measure of the physical variable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.