# US 10,499,989 B2 · Narrow gauge high strength choked wet tip microwave ablation antenna

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,499,989 B2
- Document ID: US10499989B2
- Status: Granted
- Kind: B2
- Application number: 15/606,487
- Filed: 2017-05-26
- Published: 2017-09-21
- Granted: 2019-12-10
- Earliest claimed: 2009-05-27
- Assignees: Covidien LP
- Applicants: Covidien LP
- Inventors: Joseph D. Brannan; Kenlyn S. Bonn
- Web page: https://patentgrep.com/patent/US10499989B2

## CPC

- A61B 18/1815: {using microwaves}
- A61B 18/14: Probes or electrodes therefor
- A61B 18/18: by applying electromagnetic radiation, e.g. microwaves
- A61B 2018/00023: {closed, i.e. without wound contact by the fluid}
- A61B 2018/00577: {Ablation}
- A61B 2018/1823: {Generators therefor}
- A61B 2018/1869: {with an instrument interstitially inserted into the body, e.g. needles}
- Y10T 29/49117: Conductor or circuit manufacturing
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An electromagnetic surgical ablation probe having a coaxial feedline and cooling chamber is disclosed. The disclosed probe includes a dipole antenna arrangement having a radiating section, a distal tip coupled to a distal end of the radiating section, and a ring-like balun short, or choke, which may control a radiation pattern of the probe. A conductive tube disposed coaxially around the balun short includes at least one fluid conduit which provides coolant, such as dionized water, to a cooling chamber defined within the probe. A radiofrequency transparent catheter forms an outer surface of the probe and may include a lubricious coating.

## Claims

### Claim 1

An ablation probe, comprising:
a tubular shaft;
a coaxial feedline disposed within the tubular shaft, the coaxial feedline including an outer conductor;
a balun short disposed in electrical communication around the outer conductor, the balun short including at least one longitudinal notch defined therein; and
an inflow tube disposed longitudinally along the outer conductor and at least partially within the at least one longitudinal notch.

### Claim 2 (depends on 1)

The ablation probe according to claim 1, wherein the balun short is formed from a conductive material selected from the group consisting of a screen material, a mesh material, and a woven material.

### Claim 3 (depends on 1)

The ablation probe according to claim 1, wherein the balun short is formed from a conductive material selected from the group consisting of a metallic material and a polymeric material.

### Claim 4 (depends on 1)

The ablation probe according to claim 1, wherein the coaxial feedline further includes an inner conductor and the outer conductor is disposed coaxially about the inner conductor.

### Claim 5 (depends on 4)

The ablation probe according to claim 4, wherein the coaxial feedline further includes a dielectric disposed between the inner conductor and the outer conductor and the inner conductor and the dielectric extend beyond a distal end of the outer conductor.

### Claim 6 (depends on 5)

The ablation probe according to claim 5, further comprising a radiating section having a proximal portion operably coupled to a distal portion of the inner conductor.

### Claim 7

An ablation system, comprising:
a source of microwave ablation energy; and
an ablation probe including:
a tubular shaft;
a coaxial feedline disposed within the tubular shaft, the coaxial feedline coupled to the source of microwave ablation energy and including an outer conductor;
a balun short disposed in electrical communication around the outer conductor, the balun short including at least one longitudinal notch defined therein; and
an inflow tube disposed longitudinally along the outer conductor and at least partially within the at least one longitudinal notch.

### Claim 8 (depends on 7)

The ablation system according to claim 7, further comprising a plurality of rib members, wherein the balun short includes a plurality of additional longitudinal notches defined therein adapted to receive a corresponding rib member of the plurality of rib members.

### Claim 9 (depends on 8)

The ablation system according to claim 8, wherein the plurality of rib members divide the at least one fluid conduit into at least two longitudinal channels.

### Claim 10 (depends on 7)

The ablation system according to claim 7, wherein the balun short is formed from a conductive material selected from the group consisting of a screen material, a mesh material, and a woven material.

### Claim 11 (depends on 7)

The ablation system according to claim 7, wherein the balun short is formed from a conductive material selected from the group consisting of a metallic material and a polymeric material.

### Claim 12 (depends on 7)

The ablation system according to claim 7, wherein the coaxial feedline further includes an inner conductor and the outer conductor is disposed coaxially about the inner conductor.

### Claim 13 (depends on 12)

The ablation system according to claim 12, wherein the coaxial feedline further includes a dielectric disposed between the inner conductor and the outer conductor and the inner conductor and the dielectric extend beyond a distal end of the outer conductor.

### Claim 14 (depends on 13)

The ablation system according to claim 13, further comprising a radiating section having a proximal portion operably coupled to a distal portion of the inner conductor.