Title:
COMMUNICATING WITH AN IMPLANTED WIRELESS SENSOR
Document Type and Number:
WIPO Patent Application WO2006049796
Kind Code:
A3
Abstract:
The present invention determines the resonant frequency of a sensor (120) by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor (120). The system energizes the sensor (120) with a low duty cycle, gated burst of RF energy having a predetermined frequency or set of frequencies and a predetermined amplitude. The energizing signal is coupled to the sensor (120) via magnetic coupling and induces a current in the sensor (120), which oscillates at the resonant frequency of the sensor (120). The system receives the ring down response of the sensor (120) via magnetic coupling and determines the resonant frequency of the sensor (120), which is used to calculate the measured physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal.
Inventors:
JOY JAMES (US)
KROH JASON (US)
ELLIS MICHAEL (US)
ALLEN MARK (US)
PYLE WILTON (US)
KROH JASON (US)
ELLIS MICHAEL (US)
ALLEN MARK (US)
PYLE WILTON (US)
Application Number:
PCT/US2005/035936
Publication Date:
October 05, 2006
Filing Date:
October 04, 2005
Export Citation:
Assignee:
CARDIOMEMS INC (US)
JOY JAMES (US)
KROH JASON (US)
ELLIS MICHAEL (US)
ALLEN MARK (US)
PYLE WILTON (US)
JOY JAMES (US)
KROH JASON (US)
ELLIS MICHAEL (US)
ALLEN MARK (US)
PYLE WILTON (US)
International Classes:
G01D1/14; G01R23/00; G01R23/08; G01R23/12; G01R23/175; G01R25/00; H01Q7/00; H03L7/00; H04B15/00
Foreign References:
| US6111520A | 2000-08-29 | |||
| US20030139677A1 | 2003-07-24 | |||
| US4152669A | 1979-05-01 | |||
| US6743183B1 | 2004-06-01 | |||
| US6259328B1 | 2001-07-10 | |||
| US5896113A | 1999-04-20 | |||
| US6237398B1 | 2001-05-29 |
Other References:
See also references of EP 1817593A4
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