Methods, systems, and computer program products for providing dynamic data of positional localization of target implants

• US 20070161884A1
• Filed: 03/29/2004
• Published: 07/12/2007
• Est. Priority Date: 04/02/2003
• Status: Abandoned Application

• Current Assignee: VTQ IP Holding Corporation
• Original Assignee: Sicel Technologies, Inc.
• Inventors: Widener, Steven, Black, Robert, Mann, Gregory
• Application Number:
  US10/551,366
• Publication Number:
  US 20070161884A1
• Time in Patent Office: Days
• US Class Current: 600/407
• CPC Class Codes: A61B 2017/00022 Sensing or detecting at the treatment site
• CPC Class Codes: A61B 2017/00411 actuated by application of energy from an energy source outside the body
• CPC Class Codes: A61B 2034/107 Visualisation of planned trajectories or target regions
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2034/2072 Reference field transducer attached to an instrument or patient
• CPC Class Codes: A61B 2090/397 electromagnetic other than visible, e.g. microwave
• CPC Class Codes: A61B 2090/3975 active
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• 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 5/062 using magnetic field
• CPC Class Codes: A61B 90/37 Surgical systems with images on a monitor during operation
• CPC Class Codes: A61B 90/98 using electromagnetic means, e.g. transponders
• CPC Class Codes: A61N 2005/1051 using an active marker
• CPC Class Codes: A61N 5/1048 Monitoring, verifying, controlling systems and methods

Abstract

Systems for locating implanted in vivo sensors systems adapted for use with an external beam radiation therapy delivery source include: (a) an external solenoid member; (b) an articulated arm opertively associated with the external solenoid member, wherein, in operation, the articulated arm is configured to translate the solenoid; (c) a controller configured to direct the movement of the articulated arm, the controller being in communication with the power source configured to power the external solenoid; (d) at least one implantable sensors unit, wherein the at least one implantable sensor unit is configured to sense at least one predetermined parameter of interest in vivo, and wherein the at least one implantable sensor unit comprises a solenoid, and wherein, in operation, the sensor unit solenoid corporates with the external solenoid to generate a magnetic coupling signal having a signal strength that varies based on the possession of the external solenoid member relative to the implanted sensors unit; (e) a computer module in communication with the controller comprising computer programmed code that evaluates the coupling signal strength in relation to the position of the external solenoid and determines the position of the at least one sensor unit; and (f) an external reader configured to wirelessly communicate with the at least one implantable sensor unit to obtain data associated with the at least one predetermined parameter of interest.

Claims

1. A target locating and in vivo sensor system adapted for use with a therapy delivery and/or imaging source, comprising:

an external solenoid member;

a mechanism operably associated with the external solenoid member, wherein, in operation, the mechanism is configured to controllably move the solenoid external of a patient;

a controller configured to direct the movement of the mechanism, the controller being in communication with a power source configured to power the external solenoid;

at least one implantable wireless unit comprising a solenoid, wherein, in operation, the unit solenoid held internally in the patient cooperates with the external solenoid to generate a coupling signal having a signal strength that varies based on the position of the external solenoid member relative to the implanted unit; and

a computer module in communication with the controller comprising computer program code that evaluates the coupling signal strength in relation to the position of the external solenoid and determines the position of the at least one internally implanted unit.

2. A system according to claim 1, wherein the at least one implantable unit is a sensor configured to sense at least one predetermined parameter of interest in vivo, and an external reader configured to wirelessly communicate with the at least one implanted unit to obtain data associated with the at least one predetermined parameter of interest.

3. A system according to claim 1, wherein the mechanism comprises an articulated arm.

4. A system according to claim 2, wherein the external reader is configured to communicate with the implanted sensor unit using a bit encoded RF signal.

5. A system according to claim 1, wherein the at least one unit is configured to wirelessly relay an RF signal to the reader when implanted in tissue.

6. A system according to claim 1, wherein the external solenoid and the internal solenoid of the at least one sensor unit are configured to cooperate to generate a detectable coupling signal at a depth of up to at least about 14 cm.

7. A system according to claim 2, wherein the at least one sensor unit is a plurality of discrete sensor units.

8. A system according to claim 7, wherein the plurality of sensor units communicate with the external reader at the same frequency using unique bit encoded identifiers in the RF signal.

9. A system according to claim 8, wherein the plurality of sensors are configured to be individually polled by the external reader.

10. A system according to claim 1, wherein the at least one implanted sensor unit is chronically implanted for at least 1 week.

11. A system according to claim 2, wherein the at least one parameter comprises radiation dose.

12. A system according to claim 2, wherein the at least one parameter comprises temperature.

13. A system according to claim 2, wherein the controller is in communication with an external beam radiation therapy source.

14. A system according to claim 1, wherein the external solenoid and the at least one sensor unit solenoid are configured to generate a coupling signal that is detectable when the two solenoids are separated by at least about 14 cm.

15. A system according to claim 1, wherein the external solenoid generates a signal shape that varies with spatial and angular orientation with the internal solenoid of the sensor unit, and wherein said computer module comprises computer program code that receives the detected coupling signal strength and deconvolutes the signal shape with respect to position to determine the spatial location of the sensor in the subject.

16. A system according to claim 15, wherein the controller directs the mechanism to move the solenoid through a three dimensional pattern in free space to generate a corresponding response coupling signal, and wherein the computer module program code that evaluates the coupling signal strength uses the response signal generated by the three dimensional pattern to determine the position of the sensor unit.

17. A system according to claim 1, wherein the computer module further determines whether there is angular shift of the at least one sensor unit from an a priori position.

18. A system according to claim 1, wherein the articulated arm is configured to controllably move the solenoid in three dimensions.

19. A system according to claim 8, wherein the plurality of sensor units are configured to relay data regarding radiation dose and temperature to the reader.

20. A system according to claim 8, wherein the frequency is between about 100 kHz-1 MHz.

21. A system according to claim 2, wherein the computer module is configured to provide dynamic spatial data during delivery of a radiation therapy.

22. A system according to claim 21, wherein the controller and/or computer module is in communication with an external beam radiation therapy source to thereby guide and/or gate the administration of the radiation therapy during a radiation therapy session.

23. A method of obtaining spatial data and radiation dose data regarding a target in vivo treatment site, comprising:

implanting at least one sensor unit proximate and/or in a target treatment site of a patient;

sensing in vivo at least one predetermined parameter of interest using the implanted sensor unit;

wirelessly transmitting data associated with the sensed at least one parameter from the at least one sensor unit to an external reader;

providing an external coupling member located external of the patient proximate the target treatment site, the coupling member being configured to cooperate with the at least one implanted sensor to generate a coupling signal with a signal strength that varies in relation to the position of the coupling member with respect to the at least one sensor unit;

moving the coupling member;

detecting the signal strength of the coupling signal at a plurality of locations traveled based on the moving step; and

determining the position of the at least one sensor unit in the body based on the detecting step, thereby having the implanted sensor unit act as a positional marker and an in vivo sensor.

24-33. -33. (canceled)

34. A computer program product for obtaining spatial data regarding the position of at least one implanted sensor, the computer program product comprising:

computer readable storage medium having computer readable program code embodied in said medium, said computer-readable program code comprising;

computer readable program code for determining the spatial location of a selected one of the at least one implanted sensor units using input data associated with variation in signal strength of a coupling signal generated by an external solenoid and the at least one sensor unit over different known external positions of the external solenoid.

35-40. -40. (canceled)