Microwave thermometry for microwave ablation systems

• US 9,743,986 B2
• Filed: 09/22/2015
• Issued: 08/29/2017
• Est. Priority Date: 06/22/2012
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Brannan, Joseph D.
• Primary Examiner(s): Ram, Jocelyn D
• Application Number:
  US14/861,313
• Publication Number:
  US 20160008069A1
• Time in Patent Office: 707 Days
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00642 with feedback, i.e. closed loop control
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00821 measured by a thermocouple
• CPC Class Codes: A61B 2018/00988 Means for storing information, e.g. calibration constants, or for preventing excessive use, e.g. usage, service life counter
• CPC Class Codes: A61B 2018/1823 Generators therefor
• CPC Class Codes: A61B 2018/183 characterised by the type of antenna
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves
• CPC Class Codes: G01J 5/0837 Microantennas, e.g. bow-tie
• CPC Class Codes: G01K 11/006 using measurement of the effect of a material on microwaves or longer electromagnetic waves, e.g. measuring temperature via microwaves emitted by the object G01K17/003, G01J5/00 take precedence; measuring the effect of a material on X-, gamma- or particle radiation G01K11/30
• CPC Class Codes: G01K 13/00 Thermometers specially adapted for specific purposes
• CPC Class Codes: G01K 7/02 using thermoelectric elements, e.g. thermocouples
• CPC Class Codes: H01R 13/66 Structural association with built-in electrical component coupling devices having concentrically or coaxially-arranged contacts H01R24/38

Abstract

A microwave ablation system incorporates a microwave thermometer that couples to a microwave transmission network connecting a microwave generator to a microwave applicator to measure noise temperature. The noise temperature is processed to separate out components of the noise temperature including the noise temperature of the tissue being treated and the noise temperature of the microwave transmission network. The noise temperature may be measured by a radiometer while the microwave generator is generating the microwave signal or during a period when the microwave signal is turned off. The microwave ablation system may be configured as a modular system having one or more thermometry network modules that are connectable between a microwave applicator and a microwave generator. Alternatively, the modular system includes a microwave generator, a microwave applicator, and a microwave cable that incorporate a microwave thermometry network module.

Claims

1. A microwave ablation system comprising:

a microwave generator configured to generate microwave energy;

a microwave applicator coupled to the microwave generator and configured to deliver the microwave energy to ablate tissue; and

a microwave thermometry module integrated into the microwave generator and having a connector configured to connect to another component of the microwave ablation system between the microwave generator and the microwave applicator, the microwave thermometry module including a radiometer configured to measure a noise temperature signal propagating from the microwave applicator to the microwave generator.

2. The microwave ablation system according to claim 1, wherein the microwave thermometry module includes a control interface circuit having a controller, a display driver coupled to the controller, and a display coupled to the display driver,

wherein the controller is in communication with the radiometer.

3. The microwave ablation system according to claim 1, further comprising a control interface module comprising a controller configured to communicate with the microwave thermometry module, a display driver coupled to the controller, and a display coupled to the display driver,

wherein the microwave generator includes a data connector, and wherein the control interface module includes a corresponding data connector configured to connect to the data connector of the microwave generator.

4. The microwave ablation system according to claim 1, further comprising a control interface module comprising a controller configured to communicate with the microwave thermometry module, a display driver coupled to the controller, and a display coupled to the display driver, the control interface module being integrated into the microwave generator.

5. The microwave ablation system according to claim 1, wherein the another component of the microwave ablation system is a coupling network.

6. A microwave ablation system comprising:

a microwave generator configured to generate microwave energy;

a microwave applicator including an antenna, a handle assembly coupled to the antenna, and a connector assembly coupled to the handle assembly, wherein the connector assembly is configured to connect to another component of the microwave ablation system between the microwave generator and the microwave applicator, and wherein the microwave applicator is coupled to the microwave generator and configured to deliver the microwave energy to ablate tissue; and

a microwave thermometry module integrated into the connector assembly, the microwave thermometry module including a radiometer configured to measure a noise temperature signal propagating from the microwave applicator to the microwave generator.

7. The microwave ablation system according to claim 6, wherein the microwave thermometry module includes a control interface circuit having a controller, a display driver coupled to the controller, and a display coupled to the display driver,

wherein the controller is in communication with the radiometer.

8. The microwave ablation system according to claim 6, further comprising a control interface module comprising a controller configured to communicate with the microwave thermometry module, a display driver coupled to the controller, and a display coupled to the display driver,

wherein the microwave generator includes a data connector, and wherein the control interface module includes a corresponding data connector configured to connect to the data connector of the microwave generator.

9. The microwave ablation system according to claim 6, further comprising a control interface module comprising a controller configured to communicate with the microwave thermometry module, a display driver coupled to the controller, and a display coupled to the display driver, the control interface module being integrated into the microwave generator.

10. The microwave ablation system according to claim 6, wherein the another component of the microwave ablation system is a coupling network.

11. A microwave ablation system comprising:

a microwave generator configured to generate microwave energy;

a microwave applicator coupled to the microwave generator and configured to deliver the microwave energy to ablate tissue;

a microwave cable having a first connector assembly and a second connector assembly, wherein the first connector assembly or the second connector assembly is configured to connect to another component of the microwave ablation system between the microwave generator and the microwave applicator; and

a microwave thermometry module integrated into the first connector assembly or the second connector assembly, the microwave thermometry module including a radiometer configured to measure a noise temperature signal propagating from the microwave applicator to the microwave generator.

12. The microwave ablation system according to claim 11, wherein the microwave cable is a reusable cable.

13. The microwave ablation system according to claim 11, wherein the microwave cable includes a circuit for storing device identification data and thermometry data.

14. The microwave ablation system according to claim 11, wherein the microwave thermometry module includes a control interface circuit having a controller, a display driver coupled to the controller, and a display coupled to the display driver,

wherein the controller is in communication with the radiometer.

15. The microwave ablation system according to claim 11, further comprising a control interface module comprising a controller configured to communicate with the microwave thermometry module, a display driver coupled to the controller, and a display coupled to the display driver,

wherein the microwave generator includes a data connector, and wherein the control interface module includes a corresponding data connector configured to connect to the data connector of the microwave generator.

16. The microwave ablation system according to claim 11, further comprising a control interface module comprising a controller configured to communicate with the microwave thermometry module, a display driver coupled to the controller, and a display coupled to the display driver, the control interface module being integrated into the microwave generator.

17. The microwave ablation system according to claim 11, wherein the another component of the microwave ablation system is a coupling network.