COMMUNICATION SYSTEM WITH ANTENNA BOX AMPLIFIER

• US 20090237213A1
• Filed: 02/26/2009
• Published: 09/24/2009
• Est. Priority Date: 02/29/2008
• Status: Active Grant

• Current Assignee: St. Jude Medical Luxembourg Holdings Ii S.A.R.L.
• Original Assignee: CardioMEMS Incorporated
• Inventors: Ellis, Michael G.
• Granted Patent: US 8,159,348 B2
• Time in Patent Office: Days
• US Class Current: 340/10.100
• CPC Class Codes: A61B 2560/0219 of externally powered implanted units
• CPC Class Codes: A61B 5/0031 Implanted circuitry

Abstract

A communication system for communicating with an implanted wireless sensor is provided. A transmit antenna element can propagate an energizing signal onto a communication medium and a receive antenna element can recover a responsive implanted sensor response signal. The antenna box includes a power amplifier for amplifying the energizing signal and timing regeneration circuitry for detecting an end to signals and outputting control signals for selecting mode operation. The antenna box can receive the energizing signal from the antenna cable in a transmit mode and provide the implanted sensor response signal to the antenna cable in a receive mode. The antenna box can communicate with an electronic box and/or conversion box that provide and receive signals and provide power via the antenna cable.

Claims

1. A system comprising:

a transmit antenna element for propagating an energizing signal onto a communication medium;

a receive antenna element for recovering an implanted sensor response signal from the communication medium, the implanted sensor response signal being responsive to the energizing signal; and

an antenna box in electrical communication with the transmit antenna element and with the receive antenna element, the antenna box comprising;

a power amplifier for amplifying the energizing signal received from an antenna cable to a second power level from a first power level and for providing the energizing signal at the second power level to the transmit antenna element; and

timing regeneration circuitry for outputting control signals to change the antenna box to a receive mode upon detecting an end to the energizing signal and to change the antenna box to a transmit mode upon identifying an end to the implanted sensor response signal by identifying an end to a response time window of a pre-set amount of time,

wherein the antenna box is capable of receiving the energizing signal from the antenna cable in the transmit mode and providing the implanted sensor response signal to the antenna cable in the receive mode.

2. The system of claim 1, wherein the antenna cable is one of:

a single coaxial cable;

or

a bundled cable.

3. The system of claim 1, wherein the antenna box is capable of receiving the energizing signal and a power signal through the antenna cable from a conversion box in electrical communication with an electronic box capable of supplying the energizing signal and the power signal to the conversion box, the power signal being a direct current (DC) power signal.

4. The system of claim 3, wherein the antenna box further comprises a voltage regulator for regulating the DC power signal to supply a first DC power signal at a first voltage level and a second DC power signal at a second voltage level.

5. The system of claim 1, wherein the antenna box further comprises a receive switch controllable by the control signals outputted by the timing regeneration circuitry to change the antenna box to the receive mode or to the transmit mode.

6. The system of claim 1, wherein the power amplifier is an RF amplifier capable of providing a disconnect within a pre-set amount of time after the end of the energizing signal, the RF amplifier comprising at least one of:

a full H-Bridge amplifier;

or

a modified H-Bridge amplifier.

7. The system of claim 6, wherein the pre-set amount of time after the end of the energizing signal is 100 nanoseconds.

8. The system of claim 1, wherein the antenna box further comprises a receive amplifier and buffer capable of amplifying the implanted sensor response signal to a response signal and capable of providing the response signal to an electronic box through the antenna cable.

9. A communication system comprising:

an electronic box for generating an energizing signal at a first power level;

a conversion box in electrical communication with the electronic box, the conversion box being capable of attenuating the energizing signal to a second power level and providing the energizing signal at the second power level to an antenna box through an antenna cable; and

the antenna box comprising;

a power amplifier for amplifying the energizing signal received from the conversion box through the antenna cable to a third power level from the second power level and for providing the energizing signal at the third power level to a transmit antenna element for transmitting the energizing signal at the third power level onto a communication medium; and

timing regeneration circuitry for outputting control signals to change the antenna box to a receive mode upon detecting an end to the energizing signal and to change the antenna box to a transmit mode upon identifying an end to an implanted sensor response signal by identifying an end to a response time window of a pre-set amount of time, the implanted sensor response signal being responsive to the energizing signal and recovered from the communication medium by a receive antenna element,

wherein the antenna box is capable of receiving the energizing signal from the conversion box through the antenna cable in the transmit mode and providing the implanted sensor response signal to the conversion box through the antenna cable in the receive mode.

10. The communication system of claim 9, wherein the conversion box comprises a diplex filter for combining the energizing signal with a direct current (DC) power signal received from the electronic box, the combined energizing signal and DC power signal being provided to the antenna box through the antenna cable.

11. The communication system of claim 9, wherein the electronic box comprises the conversion box.

12. The communication system of claim 9, wherein the electronic box comprises a field-programmable gate array (FPGA) for generating the energizing signal at a pre-selected frequency and for providing a control signal to a switch to toggle between a signal transmission mode and signal reception mode.

13. The communication system of claim 9, wherein the antenna cable is one of:

a single coaxial cable;

or

a bundled cable.

14. The communication system of claim 9, wherein the power amplifier is an RF amplifier capable of providing a disconnect within a pre-set amount of time after the end of the energizing signal, the RF amplifier comprising at least one of:

a full H-Bridge amplifier;

or

a modified H-Bridge amplifier.

15. The communication system of claim 14, wherein the pre-set amount of time after the end of the energizing signal is 100 nanoseconds.

16. The communication system of claim 9, wherein the antenna box further comprises a receive amplifier and buffer capable of amplifying the implanted sensor response signal to a response signal and capable of providing the response signal to the electronic box through the conversion box and the antenna cable, wherein the electronic box is capable of processing the response signal.

17. A method comprising:

operating in a transmit mode by;

receiving an energizing signal at a first power level from an antenna cable;

amplifying the energizing signal to a second power level from the first power level;

providing the energizing signal at the second power level to a transmit antenna element for propagating the energizing signal at the second power level onto a communication medium; and

detecting an end to the energizing signal;

changing to a receive mode from the transmit mode after detecting the end to the energizing signal;

operating in the receive mode by;

receiving an implanted sensor response signal recovered from the communication medium by a receive antenna element, the implanted sensor response signal being responsive to the energizing signal;

providing the implanted sensor response signal to the electronic box through the antenna cable; and

identifying an end to the implanted sensor response signal by identifying an end to a response time window of a pre-set amount of time; and

changing to the transmit mode from the receive mode after identifying the end to the implanted sensor response signal.

18. The method of claim 17, further comprising:

generating the energizing signal at a third power level;

attenuating the energizing signal from the third power level to the first power level; and

providing the energizing signal at the first power level to the antenna cable.

19. The method of claim 18, further comprising:

amplifying the implanted sensor response signal to a fourth power level;

providing the implanted sensor response signal at the fourth power level to the antenna cable; and

processing the implanted sensor response signal at the fourth power level.

20. The method of claim 17, wherein operating in the transmit mode further comprises:

providing a disconnect in the transmit antenna element within a pre-set amount of time after the end of the energizing signal.