Array system and method for locating an in vivo signal source

• US 20020173718A1
• Filed: 05/20/2002
• Published: 11/21/2002
• Est. Priority Date: 05/20/2001
• Status: Active Grant

• Current Assignee: Arkady Glukhovsky, Daphna Levy, Mordechai Frisch
• Original Assignee: Arkady Glukhovsky, Daphna Levy, Mordechai Frisch
• Inventors: Glukhovsky, Arkady, Frisch, Mordechai, Levy, Daphna
• Granted Patent: US 6,904,308 B2
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 1/00016 using wireless means
• CPC Class Codes: A61B 1/041 Capsule endoscopes for imaging
• CPC Class Codes: A61B 5/0008 Temperature signals
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/061 Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body A61B1/00158 takes precedence
• CPC Class Codes: A61B 5/064 using markers A61B5/062 takes precedence
• CPC Class Codes: A61B 5/065 Determining position of the probe employing exclusively positioning means located on or in the probe, e.g. using position sensors arranged on the probe
• CPC Class Codes: A61B 5/073 Intestinal transmitters

Abstract

A system and method for localizing an in vivo signal source using a wearable antenna array having at least two antenna elements. The signal is received and a signal strength is measured at two or more antenna elements. An estimated coordinate set is derived from the signal strength measurements.

Claims

1. A system for localizing an in vivo signal source comprising:

an antenna array adapted to attach to a body, said array comprising a plurality of antenna elements;

a signal strength detector connected to said antenna array and adapted to measure signal strength of signals received from the signal source at two or more of said antenna elements; and

a processing unit adapted to communicate with said signal strength detector and to correlate the signal strength measurements at two or more of said antenna elements to an approximate coordinate set for the in vivo signal source.

2. The system according to claim 1, further comprising an antenna selector.

3. The system according to claim 2, wherein each of a subset of said plurality of antenna elements is located near a point having a known coordinate set within a coordinate system centered in proximity of the body.

4. The system according to claim 3, wherein said processing unit is adapted to calculate a distance value associated with each signal strength measurement.

5. The system according to claim 4, wherein the process is adapted to estimate the location of the signal source based on the distance values.

6. The system according to claim 3, wherein said processing unit is adapted to calculate a signal vector for each received signal.

7. The system according to claim 6, wherein said processing unit is adapted to perform a vector sum of the calculated vectors.

8. The system according to claim 7, wherein said processing unit is adapted to perform a conventional vector sum operation on a subset of the calculated vectors, the subset being composed of the largest vectors, and to perform a weighted sum operation on the signal vectors which are relatively smaller than the vectors in the subset.

9. The system according to claim 8, further comprising a display unit adapted to display the approximate coordinate set of the signal source.

10. The system according to claim 9, wherein the display unit is adapted to display a representation of a body and a pointer showing the approximate coordinate set of the signal source.

11. The system according to claim 1 wherein the antenna array comprises eight antenna elements.

13. The method according to claim 12, wherein each of at least two antenna elements is located near a point having a known coordinate set within a coordinate system centered in proximity of the body.

14. The method according to claim 13, further comprising the step of calculating a distance value associated with a received signal.

15. The method according to claim 14, further comprising the step of correlating the location of the signal source using the distance values associated with two or more antenna elements.

16. The method according to claim 13, further comprising the step of calculating a signal vector relating to each received signal.

17. The method according to claim 16, further comprising the step of performing a vector sum operation of the signal vectors.

18. The method according to claim 17, further comprising the step of applying a weighing factor to a signal vector.

19. The method according to claim 18, wherein the weighing factor is applied to signal vectors having a relatively small magnitude.

20. The method according to claim 19, further comprising the step of displaying the signal source'"'"'s estimated location.

21. The method according to claim 20, wherein the signal sources estimated location is displayed graphically as a pointer with a figure of a body.

22. The method according to claim 12 further comprising the step of localizing the signal source by receiving a signal at two or more antenna elements within the array.

12. A method for localizing an in vivo signal source with a wearable antenna array, said method comprising the steps of

receiving a signal at two or more antenna elements within the array;

measuring the received signal strength; and

correlating the signal strength measurements to an approximate coordinate set.