Apparatus, system and method for monitoring tissue during an electrosurgical procedure

• US 8,852,179 B2
• Filed: 10/10/2008
• Issued: 10/07/2014
• Est. Priority Date: 10/10/2008
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Ward, Arlen K., Ladtkow, Casey M.
• Primary Examiner(s): Schmidt, Emily
• Assistant Examiner(s): Anderson, Michael J
• Application Number:
  US12/249,263
• Publication Number:
  US 20100094271A1
• Time in Patent Office: 2,188 Days
• Field of Search: 606/34, 606/33, 606/41
• US Class Current: 606/33
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 2017/00039 Electric or electromagnetic phenomena other than conductivity, e.g. capacity, inductivity, Hall effect
• CPC Class Codes: A61B 2017/2945 Curved jaws
• CPC Class Codes: A61B 2018/1432 curved
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• 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 5/053 Measuring electrical impedance or conductance of a portion of the body

Abstract

A system for monitoring and/or controlling tissue modification during an electrosurgical procedure is provided. The system includes an electrosurgical apparatus adapted to connect to an electrosurgical generator. The electrosurgical apparatus configured to transmit energy to tissue. The system also includes a control system having one or more electromagnetic wave sources configured to generate the interrogator wave of one or more frequencies adjacent tissue. One or more sensors are configured to transmit and sense a reflected portion of the interrogator wave of at least one frequency to determine dielectric boundary data. A processor operatively coupled to the control system and to the electrosurgical generator configured to control the delivery of electrosurgical energy from the electrosurgical generator to tissue based on dielectric boundary data provided by the one or more sensors.

Claims

1. A system for monitoring and/or controlling tissue modification during an electrosurgical procedure comprising:

an electrosurgical apparatus adapted to connect to an electrosurgical generator, the electrosurgical apparatus configured to transmit energy to tissue;

a control system including;

at least one interrogator wave source configured to generate an interrogator wave of at least one frequency adjacent tissue;

a sensor configured to transmit the interrogator wave of at least one frequency and sense a reflected portion of the interrogator wave of at least one frequency; and

a processor operatively coupled to the control system and to the electrosurgical generator, the processor configured to determine a dielectric boundary data based on a phase shift between the interrogator wave of at least one frequency transmitted by the sensor and the reflected portion of the interrogator wave of at least one frequency sensed by the sensor, the processor configured to control the delivery of electrosurgical energy from the electrosurgical generator to tissue based on the dielectric boundary data determined by the processor.

2. The system according to claim 1, wherein the control system is configured to control the electrosurgical generator in real-time during the electrosurgical procedure.

3. The system according to claim 1, wherein the control system senses transformation of tissue and is configured to cooperate with the electrosurgical generator via the processor to control the delivery of electrosurgical energy to the tissue.

4. The system according to claim 1, wherein the electrosurgical apparatus includes a pair of jaw members configured to grasp tissue therebetween.

5. The system according to claim 4, wherein the sensor is located on of the pair of jaw members.

6. The system according to claim 5, wherein the sensor includes a smart sensor assembly.

7. The system according to claim 1, wherein the electrosurgical apparatus includes an active electrode in operative communication with a return electrode.

8. The system according to claim 1, wherein the information provided by the control system includes one of propagation velocity calculations and phase shift calculations of the reflected portion of the interrogator wave of at least one frequency.

9. The system according to claim 1, wherein the electrosurgical apparatus is operatively coupled to a coaxial cable in operative communication with the sensor and configured to transmit at least a portion of the interrogator wave of at least one frequency.

10. The system according to claim 1, wherein the control system includes a transceiver module configured to transmit at least a portion of the interrogator wave of at least one frequency.

11. The system according to claim 10, wherein the transceiver module uses clock signals received from a time source to perform at least some of the operations associated with the transceiver module.

12. The system according to claim 11, wherein transceiver module is configured for at least one of amplifying, filtering, and digitally sampling the reflected portion of the interrogator wave of at least one frequency.

13. The system according to claim 1, wherein the sensor is configured for continuous mode of operation.

14. The system according to claim 1, wherein the sensor is configured for real-time mode of operation.

15. The system according to claim 9, wherein the sensor is coupled to the at least one coaxial cable.

16. The system according to claim 9, wherein the sensor is integrally formed with the at least one coaxial cable.

17. The system according to claim 4, wherein at least one jaw member includes the sensor and includes at least one window operatively coupled to and aligned with the sensor.

18. A method for monitoring and/or controlling the delivery of electrosurgical energy to tissue during an electrosurgical procedure comprising the steps of:

providing an electrosurgical apparatus configured to apply energy to tissue;

transmitting through a sensor an interrogator wave of at least one frequency therethrough from an electromagnetic interrogator wave source;

directing at the sensor the interrogator wave of at least one frequency into tissue;

sensing a reflected portion of the interrogator wave of at least one frequency from the tissue with the sensor;

analyzing the sensed reflected portion of the interrogator wave of at least one frequency to determine a dielectric boundary data based on a phase shift between the interrogator wave of frequency and the sensed reflected portion of the interrogator wave of at least one frequency; and

controlling the delivery of electrosurgical energy from the electrosurgical generator to tissue based on the determined dielectric boundary data.

19. The method of claim 18, wherein the step of analyzing includes the step of calculating the maximum reflection coefficient of the interrogator wave of at least one frequency.

20. The method of claim 18, wherein the step of analyzing includes the step of calculating the propagation velocity of the at least a portion of the reflection of the interrogator wave.

21. The method of claim 18, wherein the step of controlling the delivery of electrical energy includes at least one of reducing, increasing and stopping electrosurgical energy delivery.

22. An apparatus for monitoring and/or controlling tissue modification during an electrosurgical procedure comprising:

an electrosurgical apparatus adapted to connect to an electrosurgical generator, the electrosurgical apparatus configured to apply energy to tissue;

at least one electromagnetic wave source configured to generate an interrogator wave of at least one frequency adjacent tissue and in operative communication with the electrosurgical generator and the electrosurgical apparatus;

a sensor configured to transmit the interrogator wave of at least one frequency and sense a reflected portion of the interrogator wave of at least one frequency; and

a processor operatively coupled to the electromagnetic wave source and to the electrosurgical generator, the processor configured to determine a dielectric boundary data based on a phase shift between the interrogator wave of at least one frequency transmitted by the sensor and the reflected portion of the interrogator wave of at least one frequency sensed by the sensor, the processor configured to control the delivery of electrosurgical energy from the electrosurgical generator to tissue based on the dielectric boundary data determined by the processor.