Microwave energy-delivery device and system

• US 9,161,814 B2
• Filed: 03/15/2013
• Issued: 10/20/2015
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Brannan, Joseph D., Ladtkow, Casey M., Peterson, Darion R., Larson, Eric W., Dickhans, William J., Willyard, Richard A., Case, Jason A.
• Primary Examiner(s): ANGWIN, DAVID PATRICK
• Application Number:
  US13/838,238
• Publication Number:
  US 20140259641A1
• Time in Patent Office: 949 Days
• Field of Search: 296/021, 606/33
• US Class Current: 1/1
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2018/00023 closed, i.e. without wound contact by the fluid
• CPC Class Codes: A61B 2018/00166 Multiple lumina
• CPC Class Codes: A61B 2018/00494 Stomach, intestines or bowel
• CPC Class Codes: A61B 2018/00511 Kidney
• CPC Class Codes: A61B 2018/00529 Liver
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00708 switching the power on or off
• CPC Class Codes: A61B 2018/00797 measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00821 measured by a thermocouple
• CPC Class Codes: A61B 2018/1861 with an instrument inserted into a body lumen or cavity, e.g. a catheter
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A method of manufacturing a microwave ablation device, the method including applying a balun short circumferentially about an outer conductor of a coaxial feedline and applying a dielectric material circumferentially about the outer conductor of the coaxial feedline and in contact with the balun short to form a balun. The method further including extending a temperature sensor along the coaxial feedline such that the sensor contacts the balun short, securing the temperature sensor to the coaxial feedline with a first heat shrink material, and securing the dielectric material, balun short, and temperature sensor in contact with each other and to the coaxial feedline using a second heat shrink material.

Claims

1. A method of manufacturing comprising:

providing a coaxial feedline including an inner conductor, an insulator circumscribing the inner conductor, and an outer conductor circumscribing the insulator;

applying a balun short circumferentially about the outer conductor of the coaxial feedline;

applying a dielectric material circumferentially about the outer conductor of the coaxial feedline and in contact with the balun short to form a balun;

extending a temperature sensor along the coaxial feedline such that the sensor contacts the balun short;

securing the temperature sensor to the coaxial feedline with a first heat shrink material;

securing the dielectric material, balun short, and temperature sensor in contact with each other and to the coaxial feedline using a second heat shrink material to make a microwave ablation device.

2. The method of claim 1, further comprising exposing a distal end of the dielectric material such that it is not covered with the second dielectric material.

3. The method of claim 1, further comprising applying an electrically conducting ink to the surface of the second heat shrink material facing the dielectric material and balun short.

4. The method of claim 1, further comprising removing a portion of the outer conductor of the coaxial feedline distal of the balun to expose a length of an insulator between the outer conductor and an inner conductor of the coaxial feedline and form a feedpoint.

5. The method of claim 4, wherein the portion of the outer conductor between the balun and the feed point forms a proximal radiating section.

6. The method of claim 1, further comprising removing a distal portion of the insulator between the inner and outer conductors to expose a distal portion of the inner conductor.

7. The method of claim 6, further comprising inserting the distal portion of the inner conductor into an electrically-conducting element, the electrically-conductive element forming a distal radiating section of the ablation device.

8. The method of claim 6, further comprising inserting a proximal end of the coaxial feedline into a transition, the transition connecting the coaxial feedline to a coaxial cable for connection to a microwave generator.

9. The method of claim 8, further comprising inserting the connected feedline into an inner tubular member, such that at least a portion of the distal radiating section extends beyond the distal end of the inner tubular member.

10. The method of claim 9, wherein a proximal portion of the inner tubular member is secured in a hub divider formed of an elastomeric material and having formed therein a substantially non elastic metal ring for securing the proximal portion of the inner tubular member within the hub divider.

11. The method of claim 10, further comprising inserting the connected feedline and inner tubular member into a hub, wherein the hub divider and the transition form there between a first chamber.

12. The method of claim 11, further comprising inserting an outer tubular member into a distal opening formed in a hub cap.

13. The method of claim 12, further comprising inserting the outer tubular member and hub cap over the inner tubular member in a co-luminal arrangement and into the hub forming a second chamber between the hub cap and hub divider.

14. The method of claim 13, further comprising placing the hub including inner and outer tubular members, feedline, and transition into a handle body.

15. The method of claim 14, wherein the handle body comprises two housing halves, which when brought together to form the handle body secure the hub including the inner tubular member, the outer tubular member, and transition into place using one or more alignment pins.